# Oracle Database Complete Cleanup Script (PowerShell)
# Purpose: Remove all database files and services to restore DR VM to clean state
# Run as: Administrator
# Location: D:\oracle\scripts\cleanup_database.ps1

$ErrorActionPreference = "Continue"

$env:ORACLE_HOME = "C:\Users\Administrator\Downloads\WINDOWS.X64_193000_db_home"
$env:ORACLE_SID = "ROA"
$env:PATH = "$env:ORACLE_HOME\bin;$env:PATH"

Write-Host "============================================"
Write-Host "Oracle Database Cleanup Script"
Write-Host "============================================"
Write-Host ""
Write-Host "This script will:"
Write-Host "  1. Stop and delete Oracle service"
Write-Host "  2. Delete all database files (datafiles, control files, redo logs)"
Write-Host "  3. Delete local FRA (backups are on F:\, safe to delete)"
Write-Host "  4. Delete trace files"
Write-Host "  5. Leave VM in completely clean state (no service, no DB files)"
Write-Host ""

# Check if running in non-interactive mode
$silent = $args -contains "/SILENT" -or $args -contains "/AUTO"

if (-not $silent) {
    Write-Host "WARNING: This will DELETE the entire database!" -ForegroundColor Red
    Write-Host "Starting cleanup in 3 seconds... (Press Ctrl+C to cancel)"
    Start-Sleep -Seconds 3
}

# Create directories
New-Item -ItemType Directory -Path "D:\oracle\temp" -Force | Out-Null
New-Item -ItemType Directory -Path "D:\oracle\logs" -Force | Out-Null

Write-Host ""
Write-Host "[1/6] Shutting down database (if running)..."

# Check if Oracle service exists
$service = Get-Service -Name "OracleServiceROA" -ErrorAction SilentlyContinue
if ($service) {
    Write-Host "    Oracle service found, attempting shutdown..."
    
    # Try to shutdown database using SQL*Plus with inline command
    $shutdownSQL = "SHUTDOWN ABORT;`nEXIT;"
    try {
        $shutdownSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null
        Start-Sleep -Seconds 2
    } catch {
        Write-Host "    Shutdown command sent (errors ignored)"
    }
    
    # Force kill any Oracle processes
    Get-Process -Name "sqlplus" -ErrorAction SilentlyContinue | Stop-Process -Force -ErrorAction SilentlyContinue
    Get-Process -Name "oracle" -ErrorAction SilentlyContinue | Stop-Process -Force -ErrorAction SilentlyContinue
} else {
    Write-Host "    Oracle service not found, skipping shutdown"
}
Start-Sleep -Seconds 2

Write-Host "[2/6] Stopping and deleting Oracle service + registry + instance..."

# Method 1: Use oradim to delete Oracle instance
$env:ORACLE_HOME = "C:\Users\Administrator\Downloads\WINDOWS.X64_193000_db_home"
$env:PATH = "$env:ORACLE_HOME\bin;$env:PATH"
& oradim -delete -sid ROA 2>&1 | Out-Null
Write-Host "    Oracle instance deleted with oradim"

# Method 2: Delete service directly (backup method)
$service = Get-Service -Name "OracleServiceROA" -ErrorAction SilentlyContinue
if ($service) {
    Stop-Service -Name "OracleServiceROA" -Force -ErrorAction SilentlyContinue
    Start-Sleep -Seconds 2
    & sc.exe delete OracleServiceROA 2>&1 | Out-Null
    Write-Host "    Oracle service deleted with sc"
}

# Method 3: Delete Oracle registry keys
$regPath = "HKLM:\SOFTWARE\ORACLE\KEY_OraDB19Home1"
Remove-ItemProperty -Path $regPath -Name "ORA_ROA_PFILE" -ErrorAction SilentlyContinue
Remove-ItemProperty -Path $regPath -Name "ORA_ROA_AUTOSTART" -ErrorAction SilentlyContinue
Remove-ItemProperty -Path $regPath -Name "ORA_ROA_SHUTDOWN" -ErrorAction SilentlyContinue
Remove-ItemProperty -Path $regPath -Name "ORA_ROA_SHUTDOWNTYPE" -ErrorAction SilentlyContinue
Remove-ItemProperty -Path $regPath -Name "ORA_ROA_SHUTDOWN_TIMEOUT" -ErrorAction SilentlyContinue
Write-Host "    Registry keys cleaned"
Start-Sleep -Seconds 2

Write-Host "[3/6] Deleting database files..."
Write-Host "    Deleting datafiles..."
Remove-Item "C:\Users\oracle\oradata\ROA\*.dbf" -Force -ErrorAction SilentlyContinue
Write-Host "    Deleting control files..."
Remove-Item "C:\Users\oracle\oradata\ROA\*.ctl" -Force -ErrorAction SilentlyContinue
Write-Host "    Deleting redo logs..."
Remove-Item "C:\Users\oracle\oradata\ROA\*.log" -Force -ErrorAction SilentlyContinue

Write-Host "[4/6] Deleting local FRA (backups are on F:\)..."
if (Test-Path "C:\Users\oracle\recovery_area\ROA") {
    Remove-Item "C:\Users\oracle\recovery_area\ROA" -Recurse -Force -ErrorAction SilentlyContinue
    New-Item -ItemType Directory -Path "C:\Users\oracle\recovery_area\ROA" -Force | Out-Null
    Write-Host "    FRA cleared"
} else {
    New-Item -ItemType Directory -Path "C:\Users\oracle\recovery_area\ROA" -Force | Out-Null
    Write-Host "    FRA directory created"
}

Write-Host "[5/6] Deleting trace files (to save space)..."
Remove-Item "C:\Users\oracle\diag\rdbms\roa\ROA\trace\*.trc" -Force -ErrorAction SilentlyContinue
Remove-Item "C:\Users\oracle\diag\rdbms\roa\ROA\trace\*.trm" -Force -ErrorAction SilentlyContinue
Write-Host "    Trace files deleted"

Write-Host ""
Write-Host "============================================"
Write-Host "Database Cleanup Complete!"
Write-Host "============================================"
Write-Host ""
Write-Host "Current state:"
Write-Host "  [YES] Oracle software installed"
Write-Host "  [YES] PFILE exists (C:\Users\oracle\admin\ROA\pfile\initROA.ora)"
Write-Host "  [NO]  Oracle service (will be created during restore)"
Write-Host "  [NO]  Database files (will be restored from backups)"
Write-Host "  [NO]  Control files (will be restored from backups)"
Write-Host "  [NO]  Datafiles (will be restored from backups)"
Write-Host ""
Write-Host "VM is now in COMPLETELY CLEAN STATE!"
Write-Host ""
Write-Host "Next step: Run D:\oracle\scripts\rman_restore_from_zero.ps1"
Write-Host "  (It will create the Oracle service and restore the database)"
Write-Host ""

exit 0