/**
 * Puppeteer launch wrapper for cloakbrowser.
 * Alternative to the Playwright wrapper for users who prefer Puppeteer.
 */

import type { Browser } from "puppeteer-core";
import type { LaunchOptions } from "./types.js";
import { getDefaultStealthArgs } from "./config.js";
import { ensureBinary } from "./download.js";
import { parseProxyUrl } from "./proxy.js";

/**
 * Launch stealth Chromium browser via Puppeteer.
 *
 * @example
 * ```ts
 * import { launch } from 'cloakbrowser/puppeteer';
 * const browser = await launch();
 * const page = await browser.newPage();
 * await page.goto('https://bot.incolumitas.com');
 * console.log(await page.title());
 * await browser.close();
 * ```
 */
export async function launch(options: LaunchOptions = {}): Promise<Browser> {
  const puppeteer = await import("puppeteer-core");

  const binaryPath = process.env.CLOAKBROWSER_BINARY_PATH || (await ensureBinary());
  const resolved = await maybeResolveGeoip(options);
  const args = buildArgs({ ...options, ...resolved });

  // Puppeteer handles proxy via CLI args, not a separate option.
  // Chromium's --proxy-server does NOT support inline credentials,
  // so we strip them and use page.authenticate() instead.
  let proxyAuth: { username: string; password: string } | undefined;
  if (options.proxy) {
    const { server, username, password } = parseProxyUrl(options.proxy);
    args.push(`--proxy-server=${server}`);
    if (username) {
      proxyAuth = { username, password: password || "" };
    }
  }

  const browser = await puppeteer.default.launch({
    executablePath: binaryPath,
    headless: options.headless ?? true,
    args,
    ignoreDefaultArgs: ["--enable-automation"],
    ...options.launchOptions,
  });

  // Monkey-patch newPage() to auto-authenticate proxy credentials
  if (proxyAuth) {
    const origNewPage = browser.newPage.bind(browser);
    const auth = proxyAuth;
    browser.newPage = async (...pageArgs: Parameters<typeof origNewPage>) => {
      const page = await origNewPage(...pageArgs);
      await page.authenticate(auth);
      return page;
    };
  }

  return browser;
}

// ---------------------------------------------------------------------------
// Internal
// ---------------------------------------------------------------------------

async function maybeResolveGeoip(
  options: LaunchOptions
): Promise<{ timezone?: string; locale?: string }> {
  if (!options.geoip || !options.proxy) return { timezone: options.timezone, locale: options.locale };
  if (options.timezone && options.locale) return { timezone: options.timezone, locale: options.locale };

  const { resolveProxyGeo } = await import("./geoip.js");
  const { timezone: geoTz, locale: geoLocale } = await resolveProxyGeo(options.proxy);
  return {
    timezone: options.timezone ?? geoTz ?? undefined,
    locale: options.locale ?? geoLocale ?? undefined,
  };
}

function buildArgs(options: LaunchOptions): string[] {
  const args: string[] = [];
  if (options.stealthArgs !== false) {
    args.push(...getDefaultStealthArgs());
  }
  if (options.args) {
    args.push(...options.args);
  }
  if (options.timezone) {
    args.push(`--fingerprint-timezone=${options.timezone}`);
  }
  if (options.locale) {
    args.push(`--lang=${options.locale}`);
  }
  return args;
}