import express from 'express';
import path from 'path';
import type { Server } from 'http';
import type { AddressInfo } from 'node:net';
import type { Logger } from '../utils/logger.js';
import type { Config } from '../config/index.js';
import type {
  PostsRepository,
  MessagesRepository,
  SuccessfulMessagesRepository,
  ConversationStateRepository,
  ActivityLogRepository,
} from '../database/repositories.js';
import type { ChatService } from '../services/chat.js';
import type { MediaService } from '../services/media.js';
import type { MediaSyncService } from '../services/media-sync.js';
import type { ResponseCheckerService } from '../services/response-checker.js';
import type { RateLimiter } from '../utils/rate-limiter.js';
import type { OpenRouterClient } from '../ai/openrouter.js';
import type { StrategySelector } from '../services/strategy-selector.js';
import type { BrowserClient } from '../browser/client.js';
import type { RedditSessionImporter } from '../services/reddit-session-importer.js';
import type { AccountAuthContext } from '../services/account-auth-context.js';
import type { ConfigStore } from '../config/persistence.js';
import type { RedditAccountsService } from '../services/reddit-accounts.js';
import type { RedditAccountRuntimeManager } from '../services/reddit-account-runtime.js';
import { ActivityLog } from './activity-log.js';
import { LogBroadcaster } from './log-broadcaster.js';
import type { WebContext } from './context.js';
import type { ActivityItem, LogEntry, RuntimeConfig } from './types.js';
import { createStatsRouter } from './routes/stats.js';
import { createChatsRouter } from './routes/chats.js';
import { createConversationsRouter } from './routes/conversations.js';
import { createMediaRouter } from './routes/media.js';
import { createControlRouter } from './routes/control.js';
import { createDebugRouter } from './routes/debug.js';
import { createLogsRouter } from './routes/logs.js';
import { createAnalyticsRouter } from './routes/analytics.js';
import { createConfigRouter } from './routes/config.js';
import { createLoginRouter } from './routes/login.js';
import { createDashboardAuth, createDashboardSessionRouter } from './auth.js';
import { resolveDashboardAssets } from './dashboard-assets.js';
import { createAgentRouter, createHealthRouter } from './routes/agent.js';
import { createAttentionRouter } from './routes/attention.js';
import type { AiUsageRepository } from '../database/ai-usage-repository.js';

export type { BotStats, ActivityItem, LogEntry, RuntimeConfig } from './types.js';

/**
 * Thin Express shell. Owns the server lifecycle, the activity log,
 * the SSE log broadcaster, and a `WebContext` that route modules read from.
 *
 * Service references (chat, media, etc.) are still injected via `set*`
 * methods because `index.ts` builds them after the WebServer to keep
 * setup ordering identical to the pre-refactor code.
 */
export class WebServer {
  private app: express.Application;
  private server: Server | null = null;
  private activity: ActivityLog;
  private broadcaster: LogBroadcaster;
  private botRunning = false;
  private messagesThisHour = 0;
  private runtimeConfig: RuntimeConfig;
  private onConfigChange: ((config: RuntimeConfig) => void) | null = null;

  private services: WebContext['services'] = {};

  constructor(
    private port: number,
    private config: Config,
    private postsRepo: PostsRepository,
    private messagesRepo: MessagesRepository,
    private successfulMessagesRepo: SuccessfulMessagesRepository,
    private activityLogRepo: ActivityLogRepository,
    private logger: Logger,
    broadcaster?: LogBroadcaster,
    private workspaceDirectory = process.cwd(),
    private aiUsageRepo?: AiUsageRepository,
  ) {
    this.broadcaster = broadcaster ?? new LogBroadcaster();
    this.activity = new ActivityLog(activityLogRepo);
    this.runtimeConfig = {
      rateLimit: {
        minDelayBetweenMessagesMs: config.rateLimit.minDelayBetweenMessagesMs,
        maxMessagesPerHour: config.rateLimit.maxMessagesPerHour,
        jitterMs: config.rateLimit.jitterMs,
      },
      browser: { dryRun: config.browser.dryRun },
      reddit: {
        prioritizeRecentPosts: config.reddit.prioritizeRecentPosts,
        recentWindowMinutes: config.reddit.recentWindowMinutes,
      },
    };
    this.app = express();
    this.setupRoutes();
  }

  private context(): WebContext {
    return {
      logger: this.logger,
      config: this.config,
      runtimeConfig: this.runtimeConfig,
      activity: this.activity,
      broadcaster: this.broadcaster,
      repos: {
        posts: this.postsRepo,
        messages: this.messagesRepo,
        successful: this.successfulMessagesRepo,
        aiUsage: this.aiUsageRepo,
      },
      services: this.services,
      getBotRunning: () => this.botRunning,
      setBotRunning: (running) => {
        this.botRunning = running;
      },
      getMessagesThisHour: () => this.messagesThisHour,
      getOnConfigChange: () => this.onConfigChange,
    };
  }

  private setupRoutes(): void {
    const dashboardToken = this.config.web.authToken;
    if (!dashboardToken) {
      throw new Error('Web dashboard requires web.authToken or WEB_DASHBOARD_TOKEN');
    }
    this.app.use(express.json({ limit: '64kb' }));
    this.app.use(createHealthRouter());
    this.app.use(createDashboardSessionRouter(dashboardToken));
    this.app.use(createDashboardAuth(dashboardToken, {
      readToken: this.config.web.agentReadToken,
      controlToken: this.config.web.agentControlToken,
    }));

    const dashboardAssets = resolveDashboardAssets(this.workspaceDirectory);

