<#
.SYNOPSIS
    ROA2WEB - Unified Deployment & Management Console for Windows Server

.DESCRIPTION
    Interactive console for deploying and managing ROA2WEB application:
    - Deploy Backend + Frontend
    - Deploy Telegram Bot
    - Deploy all components
    - Start/Stop/Restart services
    - Check service status and health
    - Backup and rollback support

.PARAMETER NonInteractive
    Run in non-interactive mode with specific action

.PARAMETER Action
    Action to perform in non-interactive mode:
    - DeployBackend: Deploy Backend + Frontend
    - DeployTelegramBot: Deploy Telegram Bot only
    - DeployAll: Deploy all components
    - StartAll: Start all services
    - StopAll: Stop all services
    - RestartAll: Restart all services
    - Status: Show status

.EXAMPLE
    .\ROA2WEB-Console.ps1
    Launch interactive menu

.EXAMPLE
    .\ROA2WEB-Console.ps1 -NonInteractive -Action DeployAll
    Deploy all components without menu

.NOTES
    Author: ROA2WEB Team
    Version: 2.0 (Unified Console)
    Requires: Administrator privileges, PowerShell 5.1+
#>

[CmdletBinding()]
param(
    [switch]$NonInteractive,

    [ValidateSet("DeployBackend", "DeployTelegramBot", "DeployAll",
                 "StartAll", "StopAll", "RestartAll", "Status")]
    [string]$Action = ""
)

$ErrorActionPreference = "Stop"

# =============================================================================
# GLOBAL CONFIGURATION
# =============================================================================

# Auto-detect source path: if running from scripts/ subdirectory, use parent
$detectedSourcePath = if ((Split-Path $PSScriptRoot -Leaf) -eq "scripts") {
    Split-Path $PSScriptRoot -Parent
} else {
    $PSScriptRoot
}

$script:Config = @{
    # General
    InstallPath = "C:\inetpub\wwwroot\roa2web"
    SourcePath = $detectedSourcePath
    BackupPath = "C:\inetpub\wwwroot\roa2web\backups"

    # Backend
    BackendPath = "C:\inetpub\wwwroot\roa2web\backend"
    BackendServiceName = "ROA2WEB-Backend"
    BackendServiceDisplayName = "ROA2WEB Backend API"
    BackendServiceDescription = "FastAPI backend service for ROA2WEB application"
    BackendPort = 8000
    BackendHealthUrl = "http://localhost:8000/health"
    BackendHealthTimeout = 5

    # Frontend
    FrontendPath = "C:\inetpub\wwwroot\roa2web\frontend"

    # IIS Configuration
    IISSiteName = "Default Web Site"
    IISAppName = "roa2web"
    IISAppPoolName = "ROA2WEB-AppPool"

    # Telegram Bot
    TelegramBotPath = "C:\inetpub\wwwroot\roa2web\telegram-bot"
    TelegramBotServiceName = "ROA2WEB-TelegramBot"
    TelegramBotServiceDisplayName = "ROA2WEB Telegram Bot"
    TelegramBotServiceDescription = "Telegram bot frontend for ROA2WEB application"
    TelegramBotPort = 8002
    TelegramBotHealthUrl = "http://localhost:8002/internal/health"
    TelegramBotHealthTimeout = 10

    # Logs
    LogsPath = "C:\inetpub\wwwroot\roa2web\logs"
    TelegramBotLogsPath = "C:\inetpub\wwwroot\roa2web\telegram-bot\logs"

    # Timeouts
    ServiceTimeout = 30
}

# =============================================================================
# HELPER FUNCTIONS
# =============================================================================

function Write-Step {
    param([string]$Message)
    Write-Host "`n[*] $Message" -ForegroundColor Cyan
}

function Write-Success {
    param([string]$Message)
    Write-Host "    [OK] $Message" -ForegroundColor Green
}

function Write-Error {
    param([string]$Message)
    Write-Host "    [ERROR] $Message" -ForegroundColor Red
}

function Write-Warning {
    param([string]$Message)
    Write-Host "    [WARN] $Message" -ForegroundColor Yellow
}

function Write-Info {
    param([string]$Message)
    Write-Host "    [*] $Message" -ForegroundColor Yellow
}

function Test-Administrator {
    $currentUser = [Security.Principal.WindowsIdentity]::GetCurrent()
    $principal = New-Object Security.Principal.WindowsPrincipal($currentUser)
    return $principal.IsInRole([Security.Principal.WindowsBuiltInRole]::Administrator)
}

function Test-CommandExists {
    param([string]$Command)
    try {
        if (Get-Command $Command -ErrorAction Stop) {
            return $true
        }
    } catch {
        return $false
    }
}

# =============================================================================
# DETECTION FUNCTIONS - Check if first install or update needed
# =============================================================================

function Test-BackendInstalled {
    Write-Step "Checking if Backend is installed..."

    $venvPath = Join-Path $Config.BackendPath "venv"
    $venvExists = Test-Path $venvPath
    $service = Get-ServiceSafe -ServiceName $Config.BackendServiceName
    $serviceExists = $null -ne $service

    $requirementsPath = Join-Path $Config.BackendPath "requirements.txt"
    $hasRequirements = Test-Path $requirementsPath

    if ($venvExists -and $serviceExists -and $hasRequirements) {
        Write-Success "Backend is installed (venv + service exist)"
        return $true
    } else {
        Write-Warning "Backend NOT installed (missing: $(
            @(
                if (-not $venvExists) { 'venv' }
                if (-not $serviceExists) { 'service' }
                if (-not $hasRequirements) { 'requirements.txt' }
            ) -join ', '
        ))"
        return $false
    }
}

function Test-TelegramBotInstalled {
    Write-Step "Checking if Telegram Bot is installed..."

    $venvPath = Join-Path $Config.TelegramBotPath "venv"
    $venvExists = Test-Path $venvPath
    $service = Get-ServiceSafe -ServiceName $Config.TelegramBotServiceName
    $serviceExists = $null -ne $service

    $appPath = Join-Path $Config.TelegramBotPath "app"
    $hasApp = Test-Path $appPath

    if ($venvExists -and $serviceExists -and $hasApp) {
        Write-Success "Telegram Bot is installed (venv + service exist)"
        return $true
    } else {
        Write-Warning "Telegram Bot NOT installed (missing: $(
            @(
                if (-not $venvExists) { 'venv' }
                if (-not $serviceExists) { 'service' }
                if (-not $hasApp) { 'app files' }
            ) -join ', '
        ))"
        return $false
    }
}

function Get-ServiceSafe {
    param([string]$ServiceName)
    try {
        return Get-Service -Name $ServiceName -ErrorAction Stop
    } catch {
        return $null
    }
}

function Test-HealthEndpoint {
    param(
        [string]$Url,
        [int]$TimeoutSec
    )

    try {
        $response = Invoke-WebRequest -Uri $Url -UseBasicParsing -TimeoutSec $TimeoutSec -ErrorAction Stop

        if ($response.StatusCode -eq 200) {
            try {
                $content = $response.Content | ConvertFrom-Json
                return @{
                    Success = $true
                    Status = $content.status
                    Details = $content
                }
            } catch {
                return @{
                    Success = $true
                    Status = "healthy"
                    Details = $null
                }
            }
        }

        return @{
            Success = $false
            Status = "unhealthy"
            Details = $null
        }
    } catch {
        return @{
            Success = $false
            Status = "unreachable"
            Details = $null
            Error = $_.Exception.Message
        }
    }
}

function Wait-ForKeyPress {
    Write-Host "`nPress any key to continue..." -ForegroundColor Gray
    $null = $Host.UI.RawUI.ReadKey("NoEcho,IncludeKeyDown")
}

# =============================================================================
# PREREQUISITE INSTALLATION FUNCTIONS
# =============================================================================

function Install-Chocolatey {
    Write-Step "Checking Chocolatey package manager..."

    if (Test-CommandExists "choco") {
        Write-Success "Chocolatey already installed"
        return $true
    }

    Write-Info "Installing Chocolatey..."
    try {
        Set-ExecutionPolicy Bypass -Scope Process -Force
        [System.Net.ServicePointManager]::SecurityProtocol = [System.Net.ServicePointManager]::SecurityProtocol -bor 3072
        Invoke-Expression ((New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1'))

        # Refresh environment
        $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")

        Write-Success "Chocolatey installed successfully"
        return $true
    } catch {
        Write-Warning "Failed to install Chocolatey: $_"
        Write-Warning "Some automated installations may not be available"
        return $false
    }
}

function Install-Python {
    Write-Step "Checking Python installation..."

