import { NextRequest, NextResponse } from 'next/server'
import { requireAuth } from '@/lib/auth'
import { readConfig } from '@/lib/config'
import { getCloudConnection } from '@/lib/appDb'
import { createDbDumpBuffer, uploadToDropbox, uploadToGoogleDriveOAuth, uploadToGCS, backupFilename } from '@/lib/backup'
import pool from '@/lib/appDb'

export async function POST(req: NextRequest) {
  const authErr = await requireAuth(req)
  if (authErr) return authErr

  const body = await req.json()
  const { db_id, connection_id, cloud_type: inlineType, credentials: inlineCredentials, gdrive_folder_id } = body

  const config = await readConfig()
  const db = config.databases.find(d => d.id === db_id)
  if (!db) return NextResponse.json({ ok: false, error: 'Veritabanı bulunamadı.' })

  // Bağlantı kaynağı: global connection veya inline
  let type: string, credentials: string, target: string
  if (connection_id) {
    const conn = await getCloudConnection(connection_id)
    if (!conn) return NextResponse.json({ ok: false, error: 'Cloud bağlantısı bulunamadı.' })
    type = conn.type
    credentials = conn.credentials
    target = gdrive_folder_id || conn.default_target || ''
  } else {
    if (!inlineCredentials?.trim()) return NextResponse.json({ ok: false, error: 'Credentials boş.' })
    type = inlineType
    credentials = inlineCredentials
    target = gdrive_folder_id || ''
  }

  const filename = type === 'gdrive' ? backupFilename() : backupFilename(db.name)

  try {
    const buffer = await createDbDumpBuffer(db)

    if (type === 'dropbox') {
      await uploadToDropbox(credentials.trim(), db.name, filename, buffer)
    } else if (type === 'gcs') {
      await uploadToGCS(credentials, target, db.name, filename, buffer)
    } else if (type === 'gdrive') {
      await uploadToGoogleDriveOAuth(credentials, db.name, filename, buffer, target || undefined)
    } else {
      return NextResponse.json({ ok: false, error: 'Desteklenmeyen cloud türü.' })
    }

    await pool.query(
      `INSERT INTO backup_logs (db_id, status, message, file_size) VALUES ($1, $2, $3, $4)`,
      [db_id, 'success', `Manuel yedek — ${type}`, buffer.length]
    )

    const sizeStr = buffer.length > 1024 * 1024
      ? `${(buffer.length / (1024 * 1024)).toFixed(2)} MB`
      : `${(buffer.length / 1024).toFixed(1)} KB`

    const pathStr = type === 'gdrive' ? `${db.name}/${filename}` : filename
    return NextResponse.json({ ok: true, detail: `✓ Yüklendi — ${pathStr} (${sizeStr})` })
  } catch (e: any) {
    await pool.query(`INSERT INTO backup_logs (db_id, status, message, file_size) VALUES ($1, $2, $3, $4)`, [db_id, 'error', e.message, 0]).catch(() => {})
    return NextResponse.json({ ok: false, error: e.message })
  }
}