import { EventEmitter } from 'events';
import { logger } from '../util/logger.js';
import { LinkManager } from './LinkManager.js';
import { GameController } from '../game/GameController.js';
import { ScreenReader } from '../game/ScreenReader.js';
import { ClientLogWatcher } from '../log/ClientLogWatcher.js';
import { TradeMonitor } from '../trade/TradeMonitor.js';
import { InventoryManager } from '../inventory/InventoryManager.js';
import { TradeExecutor } from '../executor/TradeExecutor.js';
import { TradeQueue } from '../executor/TradeQueue.js';
import { ScrapExecutor } from '../executor/ScrapExecutor.js';
import type { TradeLink } from './LinkManager.js';
import type { ConfigStore } from './ConfigStore.js';
import type { Config, LinkMode, PostAction } from '../types.js';
import type { Page } from 'playwright';

export interface BotStatus {
  paused: boolean;
  state: string;
  links: TradeLink[];
  tradesCompleted: number;
  tradesFailed: number;
  uptime: number;
  settings: {
    poe2LogPath: string;
    poe2WindowTitle: string;
    travelTimeoutMs: number;
    waitForMoreItemsMs: number;
    betweenTradesDelayMs: number;
  };
  inventory?: {
    grid: boolean[][];
    items: { row: number; col: number; w: number; h: number }[];
    free: number;
  };
}

export class Bot extends EventEmitter {
  private paused: boolean;
  private _state = 'IDLE';
  private tradesCompleted = 0;
  private tradesFailed = 0;
  private startTime = Date.now();
  private _inventory: BotStatus['inventory'] = undefined;
  private _started = false;

  readonly links: LinkManager;
  readonly store: ConfigStore;
  readonly config: Config;

  gameController!: GameController;
  screenReader!: ScreenReader;
  logWatcher!: ClientLogWatcher;
  tradeMonitor!: TradeMonitor;
  inventoryManager!: InventoryManager;
  tradeExecutor!: TradeExecutor;
  tradeQueue!: TradeQueue;
  scrapExecutors = new Map<string, ScrapExecutor>();

  constructor(store: ConfigStore, config: Config) {
    super();
    this.store = store;
    this.config = config;
    this.paused = store.settings.paused;
    this.links = new LinkManager(store);
  }

  get isReady(): boolean {
    return this._started;
  }

  get isPaused(): boolean {
    return this.paused;
  }

  get state(): string {
    return this._state;
  }

  set state(s: string) {
    if (this._state !== s) {
      this._state = s;
      this.emit('status-update');
    }
  }

  pause(): void {
    this.paused = true;
    this.store.setPaused(true);
    logger.info('Bot paused');
    this.emit('status-update');
  }

  resume(): void {
    this.paused = false;
    this.store.setPaused(false);
    logger.info('Bot resumed');
    this.emit('status-update');
  }

  // --- Link operations (delegate to LinkManager + emit events) ---

  addLink(url: string, name?: string, mode?: LinkMode, postAction?: PostAction): TradeLink {
    const link = this.links.addLink(url, name, mode, postAction);
    this.emit('link-added', link);
    this.emit('status-update');
    return link;
  }

  removeLink(id: string): void {
    this.links.removeLink(id);
    this.emit('link-removed', id);
    this.emit('status-update');
  }

  toggleLink(id: string, active: boolean): void {
    const link = this.links.toggleLink(id, active);
    if (link) {
      this.emit('link-toggled', { id, active, link });
      this.emit('status-update');
    }
  }

  updateLinkName(id: string, name: string): void {
    this.links.updateName(id, name);
    this.emit('status-update');
  }

  updateLinkMode(id: string, mode: LinkMode): void {
    const link = this.links.updateMode(id, mode);
    if (link) {
      this.emit('link-mode-changed', { id, mode, link });
      this.emit('status-update');
    }
  }

  updateLinkPostAction(id: string, postAction: PostAction): void {
    const link = this.links.updatePostAction(id, postAction);
    if (link) {
      this.emit('link-postaction-changed', { id, postAction, link });
      this.emit('status-update');
    }
  }

  isLinkActive(searchId: string): boolean {
    return this.links.isActive(searchId);
  }

  updateSettings(updates: Record<string, unknown>): void {
    this.store.updateSettings(updates);
    this.emit('status-update');
  }

  setInventory(inv: BotStatus['inventory']): void {
    this._inventory = inv;
  }

  getStatus(): BotStatus {
    const s = this.store.settings;
    return {
      paused: this.paused,
      state: this._state,
      links: this.links.getLinks(),
      tradesCompleted: this.tradesCompleted,
      tradesFailed: this.tradesFailed,
      uptime: Date.now() - this.startTime,
      settings: {
        poe2LogPath: s.poe2LogPath,
        poe2WindowTitle: s.poe2WindowTitle,
        travelTimeoutMs: s.travelTimeoutMs,
        waitForMoreItemsMs: s.waitForMoreItemsMs,
        betweenTradesDelayMs: s.betweenTradesDelayMs,
      },
      inventory: this._inventory,
    };
  }

