import * as fs from "node:fs";
import * as path from "node:path";

export type ProjectType = "nextjs" | "vite" | "hono" | "sveltekit" | "worker" | "unknown";

export interface WranglerConfig {
	name: string;
	main?: string;
	compatibility_date: string;
	assets?: {
		directory: string;
		binding?: string;
	};
}

const COMPATIBILITY_DATE = "2024-12-01";

export function generateWranglerConfig(
	projectType: ProjectType,
	projectName: string,
	entryPoint?: string,
): WranglerConfig {
	switch (projectType) {
		case "nextjs":
			return {
				name: projectName,
				main: ".open-next/worker.js",
				compatibility_date: COMPATIBILITY_DATE,
				assets: {
					directory: ".open-next/assets",
					binding: "ASSETS",
				},
			};

		case "vite":
			// Check if this is a Vite + Worker hybrid (has entryPoint)
			if (entryPoint) {
				// Hybrid mode: Vite frontend + custom Worker backend
				return {
					name: projectName,
					main: entryPoint,
					compatibility_date: COMPATIBILITY_DATE,
					assets: {
						directory: "./dist",
						binding: "ASSETS",
					},
				};
			}
			// Pure Vite SPAs use assets-only mode (no worker entry)
			// Cloudflare auto-generates a worker that serves static files
			return {
				name: projectName,
				compatibility_date: COMPATIBILITY_DATE,
				assets: {
					directory: "./dist",
				},
			};

		case "hono":
			return {
				name: projectName,
				main: entryPoint || "src/index.ts",
				compatibility_date: COMPATIBILITY_DATE,
			};

		case "sveltekit":
			return {
				name: projectName,
				compatibility_date: COMPATIBILITY_DATE,
				assets: {
					directory: "./.svelte-kit/cloudflare",
				},
			};

		default:
			return {
				name: projectName,
				main: entryPoint || "src/index.ts",
				compatibility_date: COMPATIBILITY_DATE,
			};
	}
}

export function writeWranglerConfig(projectPath: string, config: WranglerConfig): void {
	const header = "// wrangler.jsonc (auto-generated by jack)\n";
	const json = JSON.stringify(config, null, 2);
	const content = `${header}${json}\n`;
	const filePath = path.join(projectPath, "wrangler.jsonc");
	fs.writeFileSync(filePath, content, "utf-8");
}

export function getDefaultProjectName(projectPath: string): string {
	const packageJsonPath = path.join(projectPath, "package.json");

	if (fs.existsSync(packageJsonPath)) {
		try {
			const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, "utf-8"));
			if (packageJson.name && typeof packageJson.name === "string") {
				const slugified = slugify(packageJson.name);
				if (slugified) {
					return slugified;
				}
			}
		} catch {
			// Fall through to folder name
		}
	}

	const folderName = path.basename(path.resolve(projectPath));
	return slugify(folderName) || "my-project";
}

export function slugify(name: string): string {
	return name
		.toLowerCase()
		.replace(/[\s_]+/g, "-")
		.replace(/[^a-z0-9-]/g, "")
		.replace(/-+/g, "-")
		.replace(/^-+|-+$/g, "");
}