import { join } from 'path';
import { InventoryTracker } from './InventoryTracker.js';
import type { PlacedItem } from './InventoryTracker.js';
import { GRID_LAYOUTS } from '../game/GridReader.js';
import { sleep } from '../util/sleep.js';
import { logger } from '../util/logger.js';
import type { Config, PostAction } from '../types.js';
import type { GameController } from '../game/GameController.js';
import type { ScreenReader } from '../game/ScreenReader.js';
import type { ClientLogWatcher } from '../log/ClientLogWatcher.js';

const SALVAGE_TEMPLATE = join('assets', 'salvage.png');

export class InventoryManager {
  readonly tracker = new InventoryTracker();
  private atOwnHideout = true;
  private currentSellerAccount = '';
  private gameController: GameController;
  private screenReader: ScreenReader;
  private logWatcher: ClientLogWatcher;
  private config: Config;

  constructor(
    gameController: GameController,
    screenReader: ScreenReader,
    logWatcher: ClientLogWatcher,
    config: Config,
  ) {
    this.gameController = gameController;
    this.screenReader = screenReader;
    this.logWatcher = logWatcher;
    this.config = config;
  }

  /** Set location state (called by executors when they travel). */
  setLocation(atHome: boolean, seller?: string): void {
    this.atOwnHideout = atHome;
    this.currentSellerAccount = seller || '';
  }

  get isAtOwnHideout(): boolean {
    return this.atOwnHideout;
  }

  get sellerAccount(): string {
    return this.currentSellerAccount;
  }

  /** Scan the real inventory via grid reader and initialize the tracker. */
  async scanInventory(defaultAction: PostAction = 'stash'): Promise<void> {
    logger.info('Scanning inventory...');
    await this.gameController.focusGame();
    await sleep(300);
    await this.gameController.openInventory();

    const result = await this.screenReader.grid.scan('inventory');

    // Build cells grid from occupied coords
    const cells: boolean[][] = Array.from({ length: 5 }, () => Array(12).fill(false));
    for (const cell of result.occupied) {
      if (cell.row < 5 && cell.col < 12) {
        cells[cell.row][cell.col] = true;
      }
    }
    this.tracker.initFromScan(cells, result.items, defaultAction);

    // Close inventory
    await this.gameController.pressEscape();
    await sleep(300);
  }

  /** Startup clear: scan inventory, deposit everything to stash. */
  async clearToStash(): Promise<void> {
    logger.info('Checking inventory for leftover items...');
    await this.scanInventory('stash');

    if (this.tracker.getItems().length === 0) {
      logger.info('Inventory empty, nothing to clear');
      return;
    }

    logger.info({ items: this.tracker.getItems().length }, 'Found leftover items, depositing to stash');
    await this.depositItemsToStash(this.tracker.getItems());
    this.tracker.clear();
    logger.info('Inventory cleared to stash');
  }

  /** Ensure we are at own hideout, travel if needed. */
  async ensureAtOwnHideout(): Promise<boolean> {
    if (this.atOwnHideout) {
      logger.info('Already at own hideout');
      return true;
    }

    await this.gameController.focusGame();
    await sleep(300);

    const arrived = await this.waitForAreaTransition(
      this.config.travelTimeoutMs,
      () => this.gameController.goToHideout(),
    );
    if (!arrived) {
      logger.error('Timed out going to own hideout');
      return false;
    }

    await sleep(1500); // Wait for hideout to render
    this.atOwnHideout = true;
    this.currentSellerAccount = '';
    return true;
  }

  /** Open stash and Ctrl+click given items to deposit. */
  async depositItemsToStash(items: PlacedItem[]): Promise<void> {
    if (items.length === 0) return;

    const stashPos = await this.findAndClickNameplate('Stash');
    if (!stashPos) {
      logger.error('Could not find Stash nameplate');
      return;
    }
    await sleep(1000); // Wait for stash to open

    const inventoryLayout = GRID_LAYOUTS.inventory;
    logger.info({ count: items.length }, 'Depositing items to stash');

    await this.gameController.holdCtrl();
    for (const item of items) {
      const center = this.screenReader.grid.getCellCenter(inventoryLayout, item.row, item.col);
      await this.gameController.leftClickAt(center.x, center.y);
      await sleep(150);
    }
    await this.gameController.releaseCtrl();
    await sleep(500);

    // Close stash
    await this.gameController.pressEscape();
    await sleep(500);

    logger.info({ deposited: items.length }, 'Items deposited to stash');
  }

  /** Open salvage bench, template-match salvage button, Ctrl+click items. */
  async salvageItems(items: PlacedItem[]): Promise<boolean> {
    if (items.length === 0) return true;

    const salvageNameplate = await this.findAndClickNameplate('SALVAGE BENCH');
    if (!salvageNameplate) {
      logger.error('Could not find Salvage nameplate');
      return false;
    }
    await sleep(1000); // Wait for salvage bench UI to open