  /** Called by executor state callbacks to update bot state */
  updateExecutorState(): void {
    this._inventory = this.inventoryManager.getInventoryState();

    const execState = this.tradeExecutor.getState();
    if (execState !== 'IDLE') {
      this.state = execState;
      return;
    }

    for (const [, scrapExec] of this.scrapExecutors) {
      const scrapState = scrapExec.getState();
      if (scrapState !== 'IDLE') {
        this.state = scrapState;
        return;
      }
    }

    this.state = 'IDLE';
  }

  // --- Startup / Shutdown ---

  async start(cliUrls: string[], port: number): Promise<void> {
    this.screenReader = new ScreenReader();
    this.gameController = new GameController(this.config);

    this.logWatcher = new ClientLogWatcher(this.config.poe2LogPath);
    await this.logWatcher.start();
    this.emit('log', 'info', 'Watching Client.txt for game events');

    this.tradeMonitor = new TradeMonitor(this.config);
    await this.tradeMonitor.start(`http://localhost:${port}`);
    this.emit('log', 'info', 'Browser launched');

    this.inventoryManager = new InventoryManager(
      this.gameController, this.screenReader, this.logWatcher, this.config,
    );

    // Pre-warm OCR daemon + EasyOCR model in background (don't await yet)
    const ocrWarmup = this.screenReader.warmup().catch(err => {
      logger.warn({ err }, 'OCR warmup failed (will retry on first use)');
    });

    // Check if already in hideout from log tail
    const alreadyInHideout = this.logWatcher.currentArea.toLowerCase().includes('hideout');

    if (alreadyInHideout) {
      logger.info({ area: this.logWatcher.currentArea }, 'Already in hideout, skipping /hideout command');
      this.inventoryManager.setLocation(true);
    } else {
      this.emit('log', 'info', 'Sending /hideout command...');
      await this.gameController.focusGame();
      const arrivedHome = await this.inventoryManager.waitForAreaTransition(
        this.config.travelTimeoutMs,
        () => this.gameController.goToHideout(),
      );
      if (arrivedHome) {
        this.inventoryManager.setLocation(true);
        this.logWatcher.currentArea = 'Hideout';
      } else {
        this.inventoryManager.setLocation(true);
        this.logWatcher.currentArea = 'Hideout';
        logger.warn('Timed out waiting for hideout transition on startup (may already be in hideout)');
      }
    }
    this.state = 'IN_HIDEOUT';
    this.emit('log', 'info', 'In hideout, ready to trade');

    // Ensure OCR warmup finished before proceeding to inventory scan
    await ocrWarmup;

    // Clear leftover inventory
    this.emit('log', 'info', 'Checking inventory for leftover items...');
    await this.inventoryManager.clearToStash();
    this.emit('log', 'info', 'Inventory cleared');

    // Create executors
    this.tradeExecutor = new TradeExecutor(
      this.gameController, this.screenReader, this.tradeMonitor,
      this.inventoryManager, this.config,
    );
    this.tradeExecutor.onStateChange = () => this.updateExecutorState();

    this.tradeQueue = new TradeQueue(this.tradeExecutor, this.config);

    // Collect all URLs: CLI args + saved links (deduped)
    const allUrls = new Set<string>([
      ...cliUrls,
      ...this.store.settings.links.map(l => l.url),
    ]);

    // Load links (direct, before wiring events)
    for (const url of allUrls) {
      const link = this.links.addLink(url);
      if (link.active) {
        await this.activateLink(link);
      } else {
        this.emit('log', 'info', `Loaded (inactive): ${link.name || link.label}`);
      }
    }

