# Script to backup the entire Postgres Docker volume
$timestamp = Get-Date -Format "yyyy-MM-dd_HH-mm-ss"
$scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$backupDir = Join-Path $scriptDir "backups"
$volumeName = "gitea-docker_postgres-data"
$backupFile = "postgres-volume-backup-$timestamp.tar"
$backupFilePath = Join-Path $backupDir $backupFile
$redundantBackupDir = "D:\Pr00jects\gitea-docker"
$logFile = Join-Path $backupDir "volume-backup-log.txt"
$currentDir = Get-Location

# Ensure backup directory exists
if (-not (Test-Path $backupDir)) {
    New-Item -ItemType Directory -Path $backupDir
}

# Ensure redundant backup directory exists
if (-not (Test-Path $redundantBackupDir)) {
    try {
        New-Item -ItemType Directory -Path $redundantBackupDir -Force
    } catch {
        Add-Content -Path $logFile -Value "[$timestamp] Warning: Could not create redundant backup directory at $redundantBackupDir. Error: $_"
    }
}

# Log start of backup
Add-Content -Path $logFile -Value "[$timestamp] Starting volume backup for $volumeName..."

# Check if volume exists
$volumeExists = docker volume ls --format "{{.Name}}" | Select-String -Pattern "^$volumeName$"
if (-not $volumeExists) {
    Write-Host "Volume $volumeName not found!" -ForegroundColor Red
    Add-Content -Path $logFile -Value "[$timestamp] Error: Volume $volumeName not found!"
    exit 1
}

# Create a temporary container to access the volume
Write-Host "Creating backup of Docker volume $volumeName..."
Add-Content -Path $logFile -Value "[$timestamp] Creating backup to $backupFilePath..."

# Change to backup directory and use simple relative paths for Docker
Set-Location -Path $backupDir
docker run --rm -v ${volumeName}:/volume -v ${PWD}:/backup alpine tar -cf /backup/$backupFile -C /volume ./

# Restore original directory
Set-Location -Path $currentDir

# Check if backup was successful
if ($LASTEXITCODE -eq 0 -and (Test-Path $backupFilePath) -and (Get-Item $backupFilePath).Length -gt 0) {
    Write-Host "Volume backup completed successfully to $backupFilePath!" -ForegroundColor Green
    Add-Content -Path $logFile -Value "[$timestamp] Volume backup completed successfully!"
    
    # Optional: Compress the backup file
    Write-Host "Compressing backup file..."
    Add-Content -Path $logFile -Value "[$timestamp] Compressing backup file..."
    $zipFileName = "$backupFilePath.zip"
    Compress-Archive -Path $backupFilePath -DestinationPath $zipFileName -Force
    Remove-Item $backupFilePath
    Write-Host "Backup compressed to $zipFileName" -ForegroundColor Green
    Add-Content -Path $logFile -Value "[$timestamp] Backup compressed to $zipFileName"
    
    # Copy backup to redundant location
    if (Test-Path $redundantBackupDir) {
        try {
            $redundantBackupFile = Join-Path $redundantBackupDir (Split-Path -Leaf $zipFileName)
            Copy-Item -Path $zipFileName -Destination $redundantBackupFile -Force
            Write-Host "Backup copied to redundant location: $redundantBackupFile" -ForegroundColor Green
            Add-Content -Path $logFile -Value "[$timestamp] Backup copied to redundant location: $redundantBackupFile"
        } catch {
            Write-Host "Error copying backup to redundant location: $_" -ForegroundColor Red
            Add-Content -Path $logFile -Value "[$timestamp] Error copying backup to redundant location: $_"
        }
    } else {
        Write-Host "Warning: Redundant backup directory not found: $redundantBackupDir" -ForegroundColor Yellow
        Add-Content -Path $logFile -Value "[$timestamp] Warning: Redundant backup directory not found: $redundantBackupDir"
    }
} else {
    Write-Host "Volume backup failed!" -ForegroundColor Red
    Add-Content -Path $logFile -Value "[$timestamp] Volume backup failed!"
}

# Optional: Clean up old volume backups (keep last 5)
$oldBackups = Get-ChildItem -Path $backupDir -Filter "postgres-volume-backup-*.zip" | Sort-Object LastWriteTime -Descending | Select-Object -Skip 5
foreach ($backup in $oldBackups) {
    Remove-Item $backup.FullName
    Write-Host "Removed old volume backup: $($backup.Name)"
    Add-Content -Path $logFile -Value "[$timestamp] Removed old volume backup: $($backup.Name)"
}