#!/usr/bin/env ts-node
/**
 * Standalone Scrapling CLI runner — no n8n needed.
 *
 * Usage:
 *   npx ts-node scripts/scrapling-run.ts <url> [options]
 *
 * Options:
 *   --fetcher  http|stealth|dynamic  (default: http)
 *   --selector <name>:<css-selector> (can be repeated)
 *   --html                           include raw HTML in output
 *   --wait     <css-selector>        wait for selector (dynamic only)
 *   --timeout  <ms>                  (default: 30000)
 *   --format   pretty|json           (default: pretty)
 *   --service  <url>                 service URL override
 *
 * Credentials (from .env.test or environment):
 *   SCRAPLING_SERVICE_URL   default: http://localhost:8765
 *   SCRAPLING_API_KEY       optional
 *
 * Examples:
 *   npx ts-node scripts/scrapling-run.ts https://example.com
 *   npx ts-node scripts/scrapling-run.ts https://news.ycombinator.com --fetcher stealth --selector "title:title"
 *   npx ts-node scripts/scrapling-run.ts https://spa.example.com --fetcher dynamic --wait "#app"
 */

import * as https from 'https';
import * as http from 'http';
import * as path from 'path';
import * as fs from 'fs';

// ── Load .env.test if present ─────────────────────────────────────────────────

const envFile = path.resolve(__dirname, '..', '.env.test');
if (fs.existsSync(envFile)) {
	const lines = fs.readFileSync(envFile, 'utf-8').split('\n');
	for (const line of lines) {
		const trimmed = line.trim();
		if (!trimmed || trimmed.startsWith('#')) continue;
		const eq = trimmed.indexOf('=');
		if (eq === -1) continue;
		const key = trimmed.slice(0, eq).trim();
		const value = trimmed.slice(eq + 1).trim().replace(/^["']|["']$/g, '');
		if (!process.env[key]) process.env[key] = value;
	}
}

// ── Parse CLI args ────────────────────────────────────────────────────────────

const args = process.argv.slice(2);
const url = args.find((a) => !a.startsWith('--'));

if (!url) {
	console.error('Usage: scrapling-run.ts <url> [--fetcher http|stealth|dynamic] [--selector name:selector] ...');
	process.exit(1);
}

function getArg(flag: string): string | undefined {
	const idx = args.indexOf(flag);
	return idx !== -1 ? args[idx + 1] : undefined;
}

function getFlag(flag: string): boolean {
	return args.includes(flag);
}

function getArgs(flag: string): string[] {
	const result: string[] = [];
	for (let i = 0; i < args.length; i++) {
		if (args[i] === flag && args[i + 1]) {
			result.push(args[i + 1]);
			i++;
		}
	}
	return result;
}

const fetcherType = (getArg('--fetcher') ?? 'http') as 'http' | 'stealth' | 'dynamic';
const returnHtml = getFlag('--html');
const waitSelector = getArg('--wait');
const timeout = parseInt(getArg('--timeout') ?? '30000', 10);
const outputFormat = (getArg('--format') ?? 'pretty') as 'pretty' | 'json';
const serviceUrl = (getArg('--service') ?? process.env.SCRAPLING_SERVICE_URL ?? 'http://localhost:8765').replace(/\/$/, '');
const apiKey = process.env.SCRAPLING_API_KEY ?? '';

const rawSelectors = getArgs('--selector');
const selectors = rawSelectors.map((raw) => {
	const colonIdx = raw.indexOf(':');
	if (colonIdx === -1) {
		console.error(`Invalid selector format: "${raw}". Expected "name:selector"`);
		process.exit(1);
	}
	return {
		name: raw.slice(0, colonIdx),
		selector: raw.slice(colonIdx + 1),
		selector_type: 'css' as const,
		multiple: false,
	};
});

// ── Minimal HTTP client ───────────────────────────────────────────────────────

function postJson(reqUrl: string, body: unknown, headers: Record<string, string>): Promise<unknown> {
	return new Promise((resolve, reject) => {
		const bodyStr = JSON.stringify(body);
		const parsed = new URL(reqUrl);
		const isHttps = parsed.protocol === 'https:';
		const transport = isHttps ? https : http;

		const req = transport.request(
			{
				hostname: parsed.hostname,
				port: parsed.port || (isHttps ? 443 : 80),
				path: parsed.pathname + parsed.search,
				method: 'POST',
				headers: {
					'Content-Type': 'application/json',
					'Content-Length': Buffer.byteLength(bodyStr).toString(),
					...headers,
				},
			},
			(res) => {
				const chunks: Buffer[] = [];
				res.on('data', (c: Buffer) => chunks.push(c));
				res.on('end', () => {
					const text = Buffer.concat(chunks).toString('utf-8');
					if (res.statusCode && res.statusCode >= 400) {
						reject(Object.assign(new Error(`HTTP ${res.statusCode}: ${text}`), { statusCode: res.statusCode }));
					} else {
						try {
							resolve(JSON.parse(text));
						} catch {
							resolve(text);
						}
					}
				});
			},
		);
		req.on('error', reject);
		req.write(bodyStr);
		req.end();
	});
}

// ── Main ──────────────────────────────────────────────────────────────────────

interface ScrapeResponse {
	url: string;
	status_code: number;
	html?: string;
	data: Record<string, unknown>;
	fetcher_used: string;
	elapsed_ms: number;
	error?: string;
}

async function main(): Promise<void> {
	console.log(`Service: ${serviceUrl}`);
	console.log(`URL:     ${url}`);
	console.log(`Fetcher: ${fetcherType}`);
	if (selectors.length) console.log(`Selectors: ${selectors.map((s) => `${s.name}:${s.selector}`).join(', ')}`);
	console.log();

	const payload: Record<string, unknown> = {
		url,
		fetcher_type: fetcherType,
		return_html: returnHtml,
		timeout,
		selectors,
	};

	if (waitSelector) payload.wait_selector = waitSelector;

	const requestHeaders: Record<string, string> = {};
	if (apiKey) requestHeaders['X-API-Key'] = apiKey;

	const response = (await postJson(`${serviceUrl}/scrape`, payload, requestHeaders)) as ScrapeResponse;

	if (outputFormat === 'json') {
		console.log(JSON.stringify(response, null, 2));
		return;
	}

	// Pretty output
	console.log(`Status:  ${response.status_code}`);
	console.log(`Fetcher: ${response.fetcher_used}`);
	console.log(`Elapsed: ${response.elapsed_ms}ms`);

	if (response.error) {
		console.error(`\nError: ${response.error}`);
		return;
	}

	if (Object.keys(response.data).length > 0) {
		console.log('\nExtracted data:');
		console.log('─'.repeat(50));
		for (const [key, val] of Object.entries(response.data)) {
			const display = Array.isArray(val) ? `[${(val as unknown[]).length} items]` : String(val);
			console.log(`  ${key.padEnd(25)} ${display}`);
		}
	}

	if (response.html) {
		console.log('\nHTML preview (first 500 chars):');
		console.log('─'.repeat(50));
		console.log(response.html.slice(0, 500));
	}
}

main().catch((err) => {
	console.error('\nError:', (err as Error).message ?? err);
	process.exit(1);
});