import { NextRequest, NextResponse } from "next/server";
import { readFile } from "fs/promises";
import { existsSync } from "fs";
import path from "path";
import db from "@/lib/db";

export async function GET(request, { params }) {
	try {
		const { filename } = params;

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

		// Get template info from database
		const template = db.prepare(`
			SELECT * FROM docx_templates WHERE stored_filename = ? AND is_active = 1
		`).get(filename);

		if (!template) {
			return NextResponse.json(
				{ error: "Template not found" },
				{ status: 404 }
			);
		}

		// Check if file exists
		const filePath = path.join(process.cwd(), "templates", filename);
		if (!existsSync(filePath)) {
			return NextResponse.json(
				{ error: "Template file not found" },
				{ status: 404 }
			);
		}

		// Read file
		const fileBuffer = await readFile(filePath);

		// Return file with proper headers
		const response = new NextResponse(fileBuffer, {
			status: 200,
			headers: {
				"Content-Type": template.mime_type || "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
				"Content-Disposition": `attachment; filename="${template.original_filename}"`,
				"Content-Length": fileBuffer.length.toString(),
			},
		});

		return response;

	} catch (error) {
		console.error("Template download error:", error);
		return NextResponse.json(
			{ error: "Failed to download template" },
			{ status: 500 }
		);
	}
}