import { Command } from "@effect/cli";
import { Console, Effect } from "effect";
import * as readline from "node:readline";
import * as fs from "node:fs";
import * as path from "node:path";
import * as os from "node:os";

export const CONFIG_DIR = path.join(os.homedir(), ".config", "plane");
export const CONFIG_FILE = path.join(CONFIG_DIR, "config.json");

export interface PlaneConfig {
	token: string;
	host: string;
	workspace: string;
}

function prompt(rl: readline.Interface, question: string): Promise<string> {
	return new Promise((resolve) => rl.question(question, resolve));
}

export const init = Command.make("init", {}, () =>
	Effect.gen(function* () {
		let existing: Partial<PlaneConfig> = {};
		try {
			existing = JSON.parse(fs.readFileSync(CONFIG_FILE, "utf8"));
		} catch {
			// no existing config
		}

		const rl = readline.createInterface({
			input: process.stdin,
			output: process.stdout,
		});

		const host = yield* Effect.promise(() =>
			prompt(rl, `Plane host [${existing.host ?? "https://plane.so"}]: `),
		);
		const workspace = yield* Effect.promise(() =>
			prompt(rl, `Workspace slug [${existing.workspace ?? ""}]: `),
		);
		const token = yield* Effect.promise(() =>
			prompt(rl, `API token [${existing.token ? "***" : ""}]: `),
		);

		rl.close();

		const config: PlaneConfig = {
			host: host.trim() || existing.host || "https://plane.so",
			workspace: workspace.trim() || existing.workspace || "",
			token: token.trim() || existing.token || "",
		};

		if (!config.token) {
			yield* Effect.fail(new Error("API token is required"));
		}
		if (!config.workspace) {
			yield* Effect.fail(new Error("Workspace slug is required"));
		}

		fs.mkdirSync(CONFIG_DIR, { recursive: true });
		fs.writeFileSync(CONFIG_FILE, JSON.stringify(config, null, 2) + "\n", {
			mode: 0o600,
		});

		yield* Console.log(`\nConfig saved to ${CONFIG_FILE}`);
		yield* Console.log(`  Host:      ${config.host}`);
		yield* Console.log(`  Workspace: ${config.workspace}`);
		yield* Console.log(`  Token:     ***`);
	}),
).pipe(
	Command.withDescription(
		"Interactive setup. Prompts for host, workspace slug, and API token, then saves to ~/.config/plane/config.json (mode 0600). Safe to re-run — existing values shown as defaults.",
	),
);