    # Check if Python is already installed
    try {
        $pythonCmd = Get-Command python -ErrorAction Stop
        $pythonVersionOutput = & python --version 2>&1
        if ($pythonVersionOutput -match "Python (\d+\.\d+\.\d+)") {
            $installedVersion = $matches[1]
            $versionParts = $installedVersion -split '\.'
            $major = [int]$versionParts[0]
            $minor = [int]$versionParts[1]

            if ($major -ge 3 -and $minor -ge 11) {
                Write-Success "Python $installedVersion already installed"
                return $true
            } else {
                Write-Warning "Python $installedVersion found, but 3.11+ required"
            }
        }
    } catch {
        Write-Info "Python not found, will attempt installation..."
    }

    # Try to install via Chocolatey
    if (Test-CommandExists "choco") {
        try {
            Write-Step "Installing Python 3.11..."
            choco install python --version=3.11.9 -y --force

            # Refresh environment
            $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")

            Write-Success "Python installed successfully"
            return $true
        } catch {
            Write-Error "Failed to install Python via Chocolatey: $_"
            return $false
        }
    } else {
        Write-Error "Chocolatey not available, cannot auto-install Python"
        Write-Warning "Please download Python manually from: https://www.python.org/downloads/"
        return $false
    }
}

function Install-NSSM {
    Write-Step "Checking NSSM (service manager)..."

    if (Test-Path "C:\nssm\nssm.exe") {
        Write-Success "NSSM already installed"
        return $true
    }

    # Try Chocolatey first
    if (Test-CommandExists "choco") {
        try {
            choco install nssm -y
            Write-Success "NSSM installed via Chocolatey"
            return $true
        } catch {
            Write-Warning "Chocolatey installation failed, trying direct download..."
        }
    }

    # Direct download fallback
    try {
        $nssmUrl = "https://nssm.cc/release/nssm-2.24.zip"
        $nssmZip = "$env:TEMP\nssm.zip"
        $nssmExtract = "$env:TEMP\nssm"

        Write-Step "Downloading NSSM..."
        Invoke-WebRequest -Uri $nssmUrl -OutFile $nssmZip

        Write-Step "Extracting NSSM..."
        Expand-Archive -Path $nssmZip -DestinationPath $nssmExtract -Force

        # Copy nssm.exe to C:\nssm
        New-Item -ItemType Directory -Path "C:\nssm" -Force | Out-Null
        Copy-Item -Path "$nssmExtract\nssm-2.24\win64\nssm.exe" -Destination "C:\nssm\nssm.exe" -Force

        # Add to PATH
        $currentPath = [Environment]::GetEnvironmentVariable("Path", "Machine")
        if ($currentPath -notlike "*C:\nssm*") {
            [Environment]::SetEnvironmentVariable("Path", "$currentPath;C:\nssm", "Machine")
            $env:Path += ";C:\nssm"
        }

        # Cleanup
        Remove-Item $nssmZip -Force
        Remove-Item $nssmExtract -Recurse -Force

        Write-Success "NSSM installed successfully"
        return $true
    } catch {
        Write-Error "Failed to install NSSM: $_"
        return $false
    }
}

function Install-IISModules {
    Write-Step "Checking IIS installation..."

    # Detect OS type (Server vs Desktop)
    $osInfo = Get-CimInstance -ClassName Win32_OperatingSystem
    $isServer = $osInfo.ProductType -eq 3

    # Check if IIS is installed
    $iisInstalled = $false

    if ($isServer) {
        $iisFeature = Get-WindowsFeature -Name Web-Server -ErrorAction SilentlyContinue
        $iisInstalled = $iisFeature -and $iisFeature.InstallState -eq "Installed"

        if (-not $iisInstalled) {
            Write-Warning "IIS not installed on Windows Server"
            Write-Host "    Install with: Install-WindowsFeature -Name Web-Server -IncludeManagementTools" -ForegroundColor Yellow
            return $false
        }
    } else {
        $iisFeature = Get-WindowsOptionalFeature -Online -FeatureName IIS-WebServer -ErrorAction SilentlyContinue
        $iisInstalled = $iisFeature -and $iisFeature.State -eq "Enabled"

        if (-not $iisInstalled) {
            Write-Warning "IIS not installed on Windows Desktop"
            Write-Host "    Enable via: Control Panel -> Windows Features -> Internet Information Services" -ForegroundColor Yellow
            return $false
        }
    }

    Write-Success "IIS is installed ($($osInfo.Caption))"

    # Install URL Rewrite Module
    Write-Step "Checking IIS URL Rewrite Module..."
    $urlRewriteInstalled = Get-WebConfiguration -Filter "/system.webServer/rewrite" -PSPath "IIS:\" -ErrorAction SilentlyContinue

    if (-not $urlRewriteInstalled) {
        try {
            Write-Info "Installing URL Rewrite Module..."
            $urlRewriteUrl = "https://download.microsoft.com/download/1/2/8/128E2E22-C1B9-44A4-BE2A-5859ED1D4592/rewrite_amd64_en-US.msi"
            $urlRewritePath = "$env:TEMP\rewrite_amd64.msi"

            Invoke-WebRequest -Uri $urlRewriteUrl -OutFile $urlRewritePath
            Start-Process msiexec.exe -ArgumentList "/i", $urlRewritePath, "/quiet", "/norestart" -Wait
            Remove-Item $urlRewritePath -Force

            Write-Success "URL Rewrite Module installed"
        } catch {
            Write-Warning "Failed to install URL Rewrite: $_"
            Write-Warning "Download manually from: https://www.iis.net/downloads/microsoft/url-rewrite"
        }
    } else {
        Write-Success "URL Rewrite Module already installed"
    }

    return $true
}

# =============================================================================
# FIRST-TIME INSTALLATION FUNCTIONS
# =============================================================================

function Install-BackendFirstTime {
    Write-Host "`n" + ("=" * 70) -ForegroundColor Yellow
    Write-Host "  FIRST-TIME INSTALLATION: BACKEND + FRONTEND" -ForegroundColor Yellow
    Write-Host ("=" * 70) -ForegroundColor Yellow

    try {
        # Install prerequisites
        Write-Step "Installing prerequisites..."
        Install-Chocolatey | Out-Null

        if (-not (Install-Python)) {
            throw "Python installation failed"
        }

        if (-not (Install-NSSM)) {
            throw "NSSM installation failed"
        }

        # Create directory structure
        Write-Step "Creating directory structure..."
        $directories = @(
            $Config.InstallPath,
            $Config.BackendPath,
            $Config.FrontendPath,
            $Config.LogsPath,
            (Join-Path $Config.BackendPath "logs"),
            (Join-Path $Config.BackendPath "temp")
        )

        foreach ($dir in $directories) {
            if (-not (Test-Path $dir)) {
                New-Item -ItemType Directory -Path $dir -Force | Out-Null
                Write-Success "Created: $dir"
            } else {
                Write-Success "Already exists: $dir"
            }
        }

