import { execFileSync, spawn } from 'child_process';
import { setTimeout as sleep } from 'timers/promises';
import { find_claude_window } from './find-window.js';

export async function copy_to_clipboard(text) {
	await new Promise((resolve, reject) => {
		const proc = spawn('xclip', ['-selection', 'clipboard'], { stdio: ['pipe', 'ignore', 'ignore'] });
		proc.on('error', reject);
		proc.on('close', code => code === 0 ? resolve() : reject(new Error(`xclip exited ${code}`)));
		proc.stdin.write(text);
		proc.stdin.end();
	});
}

export function focus_window(window_id) {
	execFileSync('xdotool', ['windowactivate', '--sync', window_id]);
}

export async function paste_to_window(window_id, { submit = true } = {}) {
	execFileSync('xdotool', ['windowactivate', '--sync', window_id]);
	execFileSync('xdotool', ['key', '--window', window_id, 'shift+Insert']);
	if (submit) {
		await sleep(200);
		execFileSync('xdotool', ['key', '--window', window_id, 'Return']);
	}
}

function normalise_window_id(raw) {
	// Accept decimal (25165857) or hex (0x1800021) — always return 0x hex string
	const n = raw.startsWith('0x') ? parseInt(raw, 16) : parseInt(raw, 10);
	return '0x' + n.toString(16);
}

export async function send_to_claude(text, options = {}) {
	const window_id = options.window_id
		? normalise_window_id(String(options.window_id))
		: find_claude_window({ debug: options.debug });
	if (!window_id) {
		throw new Error('Could not find Claude Code window');
	}
	console.error(`[send] using window ${window_id}`);
	if (options.focus_only) {
		focus_window(window_id);
		return window_id;
	}
	await copy_to_clipboard(text);
	await paste_to_window(window_id, options);
	return window_id;
}