# =============================================================================
# ROA Oracle Database Setup Configuration
# =============================================================================
# This file is sourced by setup scripts. It auto-detects Oracle paths and
# prompts for user input when needed.
#
# Usage:
#   1. Copy to config.ps1: Copy-Item config.example.ps1 config.ps1
#   2. Run any setup script - it will prompt for missing values
#   3. Or edit config.ps1 manually to set values
#
# If a value is $null or empty, the script will auto-detect or prompt.
# =============================================================================

# -----------------------------------------------------------------------------
# Oracle Installation Paths (auto-detected if empty)
# -----------------------------------------------------------------------------

# Oracle Home - leave empty to auto-detect from registry/common paths
$ORACLE_HOME = $null

# Oracle Base - derived from ORACLE_HOME if empty
$ORACLE_BASE = $null

# -----------------------------------------------------------------------------
# Database Connection (auto-detected if empty)
# -----------------------------------------------------------------------------

# Service Name - leave empty to auto-detect (XEPDB1 for XE, ROA for SE)
$SERVICE_NAME = $null

# Database host - auto-detected from listener if empty
$DB_HOST = $null

# Database port
$DB_PORT = 1521

# -----------------------------------------------------------------------------
# Passwords - MUST be set (will prompt if empty)
# -----------------------------------------------------------------------------

# SYS/SYSTEM password (set during Oracle installation)
$SYSTEM_PASSWORD = $null

# CONTAFIN_ORACLE schema password
$CONTAFIN_PASSWORD = "ROMFASTSOFT"

# Default password for new company schemas
$DEFAULT_COMPANY_PASSWORD = "ROMFASTSOFT"

# -----------------------------------------------------------------------------
# Paths (auto-detected if empty)
# -----------------------------------------------------------------------------

# Directory for DMP files (import/export)
$DMPDIR = "C:\DMPDIR"

# Oracle DIRECTORY object name
$DMPDIR_NAME = "DMPDIR"

# Datafile directory - auto-detected from existing datafiles if empty
$DATAFILE_DIR = $null

# -----------------------------------------------------------------------------
# Tablespace Configuration
# -----------------------------------------------------------------------------

$TABLESPACE_NAME = "ROA"
$TABLESPACE_SIZE = "2G"
$TABLESPACE_MAXSIZE = "UNLIMITED"
$TABLESPACE_AUTOEXTEND = $true

# -----------------------------------------------------------------------------
# Import Settings
# -----------------------------------------------------------------------------

$PARALLEL_JOBS = 2
$TABLE_EXISTS_ACTION = "REPLACE"

# -----------------------------------------------------------------------------
# Logging
# -----------------------------------------------------------------------------

$LOG_DIR = "$PSScriptRoot\logs"
$VERBOSE_LOGGING = $true

# -----------------------------------------------------------------------------
# Advanced Settings
# -----------------------------------------------------------------------------

$NLS_CHARACTERSET = "WE8MSWIN1252"
$USER_PROFILE = "DEFAULT"
$DEFAULT_TABLESPACE = "USERS"
$TEMP_TABLESPACE = "TEMP"

# =============================================================================
# AUTO-DETECTION AND PROMPTING FUNCTIONS
# =============================================================================

function Initialize-Config {
    <#
    .SYNOPSIS
        Initialize configuration by auto-detecting values and prompting for missing ones.
    #>

    Write-Host ""
    Write-Host "========================================" -ForegroundColor Cyan
    Write-Host "  ROA Oracle Setup - Configuration" -ForegroundColor Cyan
    Write-Host "========================================" -ForegroundColor Cyan
    Write-Host ""

    # Auto-detect Oracle Home
    if (-not $script:ORACLE_HOME) {
        $script:ORACLE_HOME = Find-OracleHome
        if ($script:ORACLE_HOME) {
            Write-Host "[AUTO] Oracle Home: $script:ORACLE_HOME" -ForegroundColor Green
        } else {
            $script:ORACLE_HOME = Read-Host "Enter Oracle Home path (e.g., C:\app\oracle\product\21c\dbhomeXE)"
        }
    } else {
        Write-Host "[SET]  Oracle Home: $script:ORACLE_HOME" -ForegroundColor Gray
    }

    # Derive Oracle Base
    if (-not $script:ORACLE_BASE) {
        # Go up from dbhomeXE to product to 21c to oracle to app
        $script:ORACLE_BASE = Split-Path (Split-Path (Split-Path $script:ORACLE_HOME -Parent) -Parent) -Parent
        Write-Host "[AUTO] Oracle Base: $script:ORACLE_BASE" -ForegroundColor Green
    }

