import { NextRequest, NextResponse } from "next/server";
import { requireAuth } from "@/lib/auth";
import { writeFile } from "fs/promises";
import path from "path";

const MAX_SIZE = 10 * 1024 * 1024; // 10 MB
const ALLOWED_MIME = [
  "image/jpeg",
  "image/png",
  "image/gif",
  "image/webp",
  "application/pdf",
  "application/zip",
  "application/x-zip-compressed",
  "application/x-rar-compressed",
  "application/x-7z-compressed",
  "application/gzip",
];

// POST /api/souq/upload — upload a delivery file
export async function POST(request: NextRequest) {
  try {
    const auth = await requireAuth(request);
    if (!auth) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const formData = await request.formData();
    const file = formData.get("file") as File | null;
    const orderId = formData.get("orderId") as string | null;

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

    if (!orderId) {
      return NextResponse.json(
        { error: "orderId is required" },
        { status: 400 }
      );
    }

    // Check file size
    if (file.size > MAX_SIZE) {
      return NextResponse.json(
        { error: "File too large. Maximum 10 MB." },
        { status: 413 }
      );
    }

    // Only check mime type if available; allow fallback for unknown types
    if (file.type && !ALLOWED_MIME.includes(file.type)) {
      return NextResponse.json(
        {
          error:
            "Invalid file type. Allowed: images, PDFs, ZIP, RAR, 7z, GZIP.",
        },
        { status: 400 }
      );
    }

    // Generate unique filename
    const timestamp = Date.now();
    const safeName = file.name.replace(/[^a-zA-Z0-9._-]/g, "_");
    const fileName = `${orderId}-${timestamp}-${safeName}`;

    // Save to disk
    const uploadDir = path.join(
      process.cwd(),
      "public",
      "uploads",
      "deliveries"
    );
    const filePath = path.join(uploadDir, fileName);
    const buffer = Buffer.from(await file.arrayBuffer());
    await writeFile(filePath, buffer);

    // Return the public URL path
    const url = `/uploads/deliveries/${fileName}`;

    return NextResponse.json({
      url,
      name: file.name,
      size: file.size,
    });
  } catch (error) {
    console.error("POST /api/souq/upload error:", error);
    return NextResponse.json(
      { error: "Internal server error" },
      { status: 500 }
    );
  }
}