/**
 * 工作流 Store
 * 管理工作流状态、节点类型、字段映射等
 */

import { defineStore } from 'pinia'
import { ref, computed } from 'vue'
import type {
  NodeTypeMetadata,
  WorkflowNode,
  WorkflowEdge,
  WorkflowDefinition,
  UpstreamNodeOutput,
  FieldPathNode,
  OutputParameter,
  HistoryItem,
} from '#/types/workflow'
import { MOCK_NODE_TYPES, getNodeTypeMetadata } from '#/views/workflow/vue-flow-design/mock/nodeTypes'

export const useWorkflowStore = defineStore('workflow', () => {
  // ============== 状态 ==============
  
  /** 所有可用的节点类型 */
  const nodeTypes = ref<NodeTypeMetadata[]>(MOCK_NODE_TYPES)
  
  /** 当前工作流的节点 */
  const nodes = ref<WorkflowNode[]>([])
  
  /** 当前工作流的边 */
  const edges = ref<WorkflowEdge[]>([])
  
  /** 选中的节点 ID */
  const selectedNodeId = ref<string | null>(null)
  
  /** 选中的边 ID */
  const selectedEdgeId = ref<string | null>(null)
  
  /** 历史记录 */
  const history = ref<HistoryItem[]>([])
  
  /** 历史记录索引 */
  const historyIndex = ref(-1)
  
  /** 最大历史记录数 */
  const maxHistorySize = 50
  
  /** 工作流元数据 */
  const workflowMeta = ref({
    name: '未命名工作流',
    description: '',
    id: '',
  })

  // ============== 计算属性 ==============
  
  /** 选中的节点 */
  const selectedNode = computed(() => {
    if (!selectedNodeId.value) return null
    return nodes.value.find((n) => n.id === selectedNodeId.value)
  })
  
  /** 选中的边 */
  const selectedEdge = computed(() => {
    if (!selectedEdgeId.value) return null
    return edges.value.find((e) => e.id === selectedEdgeId.value)
  })
  
  /** 是否可以撤销 */
  const canUndo = computed(() => historyIndex.value > 0)
  
  /** 是否可以重做 */
  const canRedo = computed(() => historyIndex.value < history.value.length - 1)
  
  /** 节点统计 */
  const statistics = computed(() => ({
    nodeCount: nodes.value.length,
    edgeCount: edges.value.length,
    nodesByType: nodes.value.reduce((acc, node) => {
      acc[node.type] = (acc[node.type] || 0) + 1
      return acc
    }, {} as Record<string, number>),
  }))

  // ============== 节点操作 ==============
  
  /**
   * 添加节点
   */
  function addNode(node: WorkflowNode) {
    nodes.value.push(node)
    saveHistory()
  }
  
  /**
   * 删除节点
   */
  function removeNode(nodeId: string) {
    const index = nodes.value.findIndex((n) => n.id === nodeId)
    if (index > -1) {
      nodes.value.splice(index, 1)
      // 同时删除相关的边
      edges.value = edges.value.filter(
        (e) => e.source !== nodeId && e.target !== nodeId
      )
      saveHistory()
    }
  }
  
  /**
   * 更新节点数据
   */
  function updateNode(nodeId: string, data: Partial<WorkflowNode>) {
    const node = nodes.value.find((n) => n.id === nodeId)
    if (node) {
      Object.assign(node, data)
      saveHistory()
    }
  }
  
  /**
   * 更新节点的 data 字段
   */
  function updateNodeData(nodeId: string, data: any) {
    const node = nodes.value.find((n) => n.id === nodeId)
    if (node) {
      node.data = { ...node.data, ...data }
      saveHistory()
    }
  }

  // ============== 边操作 ==============
  
  /**
   * 添加边
   */
  function addEdge(edge: WorkflowEdge) {
    edges.value.push(edge)
    saveHistory()
  }
  
  /**
   * 删除边
   */
  function removeEdge(edgeId: string) {
    const index = edges.value.findIndex((e) => e.id === edgeId)
    if (index > -1) {
      edges.value.splice(index, 1)
      saveHistory()
    }
  }