        # Set permissions for IIS
        try {
            $acl = Get-Acl $Config.InstallPath
            $accessRule = New-Object System.Security.AccessControl.FileSystemAccessRule("IIS_IUSRS", "ReadAndExecute", "ContainerInherit,ObjectInherit", "None", "Allow")
            $acl.SetAccessRule($accessRule)
            Set-Acl -Path $Config.InstallPath -AclObject $acl
            Write-Success "Permissions set for IIS_IUSRS"
        } catch {
            Write-Warning "Could not set permissions: $_"
        }

        # Copy backend files from source
        Write-Step "Copying backend files..."
        $sourceBackend = Join-Path $Config.SourcePath "backend"

        if (-not (Test-Path $sourceBackend)) {
            throw "Source backend path not found: $sourceBackend"
        }

        # Copy backend files (exclude venv, __pycache__, .env)
        $excludeDirs = @("venv", "__pycache__", ".pytest_cache", "logs", "temp", "node_modules")
        $excludeFiles = @("*.pyc", "*.pyo", "*.log", ".env", ".env.local")

        Get-ChildItem -Path $sourceBackend -Recurse | ForEach-Object {
            $relativePath = $_.FullName.Substring($sourceBackend.Length).TrimStart('\', '/')

            # Check if excluded
            $inExcludedDir = $false
            foreach ($excludeDir in $excludeDirs) {
                if ($relativePath -match "^$excludeDir" -or $relativePath -match "[\\/]$excludeDir[\\/]") {
                    $inExcludedDir = $true
                    break
                }
            }
            if ($inExcludedDir) { return }

            $isExcludedFile = $false
            foreach ($pattern in $excludeFiles) {
                if ($_.Name -like $pattern) {
                    $isExcludedFile = $true
                    break
                }
            }
            if ($isExcludedFile) { return }

            $destPath = Join-Path $Config.BackendPath $relativePath

            if ($_.PSIsContainer) {
                if (-not (Test-Path $destPath)) {
                    New-Item -ItemType Directory -Path $destPath -Force | Out-Null
                }
            } else {
                $destDir = Split-Path $destPath -Parent
                if (-not (Test-Path $destDir)) {
                    New-Item -ItemType Directory -Path $destDir -Force | Out-Null
                }
                Copy-Item -Path $_.FullName -Destination $destPath -Force
            }
        }
        Write-Success "Backend files copied"

        # Copy .env.example
        $sourceEnvExample = Join-Path $sourceBackend ".env.example"
        if (Test-Path $sourceEnvExample) {
            $destEnvExample = Join-Path $Config.BackendPath ".env.example"
            Copy-Item -Path $sourceEnvExample -Destination $destEnvExample -Force
            Write-Success ".env.example template copied"
        }

        # Copy shared modules
        $sourceShared = Join-Path $Config.SourcePath "shared"
        if (Test-Path $sourceShared) {
            $destShared = Join-Path (Split-Path $Config.BackendPath -Parent) "shared"
            Copy-Item -Path $sourceShared -Destination $destShared -Recurse -Force -Exclude @("__pycache__", "*.pyc")
            Write-Success "Shared modules copied"
        }

        # Copy frontend files
        Write-Step "Copying frontend files..."
        $sourceFrontend = Join-Path $Config.SourcePath "frontend"

        if (Test-Path $sourceFrontend) {
            Copy-Item -Path "$sourceFrontend\*" -Destination $Config.FrontendPath -Recurse -Force
            Write-Success "Frontend files copied"
        } else {
            Write-Warning "Frontend source not found: $sourceFrontend"
        }

        # Create virtual environment
        Write-Step "Creating Python virtual environment..."
        $venvPath = Join-Path $Config.BackendPath "venv"
        & python -m venv $venvPath
        Write-Success "Virtual environment created at: $venvPath"

        # Define paths (BEFORE installing dependencies)
        $pipPath = Join-Path $venvPath "Scripts\pip.exe"
        $pythonPath = Join-Path $venvPath "Scripts\python.exe"
        $requirementsPath = Join-Path $Config.BackendPath "requirements.txt"

        # Install dependencies
        Write-Step "Installing Python dependencies..."

        if (Test-Path $requirementsPath) {
            Write-Info "Upgrading pip..."
            & $pythonPath -m pip install --upgrade pip | Out-Default

            Write-Info "Installing dependencies from requirements.txt..."
            & $pipPath install -r $requirementsPath | Out-Default
            Write-Success "Python dependencies installed"
        } else {
            Write-Warning "requirements.txt not found at: $requirementsPath"
        }

        # Create Windows Service
        Write-Step "Creating Windows Service for backend..."

        # Remove existing service if present
        $oldErrorAction = $ErrorActionPreference
        $ErrorActionPreference = "SilentlyContinue"
        $nssmOutput = & nssm status $Config.BackendServiceName 2>&1
        $serviceExists = $LASTEXITCODE -eq 0
        $ErrorActionPreference = $oldErrorAction

        if ($serviceExists) {
            Write-Info "Removing existing service..."
            & nssm stop $Config.BackendServiceName 2>&1 | Out-Null
            Start-Sleep -Seconds 2
            & nssm remove $Config.BackendServiceName confirm 2>&1 | Out-Null
            Start-Sleep -Seconds 2
        }

        # Create service with venv Python
        & nssm install $Config.BackendServiceName $pythonPath "-m" "uvicorn" "app.main:app" "--host" "127.0.0.1" "--port" $Config.BackendPort.ToString() "--workers" "4"
        & nssm set $Config.BackendServiceName DisplayName $Config.BackendServiceDisplayName
        & nssm set $Config.BackendServiceName Description $Config.BackendServiceDescription
        & nssm set $Config.BackendServiceName Start SERVICE_AUTO_START
        & nssm set $Config.BackendServiceName AppDirectory $Config.BackendPath

        # Set PYTHONPATH to shared directory for module imports
        $sharedPath = Join-Path $Config.InstallPath "shared"
        & nssm set $Config.BackendServiceName AppEnvironmentExtra "PYTHONPATH=$sharedPath"

        # Set logging
        $stdoutLog = Join-Path $Config.LogsPath "backend-stdout.log"
        $stderrLog = Join-Path $Config.LogsPath "backend-stderr.log"
        & nssm set $Config.BackendServiceName AppStdout $stdoutLog
        & nssm set $Config.BackendServiceName AppStderr $stderrLog
        & nssm set $Config.BackendServiceName AppStdoutCreationDisposition 4
        & nssm set $Config.BackendServiceName AppStderrCreationDisposition 4
        & nssm set $Config.BackendServiceName AppExit Default Restart
        & nssm set $Config.BackendServiceName AppRestartDelay 5000

        Write-Success "Windows Service created: $($Config.BackendServiceName)"

        # Configure IIS
        if (Install-IISModules) {
            Write-Step "Configuring IIS..."
            Import-Module WebAdministration -ErrorAction Stop

            # Create Application Pool
            if (Test-Path "IIS:\AppPools\$($Config.IISAppPoolName)") {
                Remove-WebAppPool -Name $Config.IISAppPoolName -ErrorAction SilentlyContinue
            }

            New-WebAppPool -Name $Config.IISAppPoolName -Force | Out-Null
            Set-ItemProperty -Path "IIS:\AppPools\$($Config.IISAppPoolName)" -Name "managedRuntimeVersion" -Value ""
            Write-Success "Application Pool created: $($Config.IISAppPoolName)"

            # Create/update application
            $existingApp = Get-WebApplication -Name $Config.IISAppName -Site $Config.IISSiteName -ErrorAction SilentlyContinue
            if ($existingApp) {
                Remove-WebApplication -Name $Config.IISAppName -Site $Config.IISSiteName -ErrorAction SilentlyContinue
            }

            New-WebApplication -Name $Config.IISAppName `
                -Site $Config.IISSiteName `
                -PhysicalPath $Config.FrontendPath `
                -ApplicationPool $Config.IISAppPoolName `
                -Force | Out-Null

