/**
 * 布局管理器 - 统一管理面板布局的持久化、调整大小等功能
 */
import { ref, onMounted, onUnmounted } from 'vue';
import { LayoutPersistence } from './LayoutPersistence';
import { ResizeHandlers } from './ResizeHandlers';

/**
 * 布局管理器类
 * 负责统一管理面板布局的持久化、调整大小等功能
 */
export class LayoutManager {
  /**
   * 构造函数
   * @param {Object} store - Pinia store实例
   */
  constructor(store, onLayoutApplied = null) {
    this.store = store;
    this.container = ref(null);
    this.layoutPersistence = null;
    this.resizeHandlers = null;
    this.onLayoutApplied = onLayoutApplied;
  }

  /**
   * 初始化布局管理器
   */
  initialize() {
    // 创建布局持久化实例
    // 直接传入store对象，让LayoutPersistence能够访问最新的面板数据
    // 创建布局持久化实例
    // 优化：LayoutPersistence构造函数已简化，只需要store对象和storageKey
    // 传递onLayoutApplied回调，以便在布局应用完成后通知调用方
    this.layoutPersistence = new LayoutPersistence(
      this.store,
      'dockPanelLayout',
      this.onLayoutApplied
    );

    // 创建调整大小处理器
    this.resizeHandlers = new ResizeHandlers(
      this.store,
      this.container,
      this.layoutPersistence
    );

    // 初始化事件监听
    this.resizeHandlers.initialize();

    // 初始化容器引用
    this.container.value = document.querySelector('.dock-panel-container');
  }

  /**
   * 加载保存的布局
   * @returns {boolean} 是否成功加载布局
   */
  loadLayout() {
    if (!this.layoutPersistence) {
      console.error('Layout persistence is not initialized');
      return false;
    }

    try {
      return this.layoutPersistence.loadLayout();
    } catch (error) {
      console.error('Failed to load layout:', error);
      return false;
    }
  }

  /**
   * 保存当前布局
   */
  saveLayout() {
    if (!this.layoutPersistence) {
      console.error('Layout persistence is not initialized');
      return;
    }

    try {
      this.layoutPersistence.saveLayout();
    } catch (error) {
      console.error('Failed to save layout:', error);
    }
  }

  /**
   * 导出布局为JSON文件
   */
  exportLayout() {
    if (!this.layoutPersistence) {
      console.error('Layout persistence is not initialized');
      return;
    }

    try {
      this.layoutPersistence.exportLayout();
    } catch (error) {
      console.error('Failed to export layout:', error);
      throw error;
    }
  }

  /**
   * 导入布局
   * @param {string|Object} content - JSON字符串或解析后的对象
   * @returns {boolean} 是否成功导入布局
   */
  importLayout(content) {
    if (!this.layoutPersistence) {
      console.error('Layout persistence is not initialized');
      return false;
    }

    try {
      return this.layoutPersistence.importLayout(content);
    } catch (error) {
      console.error('Failed to import layout:', error);
      throw error;
    }
  }

  /**
   * 清除保存的布局
   */
  clearSavedLayout() {
    if (!this.layoutPersistence) {
      console.error('Layout persistence is not initialized');
      return;
    }

    try {
      this.layoutPersistence.clearSavedLayout();
    } catch (error) {
      console.error('Failed to clear saved layout:', error);
    }
  }

  /**
   * 检查是否有保存的布局
   * @returns {boolean} 是否有保存的布局
   */
  hasSavedLayout() {
    if (!this.layoutPersistence) {
      return false;
    }

    return this.layoutPersistence.hasSavedLayout();
  }

  /**
   * 开始调整大小
   */
  startResize(target, event) {
    if (!this.resizeHandlers) {
      console.error('Resize handlers is not initialized');
      return;
    }

    this.resizeHandlers.startResize(target, event);
  }

  /**
   * 开始面板调整大小
   */
  startPanelResize(position, panelId, panelIndex, event) {
    if (!this.resizeHandlers) {
      console.error('Resize handlers is not initialized');
      return;
    }

    this.resizeHandlers.startPanelResize(position, panelId, panelIndex, event);
  }

  /**
   * 处理鼠标移动
   */
  handleMouseMove(event, minSizes, leftPanelArea, rightPanelArea, topPanelArea, bottomPanelArea, centerPanelArea) {
    if (!this.resizeHandlers) {
      console.error('Resize handlers is not initialized');
      return;
    }

    this.resizeHandlers.handleMouseMove(event, minSizes, leftPanelArea, rightPanelArea, topPanelArea, bottomPanelArea, centerPanelArea);
  }

  /**
   * 处理鼠标松开
   */
  handleMouseUp(event, hideContextMenuCallback, checkDockZoneCallback = null) {
    if (!this.resizeHandlers) {
      console.error('Resize handlers is not initialized');
      if (hideContextMenuCallback) {
        hideContextMenuCallback();
      }
      return;
    }

    this.resizeHandlers.handleMouseUp(event, hideContextMenuCallback, checkDockZoneCallback);
  }

  /**
   * 清理资源
   */
  cleanup() {
    if (this.resizeHandlers) {
      this.resizeHandlers.cleanup();
    }
  }

  /**
   * 设置容器引用
   * @param {HTMLElement} container - 容器元素
   */
  setContainer(container) {
    this.container.value = container;
  }

  /**
   * 获取容器引用
   * @returns {HTMLElement|null} 容器元素
   */
  getContainer() {
    return this.container.value;
  }
}

/**
 * 创建LayoutManager的Vue组合式函数
 * @param {Object} store - Pinia store实例
 * @param {Function} onLayoutApplied - 布局应用完成后的回调函数
 * @returns {Object} LayoutManager实例及相关方法
 */
export function useLayoutManager(store, onLayoutApplied = null) {
  const layoutManager = new LayoutManager(store, onLayoutApplied);
  
  onMounted(() => {
    layoutManager.initialize();
  });
  
  onUnmounted(() => {
    layoutManager.cleanup();
  });
  
  return layoutManager;
}