# 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
#
# Parameters:
#   /SILENT - Non-interactive mode
#   /AFTER  - Cleanup AFTER restore (shutdown instance + stop service before deleting files)

$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 parameters
$silent = $args -contains "/SILENT" -or $args -contains "/AUTO"
$afterRestore = $args -contains "/AFTER"

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 ""
if ($afterRestore) {
    Write-Host "[1/6] Shutting down database (cleanup AFTER restore)..."
    
    # Check if Oracle service exists
    $service = Get-Service -Name "OracleServiceROA" -ErrorAction SilentlyContinue
    if ($service) {
        Write-Host "    Oracle service found, attempting shutdown..."
        
        # Shutdown instance using SQL*Plus
        $shutdownSQL = "WHENEVER SQLERROR CONTINUE`nSHUTDOWN ABORT;`nEXIT;"
        try {
            $shutdownSQL | & sqlplus -S / as sysdba 2>&1 | Out-Null
            Start-Sleep -Seconds 2
            Write-Host "    Instance shut down"
        } catch {
            Write-Host "    Shutdown command sent (errors ignored)"
        }
        
        # Stop Oracle service to release file locks
        if ($service.Status -eq "Running") {
            Write-Host "    Stopping Oracle service to release file locks..."
            try {
                Stop-Service -Name "OracleServiceROA" -Force -ErrorAction Stop
                Start-Sleep -Seconds 2
                Write-Host "    Service stopped"
            } catch {
                Write-Host "    WARNING: Failed to stop service: $_" -ForegroundColor Yellow
            }
        }
        
        # Force kill any remaining 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
} else {
    Write-Host "[1/6] Skipping instance shutdown (cleanup BEFORE restore)"
    Write-Host "    Instance and service left in current state"
    Write-Host "    Restore script will handle service state properly"
}

Write-Host "[2/6] Oracle service preserved for reuse"
if ($afterRestore) {
    Write-Host "    Service stopped to release file locks"
} else {
    Write-Host "    Service remains in current state (running or stopped)"
    Write-Host "    Optimization: If running, restore saves ~30s startup time"
}

Write-Host "[3/6] Deleting database files + SPFILE..."
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 "    Deleting SPFILE (ensures PFILE-based startup)..."
Remove-Item "$env:ORACLE_HOME\database\SPFILE*.ORA" -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 "  [YES] Oracle service (preserved, will be reused)"
Write-Host "  [NO]  SPFILE (deleted to ensure PFILE startup)"
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 CLEAN STATE (service preserved)!"
Write-Host ""
Write-Host "Next step: Run D:\oracle\scripts\rman_restore_from_zero.ps1"
Write-Host "  (It will reuse the existing Oracle service and restore the database)"
Write-Host ""

exit 0