            Write-Success "IIS Application created: /$($Config.IISAppName)"

            # Copy web.config
            $webConfigSource = Join-Path (Split-Path $Config.SourcePath -Parent) "config\web.config"
            $webConfigDest = Join-Path $Config.FrontendPath "web.config"
            if (Test-Path $webConfigSource) {
                Copy-Item -Path $webConfigSource -Destination $webConfigDest -Force
                Write-Success "web.config copied"
            }
        } else {
            Write-Warning "IIS modules not installed, skipping IIS configuration"
        }

        Write-Host "`n" + ("=" * 70) -ForegroundColor Green
        Write-Host "  BACKEND + FRONTEND INSTALLATION COMPLETED" -ForegroundColor Green
        Write-Host ("=" * 70) -ForegroundColor Green
        Write-Host "`nIMPORTANT: Configure .env file before starting service" -ForegroundColor Yellow
        Write-Host "Location: $($Config.BackendPath)\.env" -ForegroundColor Yellow

        return $true
    } catch {
        Write-Host "`n[INSTALLATION FAILED] $_" -ForegroundColor Red
        Write-Host $_.ScriptStackTrace -ForegroundColor Red
        return $false
    }
}

function Install-TelegramBotFirstTime {
    Write-Host "`n" + ("=" * 70) -ForegroundColor Yellow
    Write-Host "  FIRST-TIME INSTALLATION: TELEGRAM BOT" -ForegroundColor Yellow
    Write-Host ("=" * 70) -ForegroundColor Yellow

    try {
        # Install prerequisites
        Write-Step "Installing prerequisites..."
        Install-Chocolatey | Out-Null

        if (-not (Install-Python)) {
            throw "Python installation failed"
        }

        if (-not (Install-NSSM)) {
            throw "NSSM installation failed"
        }

        # Create directory structure
        Write-Step "Creating directory structure..."
        $directories = @(
            $Config.TelegramBotPath,
            (Join-Path $Config.TelegramBotPath "app"),
            (Join-Path $Config.TelegramBotPath "data"),
            $Config.TelegramBotLogsPath,
            (Join-Path $Config.TelegramBotPath "temp"),
            (Join-Path $Config.TelegramBotPath "backups")
        )

        foreach ($dir in $directories) {
            if (-not (Test-Path $dir)) {
                New-Item -ItemType Directory -Path $dir -Force | Out-Null
                Write-Success "Created: $dir"
            } else {
                Write-Success "Already exists: $dir"
            }
        }

        # Set permissions
        try {
            $acl = Get-Acl $Config.TelegramBotPath
            $systemRule = New-Object System.Security.AccessControl.FileSystemAccessRule("SYSTEM", "FullControl", "ContainerInherit,ObjectInherit", "None", "Allow")
            $acl.SetAccessRule($systemRule)
            Set-Acl -Path $Config.TelegramBotPath -AclObject $acl
            Write-Success "Permissions set for SYSTEM"
        } catch {
            Write-Warning "Could not set permissions: $_"
        }

        # Copy telegram bot files
        Write-Step "Copying Telegram bot files..."
        $sourceTelegramBot = Join-Path $Config.SourcePath "telegram-bot"

        if (-not (Test-Path $sourceTelegramBot)) {
            throw "Source telegram-bot path not found: $sourceTelegramBot"
        }

        # Copy app directory
        $sourceApp = Join-Path $sourceTelegramBot "app"
        $destApp = Join-Path $Config.TelegramBotPath "app"

        if (Test-Path $destApp) {
            Remove-Item -Path $destApp -Recurse -Force
        }

        Copy-Item -Path $sourceApp -Destination $destApp -Recurse -Force
        Write-Success "Application files copied"

        # Copy requirements.txt
        $sourceReq = Join-Path $sourceTelegramBot "requirements.txt"
        if (Test-Path $sourceReq) {
            $destReq = Join-Path $Config.TelegramBotPath "requirements.txt"
            Copy-Item -Path $sourceReq -Destination $destReq -Force
            Write-Success "requirements.txt copied"
        }

        # Copy .env.example
        $sourceEnvExample = Join-Path $sourceTelegramBot ".env.example"
        if (Test-Path $sourceEnvExample) {
            $destEnvExample = Join-Path $Config.TelegramBotPath ".env.example"
            Copy-Item -Path $sourceEnvExample -Destination $destEnvExample -Force
            Write-Success ".env.example template copied"
        }

        # Create virtual environment
        Write-Step "Creating Python virtual environment..."
        $venvPath = Join-Path $Config.TelegramBotPath "venv"
        & python -m venv $venvPath
        Write-Success "Virtual environment created"

        # Define paths (BEFORE installing dependencies)
        $pipPath = Join-Path $venvPath "Scripts\pip.exe"
        $pythonPath = Join-Path $venvPath "Scripts\python.exe"
        $requirementsPath = Join-Path $Config.TelegramBotPath "requirements.txt"

        # Install dependencies
        Write-Step "Installing Python dependencies..."

        if (Test-Path $requirementsPath) {
            Write-Info "Upgrading pip..."
            & $pythonPath -m pip install --upgrade pip | Out-Default

            Write-Info "Installing dependencies..."
            & $pipPath install -r $requirementsPath | Out-Default
            Write-Success "Python dependencies installed"
        }

        # Create Windows Service
        Write-Step "Creating Windows Service for Telegram bot..."

        # Remove existing service if present
        $oldErrorAction = $ErrorActionPreference
        $ErrorActionPreference = "SilentlyContinue"
        $nssmOutput = & nssm status $Config.TelegramBotServiceName 2>&1
        $serviceExists = $LASTEXITCODE -eq 0
        $ErrorActionPreference = $oldErrorAction

        if ($serviceExists) {
            Write-Info "Removing existing service..."
            & nssm stop $Config.TelegramBotServiceName 2>&1 | Out-Null
            Start-Sleep -Seconds 2
            & nssm remove $Config.TelegramBotServiceName confirm 2>&1 | Out-Null
            Start-Sleep -Seconds 2
        }

        # Create service
        & nssm install $Config.TelegramBotServiceName $pythonPath "-m" "app.main"
        & nssm set $Config.TelegramBotServiceName DisplayName $Config.TelegramBotServiceDisplayName
        & nssm set $Config.TelegramBotServiceName Description $Config.TelegramBotServiceDescription
        & nssm set $Config.TelegramBotServiceName Start SERVICE_AUTO_START
        & nssm set $Config.TelegramBotServiceName AppDirectory $Config.TelegramBotPath
        & nssm set $Config.TelegramBotServiceName AppEnvironmentExtra "PYTHONPATH=$($Config.TelegramBotPath)"

        # Set logging
        $stdoutLog = Join-Path $Config.TelegramBotLogsPath "stdout.log"
        $stderrLog = Join-Path $Config.TelegramBotLogsPath "stderr.log"
        & nssm set $Config.TelegramBotServiceName AppStdout $stdoutLog
        & nssm set $Config.TelegramBotServiceName AppStderr $stderrLog
        & nssm set $Config.TelegramBotServiceName AppStdoutCreationDisposition 4
        & nssm set $Config.TelegramBotServiceName AppStderrCreationDisposition 4
        & nssm set $Config.TelegramBotServiceName AppExit Default Restart
        & nssm set $Config.TelegramBotServiceName AppRestartDelay 5000

        Write-Success "Windows Service created: $($Config.TelegramBotServiceName)"

