import { NextRequest, NextResponse } from 'next/server'
import { writeFile, mkdir } from 'fs/promises'
import path from 'path'
import { randomUUID } from 'crypto'
import { getDb } from '@/lib/db'
import { convertHeicToJpeg } from '@/lib/heic'

export const runtime = 'nodejs'
export const maxDuration = 60

const DATA_DIR = path.resolve(process.cwd(), process.env.DATA_DIR || 'data')

const PHOTO_MIMES: Record<string, boolean> = {
  'image/jpeg': true,
  'image/jpg': true,
  'image/png': true,
  'image/webp': true,
  'image/gif': true,
  'image/heic': true,
  'image/heif': true,
}

const VIDEO_MIMES: Record<string, boolean> = {
  'video/mp4': true,
  'video/quicktime': true,
  'video/x-msvideo': true,
  'video/webm': true,
}

// GET: List all pending/approved family uploads
export async function GET() {
  const db = getDb()
  const uploads = db
    .prepare("SELECT * FROM media WHERE status IN ('pending', 'approved') ORDER BY created_at DESC")
    .all()
  return NextResponse.json(uploads)
}

export async function POST(req: NextRequest) {
  const formData = await req.formData()
  const file = formData.get('file') as File | null
  const name = formData.get('name') as string | null
  const email = formData.get('email') as string | null
  const relation = formData.get('relation') as string | null

  if (!file) {
    return NextResponse.json({ error: 'Datei erforderlich' }, { status: 400 })
  }

  let mimeType = file.type?.toLowerCase() || ''
  const ext = path.extname(file.name).toLowerCase()

  if (!mimeType && (ext === '.heic' || ext === '.heif')) {
    mimeType = 'image/heic'
  }

  let type: 'photo' | 'video'
  let uploadDir: string

  if (PHOTO_MIMES[mimeType]) {
    type = 'photo'
    uploadDir = 'photos'
  } else if (VIDEO_MIMES[mimeType]) {
    type = 'video'
    uploadDir = 'videos'
  } else {
    return NextResponse.json(
      { error: 'Nur Fotos und Videos erlaubt' },
      { status: 400 }
    )
  }

  const buffer = Buffer.from(await file.arrayBuffer())

  // Convert HEIC/HEIF to JPEG so all browsers can display it
  let finalBuffer: Buffer = buffer
  let finalExt = ext
  if (mimeType === 'image/heic' || mimeType === 'image/heif') {
    try {
      finalBuffer = await convertHeicToJpeg(buffer)
      finalExt = '.jpg'
    } catch {
      // Conversion failed — keep original
    }
  }

  const filename = `${uploadDir}/${randomUUID()}${finalExt || '.bin'}`
  const filePath = path.join(DATA_DIR, 'uploads', filename)

  await mkdir(path.dirname(filePath), { recursive: true })
  await writeFile(filePath, finalBuffer)

  // Build caption with uploader info
  let caption = `Von ${(name || 'Anonym').trim()}`
  if (relation?.trim()) caption += ` (${relation.trim()})`

  const db = getDb()
  const result = db
    .prepare(
      "INSERT INTO media (filename, original_name, type, caption, status) VALUES (?, ?, ?, ?, 'pending')"
    )
    .run(filename, file.name, type, caption)

  const media = db
    .prepare('SELECT * FROM media WHERE id = ?')
    .get(result.lastInsertRowid)
  
  return NextResponse.json(media, { status: 201 })
}