import { NextRequest, NextResponse } from "next/server";
import { getServerSession } from "@/lib/auth";
import { db } from "@/lib/db";
import { sounds } from "@/lib/db/schema";
import { writeFile, mkdir, unlink } from "fs/promises";
import path from "path";
import { v4 as uuidv4 } from "uuid";
import { convertToCompressedMp3 } from "@/lib/convert";

export const maxDuration = 60;

const UPLOAD_DIR = path.join(process.cwd(), "data", "uploads", "sounds");
const ALLOWED_EXTENSIONS = /\.(mp3|ogg|wav|flac|aac|m4a|wma|opus|webm|mp4|avi|mov|mkv|webm|wmv|flv)$/i;
const MAX_SIZE = 50 * 1024 * 1024; // 50 MB

export async function POST(req: NextRequest) {
  const session = await getServerSession();
  if (!session || !session.isAdmin) {
    return NextResponse.json({ error: "Forbidden" }, { status: 403 });
  }

  try {
    const formData = await req.formData();
    const file = formData.get("file") as File | null;
    if (!file) return NextResponse.json({ error: "No file" }, { status: 400 });

    if (!ALLOWED_EXTENSIONS.test(file.name)) {
      return NextResponse.json({ error: "Unsupported file format" }, { status: 400 });
    }

    if (file.size > MAX_SIZE) {
      return NextResponse.json({ error: "File too large (max 50MB)" }, { status: 400 });
    }

    await mkdir(UPLOAD_DIR, { recursive: true });

    const baseName = uuidv4();
    const inputPath = path.join(UPLOAD_DIR, `${baseName}.in`);
    const mp3Path = path.join(UPLOAD_DIR, `${baseName}.mp3`);

    const bytes = await file.arrayBuffer();
    await writeFile(inputPath, Buffer.from(bytes));

    let storedFilename: string;
    if (convertToCompressedMp3(inputPath, mp3Path)) {
      await unlink(inputPath).catch(() => {});
      storedFilename = `${baseName}.mp3`;

      const id = uuidv4();
      db.insert(sounds).values({
        id,
        originalName: file.name,
        storedFilename,
        duration: 6,
        uploadedBy: session.id,
        createdAt: new Date().toISOString(),
      }).run();

      return NextResponse.json({ url: `/uploads/sounds/${storedFilename}` });
    }

    await unlink(inputPath).catch(() => {});
    return NextResponse.json({ error: "Conversion failed" }, { status: 500 });
  } catch {
    return NextResponse.json({ error: "Upload failed" }, { status: 500 });
  }
}