const { ipcRenderer } = require('electron');
const AppState = require('./AppState');
const FileListManager = require('./FileListManager');
const TagManager = require('./TagManager');
const EpisodeManager = require('./EpisodeManager');
const SearchManager = require('./SearchManager');
const FileManager = require('./FileManager');
const ModalManager = require('./ModalManager');
const ProgressManager = require('./ProgressManager');

/**
 * UIManager - Main coordinator for UI functionality
 */
class UIManager {
  constructor() {
    // Initialize managers
    this.appState = new AppState();
    this.fileManager = new FileManager();
    this.modalManager = new ModalManager();

    // Get DOM elements
    this.selectDirBtn = document.getElementById('select-dir-btn');
    this.selectedDirEl = document.getElementById('selected-dir');
    this.searchInput = document.getElementById('search-input');
    this.searchResultsEl = document.getElementById('search-results');
    this.fileListEl = document.getElementById('file-list');
    this.showDetailsEl = document.getElementById('show-details');
    this.progressContainer = document.getElementById('progress-container');
    this.progressText = document.getElementById('progress-text');
    this.progressCount = document.getElementById('progress-count');

    // Initialize UI managers
    this.fileListManager = new FileListManager(this.fileListEl);
    this.tagManager = new TagManager();
    this.episodeManager = new EpisodeManager();
    this.searchManager = new SearchManager(this.searchInput, this.searchResultsEl);
    this.progressManager = new ProgressManager(
      this.progressContainer,
      this.progressText,
      this.progressCount
    );

    // Set up event listeners
    this._setupEventListeners();
  }

  /**
   * Set up all event listeners
   * @private
   */
  _setupEventListeners() {
    // Select directory button
    this.selectDirBtn.addEventListener('click', () => this._handleSelectDirectory());

    // Search input with debounce
    this.searchInput.addEventListener('input', this._debounce(() => this._handleSearch(), 300));

    // Episode number editing
    document.addEventListener('click', (e) => {
      if (e.target.classList.contains('episode-number')) {
        e.stopPropagation();
        this.episodeManager.makeEpisodeRangeEditable(e.target);
      }
    });

    // Begin mapping button
    const beginMappingBtn = document.getElementById('begin-mapping-btn');
    if (beginMappingBtn) {
      beginMappingBtn.addEventListener('click', () => this._handleBeginMapping());
    }

    // Floating circle (play button) to move all tagged files
    const taggedCircle = document.getElementById('tagged-circle');
    if (taggedCircle) {
      taggedCircle.addEventListener('click', () => this._handleMoveAllTaggedFiles());
    }

    // Listen for scan progress updates from main process
    ipcRenderer.on('scan-progress', (event, { current, total, fileName }) => {
      this.progressManager.updateProgress(current, total, fileName);
    });

    // Listen for auto-select directory message
    window.addEventListener('message', (event) => {
      if (event.data.type === 'auto-select-directory') {
        this._handleAutoSelectDirectory(event.data.directory);
      }
    });

    // Listen for auto-select directory from main process
    ipcRenderer.on('auto-select-directory', (event, directory) => {
      this._handleAutoSelectDirectory(directory);
    });

    // Initialize tagged count on page load
    this._updateTaggedCount();
  }

  /**
   * Handle select directory
   * @private
   */
  async _handleSelectDirectory() {
    try {
      const result = await this.fileManager.selectDirectory();

      if (result.success) {
        const directory = result.directory;
        this.appState.setCurrentDirectory(directory);
        this.selectedDirEl.textContent = `Selected: ${directory}`;

        // Log audit event for directory selection
        await this._logAuditEvent('select_directory', { directory: directory });

        // Scan the directory for media files
        await this._scanDirectory(directory);
      } else {
        throw new Error(result.error);
      }
    } catch (error) {
      console.error('Error selecting directory:', error);
      alert(`Error: ${error.message}`);
    }
  }

  /**
   * Handle auto-select directory
   * @param {string} directory - Directory path
   * @private
   */
  async _handleAutoSelectDirectory(directory) {
    try {
      console.log('Auto-selecting directory:', directory);

      this.appState.setCurrentDirectory(directory);
      this.selectedDirEl.textContent = `Selected: ${directory}`;

      // Log audit event for directory selection
      await this._logAuditEvent('select_directory', { directory: directory });