    // index.html serves the entire inline JS — never cache it.
    this.app.use((req, res, next) => {
      if (req.path === '/' || req.path === '/index.html') {
        res.set('Cache-Control', 'no-cache, no-store, must-revalidate');
        return res.sendFile(dashboardAssets.indexFile);
      }
      next();
    });

    // Media can contain private chat attachments, so it is intentionally behind
    // the same dashboard authentication middleware as the API and UI.
    this.app.use('/media', express.static(path.join(this.workspaceDirectory, 'data', 'media'), { index: false }));
    this.app.use(express.static(dashboardAssets.directory, { index: false }));

    const ctx = this.context();
    this.app.use('/api', createAgentRouter(ctx));
    this.app.use('/api', createStatsRouter(ctx));
    this.app.use('/api', createAttentionRouter(ctx));
    this.app.use('/api', createChatsRouter(ctx));
    this.app.use('/api', createConversationsRouter(ctx));
    this.app.use('/api', createMediaRouter(ctx));
    this.app.use('/api', createControlRouter(ctx));
    if (this.config.web.debugEnabled) {
      this.app.use('/api', createDebugRouter(ctx));
    }
    this.app.use('/api', createLogsRouter(ctx));
    this.app.use('/api', createAnalyticsRouter(ctx));
    this.app.use('/api', createConfigRouter(ctx));
    this.app.use('/api', createLoginRouter(ctx));

    this.app.use('/api', (_req, res) => {
      res.status(404).json({ error: 'API endpoint not found' });
    });

    // SPA catch-all.
    this.app.get(/.*/, (_req, res) => {
      res.sendFile(dashboardAssets.indexFile);
    });
  }

  // ---------- public API used by the bootstrapper ----------

  isRunning(): boolean {
    return this.botRunning;
  }

  get dashboardEvents(): LogBroadcaster['dashboardEvents'] {
    return this.broadcaster.dashboardEvents;
  }

  setChatService(chatService: ChatService): void {
    this.services.chat = chatService;
  }

  setMediaService(mediaService: MediaService): void {
    this.services.media = mediaService;
  }

  setMediaSyncService(mediaSyncService: MediaSyncService): void {
    this.services.mediaSync = mediaSyncService;
  }

  setResponseChecker(responseChecker: ResponseCheckerService): void {
    this.services.responseChecker = responseChecker;
  }

  setRateLimiter(rateLimiter: RateLimiter): void {
    this.services.rateLimiter = rateLimiter;
  }

  setAiClient(aiClient: OpenRouterClient): void {
    this.services.ai = aiClient;
  }

  setStrategySelector(strategySelector: StrategySelector): void {
    this.services.strategySelector = strategySelector;
  }

  setBrowserClient(browserClient: BrowserClient): void {
    this.services.browser = browserClient;
  }

  setSessionImporter(sessionImporter: RedditSessionImporter): void {
    this.services.sessionImporter = sessionImporter;
  }

  setAccountAuth(accountAuth: AccountAuthContext): void {
    this.services.accountAuth = accountAuth;
  }

  setConversationStateRepository(conversationState: ConversationStateRepository): void {
    this.services.conversationState = conversationState;
  }

  setConfigStore(configStore: ConfigStore): void {
    this.services.configStore = configStore;
  }

  setRedditAccountsService(accounts: RedditAccountsService): void {
    this.services.redditAccounts = accounts;
  }

  setAccountRuntimeManager(runtimes: RedditAccountRuntimeManager): void {
    this.services.accountRuntimes = runtimes;
  }

  logActivity(
    type: ActivityItem['type'],
    message: string,
    recipient?: string,
    imageUrl?: string,
    origin?: { postTitle: string; postUrl: string },
  ): void {
    this.activity.push(type, message, recipient, imageUrl, origin);
  }

  pushLog(level: LogEntry['level'], message: string, data?: unknown): void {
    this.broadcaster.push(level, message, data);
  }

  /** Fan a sync-progress frame out over the existing log SSE stream. */
  broadcastSyncProgress(progress: Record<string, unknown> | null): void {
    this.broadcaster.broadcastEvent('sync-progress', { progress });
  }

  getRuntimeConfig(): RuntimeConfig {
    return this.runtimeConfig;
  }

  setOnConfigChange(callback: (config: RuntimeConfig) => void): void {
    this.onConfigChange = callback;
  }

  updateStats(messagesThisHour: number): void {
    this.messagesThisHour = messagesThisHour;
  }

  start(): Promise<number> {
    return new Promise((resolve, reject) => {
      const server = this.app.listen(this.port);
      this.server = server;
      server.once('error', reject);
      server.once('listening', () => {
        const address = server.address() as AddressInfo | null;
        const listeningPort = address?.port ?? this.port;
        this.logger.info(`Web dashboard running at http://localhost:${listeningPort}`);
        this.broadcaster.push('info', `Web dashboard started on port ${listeningPort}`);
        resolve(listeningPort);
      });
    });
  }

  stop(): void {
    this.broadcaster.closeAll();
    if (this.server) {
      this.server.close();
      this.server = null;
    }
  }

  /** Exposed for health probes and integration tests when configured with port 0. */
  getListeningPort(): number | null {
    const address = this.server?.address();
    return address && typeof address !== 'string' ? (address as AddressInfo).port : null;
  }
}