        Write-Host "`n" + ("=" * 70) -ForegroundColor Green
        Write-Host "  TELEGRAM BOT INSTALLATION COMPLETED" -ForegroundColor Green
        Write-Host ("=" * 70) -ForegroundColor Green
        Write-Host "`nIMPORTANT: Configure .env file before starting service" -ForegroundColor Yellow
        Write-Host "Location: $($Config.TelegramBotPath)\.env" -ForegroundColor Yellow

        return $true
    } catch {
        Write-Host "`n[INSTALLATION FAILED] $_" -ForegroundColor Red
        Write-Host $_.ScriptStackTrace -ForegroundColor Red
        return $false
    }
}

# =============================================================================
# MENU FUNCTIONS
# =============================================================================

function Show-MainMenu {
    Clear-Host
    Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
    Write-Host "  ROA2WEB - Unified Deployment & Management Console" -ForegroundColor Cyan
    Write-Host ("=" * 70) -ForegroundColor Cyan
    Write-Host ""
    Write-Host "  Main Menu:" -ForegroundColor Yellow
    Write-Host ""
    Write-Host "  [1] Deploy Components" -ForegroundColor White
    Write-Host "      (Update application files and configurations)" -ForegroundColor Gray
    Write-Host ""
    Write-Host "  [2] Manage Services" -ForegroundColor White
    Write-Host "      (Start, stop, restart Backend and Telegram Bot)" -ForegroundColor Gray
    Write-Host ""
    Write-Host "  [3] Check Status" -ForegroundColor White
    Write-Host "      (View service status and health checks)" -ForegroundColor Gray
    Write-Host ""
    Write-Host "  [Q] Quit" -ForegroundColor Red
    Write-Host ""
    Write-Host ("=" * 70) -ForegroundColor Cyan

    do {
        Write-Host "`nYour choice: " -ForegroundColor Yellow -NoNewline
        $choice = Read-Host

        switch ($choice.ToUpper()) {
            "1" { return "Deploy" }
            "2" { return "Manage" }
            "3" { return "Status" }
            "Q" { return "Quit" }
            default {
                Write-Host "Invalid choice. Please select 1-3 or Q." -ForegroundColor Red
            }
        }
    } while ($true)
}

function Show-DeployMenu {
    Clear-Host
    Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
    Write-Host "  Deploy Components" -ForegroundColor Cyan
    Write-Host ("=" * 70) -ForegroundColor Cyan
    Write-Host ""
    Write-Host "  Select what to deploy:" -ForegroundColor Yellow
    Write-Host ""
    Write-Host "  [1] Backend + Frontend" -ForegroundColor White
    Write-Host "      (FastAPI backend + Vue.js frontend files)" -ForegroundColor Gray
    Write-Host ""
    Write-Host "  [2] Telegram Bot" -ForegroundColor White
    Write-Host "      (Telegram bot application only)" -ForegroundColor Gray
    Write-Host ""
    Write-Host "  [3] All Components" -ForegroundColor White
    Write-Host "      (Backend + Frontend + Telegram Bot)" -ForegroundColor Gray
    Write-Host ""
    Write-Host "  [B] Back to Main Menu" -ForegroundColor Yellow
    Write-Host ""
    Write-Host ("=" * 70) -ForegroundColor Cyan

    do {
        Write-Host "`nYour choice: " -ForegroundColor Yellow -NoNewline
        $choice = Read-Host

        switch ($choice.ToUpper()) {
            "1" { return "Backend" }
            "2" { return "TelegramBot" }
            "3" { return "All" }
            "B" { return "Back" }
            default {
                Write-Host "Invalid choice. Please select 1-3 or B." -ForegroundColor Red
            }
        }
    } while ($true)
}

function Show-ManageMenu {
    Clear-Host
    Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
    Write-Host "  Manage Services" -ForegroundColor Cyan
    Write-Host ("=" * 70) -ForegroundColor Cyan
    Write-Host ""
    Write-Host "  Quick Actions:" -ForegroundColor Yellow
    Write-Host "  [1] Start All Services" -ForegroundColor Green
    Write-Host "  [2] Stop All Services" -ForegroundColor Red
    Write-Host "  [3] Restart All Services" -ForegroundColor Yellow
    Write-Host ""
    Write-Host "  Backend Service:" -ForegroundColor Yellow
    Write-Host "  [4] Start Backend" -ForegroundColor Green
    Write-Host "  [5] Stop Backend" -ForegroundColor Red
    Write-Host "  [6] Restart Backend" -ForegroundColor Yellow
    Write-Host ""
    Write-Host "  Telegram Bot Service:" -ForegroundColor Yellow
    Write-Host "  [7] Start Telegram Bot" -ForegroundColor Green
    Write-Host "  [8] Stop Telegram Bot" -ForegroundColor Red
    Write-Host "  [9] Restart Telegram Bot" -ForegroundColor Yellow
    Write-Host ""
    Write-Host "  [B] Back to Main Menu" -ForegroundColor Gray
    Write-Host ""
    Write-Host ("=" * 70) -ForegroundColor Cyan

    do {
        Write-Host "`nYour choice: " -ForegroundColor Yellow -NoNewline
        $choice = Read-Host

        switch ($choice.ToUpper()) {
            "1" { return @{ Action = "Start"; Component = "All" } }
            "2" { return @{ Action = "Stop"; Component = "All" } }
            "3" { return @{ Action = "Restart"; Component = "All" } }
            "4" { return @{ Action = "Start"; Component = "Backend" } }
            "5" { return @{ Action = "Stop"; Component = "Backend" } }
            "6" { return @{ Action = "Restart"; Component = "Backend" } }
            "7" { return @{ Action = "Start"; Component = "TelegramBot" } }
            "8" { return @{ Action = "Stop"; Component = "TelegramBot" } }
            "9" { return @{ Action = "Restart"; Component = "TelegramBot" } }
            "B" { return @{ Action = "Back"; Component = "" } }
            default {
                Write-Host "Invalid choice. Please select 1-9 or B." -ForegroundColor Red
            }
        }
    } while ($true)
}

# =============================================================================
# SERVICE MANAGEMENT FUNCTIONS
# =============================================================================

function Start-ServiceComponent {
    param(
        [string]$ComponentName,
        [string]$ServiceName,
        [string]$HealthUrl,
        [int]$HealthTimeout
    )

    Write-Step "Starting $ComponentName..."

    $service = Get-ServiceSafe -ServiceName $ServiceName

    if (-not $service) {
        Write-Error "Service '$ServiceName' not found"
        Write-Warning "Run Install script first to create the service"
        return $false
    }

    if ($service.Status -eq "Running") {
        Write-Success "Service is already running"
        return $true
    }

    try {
        Start-Service -Name $ServiceName
        Write-Info "Service start command issued"

        $elapsed = 0
        while ($service.Status -ne "Running" -and $elapsed -lt $Config.ServiceTimeout) {
            Start-Sleep -Seconds 1
            $service.Refresh()
            $elapsed++
            if ($elapsed % 5 -eq 0) {
                Write-Info "Waiting for service to start... ($elapsed/$($Config.ServiceTimeout))"
            }
        }

        if ($service.Status -eq "Running") {
            Write-Success "Service started successfully"

            # Wait for initialization
            $waitTime = if ($ComponentName -eq "Telegram Bot") { 5 } else { 3 }
            Start-Sleep -Seconds $waitTime

            # Test health endpoint
            $health = Test-HealthEndpoint -Url $HealthUrl -TimeoutSec $HealthTimeout

            if ($health.Success) {
                Write-Success "Health check passed: $($health.Status)"
            } else {
                Write-Warning "Health check failed: $($health.Status) (service may still be starting)"
            }

            return $true
        } else {
            Write-Error "Service failed to start (Status: $($service.Status))"
            return $false
        }
    } catch {
        Write-Error "Failed to start service: $_"
        return $false
    }
}

function Stop-ServiceComponent {
    param(
        [string]$ComponentName,
        [string]$ServiceName
    )

    Write-Step "Stopping $ComponentName..."

