import { NextRequest, NextResponse } from 'next/server'
import sql from '@/lib/db'

/**
 * GET /api/v1/config?env=production
 *
 * Mobile app bu endpoint'i çağırır.
 * Header: X-Api-Key: <app_api_key>
 * Query:  env = development | staging | production (default: production)
 *
 * Response: { "KEY": "value", "ANOTHER_KEY": "value2", ... }
 */
export async function GET(req: NextRequest) {
  const apiKey =
    req.headers.get('x-api-key') ??
    req.headers.get('authorization')?.replace('Bearer ', '')

  if (!apiKey) {
    return NextResponse.json(
      { error: 'Missing API key. Pass X-Api-Key header.' },
      { status: 401 }
    )
  }

  const env = req.nextUrl.searchParams.get('env') ?? 'production'
  const validEnvs = ['development', 'staging', 'production']
  if (!validEnvs.includes(env)) {
    return NextResponse.json(
      { error: `Invalid env. Must be one of: ${validEnvs.join(', ')}` },
      { status: 400 }
    )
  }

  // Find app by API key
  const [app] = await sql`
    SELECT id, name FROM apps WHERE api_key = ${apiKey} LIMIT 1
  `
  if (!app) {
    return NextResponse.json({ error: 'Invalid API key' }, { status: 401 })
  }

  // Fetch config entries for this app + environment in one join
  const entries = await sql`
    SELECT ce.key, ce.value
    FROM config_entries ce
    JOIN environments e ON e.id = ce.environment_id
    WHERE e.app_id = ${app.id} AND e.name = ${env}
  `

  const config: Record<string, string> = {}
  for (const entry of entries) {
    config[entry.key] = entry.value
  }

  return NextResponse.json(config, {
    headers: {
      'Cache-Control': 'no-store, no-cache, must-revalidate',
      'X-App': app.name,
      'X-Env': env,
    },
  })
}