    # Prompt for SYSTEM password if not set
    if (-not $script:SYSTEM_PASSWORD) {
        $securePass = Read-Host "Enter SYSTEM password" -AsSecureString
        $script:SYSTEM_PASSWORD = [Runtime.InteropServices.Marshal]::PtrToStringAuto(
            [Runtime.InteropServices.Marshal]::SecureStringToBSTR($securePass))
    }

    # Auto-detect DB_HOST from listener
    if (-not $script:DB_HOST) {
        $script:DB_HOST = Find-ListenerHost
        if ($script:DB_HOST) {
            Write-Host "[AUTO] Database Host: $script:DB_HOST" -ForegroundColor Green
        } else {
            $script:DB_HOST = "localhost"
            Write-Host "[DEFAULT] Database Host: $script:DB_HOST" -ForegroundColor Yellow
        }
    } else {
        Write-Host "[SET]  Database Host: $script:DB_HOST" -ForegroundColor Gray
    }

    # Build connection string
    $script:DB_CONNECT = "${script:DB_HOST}:${script:DB_PORT}"

    # Auto-detect Service Name
    if (-not $script:SERVICE_NAME) {
        $script:SERVICE_NAME = Find-ServiceName
        if ($script:SERVICE_NAME) {
            Write-Host "[AUTO] Service Name: $script:SERVICE_NAME" -ForegroundColor Green
        } else {
            $script:SERVICE_NAME = Read-Host "Enter Service Name (XEPDB1 for XE, or your database name)"
        }
    } else {
        Write-Host "[SET]  Service Name: $script:SERVICE_NAME" -ForegroundColor Gray
    }

    # Full connection string
    $script:DB_CONNECT = "${script:DB_HOST}:${script:DB_PORT}/${script:SERVICE_NAME}"
    Write-Host "[INFO] Connection: $script:DB_CONNECT" -ForegroundColor Cyan

    # Auto-detect datafile directory
    if (-not $script:DATAFILE_DIR) {
        $script:DATAFILE_DIR = Find-DatafileDir
        if ($script:DATAFILE_DIR) {
            Write-Host "[AUTO] Datafile Dir: $script:DATAFILE_DIR" -ForegroundColor Green
        } else {
            Write-Host "[WARN] Could not auto-detect datafile directory" -ForegroundColor Yellow
            $script:DATAFILE_DIR = Read-Host "Enter datafile directory path"
        }
    } else {
        Write-Host "[SET]  Datafile Dir: $script:DATAFILE_DIR" -ForegroundColor Gray
    }

    # Create log directory
    if (-not (Test-Path $script:LOG_DIR)) {
        New-Item -ItemType Directory -Path $script:LOG_DIR -Force | Out-Null
    }

    Write-Host ""
    Write-Host "Configuration complete!" -ForegroundColor Green
    Write-Host ""
}

function Find-OracleHome {
    <#
    .SYNOPSIS
        Auto-detect Oracle Home from registry or common paths.
    #>

    # Try ORACLE_HOME environment variable
    if ($env:ORACLE_HOME -and (Test-Path "$env:ORACLE_HOME\bin\sqlplus.exe")) {
        return $env:ORACLE_HOME
    }

    # Try registry
    $regPaths = @(
        'HKLM:\SOFTWARE\Oracle\KEY_OraDB21Home1',
        'HKLM:\SOFTWARE\Oracle\KEY_OraDB18Home1',
        'HKLM:\SOFTWARE\Oracle\KEY_XE',
        'HKLM:\SOFTWARE\Wow6432Node\Oracle\KEY_OraDB21Home1'
    )

    foreach ($regPath in $regPaths) {
        if (Test-Path $regPath) {
            $oraHome = (Get-ItemProperty -Path $regPath -ErrorAction SilentlyContinue).ORACLE_HOME
            if ($oraHome -and (Test-Path "$oraHome\bin\sqlplus.exe")) {
                return $oraHome
            }
        }
    }