    $service = Get-ServiceSafe -ServiceName $ServiceName

    if (-not $service) {
        Write-Error "Service '$ServiceName' not found"
        return $false
    }

    if ($service.Status -eq "Stopped") {
        Write-Success "Service is already stopped"
        return $true
    }

    try {
        Stop-Service -Name $ServiceName -Force
        Write-Info "Service stop command issued"

        $elapsed = 0
        while ($service.Status -ne "Stopped" -and $elapsed -lt $Config.ServiceTimeout) {
            Start-Sleep -Seconds 1
            $service.Refresh()
            $elapsed++
            if ($elapsed % 5 -eq 0) {
                Write-Info "Waiting for service to stop... ($elapsed/$($Config.ServiceTimeout))"
            }
        }

        if ($service.Status -eq "Stopped") {
            Write-Success "Service stopped successfully"
            return $true
        } else {
            Write-Error "Service did not stop within timeout (Status: $($service.Status))"
            return $false
        }
    } catch {
        Write-Error "Failed to stop service: $_"
        return $false
    }
}

function Restart-ServiceComponent {
    param(
        [string]$ComponentName,
        [string]$ServiceName,
        [string]$HealthUrl,
        [int]$HealthTimeout
    )

    Write-Step "Restarting $ComponentName..."

    $stopResult = Stop-ServiceComponent -ComponentName $ComponentName -ServiceName $ServiceName

    if (-not $stopResult) {
        Write-Error "Failed to stop service, aborting restart"
        return $false
    }

    Start-Sleep -Seconds 2

    $startResult = Start-ServiceComponent -ComponentName $ComponentName -ServiceName $ServiceName -HealthUrl $HealthUrl -HealthTimeout $HealthTimeout

    if ($startResult) {
        Write-Success "Service restarted successfully"
        return $true
    } else {
        Write-Error "Failed to start service after stop"
        return $false
    }
}

function Show-ServiceStatus {
    param(
        [string]$ComponentName,
        [string]$ServiceName,
        [string]$HealthUrl,
        [int]$HealthTimeout
    )

    $service = Get-ServiceSafe -ServiceName $ServiceName

    Write-Host "`n${ComponentName}:" -ForegroundColor Cyan
    Write-Host "  Service Name:  $ServiceName" -ForegroundColor Gray

    if ($service) {
        $statusColor = switch ($service.Status) {
            "Running" { "Green" }
            "Stopped" { "Yellow" }
            default { "Gray" }
        }
        Write-Host "  Status:        $($service.Status)" -ForegroundColor $statusColor
        Write-Host "  Start Type:    $($service.StartType)" -ForegroundColor Gray

        if ($service.Status -eq "Running") {
            $health = Test-HealthEndpoint -Url $HealthUrl -TimeoutSec $HealthTimeout
            $healthColor = switch ($health.Status) {
                "healthy" { "Green" }
                "ok" { "Green" }
                "unhealthy" { "Red" }
                "unreachable" { "Yellow" }
                default { "Gray" }
            }
            Write-Host "  Health:        $($health.Status)" -ForegroundColor $healthColor
        }
    } else {
        Write-Host "  Status:        Not Installed" -ForegroundColor Red
    }
}

# =============================================================================
# BACKUP FUNCTIONS
# =============================================================================

function New-BackupDirectory {
    if (-not (Test-Path $Config.BackupPath)) {
        New-Item -ItemType Directory -Path $Config.BackupPath -Force | Out-Null
    }
}

function Backup-CurrentDeployment {
    param(
        [string]$Component  # "Backend", "TelegramBot", or "All"
    )

    Write-Step "Creating backup of current deployment..."

    New-BackupDirectory

    $timestamp = Get-Date -Format "yyyyMMdd-HHmmss"
    $backupName = "backup-$Component-$timestamp"
    $backupFullPath = Join-Path $Config.BackupPath $backupName

    try {
        New-Item -ItemType Directory -Path $backupFullPath -Force | Out-Null

        switch ($Component) {
            "Backend" {
                # Backup backend
                if (Test-Path $Config.BackendPath) {
                    $backupBackendPath = Join-Path $backupFullPath "backend"
                    Copy-Item -Path $Config.BackendPath -Destination $backupBackendPath -Recurse -Force -ErrorAction SilentlyContinue
                    Write-Success "Backend backed up"
                }

                # Backup frontend
                if (Test-Path $Config.FrontendPath) {
                    $backupFrontendPath = Join-Path $backupFullPath "frontend"
                    Copy-Item -Path $Config.FrontendPath -Destination $backupFrontendPath -Recurse -Force -ErrorAction SilentlyContinue
                    Write-Success "Frontend backed up"
                }
            }

            "TelegramBot" {
                # Backup app directory
                $appPath = Join-Path $Config.TelegramBotPath "app"
                if (Test-Path $appPath) {
                    $backupAppPath = Join-Path $backupFullPath "app"
                    Copy-Item -Path $appPath -Destination $backupAppPath -Recurse -Force
                    Write-Success "App files backed up"
                }

                # Backup requirements.txt
                $reqFile = Join-Path $Config.TelegramBotPath "requirements.txt"
                if (Test-Path $reqFile) {
                    Copy-Item -Path $reqFile -Destination (Join-Path $backupFullPath "requirements.txt") -Force
                    Write-Success "Requirements file backed up"
                }

                # Backup .env
                $envFile = Join-Path $Config.TelegramBotPath ".env"
                if (Test-Path $envFile) {
                    Copy-Item -Path $envFile -Destination (Join-Path $backupFullPath ".env") -Force
                    Write-Success ".env file backed up"
                }

                # Backup database
                $dbFile = Join-Path $Config.TelegramBotPath "data\telegram_bot.db"
                if (Test-Path $dbFile) {
                    $backupDataPath = Join-Path $backupFullPath "data"
                    New-Item -ItemType Directory -Path $backupDataPath -Force | Out-Null
                    Copy-Item -Path $dbFile -Destination (Join-Path $backupDataPath "telegram_bot.db") -Force
                    Write-Success "Database backed up"
                }
            }

            "All" {
                # Backup both
                Backup-CurrentDeployment -Component "Backend"
                Backup-CurrentDeployment -Component "TelegramBot"
                return $backupFullPath
            }
        }

        Write-Success "Backup created at: $backupFullPath"

        # Clean old backups (keep last 10)
        $allBackups = Get-ChildItem -Path $Config.BackupPath -Directory |
                      Where-Object { $_.Name -like "backup-*" } |
                      Sort-Object Name -Descending

        if ($allBackups.Count -gt 10) {
            $oldBackups = $allBackups | Select-Object -Skip 10
            foreach ($oldBackup in $oldBackups) {
                Remove-Item -Path $oldBackup.FullName -Recurse -Force
                Write-Success "Cleaned old backup: $($oldBackup.Name)"
            }
        }

        return $backupFullPath
    } catch {
        Write-Error "Backup failed: $_"
        throw
    }
}

# =============================================================================
# DEPLOYMENT FUNCTIONS
# =============================================================================

function Update-BackendFiles {
    Write-Step "Updating backend files..."

