const path = require('path');

/**
 * AppState - Manages application state
 */
class AppState {
  constructor() {
    this.currentDirectory = null;
    this.currentFiles = [];
    this.currentShow = null;
    this.currentSeasons = [];
    this.currentEpisodes = [];
    this.selectedSeasonEpisodeCount = 0;
    this.isUpdatingEpisodeNumbers = false;
    
    // Navigation stack for folder navigation
    this.navigationStack = [];
    this.currentDepth = 0;
  }

  /**
   * Set the current directory
   * @param {string} directory - Directory path
   */
  setCurrentDirectory(directory) {
    this.currentDirectory = directory;
  }

  /**
   * Get the current directory
   * @returns {string|null} Current directory path
   */
  getCurrentDirectory() {
    return this.currentDirectory;
  }

  /**
   * Set current files
   * @param {Array} files - Array of file objects
   */
  setCurrentFiles(files) {
    this.currentFiles = files;
  }

  /**
   * Get current files
   * @returns {Array} Array of file objects
   */
  getCurrentFiles() {
    return this.currentFiles;
  }

  /**
   * Set current show
   * @param {Object} show - Show object
   */
  setCurrentShow(show) {
    this.currentShow = show;
  }

  /**
   * Get current show
   * @returns {Object|null} Current show object
   */
  getCurrentShow() {
    return this.currentShow;
  }

  /**
   * Set current seasons
   * @param {Array} seasons - Array of season objects
   */
  setCurrentSeasons(seasons) {
    this.currentSeasons = seasons;
  }

  /**
   * Get current seasons
   * @returns {Array} Array of season objects
   */
  getCurrentSeasons() {
    return this.currentSeasons;
  }

  /**
   * Set current episodes
   * @param {Array} episodes - Array of episode objects
   */
  setCurrentEpisodes(episodes) {
    this.currentEpisodes = episodes;
  }

  /**
   * Get current episodes
   * @returns {Array} Array of episode objects
   */
  getCurrentEpisodes() {
    return this.currentEpisodes;
  }

  /**
   * Set selected season episode count
   * @param {number} count - Episode count
   */
  setSelectedSeasonEpisodeCount(count) {
    this.selectedSeasonEpisodeCount = count;
  }

  /**
   * Get selected season episode count
   * @returns {number} Episode count
   */
  getSelectedSeasonEpisodeCount() {
    return this.selectedSeasonEpisodeCount;
  }

  /**
   * Check if episode numbers are currently updating
   * @returns {boolean} True if updating
   */
  isUpdatingEpisodeNumbers() {
    return this.isUpdatingEpisodeNumbers;
  }

  /**
   * Set episode numbers updating flag
   * @param {boolean} updating - Updating state
   */
  setUpdatingEpisodeNumbers(updating) {
    this.isUpdatingEpisodeNumbers = updating;
  }

  /**
   * Reset state to initial values
   */
  reset() {
    this.currentDirectory = null;
    this.currentFiles = [];
    this.currentShow = null;
    this.currentSeasons = [];
    this.currentEpisodes = [];
    this.selectedSeasonEpisodeCount = 0;
    this.isUpdatingEpisodeNumbers = false;
    this.navigationStack = [];
    this.currentDepth = 0;
  }

  /**
   * Add directory to navigation stack
   * @param {string} directory - Directory path to add
   */
  addToNavigationStack(directory) {
    // Remove any forward history if navigating from middle of stack
    this.navigationStack = this.navigationStack.slice(0, this.currentDepth + 1);
    this.navigationStack.push(directory);
    this.currentDepth = this.navigationStack.length - 1;
  }

  /**
   * Go back to previous directory in navigation stack
   * @returns {string|null} Previous directory path or null if at root
   */
  goBack() {
    if (this.canGoBack()) {
      this.navigationStack.pop();
      this.currentDepth--;
      return this.navigationStack[this.currentDepth];
    }
    return null;
  }

  /**
   * Check if can go back in navigation history
   * @returns {boolean} True if can go back
   */
  canGoBack() {
    return this.currentDepth > 0;
  }

  /**
   * Get current directory from navigation stack
   * @returns {string|null} Current directory path
   */
  getCurrentDirectoryFromStack() {
    return this.navigationStack[this.currentDepth] || null;
  }

  /**
   * Get navigation depth
   * @returns {number} Current navigation depth
   */
  getNavigationDepth() {
    return this.currentDepth;
  }

  /**
   * Get navigation stack
   * @returns {Array} Array of visited directories
   */
  getNavigationStack() {
    return this.navigationStack;
  }
}

module.exports = AppState;