import { NextRequest, NextResponse } from 'next/server'
import { requireAdmin } from '@/lib/auth'
import { getAiConfig, updateAiConfig, getPreferredLanguage, setPreferredLanguage } from '@/lib/app-settings'

export async function GET(request: NextRequest) {
  const auth = await requireAdmin(request)
  if (auth instanceof NextResponse) return auth

  const { endpoint, model, enabled } = getAiConfig()
  const preferredLanguage = getPreferredLanguage()
  return NextResponse.json({ endpoint, model, enabled, preferredLanguage })
}

export async function PUT(request: NextRequest) {
  const auth = await requireAdmin(request)
  if (auth instanceof NextResponse) return auth

  let body: { endpoint?: string; model?: string; enabled?: boolean; preferredLanguage?: string }
  try {
    body = await request.json()
  } catch {
    return NextResponse.json({ error: 'Invalid JSON body' }, { status: 400 })
  }

  const { endpoint, model, enabled, preferredLanguage } = body

  if (typeof endpoint !== 'string') {
    return NextResponse.json({ error: 'endpoint is required' }, { status: 400 })
  }
  if (typeof model !== 'string') {
    return NextResponse.json({ error: 'model is required' }, { status: 400 })
  }
  if (typeof enabled !== 'boolean') {
    return NextResponse.json({ error: 'enabled must be a boolean' }, { status: 400 })
  }

  updateAiConfig(endpoint, model, enabled)

  if (typeof preferredLanguage === 'string' && preferredLanguage.trim()) {
    setPreferredLanguage(preferredLanguage.trim())
  }

  return NextResponse.json({ endpoint, model, enabled, preferredLanguage: getPreferredLanguage() })
}