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 { convertOggToMp3 } from "@/lib/convert";
import fs from "fs";

const UPLOAD_DIR = path.join(process.cwd(), "public", "uploads", "sounds");

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 (!file.name.toLowerCase().endsWith(".ogg")) {
      return NextResponse.json({ error: "Only OGG files allowed" }, { status: 400 });
    }

    if (file.size > 2 * 1024 * 1024) {
      return NextResponse.json({ error: "File too large (max 2MB)" }, { status: 400 });
    }

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

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

    // save temporary OGG
    const bytes = await file.arrayBuffer();
    await writeFile(oggPath, Buffer.from(bytes));

    // duration estimate
    const duration = Math.round((file.size / (64 * 128)) * 10) / 10;

    // convert to MP3
    let storedFilename: string;
    if (convertOggToMp3(oggPath, mp3Path)) {
      await unlink(oggPath).catch(() => {});
      storedFilename = `${baseName}.mp3`;
    } else {
      storedFilename = `${baseName}.ogg`;
    }

    const id = uuidv4();
    db.insert(sounds).values({
      id,
      originalName: file.name.replace(/\.ogg$/i, ".mp3"),
      storedFilename,
      duration: Math.min(duration, 6),
      uploadedBy: session.id,
      createdAt: new Date().toISOString(),
    }).run();

    return NextResponse.json({ url: `/uploads/sounds/${storedFilename}` });
  } catch {
    return NextResponse.json({ error: "Upload failed" }, { status: 500 });
  }
}