/**
 * Firefox cookie importer
 *
 * Reads cookies from Firefox's cookies.sqlite database.
 * Firefox stores cookies as plain unencrypted SQLite — no binary parsing needed.
 *
 * Database schema (moz_cookies table):
 *   id, originAttributes, name, value, host, path, expiry,
 *   lastAccessed, creationTime, isSecure, isHttpOnly,
 *   inBrowserElement, sameSite, rawSameSite, schemeMap
 *
 * Note: expiry is Unix seconds, but lastAccessed/creationTime are microseconds.
 *
 * Firefox holds an exclusive WAL lock while running, so we copy the database
 * files (cookies.sqlite + WAL + SHM) to a temp directory before reading.
 */

import { copyFileSync, existsSync, mkdtempSync, readFileSync, rmSync } from 'node:fs';
import { homedir, platform, tmpdir } from 'node:os';
import { join } from 'node:path';
import { DatabaseSync } from 'node:sqlite';

export interface FirefoxCookie {
  name: string;
  value: string;
  domain: string;
  path: string;
  expires: number; // Unix timestamp (seconds)
  secure: boolean;
  httpOnly: boolean;
  sameSite: 'None' | 'Lax' | 'Strict';
}

interface FirefoxProfile {
  name: string;
  path: string;
  isRelative: boolean;
  isDefault: boolean;
}

/**
 * Finalize a partial profile into a full FirefoxProfile if valid
 */
function finalizeProfile(partial: Partial<FirefoxProfile> | null): FirefoxProfile | null {
  if (!partial?.name || !partial?.path) return null;
  return {
    name: partial.name,
    path: partial.path,
    isRelative: partial.isRelative ?? true,
    isDefault: partial.isDefault ?? false,
  };
}

/**
 * Apply a key=value line to a partial profile
 */
function applyProfileField(profile: Partial<FirefoxProfile>, key: string, value: string): void {
  if (key === 'Name') profile.name = value;
  else if (key === 'Path') profile.path = value;
  else if (key === 'IsRelative') profile.isRelative = value === '1';
  else if (key === 'Default') profile.isDefault = value === '1';
}

/**
 * Process a single line of profiles.ini, updating state
 */
function processIniLine(
  line: string,
  current: Partial<FirefoxProfile> | null,
  profiles: FirefoxProfile[]
): Partial<FirefoxProfile> | null {
  const trimmed = line.trim();

  if (trimmed.startsWith('[Profile') || trimmed.startsWith('[Install')) {
    const finalized = finalizeProfile(current);
    if (finalized) profiles.push(finalized);
    return trimmed.startsWith('[Profile') ? {} : null;
  }

  if (current) {
    const eqIdx = trimmed.indexOf('=');
    if (eqIdx !== -1) applyProfileField(current, trimmed.slice(0, eqIdx), trimmed.slice(eqIdx + 1));
  }

  return current;
}

/**
 * Parse Firefox profiles.ini to find available profiles
 */
function parseProfilesIni(iniPath: string): FirefoxProfile[] {
  if (!existsSync(iniPath)) return [];

  const lines = readFileSync(iniPath, 'utf-8').split('\n');
  const profiles: FirefoxProfile[] = [];
  let current: Partial<FirefoxProfile> | null = null;

  for (const line of lines) {
    current = processIniLine(line, current, profiles);
  }

  const last = finalizeProfile(current);
  if (last) profiles.push(last);

  return profiles;
}

/**
 * Get the Firefox profiles root directory for the current platform
 */
function getFirefoxRoot(): string {
  const home = homedir();

  switch (platform()) {
    case 'darwin':
      return join(home, 'Library/Application Support/Firefox');
    case 'linux':
      return join(home, '.mozilla/firefox');
    case 'win32':
      return join(process.env.APPDATA || join(home, 'AppData/Roaming'), 'Mozilla/Firefox');
    default:
      throw new Error(`Unsupported platform: ${platform()}`);
  }
}

/**
 * List available Firefox profiles
 */
export function listFirefoxProfiles(): FirefoxProfile[] {
  const root = getFirefoxRoot();
  const iniPath = join(root, 'profiles.ini');
  return parseProfilesIni(iniPath);
}

/**
 * Resolve a FirefoxProfile to its absolute path
 */
function profileToAbsolutePath(root: string, p: FirefoxProfile): string {
  return p.isRelative ? join(root, p.path) : p.path;
}