  // ============== 选择操作 ==============
  
  /**
   * 选择节点
   */
  function selectNode(nodeId: string | null) {
    selectedNodeId.value = nodeId
    selectedEdgeId.value = null
  }
  
  /**
   * 选择边
   */
  function selectEdge(edgeId: string | null) {
    selectedEdgeId.value = edgeId
    selectedNodeId.value = null
  }
  
  /**
   * 清除选择
   */
  function clearSelection() {
    selectedNodeId.value = null
    selectedEdgeId.value = null
  }

  // ============== 历史记录 ==============
  
  /**
   * 保存历史记录
   */
  function saveHistory() {
    const currentState: HistoryItem = {
      nodes: JSON.parse(JSON.stringify(nodes.value)),
      edges: JSON.parse(JSON.stringify(edges.value)),
      timestamp: Date.now(),
    }
    
    // 移除当前索引之后的历史记录
    history.value = history.value.slice(0, historyIndex.value + 1)
    
    // 添加新的历史记录
    history.value.push(currentState)
    
    // 限制历史记录大小
    if (history.value.length > maxHistorySize) {
      history.value.shift()
    } else {
      historyIndex.value++
    }
  }
  
  /**
   * 撤销
   */
  function undo() {
    if (canUndo.value) {
      historyIndex.value--
      const state = history.value[historyIndex.value]
      nodes.value = JSON.parse(JSON.stringify(state.nodes))
      edges.value = JSON.parse(JSON.stringify(state.edges))
    }
  }
  
  /**
   * 重做
   */
  function redo() {
    if (canRedo.value) {
      historyIndex.value++
      const state = history.value[historyIndex.value]
      nodes.value = JSON.parse(JSON.stringify(state.nodes))
      edges.value = JSON.parse(JSON.stringify(state.edges))
    }
  }

  // ============== 字段映射相关 ==============
  
  /**
   * 获取节点的上游节点输出（用于字段映射）
   */
  function getUpstreamOutputs(nodeId: string): UpstreamNodeOutput[] {
    const upstreamNodes: UpstreamNodeOutput[] = []
    
    // 找到所有连接到当前节点的边
    const incomingEdges = edges.value.filter((e) => e.target === nodeId)
    
    incomingEdges.forEach((edge) => {
      const sourceNode = nodes.value.find((n) => n.id === edge.source)
      if (sourceNode) {
        const nodeType = getNodeTypeMetadata(sourceNode.type)
        if (nodeType) {
          const fieldTree = buildFieldTree(nodeType.outputs, edge.source)
          upstreamNodes.push({
            nodeId: sourceNode.id,
            nodeName: sourceNode.data.label,
            outputs: nodeType.outputs,
            fieldTree,
          })
        }
      }
    })
    
    return upstreamNodes
  }
  
  /**
   * 从输出参数构建字段树
   */
  function buildFieldTree(
    outputs: OutputParameter[],
    nodeId: string
  ): FieldPathNode[] {
    const tree: FieldPathNode[] = []
    
    outputs.forEach((output) => {
      const rootPath = `nodes.${nodeId}.output.${output.id}`
      
      if (output.schema) {
        // 有 schema，构建详细的字段树
        const children = buildFieldTreeFromSchema(output.schema, rootPath)
        tree.push({
          key: output.id,
          path: rootPath,
          type: output.type,
          description: output.description,
          children: children.length > 0 ? children : undefined,
          isLeaf: children.length === 0,
        })
      } else {
        // 没有 schema，只显示顶级字段
        tree.push({
          key: output.id,
          path: rootPath,
          type: output.type,
          description: output.description,
          isLeaf: true,
        })
      }
    })
    
    return tree
  }
  
  /**
   * 从 Schema 递归构建字段树
   */
  function buildFieldTreeFromSchema(
    schema: any,
    basePath: string
  ): FieldPathNode[] {
    const nodes: FieldPathNode[] = []
    
