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 } from "fs/promises";
import path from "path";
import { v4 as uuidv4 } from "uuid";

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 { name, duration, previewUrl } = await req.json();
    if (!previewUrl || !name) {
      return NextResponse.json({ error: "Missing name or previewUrl" }, { status: 400 });
    }

    if (duration > 6) {
      return NextResponse.json({ error: "Sound too long (max 6s)" }, { status: 400 });
    }

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

    const res = await fetch(previewUrl);
    if (!res.ok) return NextResponse.json({ error: "Failed to download preview" }, { status: 502 });

    const buffer = Buffer.from(await res.arrayBuffer());

    // trim to 6 seconds: approximate by byte ratio
    const maxBytes = Math.floor(buffer.length * Math.min(6 / duration, 1));
    const trimmed = buffer.subarray(0, maxBytes);

    const ext = ".mp3";
    const filename = `${uuidv4()}${ext}`;
    const filepath = path.join(UPLOAD_DIR, filename);
    await writeFile(filepath, trimmed);

    const id = uuidv4();
    const originalName = name.replace(/\.[^.]+$/, "") + ext;

    db.insert(sounds).values({
      id,
      originalName,
      storedFilename: filename,
      duration: Math.min(duration, 6),
      uploadedBy: session.id,
      createdAt: new Date().toISOString(),
    }).run();

    return NextResponse.json({
      url: `/uploads/sounds/${filename}`,
      originalName,
      duration: Math.min(duration, 6),
    });
  } catch {
    return NextResponse.json({ error: "Import failed" }, { status: 500 });
  }
}