/**
 * ============================================================
 * DUTCHIE PLATFORM CLIENT - LOCKED MODULE
 * ============================================================
 *
 * DO NOT MODIFY THIS FILE WITHOUT EXPLICIT AUTHORIZATION.
 *
 * This is the canonical HTTP client for all Dutchie communication.
 * All Dutchie workers (Alice, Bella, etc.) MUST use this client.
 *
 * IMPLEMENTATION:
 * - Uses curl via child_process.execSync (bypasses TLS fingerprinting)
 * - NO Puppeteer, NO axios, NO fetch
 * - Fingerprint rotation on 403
 * - Residential IP compatible
 *
 * USAGE:
 *   import { curlPost, curlGet, executeGraphQL } from '@dutchie/client';
 *
 * ============================================================
 */

import { execSync } from 'child_process';

// ============================================================
// TYPES
// ============================================================

export interface CurlResponse {
  status: number;
  data: any;
  error?: string;
}

export interface Fingerprint {
  userAgent: string;
  acceptLanguage: string;
  secChUa?: string;
  secChUaPlatform?: string;
  secChUaMobile?: string;
}

// ============================================================
// CONFIGURATION
// ============================================================

export const DUTCHIE_CONFIG = {
  graphqlEndpoint: 'https://dutchie.com/api-3/graphql',
  baseUrl: 'https://dutchie.com',
  timeout: 30000,
  maxRetries: 3,
  perPage: 100,
  maxPages: 200,
  pageDelayMs: 500,
  modeDelayMs: 2000,
};

// ============================================================
// PROXY SUPPORT
// ============================================================
// Integrates with the CrawlRotator system from proxy-rotator.ts
// On 403 errors:
// 1. Record failure on current proxy
// 2. Rotate to next proxy
// 3. Retry with new proxy
// ============================================================

import type { CrawlRotator, Proxy } from '../../services/crawl-rotator';

let currentProxy: string | null = null;
let crawlRotator: CrawlRotator | null = null;

/**
 * Set proxy for all Dutchie requests
 * Format: http://user:pass@host:port or socks5://host:port
 */
export function setProxy(proxy: string | null): void {
  currentProxy = proxy;
  if (proxy) {
    console.log(`[Dutchie Client] Proxy set: ${proxy.replace(/:[^:@]+@/, ':***@')}`);
  } else {
    console.log('[Dutchie Client] Proxy disabled (direct connection)');
  }
}

/**
 * Get current proxy URL
 */
export function getProxy(): string | null {
  return currentProxy;
}

/**
 * Set CrawlRotator for proxy rotation on 403s
 * This enables automatic proxy rotation when blocked
 */
export function setCrawlRotator(rotator: CrawlRotator | null): void {
  crawlRotator = rotator;
  if (rotator) {
    console.log('[Dutchie Client] CrawlRotator attached - proxy rotation enabled');
    // Set initial proxy from rotator
    const proxy = rotator.proxy.getCurrent();
    if (proxy) {
      currentProxy = rotator.proxy.getProxyUrl(proxy);
      console.log(`[Dutchie Client] Initial proxy: ${currentProxy.replace(/:[^:@]+@/, ':***@')}`);
    }
  }
}

/**
 * Get attached CrawlRotator
 */
export function getCrawlRotator(): CrawlRotator | null {
  return crawlRotator;
}

/**
 * Rotate to next proxy (called on 403)
 */
async function rotateProxyOn403(error?: string): Promise<boolean> {
  if (!crawlRotator) {
    return false;
  }

  // Record failure on current proxy
  await crawlRotator.recordFailure(error || '403 Forbidden');

  // Rotate to next proxy
  const nextProxy = crawlRotator.rotateProxy();
  if (nextProxy) {
    currentProxy = crawlRotator.proxy.getProxyUrl(nextProxy);
    console.log(`[Dutchie Client] Rotated proxy: ${currentProxy.replace(/:[^:@]+@/, ':***@')}`);
    return true;
  }

  console.warn('[Dutchie Client] No more proxies available');
  return false;
}

/**
 * Record success on current proxy
 */
async function recordProxySuccess(responseTimeMs?: number): Promise<void> {
  if (crawlRotator) {
    await crawlRotator.recordSuccess(responseTimeMs);
  }
}