      // Scan the directory for media files
      await this._scanDirectory(directory);
    } catch (error) {
      console.error('Error auto-selecting directory:', error);
      alert(`Error: ${error.message}`);
    }
  }

  /**
   * Open a specific directory
   * @param {string} directory - Directory path
   */
  async openDirectory(directory) {
    try {
      console.log('Opening directory:', directory);

      // Set the current directory
      this.appState.setCurrentDirectory(directory);
      this.selectedDirEl.textContent = `Selected: ${directory}`;

      // Log audit event for directory selection
      await this._logAuditEvent('select_directory', { directory: directory });

      // Scan the directory for media files
      await this._scanDirectory(directory);
    } catch (error) {
      console.error('Error opening directory:', error);
      alert(`Error: ${error.message}`);
    }
  }

  /**
   * Handle search
   * @private
   */
  async _handleSearch() {
    const query = this.searchInput.value.trim();
    await this.searchManager.searchShows(query);
  }

  /**
   * Scan directory
   * @param {string} directoryPath - Directory path
   * @private
   */
  async _scanDirectory(directoryPath) {
    try {
      // Show progress bar
      this.progressManager.showProgress();

      const result = await this.fileManager.scanDirectory(directoryPath);

      // Hide progress bar
      this.progressManager.hideProgress();

      if (result.success) {
        this.appState.setCurrentFiles(result.files);
        this.fileListManager.displayFiles(result.files);
      } else {
        throw new Error(result.error);
      }
    } catch (error) {
      this.progressManager.hideProgress();
      console.error('Error scanning directory:', error);
      alert(`Error scanning directory: ${error.message}`);
    }
  }

  /**
   * Handle begin mapping
   * @private
   */
  async _handleBeginMapping() {
    const btn = document.getElementById('begin-mapping-btn');

    // Get all media file items (not folders)
    const fileItems = this.fileListManager.getMediaFileItems();

    if (fileItems.length === 0) {
      alert('No media files to map. Please select a directory first.');
      return;
    }

    if (!this.appState.getCurrentDirectory()) {
      alert('No directory selected.');
      return;
    }

    // Disable button during processing
    btn.disabled = true;
    btn.textContent = 'Mapping...';

    try {
      // Collect file data with episode ranges from UI order
      const filesToMap = this.fileManager.collectFileData(this.fileListEl);

      // Get TVDB ID from current show if selected
      const tvdbId = this.appState.getCurrentShow() ? this.appState.getCurrentShow().id : null;

      const result = await this.fileManager.beginMapping(
        this.appState.getCurrentDirectory(),
        filesToMap,
        tvdbId
      );

      if (result.success) {
        alert('Mapping Complete!');
        // Update currentDirectory if it changed (show folder was renamed)
        const newDir = result.newDirectory || this.appState.getCurrentDirectory();
        this.appState.setCurrentDirectory(newDir);
        // Refresh the file list to show new names
        await this.openDirectory(newDir);
      } else {
        alert('Mapping failed: ' + (result.error || 'Unknown error'));
      }
    } catch (error) {
      console.error('Mapping error:', error);
      alert('Mapping failed: ' + error.message);
    } finally {
      btn.disabled = false;
      btn.textContent = 'Begin Mapping';
    }
  }

  /**
   * Handle move all tagged files
   * @private
   */
  async _handleMoveAllTaggedFiles() {
    await this.tagManager.moveAllTaggedFiles(
      () => this._updateTaggedCount(),
      () => this.fileListManager.updateEpisodeNumbers(),
      () => this._checkEpisodeCountMatch()
    );
  }

  /**
   * Update tagged count
   * @private
   */
  _updateTaggedCount() {
    const taggedItems = document.querySelectorAll('.file-item[data-tagged-extra], .file-item[data-tagged-commentary], .file-item[data-tagged-delete]');
    const count = taggedItems.length;
    const taggedCircle = document.getElementById('tagged-circle');
    const taggedCount = document.getElementById('tagged-count');

    if (taggedCount) {
      taggedCount.textContent = count;
    }

    // Animate the circle position based on count
    if (taggedCircle) {
      if (count === 0) {
        // Move down out of sight
        taggedCircle.style.transform = 'translateY(100px)';
        taggedCircle.style.bottom = '-100px';
      } else {
        // Move up to show count (appears at the same spot at bottom right)
        taggedCircle.style.transform = 'translateY(0)';
        taggedCircle.style.bottom = '20px';
      }
    }
  }