    // Wire events for subsequent UI-triggered changes
    this.wireEvents();

    this._started = true;
    this.emit('log', 'info', `Loaded ${allUrls.size} trade link(s) from config`);
    logger.info('Bot started');
  }

  async stop(): Promise<void> {
    logger.info('Shutting down bot...');
    for (const [, scrapExec] of this.scrapExecutors) {
      await scrapExec.stop();
    }
    await this.screenReader.dispose();
    await this.tradeMonitor.stop();
    await this.logWatcher.stop();
  }

  // --- Internal ---

  private wireEvents(): void {
    this.on('link-added', (link: TradeLink) => {
      if (link.active) {
        this.activateLink(link).catch(err => {
          logger.error({ err }, 'Failed to activate link from event');
        });
      }
    });

    this.on('link-removed', (id: string) => {
      this.deactivateLink(id).catch(err => {
        logger.error({ err }, 'Failed to deactivate link from event');
      });
      this.emit('log', 'info', `Removed search: ${id}`);
    });

    this.on('link-toggled', (data: { id: string; active: boolean; link: TradeLink }) => {
      if (data.active) {
        this.activateLink(data.link).catch(err => {
          logger.error({ err }, 'Failed to activate link from toggle');
        });
        this.emit('log', 'info', `Activated: ${data.link.name || data.id}`);
      } else {
        this.deactivateLink(data.id).catch(err => {
          logger.error({ err }, 'Failed to deactivate link from toggle');
        });
        this.emit('log', 'info', `Deactivated: ${data.link.name || data.id}`);
      }
    });

    this.on('link-mode-changed', (data: { id: string; mode: string; link: TradeLink }) => {
      if (data.link.active) {
        this.deactivateLink(data.id).then(() => this.activateLink(data.link)).catch(err => {
          logger.error({ err }, 'Failed to restart link after mode change');
        });
        this.emit('log', 'info', `Mode changed to ${data.mode}: ${data.link.name || data.id}`);
      }
    });

    this.on('link-postaction-changed', (data: { id: string; postAction: string; link: TradeLink }) => {
      if (data.link.active) {
        this.deactivateLink(data.id).then(() => this.activateLink(data.link)).catch(err => {
          logger.error({ err }, 'Failed to restart link after postAction change');
        });
        this.emit('log', 'info', `Post-action changed to ${data.postAction}: ${data.link.name || data.id}`);
      }
    });

    // Trade monitor → trade queue
    this.tradeMonitor.on('new-listings', (data: { searchId: string; itemIds: string[]; page: Page }) => {
      if (this.isPaused) {
        this.emit('log', 'warn', `New listings (${data.itemIds.length}) skipped - bot paused`);
        return;
      }
      if (!this.isLinkActive(data.searchId)) return;

      logger.info({ searchId: data.searchId, itemCount: data.itemIds.length }, 'New listings received, queuing trade...');
      this.emit('log', 'info', `New listings: ${data.itemIds.length} items from ${data.searchId}`);

      this.tradeQueue.enqueue({
        searchId: data.searchId,
        itemIds: data.itemIds,
        whisperText: '',
        timestamp: Date.now(),
        tradeUrl: '',
        page: data.page,
      });
    });
  }

  private async activateLink(link: TradeLink): Promise<void> {
    try {
      if (link.mode === 'scrap') {
        const scrapExec = new ScrapExecutor(
          this.gameController, this.screenReader, this.tradeMonitor,
          this.inventoryManager, this.config,
        );
        scrapExec.onStateChange = () => this.updateExecutorState();
        this.scrapExecutors.set(link.id, scrapExec);
        this.emit('log', 'info', `Scrap loop started: ${link.name || link.label}`);
        this.emit('status-update');

        scrapExec.runScrapLoop(link.url, link.postAction).catch((err) => {
          logger.error({ err, linkId: link.id }, 'Scrap loop error');
          this.emit('log', 'error', `Scrap loop failed: ${link.name || link.label}`);
          this.scrapExecutors.delete(link.id);
        });
      } else {
        await this.tradeMonitor.addSearch(link.url);
        this.emit('log', 'info', `Monitoring: ${link.name || link.label}`);
        this.emit('status-update');
      }
    } catch (err) {
      logger.error({ err, url: link.url }, 'Failed to activate link');
      this.emit('log', 'error', `Failed to activate: ${link.name || link.label}`);
    }
  }

  private async deactivateLink(id: string): Promise<void> {
    const scrapExec = this.scrapExecutors.get(id);
    if (scrapExec) {
      await scrapExec.stop();
      this.scrapExecutors.delete(id);
    }
    await this.tradeMonitor.pauseSearch(id);
  }
}