/**
 * Build curl proxy argument
 */
function getProxyArg(): string {
  if (!currentProxy) return '';
  return `--proxy '${currentProxy}'`;
}

export const GRAPHQL_HASHES = {
  FilteredProducts: 'ee29c060826dc41c527e470e9ae502c9b2c169720faa0a9f5d25e1b9a530a4a0',
  GetAddressBasedDispensaryData: '13461f73abf7268770dfd05fe7e10c523084b2bb916a929c08efe3d87531977b',
  ConsumerDispensaries: '0a5bfa6ca1d64ae47bcccb7c8077c87147cbc4e6982c17ceec97a2a4948b311b',
  DispensaryInfo: '13461f73abf7268770dfd05fe7e10c523084b2bb916a929c08efe3d87531977b',
  GetAllCitiesByState: 'ae547a0466ace5a48f91e55bf6699eacd87e3a42841560f0c0eabed5a0a920e6',
};

// ============================================================
// FINGERPRINTS - Browser profiles for anti-detect
// ============================================================

const FINGERPRINTS: Fingerprint[] = [
  // Chrome Windows (latest) - typical residential user, use first
  {
    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36',
    acceptLanguage: 'en-US,en;q=0.9',
    secChUa: '"Google Chrome";v="131", "Chromium";v="131", "Not_A Brand";v="24"',
    secChUaPlatform: '"Windows"',
    secChUaMobile: '?0',
  },
  // Chrome Mac (latest)
  {
    userAgent: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36',
    acceptLanguage: 'en-US,en;q=0.9',
    secChUa: '"Google Chrome";v="131", "Chromium";v="131", "Not_A Brand";v="24"',
    secChUaPlatform: '"macOS"',
    secChUaMobile: '?0',
  },
  // Chrome Windows (120)
  {
    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
    acceptLanguage: 'en-US,en;q=0.9',
    secChUa: '"Chromium";v="120", "Google Chrome";v="120", "Not-A.Brand";v="99"',
    secChUaPlatform: '"Windows"',
    secChUaMobile: '?0',
  },
  // Firefox Windows
  {
    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0',
    acceptLanguage: 'en-US,en;q=0.5',
  },
  // Safari Mac
  {
    userAgent: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 14_2) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.2 Safari/605.1.15',
    acceptLanguage: 'en-US,en;q=0.9',
  },
  // Edge Windows
  {
    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0',
    acceptLanguage: 'en-US,en;q=0.9',
    secChUa: '"Microsoft Edge";v="131", "Chromium";v="131", "Not_A Brand";v="24"',
    secChUaPlatform: '"Windows"',
    secChUaMobile: '?0',
  },
];

let currentFingerprintIndex = 0;

// Forward declaration for session (actual CrawlSession interface defined later)
let currentSession: {
  sessionId: string;
  fingerprint: Fingerprint;
  proxyUrl: string | null;
  stateCode?: string;
  timezone?: string;
  startedAt: Date;
} | null = null;

/**
 * Get current fingerprint - returns session fingerprint if active, otherwise default
 */
export function getFingerprint(): Fingerprint {
  // Use session fingerprint if a session is active
  if (currentSession) {
    return currentSession.fingerprint;
  }
  return FINGERPRINTS[currentFingerprintIndex];
}

export function rotateFingerprint(): Fingerprint {
  currentFingerprintIndex = (currentFingerprintIndex + 1) % FINGERPRINTS.length;
  const fp = FINGERPRINTS[currentFingerprintIndex];
  console.log(`[Dutchie Client] Rotated to fingerprint: ${fp.userAgent.slice(0, 50)}...`);
  return fp;
}

export function resetFingerprint(): void {
  currentFingerprintIndex = 0;
}

/**
 * Get a random fingerprint from the pool
 */
export function getRandomFingerprint(): Fingerprint {
  const index = Math.floor(Math.random() * FINGERPRINTS.length);
  return FINGERPRINTS[index];
}

// ============================================================
// SESSION MANAGEMENT
// Per-session fingerprint rotation for stealth
// ============================================================

export interface CrawlSession {
  sessionId: string;
  fingerprint: Fingerprint;
  proxyUrl: string | null;
  stateCode?: string;
  timezone?: string;
  startedAt: Date;
}