/**
 * Resolve the full path to a Firefox profile directory
 */
function resolveProfilePath(profile?: string): string {
  const root = getFirefoxRoot();
  const profiles = listFirefoxProfiles();

  if (!profile) {
    const defaultProfile = profiles.find((p) => p.isDefault) || profiles[0];
    if (!defaultProfile) throw new Error('No Firefox profiles found. Is Firefox installed?');
    return profileToAbsolutePath(root, defaultProfile);
  }

  // Try exact match by name or path
  const match = profiles.find((p) => p.name === profile || p.path === profile);
  if (match) return profileToAbsolutePath(root, match);

  // Try as direct path fragment in Profiles dir
  const directPath = join(root, 'Profiles', profile);
  if (existsSync(directPath)) return directPath;

  // Try as absolute path
  if (existsSync(profile)) return profile;

  const available = profiles.map((p) => p.name).join(', ');
  throw new Error(`Firefox profile not found: "${profile}". Available: ${available}`);
}

/**
 * Safely copy the Firefox cookies database to a temp directory.
 * Copies cookies.sqlite + WAL + SHM files to avoid lock conflicts.
 */
function copyDatabaseSafely(dbPath: string): { tmpDir: string; tmpDbPath: string } {
  if (!existsSync(dbPath)) {
    throw new Error(
      `Firefox cookies database not found at: ${dbPath}\nMake sure Firefox has been used at least once.`
    );
  }

  const tmpDir = mkdtempSync(join(tmpdir(), 'browse-fx-'));
  const dbName = 'cookies.sqlite';

  try {
    // Copy main database
    copyFileSync(dbPath, join(tmpDir, dbName));

    // Copy WAL and SHM if they exist (needed for up-to-date reads)
    for (const ext of ['-wal', '-shm']) {
      const src = `${dbPath}${ext}`;
      if (existsSync(src)) {
        copyFileSync(src, join(tmpDir, `${dbName}${ext}`));
      }
    }

    return { tmpDir, tmpDbPath: join(tmpDir, dbName) };
  } catch (err) {
    // Clean up on failure
    rmSync(tmpDir, { recursive: true, force: true });
    throw err;
  }
}

/**
 * Convert Firefox sameSite integer to string
 * 0 = None, 1 = Lax, 2 = Strict
 */
function sameSiteToString(value: number): 'None' | 'Lax' | 'Strict' {
  switch (value) {
    case 2:
      return 'Strict';
    case 1:
      return 'Lax';
    default:
      return 'None';
  }
}

/**
 * Import cookies from Firefox's cookies.sqlite database
 */
export function importFirefoxCookies(options?: {
  profile?: string;
  domain?: string;
}): FirefoxCookie[] {
  const profilePath = resolveProfilePath(options?.profile);
  const dbPath = join(profilePath, 'cookies.sqlite');
  const { tmpDir, tmpDbPath } = copyDatabaseSafely(dbPath);

  try {
    const db = new DatabaseSync(tmpDbPath, { readOnly: true });

    let query =
      'SELECT name, value, host, path, expiry, isSecure, isHttpOnly, sameSite FROM moz_cookies';
    const params: string[] = [];

    if (options?.domain) {
      const domain = options.domain.toLowerCase();
      query += ' WHERE LOWER(host) = ? OR LOWER(host) = ? OR LOWER(host) LIKE ?';
      params.push(domain, `.${domain}`, `%.${domain}`);
    }

    const stmt = db.prepare(query);
    const rows = params.length > 0 ? stmt.all(...params) : stmt.all();
    db.close();

    return (rows as Record<string, unknown>[]).map((row) => ({
      name: row.name as string,
      value: row.value as string,
      domain: row.host as string,
      path: row.path as string,
      expires: row.expiry as number,
      secure: (row.isSecure as number) === 1,
      httpOnly: (row.isHttpOnly as number) === 1,
      sameSite: sameSiteToString(row.sameSite as number),
    }));
  } finally {
    rmSync(tmpDir, { recursive: true, force: true });
  }
}

/**
 * Convert FirefoxCookie to Playwright cookie format
 */
export function toPlaywrightCookie(cookie: FirefoxCookie): {
  name: string;
  value: string;
  domain: string;
  path: string;
  expires: number;
  secure: boolean;
  httpOnly: boolean;
  sameSite: 'Strict' | 'Lax' | 'None';
} {
  return {
    name: cookie.name,
    value: cookie.value,
    domain: cookie.domain,
    path: cookie.path,
    expires: cookie.expires,
    secure: cookie.secure,
    httpOnly: cookie.httpOnly,
    sameSite: cookie.sameSite,
  };
}