import { NextRequest, NextResponse } from 'next/server'
import { requireAdmin } from '@/lib/require-admin'
import { EMPTY_SITE_PAGES, SITE_MEDIA, SITE_PAGES, validateSitePages } from '@/lib/site-pages'
import { readSitePages } from '@/lib/site-pages.server'

// Prisma client instance
import { prisma } from "@/lib/prisma"

// GET /api/site-pages - liefert die Inhalte der rechtlichen Seiten
export async function GET() {
  try {
    return NextResponse.json(await readSitePages())
  } catch (error) {
    console.error('Error fetching site pages:', error)
    return NextResponse.json(
      { error: 'Fehler beim Abrufen der Seiteninhalte' },
      { status: 500 }
    )
  }
}

// PUT /api/site-pages - speichert die Inhalte der rechtlichen Seiten (Admin)
export async function PUT(request: NextRequest) {
  try {
    const denied = await requireAdmin()
    if (denied) return denied

    const data = await request.json()


    const result = await prisma.$transaction(async (tx) => {
      const previous = await tx.sitePages.findUnique({ where: { id: 1 } })
      const errors = validateSitePages(data, previous ?? EMPTY_SITE_PAGES)
      if (errors.length) return { errors }
      const values = Object.fromEntries(
        [...SITE_PAGES, ...SITE_MEDIA].map(key => [key, data[key].trim()])
      )
      const saved = await tx.sitePages.upsert({
        where: { id: 1 }, update: values, create: { id: 1, ...values },
      })
      return { saved }
    })
    if (result.errors) return NextResponse.json({ error: "Bitte prüfen Sie die Seiteninhalte.", details: result.errors }, { status: 400 })
    const saved = result.saved
    return NextResponse.json(saved)
  } catch (error) {
    console.error('Error updating site pages:', error)
    return NextResponse.json(
      { error: 'Fehler beim Speichern der Seiteninhalte' },
      { status: 500 }
    )
  }
}