    if (schema.type === 'object' && schema.properties) {
      Object.entries(schema.properties).forEach(([key, propSchema]: [string, any]) => {
        const path = `${basePath}.${key}`
        const children = buildFieldTreeFromSchema(propSchema, path)
        
        nodes.push({
          key,
          path,
          type: propSchema.type || 'any',
          description: propSchema.description,
          example: propSchema.example,
          children: children.length > 0 ? children : undefined,
          isLeaf: children.length === 0,
        })
      })
    } else if (schema.type === 'array' && schema.items) {
      // 数组类型，添加 [0] 示例
      const path = `${basePath}[0]`
      const children = buildFieldTreeFromSchema(schema.items, path)
      
      if (children.length > 0) {
        nodes.push({
          key: '[0]',
          path,
          type: 'object',
          description: '数组元素（示例）',
          children,
          isLeaf: false,
        })
      }
    }
    
    return nodes
  }
  
  /**
   * 生成字段表达式
   */
  function generateFieldExpression(fieldPath: string): string {
    return `\${${fieldPath}}`
  }

  // ============== 工作流操作 ==============
  
  /**
   * 加载工作流
   */
  function loadWorkflow(workflow: WorkflowDefinition) {
    nodes.value = workflow.nodes
    edges.value = workflow.edges
    workflowMeta.value = {
      name: workflow.name,
      description: workflow.description || '',
      id: workflow.id || '',
    }
    
    // 重置历史记录
    history.value = [{
      nodes: JSON.parse(JSON.stringify(nodes.value)),
      edges: JSON.parse(JSON.stringify(edges.value)),
      timestamp: Date.now(),
    }]
    historyIndex.value = 0
  }
  
  /**
   * 导出工作流定义
   */
  function exportWorkflow(): WorkflowDefinition {
    return {
      id: workflowMeta.value.id,
      name: workflowMeta.value.name,
      description: workflowMeta.value.description,
      nodes: nodes.value,
      edges: edges.value,
      version: '1.0',
      createdAt: new Date().toISOString(),
      updatedAt: new Date().toISOString(),
    }
  }
  
  /**
   * 清空工作流
   */
  function clearWorkflow() {
    nodes.value = []
    edges.value = []
    selectedNodeId.value = null
    selectedEdgeId.value = null
    history.value = []
    historyIndex.value = -1
    workflowMeta.value = {
      name: '未命名工作流',
      description: '',
      id: '',
    }
  }

  // ============== 节点类型查询 ==============
  
  /**
   * 根据类型获取节点元数据
   */
  function getNodeType(type: string): NodeTypeMetadata | undefined {
    return nodeTypes.value.find((t) => t.type === type)
  }
  
  /**
   * 创建节点实例
   */
  function createNodeInstance(
    type: string,
    position: { x: number; y: number }
  ): WorkflowNode | null {
    const nodeType = getNodeType(type)
    if (!nodeType) return null
    
    const nodeId = `${type}_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`
    
    return {
      id: nodeId,
      type: nodeType.type,
      position,
      data: {
        label: nodeType.label,
        type: nodeType.type,
        description: nodeType.description,
        inputs: JSON.parse(JSON.stringify(nodeType.inputs)),
        outputs: JSON.parse(JSON.stringify(nodeType.outputs)),
        config: {},
      },
    }
  }

  return {
    // 状态
    nodeTypes,
    nodes,
    edges,
    selectedNodeId,
    selectedEdgeId,
    workflowMeta,
    
    // 计算属性
    selectedNode,
    selectedEdge,
    canUndo,
    canRedo,
    statistics,
    
    // 节点操作
    addNode,
    removeNode,
    updateNode,
    updateNodeData,
    
    // 边操作
    addEdge,
    removeEdge,
    
    // 选择操作
    selectNode,
    selectEdge,
    clearSelection,
    
    // 历史记录
    saveHistory,
    undo,
    redo,
    
    // 字段映射
    getUpstreamOutputs,
    buildFieldTree,
    generateFieldExpression,
    
    // 工作流操作
    loadWorkflow,
    exportWorkflow,
    clearWorkflow,
    
    // 节点类型
    getNodeType,
    createNodeInstance,
  }
})