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

// GET /api/db/backup?dbId=...
export async function GET(req: NextRequest) {
  const authErr = await requireAuth(req)
  if (authErr) return authErr

  const { searchParams } = new URL(req.url)
  const dbId = searchParams.get('dbId')
  if (!dbId) return NextResponse.json({ error: 'Missing dbId' }, { status: 400 })

  const config = await readConfig()
  const db = config.databases.find(d => d.id === dbId)
  if (!db) return NextResponse.json({ error: 'Database not found' }, { status: 404 })

  try {
    const buffer = await createDbDumpBuffer(db)
    const dateStr = new Date().toISOString().replace(/[:.]/g, '-')
    const filename = `${db.name}_${dateStr}.sql`

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

    return new NextResponse(new Uint8Array(buffer), {
      headers: {
        'Content-Type': 'application/octet-stream',
        'Content-Disposition': `attachment; filename="${filename}"`,
      },
    })
  } catch (e: any) {
    await pool.query(
      `INSERT INTO backup_logs (db_id, status, message, file_size) VALUES ($1, $2, $3, $4)`,
      [dbId, 'error', e.message, 0]
    )
    return NextResponse.json({ error: e.message }, { status: 500 })
  }
}