// Note: currentSession variable declared earlier in file for proper scoping

/**
 * Timezone to Accept-Language mapping
 * US timezones all use en-US but this can be extended for international
 */
const TIMEZONE_TO_LOCALE: Record<string, string> = {
  'America/Phoenix': 'en-US,en;q=0.9',
  'America/Los_Angeles': 'en-US,en;q=0.9',
  'America/Denver': 'en-US,en;q=0.9',
  'America/Chicago': 'en-US,en;q=0.9',
  'America/New_York': 'en-US,en;q=0.9',
  'America/Detroit': 'en-US,en;q=0.9',
  'America/Anchorage': 'en-US,en;q=0.9',
  'Pacific/Honolulu': 'en-US,en;q=0.9',
};

/**
 * Get Accept-Language header for a given timezone
 */
export function getLocaleForTimezone(timezone?: string): string {
  if (!timezone) return 'en-US,en;q=0.9';
  return TIMEZONE_TO_LOCALE[timezone] || 'en-US,en;q=0.9';
}

/**
 * Start a new crawl session with a random fingerprint
 * Call this before crawling a store to get a fresh identity
 */
export function startSession(stateCode?: string, timezone?: string): CrawlSession {
  const baseFp = getRandomFingerprint();

  // Override Accept-Language based on timezone for geographic consistency
  const fingerprint: Fingerprint = {
    ...baseFp,
    acceptLanguage: getLocaleForTimezone(timezone),
  };

  currentSession = {
    sessionId: `session_${Date.now()}_${Math.random().toString(36).slice(2, 8)}`,
    fingerprint,
    proxyUrl: currentProxy,
    stateCode,
    timezone,
    startedAt: new Date(),
  };

  console.log(`[Dutchie Client] Started session ${currentSession.sessionId}`);
  console.log(`[Dutchie Client]   Fingerprint: ${fingerprint.userAgent.slice(0, 50)}...`);
  console.log(`[Dutchie Client]   Accept-Language: ${fingerprint.acceptLanguage}`);
  if (timezone) {
    console.log(`[Dutchie Client]   Timezone: ${timezone}`);
  }

  return currentSession;
}

/**
 * End the current crawl session
 */
export function endSession(): void {
  if (currentSession) {
    const duration = Math.round((Date.now() - currentSession.startedAt.getTime()) / 1000);
    console.log(`[Dutchie Client] Ended session ${currentSession.sessionId} (${duration}s)`);
    currentSession = null;
  }
}

/**
 * Get current active session
 */
export function getCurrentSession(): CrawlSession | null {
  return currentSession;
}

// ============================================================
// CURL HTTP CLIENT
// ============================================================

/**
 * Build headers for Dutchie requests
 */
export function buildHeaders(refererPath: string, fingerprint?: Fingerprint): Record<string, string> {
  const fp = fingerprint || getFingerprint();
  const refererUrl = `https://dutchie.com${refererPath}`;

  const headers: Record<string, string> = {
    'accept': 'application/json, text/plain, */*',
    'accept-language': fp.acceptLanguage,
    'content-type': 'application/json',
    'origin': 'https://dutchie.com',
    'referer': refererUrl,
    'user-agent': fp.userAgent,
    'apollographql-client-name': 'Marketplace (production)',
  };

  if (fp.secChUa) {
    headers['sec-ch-ua'] = fp.secChUa;
    headers['sec-ch-ua-mobile'] = fp.secChUaMobile || '?0';
    headers['sec-ch-ua-platform'] = fp.secChUaPlatform || '"Windows"';
    headers['sec-fetch-dest'] = 'empty';
    headers['sec-fetch-mode'] = 'cors';
    headers['sec-fetch-site'] = 'same-site';
  }

  return headers;
}

/**
 * Execute HTTP POST using curl (bypasses TLS fingerprinting)
 */
export function curlPost(url: string, body: any, headers: Record<string, string>, timeout = 30000): CurlResponse {
  const filteredHeaders = Object.entries(headers)
    .filter(([k]) => k.toLowerCase() !== 'accept-encoding')
    .map(([k, v]) => `-H '${k}: ${v}'`)
    .join(' ');

