param(
  [Parameter(Mandatory = $true)]
  [string]$Destination
)

$ErrorActionPreference = 'Stop'
$resolved = [System.IO.Path]::GetFullPath($Destination)
New-Item -ItemType Directory -Force -Path $resolved | Out-Null

$timestamp = Get-Date -Format 'yyyyMMdd-HHmmss'
$backupDir = Join-Path $resolved "telegram-gateway-$timestamp"
New-Item -ItemType Directory -Force -Path $backupDir | Out-Null

docker exec tgw-postgres pg_dump -U postgres -d telegram_gateway -Fc -f /tmp/gateway.dump
docker cp tgw-postgres:/tmp/gateway.dump (Join-Path $backupDir 'postgres.dump')
docker exec tgw-redis redis-cli SAVE | Out-Null
docker cp tgw-redis:/data/dump.rdb (Join-Path $backupDir 'redis.rdb')
docker run --rm --volumes-from tgw-app -v "${backupDir}:/backup" `
  node:20-bookworm-slim `
  tar -czf /backup/tdlib-data.tar.gz -C /app tdlib_data uploads

$publicTables = [int](docker exec tgw-postgres psql -U postgres -d telegram_gateway -Atc `
  "select count(*) from information_schema.tables where table_schema='public';")
$tenantRows = [int](docker exec tgw-postgres psql -U postgres -d telegram_gateway -Atc `
  'select count(*) from tenants;')
$accountRows = [int](docker exec tgw-postgres psql -U postgres -d telegram_gateway -Atc `
  'select count(*) from tg_accounts;')
$redisDbSize = [int](docker exec tgw-redis redis-cli DBSIZE)
$tdlibFileCount = [int](docker exec tgw-app sh -c `
  "find /app/tdlib_data /app/uploads -type f 2>/dev/null | wc -l")

$manifest = @{
  createdAt = (Get-Date).ToUniversalTime().ToString('o')
  postgres = 'postgres.dump'
  redis = 'redis.rdb'
  tdlib = 'tdlib-data.tar.gz'
  sha256 = @{}
  expected = @{
    publicTables = $publicTables
    tenantRows = $tenantRows
    accountRows = $accountRows
    redisDbSize = $redisDbSize
    tdlibFileCount = $tdlibFileCount
  }
}
foreach ($file in @('postgres.dump', 'redis.rdb', 'tdlib-data.tar.gz')) {
  $manifest.sha256[$file] = (Get-FileHash -Algorithm SHA256 (Join-Path $backupDir $file)).Hash
}
$manifest | ConvertTo-Json -Depth 4 | Set-Content -Encoding utf8 (Join-Path $backupDir 'manifest.json')
Write-Output $backupDir