# ============================================================================
# ROA UNINSTALL SCRIPT
# ============================================================================
# Removes all ROA application objects from Oracle database
#
# Usage:
#   .\99-uninstall-roa.ps1 -SystemPassword "yourpassword"
#   .\99-uninstall-roa.ps1 -SystemPassword "yourpassword" -Force
#   .\99-uninstall-roa.ps1 -ServiceName "XEPDB1" -SystemPassword "yourpassword" -Force
#
# Parameters:
#   -SystemPassword : SYS password for database connection (default: romfastsoft)
#   -ServiceName    : Oracle service name (auto-detected if not specified)
#   -Force          : Skip confirmation prompt
#
# ============================================================================

param(
    [Parameter(Mandatory=$false)]
    [string]$OracleHome,

    [Parameter(Mandatory=$false)]
    [string]$ServiceName,

    [Parameter(Mandatory=$false)]
    [string]$SystemPassword = "romfastsoft",

    [Parameter(Mandatory=$false)]
    [switch]$Force
)

$ErrorActionPreference = "Stop"

# ============================================================================
# LOAD CONFIGURATION AND LIBRARIES
# ============================================================================

$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$RootDir = Split-Path -Parent $ScriptDir

# Load config (optional - script can work with auto-detection)
$ConfigFile = Join-Path $RootDir "config.ps1"
if (Test-Path $ConfigFile) {
    . $ConfigFile
    # Use config values if parameters not provided
    if (-not $OracleHome -and $ORACLE_HOME) { $OracleHome = $ORACLE_HOME }
    if (-not $ServiceName -and $SERVICE_NAME) { $ServiceName = $SERVICE_NAME }
    if ($SystemPassword -eq "romfastsoft" -and $SYSTEM_PASSWORD) { $SystemPassword = $SYSTEM_PASSWORD }
}

# Load libraries
. (Join-Path $ScriptDir "lib\logging-functions.ps1")
. (Join-Path $ScriptDir "lib\oracle-functions.ps1")

# ============================================================================
# MAIN
# ============================================================================

Write-Host ""
Write-Host "============================================================" -ForegroundColor Cyan
Write-Host "       ROA UNINSTALL - REMOVING ALL ROA OBJECTS" -ForegroundColor Cyan
Write-Host "============================================================" -ForegroundColor Cyan
Write-Host ""

# Get Oracle Home
$oraHome = Get-OracleHome -OracleHome $OracleHome
Write-Host "[INFO] Oracle Home: $oraHome" -ForegroundColor Green

# Get listener host
$OracleHost = Get-ListenerHost -OracleHome $oraHome
Write-Host "[INFO] Database Host: $OracleHost" -ForegroundColor Green

# Auto-detect service name if not specified
if (-not $ServiceName) {
    $ServiceName = "XEPDB1"  # Default for Oracle XE
}
Write-Host "[INFO] Service Name: $ServiceName" -ForegroundColor Green

# Build connection string
$OraclePort = 1521
$ConnString = "${OracleHost}:${OraclePort}/${ServiceName}"

Write-Host ""
Write-Host "Target database: $ConnString" -ForegroundColor Yellow
Write-Host ""

# Confirmation
if (-not $Force) {
    Write-Host "WARNING: This will PERMANENTLY DELETE all ROA data!" -ForegroundColor Red
    Write-Host ""
    Write-Host "Objects to be removed:" -ForegroundColor Yellow
    Write-Host "  - All company user schemas (using ROA tablespace)"
    Write-Host "  - CONTAFIN_ORACLE user and all objects"
    Write-Host "  - Public synonyms pointing to CONTAFIN_ORACLE"
    Write-Host "  - SYS custom objects (AUTH_PACK, AUTH_SERII, etc.)"
    Write-Host "  - Application context SESIUNE"
    Write-Host "  - Tablespace ROA (including datafile)"
    Write-Host ""

    $confirm = Read-Host "Type 'YES' to confirm uninstall"
    if ($confirm -ne "YES") {
        Write-Host "Uninstall cancelled." -ForegroundColor Yellow
        exit 0
    }
}

Write-Host ""
Write-Host "Starting uninstall..." -ForegroundColor Cyan
Write-Host ""

# Find sqlplus
$SqlPlus = Join-Path $oraHome "bin\sqlplus.exe"
if (-not (Test-Path $SqlPlus)) {
    Write-Host "ERROR: sqlplus.exe not found at $SqlPlus" -ForegroundColor Red
    exit 1
}

# Run uninstall script
$SqlScript = Join-Path $RootDir "sql\uninstall-roa.sql"

if (-not (Test-Path $SqlScript)) {
    Write-Host "ERROR: uninstall-roa.sql not found at $SqlScript" -ForegroundColor Red
    exit 1
}

Write-Host "Running uninstall script..." -ForegroundColor Cyan
Write-Host ""

# Set Oracle environment
$env:ORACLE_HOME = $oraHome
$env:PATH = "$oraHome\bin;$env:PATH"
$env:NLS_LANG = "AMERICAN_AMERICA.AL32UTF8"

# Execute uninstall SQL script
try {
    & $SqlPlus "sys/${SystemPassword}@${ConnString} as sysdba" "@$SqlScript"
    $exitCode = $LASTEXITCODE
}
catch {
    Write-Host "ERROR: Failed to execute uninstall script: $_" -ForegroundColor Red
    exit 1
}

Write-Host ""
if ($exitCode -eq 0) {
    Write-Host "============================================================" -ForegroundColor Green
    Write-Host "       ROA UNINSTALL COMPLETE" -ForegroundColor Green
    Write-Host "============================================================" -ForegroundColor Green
    Write-Host ""
    Write-Host "Database is now clean. You can re-run the setup scripts." -ForegroundColor Cyan
}
else {
    Write-Host "============================================================" -ForegroundColor Yellow
    Write-Host "       ROA UNINSTALL COMPLETED WITH WARNINGS" -ForegroundColor Yellow
    Write-Host "============================================================" -ForegroundColor Yellow
    Write-Host ""
    Write-Host "Some objects may not have been removed. Review output above." -ForegroundColor Yellow
}
Write-Host ""