import { NextRequest, NextResponse } from "next/server";
import fs from "fs/promises";
import path from "path";
import { v4 as uuidv4 } from "uuid";
import {
  DEFAULT_ANIMATION,
  DEFAULT_LAYOUT,
  DEFAULT_STYLE,
} from "@/lib/defaults";
import { extractVideoMeta } from "@/lib/ffmpeg";
import {
  ensureStorageDirs,
  saveProject,
  uploadDir,
  videoPath,
} from "@/lib/storage";
import type { Project } from "@/types";

export const runtime = "nodejs";
export const maxDuration = 120;

const MAX_SIZE = 500 * 1024 * 1024;
const MAX_DURATION = 5 * 60;

export async function POST(req: NextRequest) {
  try {
    await ensureStorageDirs();
    const formData = await req.formData();
    const file = formData.get("video");

    if (!file || !(file instanceof File)) {
      return NextResponse.json({ error: "No video file provided" }, { status: 400 });
    }

    if (file.size > MAX_SIZE) {
      return NextResponse.json({ error: "File exceeds 500MB limit" }, { status: 400 });
    }

    const id = uuidv4();
    const dir = uploadDir(id);
    await fs.mkdir(dir, { recursive: true });

    const ext = path.extname(file.name).toLowerCase() || ".mp4";
    const savedPath = path.join(dir, `video${ext}`);
    const buffer = Buffer.from(await file.arrayBuffer());
    await fs.writeFile(savedPath, buffer);

    const mp4Path = videoPath(id);
    if (savedPath !== mp4Path) {
      await fs.copyFile(savedPath, mp4Path);
    }

    const videoMeta = await extractVideoMeta(mp4Path);
    if (videoMeta.duration > MAX_DURATION) {
      await fs.rm(dir, { recursive: true, force: true });
      return NextResponse.json({ error: "Video exceeds 5 minute limit" }, { status: 400 });
    }

    const project: Project = {
      id,
      videoPath: mp4Path,
      videoMeta,
      captions: [],
      style: DEFAULT_STYLE,
      layout: DEFAULT_LAYOUT,
      animation: DEFAULT_ANIMATION,
      status: "draft",
      createdAt: new Date().toISOString(),
    };

    await saveProject(project);

    return NextResponse.json({ id, meta: videoMeta });
  } catch (error) {
    console.error("Upload error:", error);
    return NextResponse.json(
      { error: error instanceof Error ? error.message : "Upload failed" },
      { status: 500 },
    );
  }
}