$ErrorActionPreference = "Stop"

$ProjectDir = Get-Location
$Timestamp = Get-Date -Format "yyyyMMdd_HHmmss"
$BackupDir = Join-Path $ProjectDir "backups"
$BackupFile = Join-Path $BackupDir "kv_tiktok_backup_$Timestamp.zip"

# Create backup directory if it doesn't exist
if (-not (Test-Path $BackupDir)) {
    New-Item -ItemType Directory -Path $BackupDir | Out-Null
    Write-Host "Created backup directory: $BackupDir" -ForegroundColor Cyan
}

Write-Host "Starting backup of $ProjectDir..." -ForegroundColor Cyan
Write-Host "Target file: $BackupFile" -ForegroundColor Cyan

# Exclude list (Patterns to ignore)
$ExcludePatterns = @(
    "^\.git", 
    "^\.venv", 
    "^node_modules", 
    "__pycache__", 
    "^backups", 
    "\.log$", 
    "backend\\downloads", 
    "backend\\cache", 
    "backend\\session", 
    "frontend\\dist"
)

# Get files to zip
$FilesToZip = Get-ChildItem -Path $ProjectDir -Recurse | Where-Object {
    $relativePath = $_.FullName.Substring($ProjectDir.Path.Length + 1)
    $shouldExclude = $false
    
    foreach ($pattern in $ExcludePatterns) {
        if ($relativePath -match $pattern) {
            $shouldExclude = $true
            break
        }
    }
    
    # Also exclude the backup directory itself and any zip files inside root (if active)
    if ($relativePath -like "backups\*") { $shouldExclude = $true }
    
    return -not $shouldExclude
}

if ($FilesToZip.Count -eq 0) {
    Write-Error "No files found to backup!"
}

# Compress
Write-Host "Compressing $($FilesToZip.Count) files..." -ForegroundColor Yellow
$FilesToZip | Compress-Archive -DestinationPath $BackupFile -Force

if (Test-Path $BackupFile) {
    $Item = Get-Item $BackupFile
    $SizeMB = [math]::Round($Item.Length / 1MB, 2)
    Write-Host "Backup created successfully!" -ForegroundColor Green
    Write-Host "Location: $BackupFile"
    Write-Host "Size: $SizeMB MB"
}
else {
    Write-Error "Backup failed!"
}