  const bodyJson = JSON.stringify(body).replace(/'/g, "'\\''");
  const timeoutSec = Math.ceil(timeout / 1000);
  const separator = '___HTTP_STATUS___';
  const proxyArg = getProxyArg();
  const cmd = `curl -s --compressed ${proxyArg} -w '${separator}%{http_code}' --max-time ${timeoutSec} ${filteredHeaders} -d '${bodyJson}' '${url}'`;

  try {
    const output = execSync(cmd, {
      encoding: 'utf-8',
      maxBuffer: 10 * 1024 * 1024,
      timeout: timeout + 5000
    });

    const separatorIndex = output.lastIndexOf(separator);
    if (separatorIndex === -1) {
      const lines = output.trim().split('\n');
      const statusCode = parseInt(lines.pop() || '0', 10);
      const responseBody = lines.join('\n');
      try {
        return { status: statusCode, data: JSON.parse(responseBody) };
      } catch {
        return { status: statusCode, data: responseBody };
      }
    }

    const responseBody = output.slice(0, separatorIndex);
    const statusCode = parseInt(output.slice(separatorIndex + separator.length).trim(), 10);

    try {
      return { status: statusCode, data: JSON.parse(responseBody) };
    } catch {
      return { status: statusCode, data: responseBody };
    }
  } catch (error: any) {
    return {
      status: 0,
      data: null,
      error: error.message || 'curl request failed'
    };
  }
}

/**
 * Execute HTTP GET using curl (bypasses TLS fingerprinting)
 * Returns HTML or JSON depending on response content-type
 */
export function curlGet(url: string, headers: Record<string, string>, timeout = 30000): CurlResponse {
  const filteredHeaders = Object.entries(headers)
    .filter(([k]) => k.toLowerCase() !== 'accept-encoding')
    .map(([k, v]) => `-H '${k}: ${v}'`)
    .join(' ');

  const timeoutSec = Math.ceil(timeout / 1000);
  const separator = '___HTTP_STATUS___';
  const proxyArg = getProxyArg();
  const cmd = `curl -s --compressed ${proxyArg} -w '${separator}%{http_code}' --max-time ${timeoutSec} ${filteredHeaders} '${url}'`;

  try {
    const output = execSync(cmd, {
      encoding: 'utf-8',
      maxBuffer: 10 * 1024 * 1024,
      timeout: timeout + 5000
    });

    const separatorIndex = output.lastIndexOf(separator);
    if (separatorIndex === -1) {
      const lines = output.trim().split('\n');
      const statusCode = parseInt(lines.pop() || '0', 10);
      const responseBody = lines.join('\n');
      return { status: statusCode, data: responseBody };
    }

    const responseBody = output.slice(0, separatorIndex);
    const statusCode = parseInt(output.slice(separatorIndex + separator.length).trim(), 10);

    // Try to parse as JSON, otherwise return as string (HTML)
    try {
      return { status: statusCode, data: JSON.parse(responseBody) };
    } catch {
      return { status: statusCode, data: responseBody };
    }
  } catch (error: any) {
    return {
      status: 0,
      data: null,
      error: error.message || 'curl request failed'
    };
  }
}

// ============================================================
// GRAPHQL EXECUTION
// ============================================================

export interface ExecuteGraphQLOptions {
  maxRetries?: number;
  retryOn403?: boolean;
  cName?: string;  // Optional - used for Referer header, defaults to 'cities'
}

/**
 * Execute GraphQL query with curl (bypasses TLS fingerprinting)
 */
export async function executeGraphQL(
  operationName: string,
  variables: any,
  hash: string,
  options: ExecuteGraphQLOptions
): Promise<any> {
  const { maxRetries = 3, retryOn403 = true, cName = 'cities' } = options;

  const body = {
    operationName,
    variables,
    extensions: {
      persistedQuery: { version: 1, sha256Hash: hash },
    },
  };

  let lastError: Error | null = null;
  let attempt = 0;

  while (attempt <= maxRetries) {
    const fingerprint = getFingerprint();
    const headers = buildHeaders(`/embedded-menu/${cName}`, fingerprint);

    console.log(`[Dutchie Client] curl POST ${operationName} (attempt ${attempt + 1}/${maxRetries + 1})`);

    const response = curlPost(DUTCHIE_CONFIG.graphqlEndpoint, body, headers, DUTCHIE_CONFIG.timeout);

    console.log(`[Dutchie Client] Response status: ${response.status}`);

