// Cookie management for Epic Games
// Based on https://github.com/claabs/epicgames-freegames-node

import fs from 'node:fs';
import path from 'node:path';
import tough from 'tough-cookie';
import { filenamify } from './util.js';
import { dataDir } from './util.js';

const CONFIG_DIR = dataDir('config');
const DEFAULT_COOKIE_NAME = 'default';

// Ensure config directory exists
if (!fs.existsSync(CONFIG_DIR)) {
  fs.mkdirSync(CONFIG_DIR, { recursive: true });
}

function getCookiePath(username) {
  const fileSafeUsername = filenamify(username);
  const cookieFilename = path.join(CONFIG_DIR, `${fileSafeUsername}-cookies.json`);
  return cookieFilename;
}

// Cookie whitelist - only these cookies are stored
const COOKIE_WHITELIST = ['EPIC_SSO_RM', 'EPIC_SESSION_AP', 'EPIC_DEVICE'];

// Cookie jar cache
const cookieJars = new Map();

function getCookieJar(username) {
  let cookieJar = cookieJars.get(username);
  if (cookieJar) {
    return cookieJar;
  }
  const cookieFilename = getCookiePath(username);
  cookieJar = new tough.CookieJar();
  cookieJars.set(username, cookieJar);
  return cookieJar;
}

// Convert EditThisCookie format to tough-cookie file store format
export function editThisCookieToToughCookieFileStore(etc) {
  const tcfs = {};
  
  etc.forEach((etcCookie) => {
    const domain = etcCookie.domain.replace(/^\./, '');
    const expires = etcCookie.expirationDate
      ? new Date(etcCookie.expirationDate * 1000).toISOString()
      : undefined;
    const { path: cookiePath, name } = etcCookie;

    if (COOKIE_WHITELIST.includes(name)) {
      const temp = {
        [domain]: {
          [cookiePath]: {
            [name]: {
              key: name,
              value: etcCookie.value,
              expires,
              domain,
              path: cookiePath,
              secure: etcCookie.secure,
              httpOnly: etcCookie.httpOnly,
              hostOnly: etcCookie.hostOnly,
            },
          },
        },
      };
      Object.assign(tcfs, temp);
    }
  });
  
  return tcfs;
}

// Get cookies as simple object
export function getCookies(username) {
  const cookieJar = getCookieJar(username);
  const cookies = cookieJar.toJSON()?.cookies || [];
  return cookies.reduce((accum, cookie) => {
    if (cookie.key && cookie.value) {
      return { ...accum, [cookie.key]: cookie.value };
    }
    return accum;
  }, {});
}

// Get raw cookies in tough-cookie file store format
export async function getCookiesRaw(username) {
  const cookieFilename = getCookiePath(username);
  try {
    const existingCookies = JSON.parse(fs.readFileSync(cookieFilename, 'utf8'));
    return existingCookies;
  } catch {
    return {};
  }
}

// Set cookies from Playwright/Cookie format
export async function setPuppeteerCookies(username, newCookies) {
  const cookieJar = getCookieJar(username);
  
  for (const cookie of newCookies) {
    const domain = cookie.domain.replace(/^\./, '');
    const tcfsCookie = new tough.Cookie({
      key: cookie.name,
      value: cookie.value,
      expires: cookie.expires ? new Date(cookie.expires * 1000) : undefined,
      domain,
      path: cookie.path,
      secure: cookie.secure,
      httpOnly: cookie.httpOnly,
      hostOnly: !cookie.domain.startsWith('.'),
    });
    
    try {
      await cookieJar.setCookie(tcfsCookie, `https://${domain}`);
    } catch (err) {
      console.error('Error setting cookie:', err);
    }
  }
}

// Delete cookies for a user
export async function deleteCookies(username) {
  const cookieFilename = getCookiePath(username || DEFAULT_COOKIE_NAME);
  try {
    fs.unlinkSync(cookieFilename);
  } catch {
    // File doesn't exist, that's fine
  }
}

// Check if user has a valid cookie
export async function userHasValidCookie(username, cookieName) {
  const cookieFilename = getCookiePath(username);
  try {
    const fileExists = fs.existsSync(cookieFilename);
    if (!fileExists) return false;
    
    const cookieData = JSON.parse(fs.readFileSync(cookieFilename, 'utf8'));
    const rememberCookieExpireDate = cookieData['epicgames.com']?.['/']?.[cookieName]?.expires;
    if (!rememberCookieExpireDate) return false;
    
    return new Date(rememberCookieExpireDate) > new Date();
  } catch {
    return false;
  }
}

// Convert imported cookies (EditThisCookie format)
export async function convertImportCookies(username) {
  const cookieFilename = getCookiePath(username);
  const fileExists = fs.existsSync(cookieFilename);
  
  if (fileExists) {
    try {
      const cookieData = fs.readFileSync(cookieFilename, 'utf8');
      const cookieTest = JSON.parse(cookieData);
      
      if (Array.isArray(cookieTest)) {
        // Convert from EditThisCookie format
        const tcfsCookies = editThisCookieToToughCookieFileStore(cookieTest);
        fs.writeFileSync(cookieFilename, JSON.stringify(tcfsCookies, null, 2));
      }
    } catch {
      // Invalid format, delete file
      fs.unlinkSync(cookieFilename);
    }
  }
}