    // Template-match salvage.png to activate salvage mode
    const salvageBtn = await this.screenReader.templateMatch(SALVAGE_TEMPLATE);
    if (salvageBtn) {
      await this.gameController.leftClickAt(salvageBtn.x, salvageBtn.y);
      await sleep(500);
    } else {
      logger.warn('Could not find salvage button via template match, trying to proceed anyway');
    }

    // CTRL+Click each inventory item to salvage
    const inventoryLayout = GRID_LAYOUTS.inventory;
    logger.info({ count: items.length }, 'Salvaging inventory items');

    await this.gameController.holdCtrl();
    for (const item of items) {
      const center = this.screenReader.grid.getCellCenter(inventoryLayout, item.row, item.col);
      await this.gameController.leftClickAt(center.x, center.y);
      await sleep(150);
    }
    await this.gameController.releaseCtrl();
    await sleep(500);

    // Close salvage bench
    await this.gameController.pressEscape();
    await sleep(500);

    return true;
  }

  /**
   * Full post-purchase processing cycle:
   * 1. Go home
   * 2. Salvage 'salvage' items if any
   * 3. Re-scan inventory (picks up salvage materials)
   * 4. Deposit everything to stash
   * 5. Clear tracker
   */
  async processInventory(): Promise<void> {
    try {
      // Step 1: ensure at own hideout
      const home = await this.ensureAtOwnHideout();
      if (!home) {
        logger.error('Cannot process inventory: failed to reach hideout');
        return;
      }

      // Step 2: salvage items tagged 'salvage'
      if (this.tracker.hasItemsWithAction('salvage')) {
        const salvageItems = this.tracker.getItemsByAction('salvage');
        const salvaged = await this.salvageItems(salvageItems);
        if (salvaged) {
          this.tracker.removeItemsByAction('salvage');
        } else {
          logger.warn('Salvage failed, depositing all items to stash instead');
        }
      }

      // Step 3: re-scan inventory (picks up salvage materials + any remaining items)
      await this.scanInventory('stash');

      // Step 4: deposit all remaining items to stash
      const allItems = this.tracker.getItems();
      if (allItems.length > 0) {
        await this.depositItemsToStash(allItems);
      }

      // Step 5: clear tracker
      this.tracker.clear();
      logger.info('Inventory processing complete');
    } catch (err) {
      logger.error({ err }, 'Inventory processing failed');

      // Try to recover UI state
      try {
        await this.gameController.pressEscape();
        await sleep(300);
      } catch {
        // Best-effort
      }

      this.tracker.clear();
    }
  }

  /** Find and click a nameplate by OCR text (fuzzy, with retries). */
  async findAndClickNameplate(
    name: string,
    maxRetries: number = 3,
    retryDelayMs: number = 1000,
  ): Promise<{ x: number; y: number } | null> {
    for (let attempt = 1; attempt <= maxRetries; attempt++) {
      logger.info({ name, attempt, maxRetries }, 'Searching for nameplate...');
      const pos = await this.screenReader.findTextOnScreen(name, true);

      if (pos) {
        logger.info({ name, x: pos.x, y: pos.y }, 'Clicking nameplate');
        await this.gameController.leftClickAt(pos.x, pos.y);
        return pos;
      }

      if (attempt < maxRetries) {
        await sleep(retryDelayMs);
      }
    }

    logger.warn({ name, maxRetries }, 'Nameplate not found after all retries');
    return null;
  }

  /**
   * Wait for area transition via Client.txt log.
   * If `triggerAction` is provided, the listener is registered BEFORE the action
   * executes, preventing the race where the event fires before we listen.
   */
  waitForAreaTransition(
    timeoutMs: number,
    triggerAction?: () => Promise<void>,
  ): Promise<boolean> {
    return new Promise((resolve) => {
      let resolved = false;

      const timer = setTimeout(() => {
        if (!resolved) {
          resolved = true;
          this.logWatcher.removeListener('area-entered', handler);
          resolve(false);
        }
      }, timeoutMs);

      const handler = () => {
        if (!resolved) {
          resolved = true;
          clearTimeout(timer);
          resolve(true);
        }
      };

      // Register listener FIRST
      this.logWatcher.once('area-entered', handler);

      // THEN trigger the action that causes the transition
      if (triggerAction) {
        triggerAction().catch(() => {
          if (!resolved) {
            resolved = true;
            clearTimeout(timer);
            this.logWatcher.removeListener('area-entered', handler);
            resolve(false);
          }
        });
      }
    });
  }

  /** Get inventory state for dashboard display. */
  getInventoryState(): { grid: boolean[][]; items: { row: number; col: number; w: number; h: number }[]; free: number } {
    return {
      grid: this.tracker.getGrid(),
      items: this.tracker.getItems(),
      free: this.tracker.freeCells,
    };
  }
}