import { ref, computed, h } from 'vue';

const DockPanel = {
  name: 'DockPanel',
  props: {
    panel: {
      type: Object,
      required: true
    },
    position: {
      type: String,
      required: true
    },
    index: {
      type: Number,
      required: true
    }
  },
  emits: ['close', 'float', 'collapse', 'expand', 'move', 'showContextMenu'],
  setup(props, { emit }) {
    const isDragging = ref(false)
    const dragStart = ref({ x: 0, y: 0 })

    // 简化样式计算逻辑，大部分样式通过CSS类实现
    const panelStyle = computed(() => {
      const style = {}
      
      // 尺寸样式
      if (props.panel.width) {
        style.width = `${props.panel.width}px`
      }
      if (props.panel.height) {
        style.height = `${props.panel.height}px`
      }
      
      // 折叠状态样式
      if (props.panel.isCollapsed) {
        if (props.position === 'left' || props.position === 'right') {
          style.width = '40px'
        } else {
          style.height = '40px'
        }
      }
      
      return style
    })

    const handleClose = () => {
      emit('close', props.panel.id)
    }

    const handleFloat = () => {
      emit('float', props.panel.id)
    }

    const handleCollapse = () => {
      emit('collapse', props.panel.id)
    }

    const handleExpand = () => {
      emit('expand', props.panel.id)
    }

    const handleDragStart = (e) => {
      isDragging.value = true
      dragStart.value = { x: e.clientX, y: e.clientY }
      e.stopPropagation()
    }

    const handleDragMove = (e) => {
      if (isDragging.value) {
        const dx = e.clientX - dragStart.value.x
        const dy = e.clientY - dragStart.value.y
        emit('move', props.panel.id, { x: dx, y: dy })
        dragStart.value = { x: e.clientX, y: e.clientY }
        e.preventDefault()
        e.stopPropagation()
      }
    }

    const handleDragEnd = () => {
      isDragging.value = false
    }

    const handleContextMenu = (e) => {
      e.preventDefault()
      emit('showContextMenu', props.panel.id, { x: e.clientX, y: e.clientY })
    }

    const renderIcon = () => {
      if (props.panel.icon) {
        return h('div', { class: 'dock-panel-icon' }, props.panel.icon)
      }
      return null
    }

    const renderTitle = () => {
      if (props.panel.title) {
        return h('div', { class: 'dock-panel-title' }, props.panel.title)
      }
      return null
    }

    const renderContent = () => {
      if (props.panel.content) {
        // 检查内容是否是HTML字符串
        if (typeof props.panel.content === 'string' && props.panel.content.includes('<')) {
          // 对于HTML字符串，创建一个div容器并使用innerHTML设置内容
          const div = document.createElement('div');
          div.innerHTML = props.panel.content;
          return h('div', { 
            class: 'dock-panel-html-content',
            innerHTML: props.panel.content
          });
        } else {
          // 对于组件或普通文本，正常处理
          return h(props.panel.content, { 
            panelId: props.panel.id,
            ...props.panel.props 
          })
        }
      }
      return h('div', { class: 'dock-panel-empty-content' }, 'Empty Panel')
    }

    return () => {
      // 面板根元素
      return h('div', {
        class: [
          'dock-panel',
          `dock-panel-${props.position}`,
          { 'dock-panel-collapsed': props.panel.isCollapsed }
        ],
        style: panelStyle.value,
        onMousedown: handleDragStart,
        onMousemove: handleDragMove,
        onMouseup: handleDragEnd,
        onMouseleave: handleDragEnd,
        onContextmenu: handleContextMenu
      }, [
        // 折叠状态下的展开按钮
        props.panel.isCollapsed ? (
          h('div', {
            class: 'dock-panel-expand-btn',
            onClick: handleExpand,
            title: props.panel.title
          }, renderIcon())
        ) : (
          // 非折叠状态
          [
            // 标题栏
            h('div', {
              class: 'dock-panel-titlebar'
            }, [
              renderIcon(),
              renderTitle(),
              h('div', { class: 'dock-panel-actions' }, [
                h('button', {
                  class: 'dock-panel-btn dock-panel-collapse-btn',
                  onClick: handleCollapse,
                  title: 'Collapse'
                }, '◀'),
                h('button', {
                  class: 'dock-panel-btn dock-panel-float-btn',
                  onClick: handleFloat,
                  title: 'Float'
                }, '↗'),
                h('button', {
                  class: 'dock-panel-btn dock-panel-close-btn',
                  onClick: handleClose,
                  title: 'Close'
                }, '×')
              ])
            ]),
            // 内容区
            h('div', { class: 'dock-panel-content' }, renderContent())
          ]
        )
      ])
    }
  }
}

export default DockPanel