import { NextRequest, NextResponse } from "next/server";
import { writeFile, mkdir } from "fs/promises";
import { join } from "path";
import { existsSync } from "fs";
import { SAVE_CONFIG } from "@/lib/saveConfig";

export async function POST(request: NextRequest) {
	try {
		// Check if saving is enabled
		if (!SAVE_CONFIG.ENABLE_SAVE) {
			return NextResponse.json(
				{ error: "Script saving is disabled" },
				{ status: 403 }
			);
		}

		const { name, content, secret } = await request.json();

		// Validate secret
		if (secret !== SAVE_CONFIG.SAVE_SECRET) {
			return NextResponse.json(
				{ error: "Invalid save secret" },
				{ status: 401 }
			);
		}

		// Validate required fields
		if (!name || !content) {
			return NextResponse.json(
				{ error: "Name and content are required" },
				{ status: 400 }
			);
		}

		// Validate filename
		if (name.length > SAVE_CONFIG.MAX_FILENAME_LENGTH) {
			return NextResponse.json(
				{
					error: `Filename must be ${SAVE_CONFIG.MAX_FILENAME_LENGTH} characters or less`,
				},
				{ status: 400 }
			);
		}

		if (!SAVE_CONFIG.FILENAME_REGEX.test(name)) {
			return NextResponse.json(
				{
					error: "Filename can only contain alphanumerics, underscores, spaces, and hyphens",
				},
				{ status: 400 }
			);
		}

		// Ensure save directory exists
		const saveDir = join(process.cwd(), SAVE_CONFIG.SAVE_DIRECTORY);
		if (!existsSync(saveDir)) {
			await mkdir(saveDir, { recursive: true });
		}

		// Check if file already exists
		const filename = `${name}.rhai`;
		const filepath = join(saveDir, filename);

		if (existsSync(filepath)) {
			return NextResponse.json(
				{ error: `A script named "${name}" already exists` },
				{ status: 409 }
			);
		}

		// Save the file
		await writeFile(filepath, content, "utf8");

		return NextResponse.json({
			success: true,
			message: `Script saved as ${filename}`,
			filename,
		});
	} catch (error) {
		console.error("Save script error:", error);
		return NextResponse.json(
			{ error: "Failed to save script" },
			{ status: 500 }
		);
	}
}