  /**
   * Check episode count match
   * @private
   */
  _checkEpisodeCountMatch() {
    // Count only actual media files (not folders)
    const mediaFiles = this.fileListManager.getMediaFileItems();

    // Calculate total episode range (sum of all episode ranges)
    let totalEpisodeCount = 0;
    let lastEpisodeEnd = 0;

    mediaFiles.forEach((item, index) => {
      const episodeEl = item.querySelector('.episode-number');
      if (episodeEl) {
        const episodeStart = parseInt(episodeEl.dataset.episodeStart || (index + 1));
        const episodeEnd = parseInt(episodeEl.dataset.episodeEnd || episodeStart);

        // Calculate episodes in this range
        const rangeSize = episodeEnd - episodeStart + 1;
        totalEpisodeCount += rangeSize;

        // Track the last episode end for sequential checking
        if (index === 0 || episodeEnd > lastEpisodeEnd) {
          lastEpisodeEnd = episodeEnd;
        }
      }
    });

    // Use lastEpisodeEnd for comparison (handles ranges properly)
    const selectedSeasonEpisodeCount = this.appState.getSelectedSeasonEpisodeCount();
    if (selectedSeasonEpisodeCount > 0 && lastEpisodeEnd === selectedSeasonEpisodeCount) {
      // Perfect match - add green outline
      this.fileListEl.style.border = '3px solid #28a745';
      this.fileListEl.style.boxShadow = '0 0 15px rgba(40, 167, 69, 0.4)';
    } else {
      // No match or no season selected - remove green outline
      this.fileListEl.style.border = '';
      this.fileListEl.style.boxShadow = '';
    }
  }

  /**
   * Log audit event
   * @param {string} action - Action type
   * @param {Object} details - Event details
   * @private
   */
  async _logAuditEvent(action, details) {
    const currentDirectory = this.appState.getCurrentDirectory();
    if (currentDirectory) {
      await this.fileManager.logAuditEvent(currentDirectory, action, details);
    }
  }

  /**
   * Debounce function
   * @param {Function} func - Function to debounce
   * @param {number} wait - Wait time in ms
   * @returns {Function} Debounced function
   * @private
   */
  _debounce(func, wait) {
    let timeout;
    return function executedFunction(...args) {
      const later = () => {
        clearTimeout(timeout);
        func(...args);
      };
      clearTimeout(timeout);
      timeout = setTimeout(later, wait);
    };
  }

  /**
   * Display created folder
   * @param {string} folderName - Folder name
   */
  displayCreatedFolder(folderName) {
    // Check if folder entry already exists
    const existingFolder = document.querySelector(`.folder-item[data-folder-name="${folderName}"]`);
    if (existingFolder) {
      // Update the file count
      const countEl = existingFolder.querySelector('.folder-count');
      if (countEl) {
        const currentCount = parseInt(countEl.textContent) || 0;
        countEl.textContent = currentCount + 1;
      }
      return;
    }

    // Create folder item element
    const folderItem = document.createElement('div');
    folderItem.className = 'folder-item';
    folderItem.setAttribute('data-folder-name', folderName);

    let displayName, folderIcon, folderColor;
    if (folderName === 'extra') {
      displayName = 'extras';
      folderIcon = '📁';
      folderColor = '#FFD700';
    } else if (folderName === 'commentary') {
      displayName = 'commentary';
      folderIcon = '💬';
      folderColor = '#17a2b8';
    } else if (folderName === 'delete') {
      displayName = 'delete';
      folderIcon = '🗑️';
      folderColor = '#dc3545';
    }

    folderItem.innerHTML = `
      <div class="folder-icon" style="font-size: 24px;">${folderIcon}</div>
      <div class="folder-name" style="font-weight: bold; color: ${folderColor};">${displayName}</div>
      <div class="folder-count" style="background-color: ${folderColor}; color: white; border-radius: 12px; padding: 2px 8px; font-size: 12px;">1</div>
    `;

    folderItem.style.cssText = `
      display: flex;
      align-items: center;
      gap: 10px;
      padding: 12px;
      margin-bottom: 8px;
      background-color: #16213e;
      border: 2px solid ${folderColor};
      border-radius: 8px;
      cursor: pointer;
    `;