    # Try common paths (including user-specific)
    $currentUser = $env:USERNAME
    $commonPaths = @(
        "C:\app\$currentUser\product\21c\dbhomeXE",
        "C:\app\$currentUser\product\21c\dbhome_1",
        'C:\app\oracle\product\21c\dbhomeXE',
        'C:\app\oracle\product\21c\dbhome_1',
        'C:\app\romfast\product\21c\dbhomeXE',
        "D:\app\$currentUser\product\21c\dbhomeXE",
        'D:\app\oracle\product\21c\dbhomeXE'
    )

    foreach ($path in $commonPaths) {
        if (Test-Path "$path\bin\sqlplus.exe") {
            return $path
        }
    }

    return $null
}

function Find-ListenerHost {
    <#
    .SYNOPSIS
        Get the host from listener configuration.
    #>

    if (-not $script:ORACLE_HOME) { return $null }

    try {
        $lsnrctl = Join-Path $script:ORACLE_HOME "bin\lsnrctl.exe"
        if (-not (Test-Path $lsnrctl)) { return $null }

        $output = & $lsnrctl status 2>&1 | Out-String

        # Parse HOST from listener output
        if ($output -match "HOST=([^\)]+)\)") {
            $host = $Matches[1]
            # If it's 0.0.0.0 or localhost variant, try to get actual IP
            if ($host -eq "0.0.0.0" -or $host -match "^127\." -or $host -eq "localhost") {
                # Get first non-loopback IPv4 address
                $ip = (Get-NetIPAddress -AddressFamily IPv4 |
                       Where-Object { $_.IPAddress -notmatch "^127\." } |
                       Select-Object -First 1).IPAddress
                if ($ip) { return $ip }
            }
            return $host
        }
    } catch {
        # Ignore errors
    }

    return $null
}

function Find-ServiceName {
    <#
    .SYNOPSIS
        Auto-detect service name from listener.
    #>

    if (-not $script:ORACLE_HOME) { return $null }

    try {
        $lsnrctl = Join-Path $script:ORACLE_HOME "bin\lsnrctl.exe"
        if (-not (Test-Path $lsnrctl)) { return $null }

        $output = & $lsnrctl status 2>&1 | Out-String

        # Look for XEPDB1 first (Oracle XE PDB)
        if ($output -match 'Service "xepdb1"') {
            return "XEPDB1"
        }
        # Look for ROA
        if ($output -match 'Service "roa"') {
            return "ROA"
        }
        # Look for XE
        if ($output -match 'Service "XE"') {
            return "XE"
        }
    } catch {
        # Ignore errors
    }

    # Default to XEPDB1 for modern Oracle XE
    return "XEPDB1"
}

function Find-DatafileDir {
    <#
    .SYNOPSIS
        Auto-detect datafile directory from existing database files.
    #>

    if (-not $script:ORACLE_HOME -or -not $script:SYSTEM_PASSWORD -or -not $script:SERVICE_NAME) {
        return $null
    }

    try {
        $sqlplus = Join-Path $script:ORACLE_HOME "bin\sqlplus.exe"
        $connStr = "system/$script:SYSTEM_PASSWORD@${script:DB_HOST}:${script:DB_PORT}/${script:SERVICE_NAME}"

        $sql = @"
SET PAGESIZE 0 FEEDBACK OFF VERIFY OFF HEADING OFF ECHO OFF LINESIZE 500
SELECT SUBSTR(file_name, 1, INSTR(file_name, '\', -1) - 1)
FROM dba_data_files
WHERE tablespace_name = 'SYSTEM' AND ROWNUM = 1;
EXIT;
"@

        $result = $sql | & $sqlplus -s $connStr 2>$null
        $path = ($result -split "`n" | Where-Object { $_ -match "^[A-Z]:\\" } | Select-Object -First 1)

        if ($path) {
            return $path.Trim()
        }
    } catch {
        # Ignore errors
    }

    return $null
}

function Get-OracleConnection {
    return "system/$script:SYSTEM_PASSWORD@$script:DB_CONNECT"
}

function Get-SysdbaConnection {
    return "sys/$script:SYSTEM_PASSWORD@$script:DB_CONNECT as sysdba"
}

function Get-SqlPlusPath {
    return Join-Path $script:ORACLE_HOME "bin\sqlplus.exe"
}

function Get-ImpdpPath {
    return Join-Path $script:ORACLE_HOME "bin\impdp.exe"
}

function Get-ExpdpPath {
    return Join-Path $script:ORACLE_HOME "bin\expdp.exe"
}

# =============================================================================
# AUTO-INITIALIZE when sourced (if not already configured)
# =============================================================================

# Check if this is being sourced by a setup script
if ($MyInvocation.InvocationName -ne '.') {
    Write-Host "This file should be dot-sourced: . .\config.ps1" -ForegroundColor Yellow
}