    $sourceBackend = Join-Path $Config.SourcePath "backend"

    if (-not (Test-Path $sourceBackend)) {
        throw "Source backend path not found: $sourceBackend"
    }

    try {
        # Copy files except .env and logs
        $excludeFiles = @("*.env", "*.log", "*.pyc", "__pycache__")

        Get-ChildItem -Path $sourceBackend -Recurse -File | ForEach-Object {
            $relativePath = $_.FullName.Substring($sourceBackend.Length)
            $destPath = Join-Path $Config.BackendPath $relativePath

            $skip = $false
            foreach ($pattern in $excludeFiles) {
                if ($_.Name -like $pattern -or $_.Directory.Name -eq "__pycache__") {
                    $skip = $true
                    break
                }
            }

            if (-not $skip) {
                $destDir = Split-Path $destPath -Parent
                if (-not (Test-Path $destDir)) {
                    New-Item -ItemType Directory -Path $destDir -Force | Out-Null
                }
                Copy-Item -Path $_.FullName -Destination $destPath -Force
            }
        }

        Write-Success "Backend files updated"

        # Copy .env.example explicitly (excluded from recursive copy)
        $sourceEnvExample = Join-Path $sourceBackend ".env.example"
        $destEnvExample = Join-Path $Config.BackendPath ".env.example"
        if (Test-Path $sourceEnvExample) {
            Copy-Item -Path $sourceEnvExample -Destination $destEnvExample -Force
            Write-Success ".env.example template updated"
        }

        # Check if requirements.txt changed
        $sourceReq = Join-Path $sourceBackend "requirements.txt"
        $destReq = Join-Path $Config.BackendPath "requirements.txt"

        if (Test-Path $sourceReq) {
            $sourceHash = (Get-FileHash $sourceReq).Hash
            $destHash = if (Test-Path $destReq) { (Get-FileHash $destReq).Hash } else { "" }

            if ($sourceHash -ne $destHash) {
                Write-Step "Requirements changed, updating Python dependencies..."
                Copy-Item -Path $sourceReq -Destination $destReq -Force

                # Use virtual environment pip (same pattern as Telegram Bot)
                $venvPath = Join-Path $Config.BackendPath "venv"
                $pipPath = Join-Path $venvPath "Scripts\pip.exe"

                if (Test-Path $pipPath) {
                    & $pipPath install -r $destReq --upgrade
                    if ($LASTEXITCODE -eq 0) {
                        Write-Success "Python dependencies updated"
                    } else {
                        throw "pip install failed with exit code: $LASTEXITCODE"
                    }
                } else {
                    Write-Warning "Virtual environment not found at: $venvPath"
                    Write-Warning "Run Install-ROA2WEB.ps1 first to create virtual environment"
                    throw "Backend virtual environment not found"
                }
            } else {
                Write-Success "Python dependencies unchanged"
            }
        }
    } catch {
        Write-Error "Failed to update backend files: $_"
        throw
    }
}

function Update-FrontendFiles {
    Write-Step "Updating frontend files..."

    $sourceFrontend = Join-Path $Config.SourcePath "frontend"

    if (-not (Test-Path $sourceFrontend)) {
        throw "Source frontend path not found: $sourceFrontend"
    }

    try {
        # Remove old frontend files (except web.config)
        if (Test-Path $Config.FrontendPath) {
            Get-ChildItem -Path $Config.FrontendPath -Exclude "web.config" | Remove-Item -Recurse -Force -ErrorAction SilentlyContinue
        }

        # Copy new frontend files
        Copy-Item -Path "$sourceFrontend\*" -Destination $Config.FrontendPath -Recurse -Force

        Write-Success "Frontend files updated"
    } catch {
        Write-Error "Failed to update frontend files: $_"
        throw
    }
}

function Update-TelegramBotFiles {
    Write-Step "Updating Telegram bot files..."

    $sourceApp = Join-Path $Config.SourcePath "app"

    if (-not (Test-Path $sourceApp)) {
        throw "Source app directory not found: $sourceApp"
    }

    try {
        # Remove old app directory
        $destApp = Join-Path $Config.TelegramBotPath "app"
        if (Test-Path $destApp) {
            Remove-Item -Path $destApp -Recurse -Force
            Write-Success "Removed old app directory"
        }

        # Copy new app files
        Copy-Item -Path $sourceApp -Destination $destApp -Recurse -Force
        Write-Success "Application files updated"

        # Update requirements.txt if changed
        $sourceReq = Join-Path $Config.SourcePath "requirements.txt"
        $destReq = Join-Path $Config.TelegramBotPath "requirements.txt"

        if (Test-Path $sourceReq) {
            $sourceHash = (Get-FileHash $sourceReq -Algorithm SHA256).Hash
            $destHash = if (Test-Path $destReq) {
                (Get-FileHash $destReq -Algorithm SHA256).Hash
            } else {
                ""
            }

            if ($sourceHash -ne $destHash) {
                Write-Step "Requirements changed, updating Python dependencies..."
                Copy-Item -Path $sourceReq -Destination $destReq -Force

                # Use virtual environment pip
                $venvPath = Join-Path $Config.TelegramBotPath "venv"
                $pipPath = Join-Path $venvPath "Scripts\pip.exe"

                if (Test-Path $pipPath) {
                    & $pipPath install -r $destReq --upgrade
                    Write-Success "Python dependencies updated"
                } else {
                    Write-Warning "Virtual environment not found, skipping dependency update"
                }
            } else {
                Write-Success "Python dependencies unchanged"
            }
        }

        # Copy .env.example template (always update to keep in sync)
        $sourceEnvExample = Join-Path $Config.SourcePath ".env.example"
        $destEnvExample = Join-Path $Config.TelegramBotPath ".env.example"
        if (Test-Path $sourceEnvExample) {
            Copy-Item -Path $sourceEnvExample -Destination $destEnvExample -Force
            Write-Success ".env.example template updated"
        }

        # Preserve .env file (or create from .env.example if missing)
        $envFile = Join-Path $Config.TelegramBotPath ".env"
        if (-not (Test-Path $envFile)) {
            if (Test-Path $sourceEnvExample) {
                Copy-Item -Path $sourceEnvExample -Destination $envFile -Force
                Write-Warning "Created .env from .env.example - PLEASE CONFIGURE"
            }
        } else {
            Write-Success ".env file preserved"
        }

    } catch {
        Write-Error "Failed to update Telegram bot files: $_"
        throw
    }
}

function Deploy-Backend {
    Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
    Write-Host "  DEPLOYING BACKEND + FRONTEND" -ForegroundColor Cyan
    Write-Host ("=" * 70) -ForegroundColor Cyan

    try {
        # Auto-detect: First-time install or update?
        $isInstalled = Test-BackendInstalled

        if (-not $isInstalled) {
            Write-Host ""
            Write-Warning "Backend NOT detected - performing FIRST-TIME INSTALLATION"
            Write-Host ""
            Start-Sleep -Seconds 2

            # Route to first-time installation
            return Install-BackendFirstTime
        }

        # Backend is already installed - proceed with UPDATE
        Write-Host ""
        Write-Info "Backend detected - performing UPDATE"
        Write-Host ""

        # Create backup
        $backupPath = Backup-CurrentDeployment -Component "Backend"

        # Stop backend service
        $stopped = Stop-ServiceComponent -ComponentName "Backend" -ServiceName $Config.BackendServiceName
        if (-not $stopped) {
            throw "Failed to stop backend service"
        }

        # Update files
        Update-BackendFiles
        Update-FrontendFiles

        # Start backend service
        $started = Start-ServiceComponent -ComponentName "Backend" `
                                         -ServiceName $Config.BackendServiceName `
                                         -HealthUrl $Config.BackendHealthUrl `
                                         -HealthTimeout $Config.BackendHealthTimeout

        if ($started) {
            Write-Host "`n" + ("=" * 70) -ForegroundColor Green
            Write-Host "  BACKEND + FRONTEND DEPLOYED SUCCESSFULLY" -ForegroundColor Green
            Write-Host ("=" * 70) -ForegroundColor Green
            Write-Host "  Backup: $backupPath" -ForegroundColor Gray
            return $true
        } else {
            throw "Failed to start backend service after deployment"
        }

    } catch {
        Write-Host "`n[DEPLOYMENT FAILED] $_" -ForegroundColor Red
        return $false
    }
}

function Deploy-TelegramBot {
    Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
    Write-Host "  DEPLOYING TELEGRAM BOT" -ForegroundColor Cyan
    Write-Host ("=" * 70) -ForegroundColor Cyan

    try {
        # Auto-detect: First-time install or update?
        $isInstalled = Test-TelegramBotInstalled

        if (-not $isInstalled) {
            Write-Host ""
            Write-Warning "Telegram Bot NOT detected - performing FIRST-TIME INSTALLATION"
            Write-Host ""
            Start-Sleep -Seconds 2

