// Main web application bootstrap, route wiring, and lifecycle setup.

const express = require('express');
const http = require('http');
const multer = require('multer');
const fs = require('fs');
const crypto = require('crypto');
const common = require('./common');
const { verifyPassword, createSessionToken, hashSessionToken, hashPassword, validatePasswordStrength } = require('#src/auth');
const pages = require('#src/web/pages');
const registerMiddleware = require('#src/web/middleware');
const { createBackgroundTaskQueue } = require('#src/web/lib/background-tasks/queue');
const { initializeBackgroundTasks } = require('#src/web/lib/background-tasks');
const { createDataSourceTaskService } = require('#src/web/lib/background-tasks/tasks-scheduled/data-source-refresh');
const { captureSlideThumbnail } = require('#src/web/lib/media');
const { createWebBootstrap } = require('#src/web/bootstrap');
const { registerRoutes } = require('#src/web/routes/register');
const { createNotifyPlayerScreens } = require('#src/web/lib/notify-player-screens');
const { initializeWebServer } = require('#src/web/lib/web-startup');
const { createWebConfig } = require('#src/web/lib/config');
const { requirePermission: createRequirePermission, PERMISSION_DENIED_MESSAGE } = require('#src/rbac');
const { rbacData } = require('#src/web/lib/auth');
const { createPlayerActionService } = require('#src/web/lib/player-actions');
const { isClientNameAvailable, withClientNameReservation } = require('#src/data/client-name-check');
const { createSessionService } = require('#src/web/lib/auth');
const { hasAnyPermission } = require('#src/rbac');
const { ensureFontLibrary } = require('#src/web/lib/media/font-library');
const {
  formatDashboardDate,
  readArrayField,
  parseDateTimeLocal,
  parseTimeLocal,
  normalizeScheduleMode,
  getAuditUserId,
  getCanvasSignature,
  fetchPlaylistCanvasId,
  fetchPlaylistCanvasSignature,
  fetchScreensByPlaylistId,
  fetchScreensBySlideId,
  fetchScreensByTemplateId,
  fetchOrderedPlaylistSlides,
  redirectAfterSave
} = require('#src/web/lib/helpers');

async function start() {
  // Core app and filesystem setup.
  const app = express();
  const server = http.createServer(app);
  const pool = common.createPool();
  const webConfig = createWebConfig();

  // Background services and request forwarding helpers.
  const backgroundTaskQueue = createBackgroundTaskQueue({
    pool: pool,
    maxConcurrent: 1
  });
  const dataSourceTasks = createDataSourceTaskService({
    pool: pool,
    common: common,
    backgroundTaskQueue: backgroundTaskQueue
  });
  const playerActionService = createPlayerActionService({
    pool: pool,
    common: common,
    playerInternalBaseUrl: webConfig.thinClientBaseUrl
  });
  const notifyPlayerScreens = createNotifyPlayerScreens(playerActionService.forwardPlayerCommand);

  // Centralized dashboard/player bootstrap.
  const webBootstrap = createWebBootstrap({
    pool: pool,
    common: common,
    playerInternalBaseUrl: webConfig.playerInternalBaseUrl,
    thinClientBaseUrl: webConfig.thinClientBaseUrl,
    uploadDir: webConfig.uploadsDir,
    formatDashboardDate: formatDashboardDate,
    notifyPlayerScreens: notifyPlayerScreens,
    backgroundTaskQueue: backgroundTaskQueue,
    hasAnyPermission: hasAnyPermission,
  });
  const upload = webBootstrap.upload;
  const collectUploadReferencesFromSlide = webBootstrap.collectUploadReferencesFromSlide;
  const collectUploadReferencesFromTemplate = webBootstrap.collectUploadReferencesFromTemplate;
  const collectUploadReferencesFromPayload = webBootstrap.collectUploadReferencesFromPayload;
  const removeUnusedUploadFiles = webBootstrap.removeUnusedUploadFiles;
  const syncPlaylistUploadsOnChange = webBootstrap.syncPlaylistUploadsOnChange;

  // Background task initialization.
  // Session and auth helpers for route registration.
  const broadcastDashboardState = webBootstrap.broadcastDashboardState;
  const sessionService = createSessionService({
    sessionCookieName: webConfig.sessionCookieName,
    sessionMaxAgeMs: webConfig.sessionMaxAgeMs,
    hashSessionToken: hashSessionToken,
    createSessionToken: createSessionToken
  });
  const parseCookies = sessionService.parseCookies;
  const createUserSession = sessionService.createUserSession;
  const clearSessionCookie = sessionService.clearSessionCookie;
  const setSessionCookie = sessionService.setSessionCookie;
  const setAuthMessageCookie = sessionService.setAuthMessageCookie;
  const consumeAuthMessageCookie = sessionService.consumeAuthMessageCookie;
  const loadCurrentUser = sessionService.loadCurrentUser;
  const requireAuth = sessionService.requireAuth;
  // Middleware and route registration.
  registerMiddleware(app, {
    pool: pool,
    loadCurrentUser: loadCurrentUser,
    requireAuth: requireAuth,
    MEDIA_DIR: webConfig.mediaDir,
    UPLOADS_DIR: webConfig.uploadsDir,
    THUMBNAILS_DIR: webConfig.thumbnailsDir,
    ASSET_DIR: webConfig.assetDir
  });

