import { defineStore } from 'pinia'
import { ref, watch, computed } from 'vue'

// 设计组件实例
export interface DesignComponentInstance {
  id: string                           // 实例唯一ID
  componentId: string                  // 设计组件类型ID
  name: string                         // 显示名称
  props: Record<string, any>           // 属性值
}

// 设计组件定义
export interface DesignComponentMeta {
  id: string
  name: string
  description: string
  props: Record<string, any>
}

// 生成唯一ID
const generateId = () => Math.random().toString(36).substring(2, 9)

export const useDesignStore = defineStore('design', () => {
  // 设计中心已添加的组件实例列表
  const components = ref<DesignComponentInstance[]>([])
  
  // 当前选中的组件实例ID
  const selectedId = ref<string | null>(null)
  
  // 设计组件元数据缓存
  const componentMetas = ref<DesignComponentMeta[]>([])
  
  // 是否已加载
  const isLoaded = ref(false)

  // 当前选中的组件实例
  const selectedComponent = computed(() => {
    if (!selectedId.value) return null
    return components.value.find(c => c.id === selectedId.value) || null
  })

  // 当前选中组件的元数据（属性定义）
  const selectedComponentMeta = computed(() => {
    if (!selectedComponent.value) return null
    return componentMetas.value.find(m => m.id === selectedComponent.value!.componentId) || null
  })

  // 加载设计组件元数据
  const loadComponentMetas = async () => {
    try {
      const response = await fetch('/api/design-components')
      if (response.ok) {
        componentMetas.value = await response.json()
      }
    } catch (error) {
      console.error('加载设计组件元数据失败:', error)
    }
  }

  // 加载设计中心状态
  const loadState = async () => {
    try {
      const response = await fetch('/api/design-state')
      if (response.ok) {
        const data = await response.json()
        if (data.components) {
          components.value = data.components
        }
        if (data.selectedId) {
          selectedId.value = data.selectedId
        }
      }
    } catch (error) {
      console.log('使用默认设计状态')
    }
    isLoaded.value = true
  }

  // 保存设计中心状态
  const saveState = async () => {
    try {
      await fetch('/api/design-state', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          components: components.value,
          selectedId: selectedId.value,
          lastUpdated: new Date().toISOString()
        })
      })
    } catch (error) {
      console.error('保存设计状态失败:', error)
    }
  }

  // 监听变化自动保存
  watch([components, selectedId], () => {
    if (isLoaded.value) {
      saveState()
    }
  }, { deep: true })

  // 添加设计组件到设计中心
  const addComponent = (componentId: string) => {
    const meta = componentMetas.value.find(m => m.id === componentId)
    if (!meta) {
      console.warn('未找到设计组件:', componentId)
      return
    }
    
    // 计算同类型组件的数量
    const sameTypeCount = components.value.filter(c => c.componentId === componentId).length
    
    const instance: DesignComponentInstance = {
      id: generateId(),
      componentId: componentId,
      name: `${meta.name} ${sameTypeCount + 1}`,
      props: JSON.parse(JSON.stringify(meta.props))
    }
    
    components.value.push(instance)
    selectedId.value = instance.id
  }

  // 移除设计组件
  const removeComponent = (instanceId: string) => {
    const index = components.value.findIndex(c => c.id === instanceId)
    if (index > -1) {
      components.value.splice(index, 1)
      if (selectedId.value === instanceId) {
        selectedId.value = components.value.length > 0 ? components.value[0].id : null
      }
    }
  }

  // 选中设计组件
  const selectComponent = (instanceId: string | null) => {
    selectedId.value = instanceId
  }

  // 更新组件属性
  const updateComponentProps = (instanceId: string, key: string, value: any) => {
    const component = components.value.find(c => c.id === instanceId)
    if (component) {
      component.props[key] = value
    }
  }

  // 重新排序组件（拖拽后）
  const reorderComponents = (newOrder: DesignComponentInstance[]) => {
    components.value = newOrder
  }

  // 获取组件元数据
  const getComponentMeta = (componentId: string) => {
    return componentMetas.value.find(m => m.id === componentId)
  }

  // 初始化
  const init = async () => {
    await loadComponentMetas()
    await loadState()
  }

  return {
    components,
    selectedId,
    selectedComponent,
    selectedComponentMeta,
    componentMetas,
    isLoaded,
    init,
    loadComponentMetas,
    loadState,
    saveState,
    addComponent,
    removeComponent,
    selectComponent,
    updateComponentProps,
    reorderComponents,
    getComponentMeta
  }
})