            # Route to first-time installation
            return Install-TelegramBotFirstTime
        }

        # Telegram Bot is already installed - proceed with UPDATE
        Write-Host ""
        Write-Info "Telegram Bot detected - performing UPDATE"
        Write-Host ""

        # Create backup
        $backupPath = Backup-CurrentDeployment -Component "TelegramBot"

        # Stop telegram bot service
        $stopped = Stop-ServiceComponent -ComponentName "Telegram Bot" -ServiceName $Config.TelegramBotServiceName
        if (-not $stopped) {
            throw "Failed to stop Telegram bot service"
        }

        # Update files
        # Temporarily change source path for telegram bot
        $originalSourcePath = $Config.SourcePath
        $Config.SourcePath = Join-Path $originalSourcePath "telegram-bot"

        Update-TelegramBotFiles

        # Restore original source path
        $Config.SourcePath = $originalSourcePath

        # Start telegram bot service
        $started = Start-ServiceComponent -ComponentName "Telegram Bot" `
                                         -ServiceName $Config.TelegramBotServiceName `
                                         -HealthUrl $Config.TelegramBotHealthUrl `
                                         -HealthTimeout $Config.TelegramBotHealthTimeout

        if ($started) {
            Write-Host "`n" + ("=" * 70) -ForegroundColor Green
            Write-Host "  TELEGRAM BOT DEPLOYED SUCCESSFULLY" -ForegroundColor Green
            Write-Host ("=" * 70) -ForegroundColor Green
            Write-Host "  Backup: $backupPath" -ForegroundColor Gray
            return $true
        } else {
            throw "Failed to start Telegram bot service after deployment"
        }

    } catch {
        Write-Host "`n[DEPLOYMENT FAILED] $_" -ForegroundColor Red
        return $false
    }
}

# =============================================================================
# MAIN EXECUTION FLOW
# =============================================================================

function Execute-ManageAction {
    param(
        [string]$Action,
        [string]$Component
    )

    $allSuccess = $true

    $components = @()
    switch ($Component) {
        "All" {
            $components = @(
                @{ Name = "Backend"; ServiceName = $Config.BackendServiceName;
                   HealthUrl = $Config.BackendHealthUrl; HealthTimeout = $Config.BackendHealthTimeout },
                @{ Name = "Telegram Bot"; ServiceName = $Config.TelegramBotServiceName;
                   HealthUrl = $Config.TelegramBotHealthUrl; HealthTimeout = $Config.TelegramBotHealthTimeout }
            )
        }
        "Backend" {
            $components = @(
                @{ Name = "Backend"; ServiceName = $Config.BackendServiceName;
                   HealthUrl = $Config.BackendHealthUrl; HealthTimeout = $Config.BackendHealthTimeout }
            )
        }
        "TelegramBot" {
            $components = @(
                @{ Name = "Telegram Bot"; ServiceName = $Config.TelegramBotServiceName;
                   HealthUrl = $Config.TelegramBotHealthUrl; HealthTimeout = $Config.TelegramBotHealthTimeout }
            )
        }
    }

    foreach ($comp in $components) {
        $result = switch ($Action) {
            "Start" {
                Start-ServiceComponent -ComponentName $comp.Name -ServiceName $comp.ServiceName `
                                     -HealthUrl $comp.HealthUrl -HealthTimeout $comp.HealthTimeout
            }
            "Stop" {
                Stop-ServiceComponent -ComponentName $comp.Name -ServiceName $comp.ServiceName
            }
            "Restart" {
                Restart-ServiceComponent -ComponentName $comp.Name -ServiceName $comp.ServiceName `
                                       -HealthUrl $comp.HealthUrl -HealthTimeout $comp.HealthTimeout
            }
        }

        if (-not $result) {
            $allSuccess = $false
        }
    }

    if ($allSuccess) {
        Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
        Write-Host "  OPERATION COMPLETED SUCCESSFULLY" -ForegroundColor Green
        Write-Host ("=" * 70) -ForegroundColor Cyan
    } else {
        Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
        Write-Host "  OPERATION COMPLETED WITH ERRORS" -ForegroundColor Red
        Write-Host ("=" * 70) -ForegroundColor Cyan
    }
}

function Execute-DeployAction {
    param([string]$Component)

    $success = switch ($Component) {
        "Backend" { Deploy-Backend }
        "TelegramBot" { Deploy-TelegramBot }
        "All" {
            $backendOk = Deploy-Backend
            $telegramOk = Deploy-TelegramBot
            $backendOk -and $telegramOk
        }
    }

    if ($success) {
        Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
        Write-Host "  DEPLOYMENT COMPLETED" -ForegroundColor Green
        Write-Host ("=" * 70) -ForegroundColor Cyan
    } else {
        Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
        Write-Host "  DEPLOYMENT FAILED" -ForegroundColor Red
        Write-Host ("=" * 70) -ForegroundColor Cyan
    }
}

function Show-AllStatus {
    Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
    Write-Host "  ROA2WEB - System Status" -ForegroundColor Cyan
    Write-Host ("=" * 70) -ForegroundColor Cyan

    Show-ServiceStatus -ComponentName "Backend" `
                      -ServiceName $Config.BackendServiceName `
                      -HealthUrl $Config.BackendHealthUrl `
                      -HealthTimeout $Config.BackendHealthTimeout

    Show-ServiceStatus -ComponentName "Telegram Bot" `
                      -ServiceName $Config.TelegramBotServiceName `
                      -HealthUrl $Config.TelegramBotHealthUrl `
                      -HealthTimeout $Config.TelegramBotHealthTimeout

    Write-Host "`n" + ("=" * 70) -ForegroundColor Cyan
}

function Main {
    # Check administrator privileges
    if (-not (Test-Administrator)) {
        Write-Host "`n[ERROR] This script requires Administrator privileges" -ForegroundColor Red
        Write-Host "Please run PowerShell as Administrator and try again.`n" -ForegroundColor Yellow
        exit 1
    }

    # Non-interactive mode
    if ($NonInteractive -and $Action) {
        switch ($Action) {
            "DeployBackend" { Execute-DeployAction -Component "Backend" }
            "DeployTelegramBot" { Execute-DeployAction -Component "TelegramBot" }
            "DeployAll" { Execute-DeployAction -Component "All" }
            "StartAll" { Execute-ManageAction -Action "Start" -Component "All" }
            "StopAll" { Execute-ManageAction -Action "Stop" -Component "All" }
            "RestartAll" { Execute-ManageAction -Action "Restart" -Component "All" }
            "Status" { Show-AllStatus }
        }
        return
    }

    # Interactive mode - main loop
    do {
        $mainChoice = Show-MainMenu

        switch ($mainChoice) {
            "Deploy" {
                do {
                    $deployChoice = Show-DeployMenu

                    if ($deployChoice -ne "Back") {
                        Execute-DeployAction -Component $deployChoice
                        Wait-ForKeyPress
                    }
                } while ($deployChoice -ne "Back")
            }

            "Manage" {
                do {
                    $manageChoice = Show-ManageMenu

                    if ($manageChoice.Action -ne "Back") {
                        Execute-ManageAction -Action $manageChoice.Action -Component $manageChoice.Component
                        Wait-ForKeyPress
                    }
                } while ($manageChoice.Action -ne "Back")
            }

            "Status" {
                Show-AllStatus
                Wait-ForKeyPress
            }

            "Quit" {
                Write-Host "`nGoodbye!`n" -ForegroundColor Cyan
                return
            }
        }
    } while ($true)
}

# Run main
Main