    if (response.error) {
      console.error(`[Dutchie Client] curl error: ${response.error}`);
      lastError = new Error(response.error);
      attempt++;
      if (attempt <= maxRetries) {
        await sleep(1000 * attempt);
      }
      continue;
    }

    if (response.status === 200) {
      if (response.data?.errors?.length > 0) {
        console.warn(`[Dutchie Client] GraphQL errors: ${JSON.stringify(response.data.errors[0])}`);
      }
      return response.data;
    }

    if (response.status === 403 && retryOn403) {
      console.warn(`[Dutchie Client] 403 blocked - rotating proxy and fingerprint...`);
      await rotateProxyOn403('403 Forbidden on GraphQL');
      rotateFingerprint();
      attempt++;
      await sleep(1000 * attempt);
      continue;
    }

    const bodyPreview = typeof response.data === 'string'
      ? response.data.slice(0, 200)
      : JSON.stringify(response.data).slice(0, 200);
    console.error(`[Dutchie Client] HTTP ${response.status}: ${bodyPreview}`);
    lastError = new Error(`HTTP ${response.status}`);

    attempt++;
    if (attempt <= maxRetries) {
      await sleep(1000 * attempt);
    }
  }

  throw lastError || new Error('Max retries exceeded');
}

// ============================================================
// HTML PAGE FETCHING
// ============================================================

export interface FetchPageOptions {
  maxRetries?: number;
  retryOn403?: boolean;
}

/**
 * Fetch HTML page from Dutchie (for city pages, dispensary pages, etc.)
 * Returns raw HTML string
 */
export async function fetchPage(
  path: string,
  options: FetchPageOptions = {}
): Promise<{ html: string; status: number } | null> {
  const { maxRetries = 3, retryOn403 = true } = options;
  const url = `${DUTCHIE_CONFIG.baseUrl}${path}`;

  let attempt = 0;

  while (attempt <= maxRetries) {
    const fingerprint = getFingerprint();
    const headers: Record<string, string> = {
      'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8',
      'accept-language': fingerprint.acceptLanguage,
      'user-agent': fingerprint.userAgent,
    };

    if (fingerprint.secChUa) {
      headers['sec-ch-ua'] = fingerprint.secChUa;
      headers['sec-ch-ua-mobile'] = fingerprint.secChUaMobile || '?0';
      headers['sec-ch-ua-platform'] = fingerprint.secChUaPlatform || '"Windows"';
      headers['sec-fetch-dest'] = 'document';
      headers['sec-fetch-mode'] = 'navigate';
      headers['sec-fetch-site'] = 'none';
      headers['sec-fetch-user'] = '?1';
      headers['upgrade-insecure-requests'] = '1';
    }

    console.log(`[Dutchie Client] curl GET ${path} (attempt ${attempt + 1}/${maxRetries + 1})`);

    const response = curlGet(url, headers, DUTCHIE_CONFIG.timeout);

    console.log(`[Dutchie Client] Response status: ${response.status}`);

    if (response.error) {
      console.error(`[Dutchie Client] curl error: ${response.error}`);
      attempt++;
      if (attempt <= maxRetries) {
        await sleep(1000 * attempt);
      }
      continue;
    }

    if (response.status === 200) {
      return { html: response.data, status: response.status };
    }

    if (response.status === 403 && retryOn403) {
      console.warn(`[Dutchie Client] 403 blocked - rotating proxy and fingerprint...`);
      await rotateProxyOn403('403 Forbidden on page fetch');
      rotateFingerprint();
      attempt++;
      await sleep(1000 * attempt);
      continue;
    }

    console.error(`[Dutchie Client] HTTP ${response.status}`);
    attempt++;
    if (attempt <= maxRetries) {
      await sleep(1000 * attempt);
    }
  }

  return null;
}

/**
 * Extract __NEXT_DATA__ from HTML page
 */
export function extractNextData(html: string): any | null {
  const match = html.match(/<script id="__NEXT_DATA__" type="application\/json">([^<]+)<\/script>/);
  if (match && match[1]) {
    try {
      return JSON.parse(match[1]);
    } catch (e) {
      console.error('[Dutchie Client] Failed to parse __NEXT_DATA__:', e);
      return null;
    }
  }
  return null;
}

// ============================================================
// UTILITY
// ============================================================

function sleep(ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms));
}