    // Insert at the top of the file list
    if (this.fileListEl.firstChild) {
      this.fileListEl.insertBefore(folderItem, this.fileListEl.firstChild);
    } else {
      this.fileListEl.appendChild(folderItem);
    }

    console.log(`Folder "${displayName}" displayed in UI`);
  }

  /**
   * Make file name editable
   * @param {HTMLElement} element - File name element
   */
  async makeEditable(element) {
    // Prevent editing if already in edit mode
    if (element.contentEditable === 'true') return;

    // Store original text
    const originalText = element.textContent;

    // Make element editable
    element.contentEditable = 'true';
    element.focus();
    element.classList.add('editing');

    // Select all text when editing starts
    const range = document.createRange();
    range.selectNodeContents(element);
    const selection = window.getSelection();
    selection.removeAllRanges();
    selection.addRange(range);

    // Handle saving when user finishes editing
    const saveEdit = async () => {
      if (element.textContent.trim() !== originalText.trim()) {
        // Send request to main process to rename the file
        try {
          const result = await this.fileManager.renameFile(
            element.dataset.filePath,
            element.textContent.trim()
          );

          if (result.success) {
            console.log('File renamed successfully:', result.message);
            // Update the file name in the UI to reflect the change
            element.textContent = element.textContent.trim();

            // Also update the data attribute to reflect the new path
            const oldPath = element.dataset.filePath;
            const newPath = oldPath.substring(0, oldPath.lastIndexOf(path.sep) + 1) + element.textContent.trim();
            element.dataset.filePath = newPath;
          } else {
            console.error('Failed to rename file:', result.error);
            // Revert to original name on failure
            element.textContent = originalText;
          }
        } catch (error) {
          console.error('Error renaming file:', error);
          // Revert to original name on error
          element.textContent = originalText;
        }
      }

      // Clean up
      element.contentEditable = 'false';
      element.classList.remove('editing');
    };

    // Save on Enter key or blur
    element.addEventListener('keydown', function(e) {
      if (e.key === 'Enter') {
        e.preventDefault();
        saveEdit();
      }
    });

    element.addEventListener('blur', saveEdit);
  }

  /**
   * Select show and display details
   * @param {Object} show - Show object
   */
  async selectShow(show) {
    await this.searchManager.selectShow(
      show,
      (title) => {
        document.getElementById('show-title').textContent = title;
      },
      (seasonsOrHtml) => {
        if (typeof seasonsOrHtml === 'string') {
          document.getElementById('seasons-container').innerHTML = seasonsOrHtml;
        } else {
          this.searchManager.displaySeasons(seasonsOrHtml,
            (seasonNumber) => this._handleSeasonSelect(show.id, seasonNumber),
            () => this._handleBackToSeasons()
          );
        }
      }
    );
  }

  /**
   * Handle season select
   * @param {string} showId - Show ID
   * @param {number} seasonNumber - Season number
   */
  async _handleSeasonSelect(showId, seasonNumber) {
    await this.searchManager.fetchAndDisplayEpisodes(
      showId,
      seasonNumber,
      (episodes, error) => {
        if (error) {
          document.getElementById('seasons-container').innerHTML = `
            <div style="padding: 10px; background-color: #f8d7da; color: #721c24; border-radius: 4px;">
              <p>Error loading episodes: ${error}</p>
              <p style="font-size: 12px; margin-top: 5px;">Note: This may be due to API limitations with the TVDB v4 API.</p>
            </div>
          `;
        } else {
          this.searchManager.displayEpisodes(
            episodes,
            episodes.length,
            (count) => this.appState.setSelectedSeasonEpisodeCount(count),
            (episodes) => this.searchManager.updateFileListWithEpisodeInfo(episodes, this.appState.getCurrentFiles())
          );
          this._checkEpisodeCountMatch();
        }
      }
    );
  }

  /**
   * Handle back to seasons
   */
  _handleBackToSeasons() {
    this.appState.setSelectedSeasonEpisodeCount(0);
    this._checkEpisodeCountMatch();
    // Re-display seasons would happen here
  }

  /**
   * Debug problematic file
   * @param {string} filePath - File path
   */
  async debugProblematicFile(filePath) {
    try {
      const result = await this.fileManager.logFileInfo(filePath);
      if (result.success) {
        console.log('File info:', result.fileInfo);
      } else {
        console.error('Failed to get file info:', result.error);
      }
    } catch (error) {
      console.error('Error debugging file:', error);
    }
  }
}

module.exports = UIManager;