  registerRoutes(app, {
    pool: pool,
    common: common,
    pages: pages,
    upload: upload,
    uploadDir: webConfig.uploadsDir,
    createUserSession: createUserSession,
    setSessionCookie: setSessionCookie,
    clearSessionCookie: clearSessionCookie,
    setAuthMessageCookie: setAuthMessageCookie,
    consumeAuthMessageCookie: consumeAuthMessageCookie,
    parseCookies: parseCookies,
    hashSessionToken: hashSessionToken,
    verifyPassword: verifyPassword,
    sessionCookieName: webConfig.sessionCookieName,
    formatDashboardDate: formatDashboardDate,
    getAuditUserId: getAuditUserId,
    hashPassword: hashPassword,
    validatePasswordStrength: validatePasswordStrength,
    readArrayField: readArrayField,
    rbacData: rbacData,
    fetchOrderedPlaylistSlides: fetchOrderedPlaylistSlides,
    fetchScreensByPlaylistId: fetchScreensByPlaylistId,
    fetchScreensBySlideId: fetchScreensBySlideId,
    fetchScreensByTemplateId: fetchScreensByTemplateId,
    fetchPlaylistCanvasId: fetchPlaylistCanvasId,
    fetchPlaylistCanvasSignature: fetchPlaylistCanvasSignature,
    getCanvasSignature: getCanvasSignature,
    normalizeScheduleMode: normalizeScheduleMode,
    parseDateTimeLocal: parseDateTimeLocal,
    parseTimeLocal: parseTimeLocal,
    redirectAfterSave: redirectAfterSave,
    notifyPlayerScreens: notifyPlayerScreens,
    broadcastDashboardState: broadcastDashboardState,
    dataSourceTasks: dataSourceTasks,
    playerActionService: playerActionService,
    isClientNameAvailable: isClientNameAvailable,
    withClientNameReservation: withClientNameReservation,
    requirePermission: function (permissionKey, options) {
      return createRequirePermission(permissionKey, Object.assign({ setAuthMessageCookie: setAuthMessageCookie }, options));
    },
    hasAnyPermission: hasAnyPermission,
    backgroundTaskQueue: backgroundTaskQueue,
    mediaDir: webConfig.mediaDir,
    uploadSyncService: webBootstrap.uploadSyncService,
    collectUploadReferencesFromSlide: collectUploadReferencesFromSlide,
    collectUploadReferencesFromTemplate: collectUploadReferencesFromTemplate,
    collectUploadReferencesFromPayload: collectUploadReferencesFromPayload,
    removeUnusedUploadFiles: removeUnusedUploadFiles,
    syncPlaylistUploadsOnChange: syncPlaylistUploadsOnChange,
    buildDashboardState: webBootstrap.buildDashboardState
  });

  app.use(function (error, req, res, _next) {
    console.error(error);
    const statusCode = Number(error && (error.statusCode || error.status)) || 500;
    const isXhr = String(req.get && req.get('X-Requested-With') || '').toLowerCase() === 'xmlhttprequest';
    const wantsHtml = !isXhr && !String(req.originalUrl || '').startsWith('/api/') && (!req.accepts || req.accepts('html'));

    if (wantsHtml && pages.renderErrorPage) {
      const isPermissionError = statusCode === 403;
      const message = isPermissionError
        ? String(error && error.message ? error.message : PERMISSION_DENIED_MESSAGE)
        : String(error && error.message ? error.message : 'An unexpected error occurred.');
      const title = isPermissionError
        ? 'Access denied'
        : statusCode === 404
          ? 'Not found'
          : 'Something went wrong';

      return res.status(statusCode).send(pages.renderErrorPage({
        statusCode: statusCode,
        title: title,
        errorTitle: title,
        message: message,
        detail: statusCode >= 500 ? 'The server could not complete the request.' : '',
        backUrl: req.currentUser ? '/dashboard' : '/login',
        backLabel: req.currentUser ? 'Back to dashboard' : 'Sign in'
      }, req.currentUser));
    }

    res.status(statusCode).send(statusCode >= 500 ? 'Internal server error' : String(error && error.message ? error.message : 'Error'));
  });

  // Bootstrap and startup tasks.
  fs.mkdirSync(webConfig.mediaDir, { recursive: true });
  await ensureFontLibrary(webConfig.mediaDir);
  await initializeWebServer({
    common: common,
    pool: pool,
    mediaDir: webConfig.mediaDir,
    backgroundTaskQueue: backgroundTaskQueue,
    webBootstrap: webBootstrap,
    loadCurrentUser: loadCurrentUser,
    initializeBackgroundTasks: initializeBackgroundTasks,
    captureSlideThumbnail: captureSlideThumbnail,
    server: server,
    webBaseUrl: webConfig.webBaseUrl,
    dataSourceStartupRefreshStaggerMs: webConfig.dataSourceStartupRefreshStaggerMs
  });

  server.listen(webConfig.port, function () {
    console.log(`Pulse Signage app listening on port ${webConfig.port}`);
  });

}

module.exports = { start };

if (require.main === module) {
  start().catch(function (error) {
    console.error(error);
    process.exit(1);
  });
}