"use client"

import type React from "react"
import dynamic from "next/dynamic"

import { SiteHeader } from "@/components/site-header"
import { TreeLayout } from "@/components/tree/tree-layout"
import { useFamily } from "@/context/family-context"
import { useRelationship } from "@/hooks/use-relationship"
import { Button } from "@/components/ui/button"
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu"
import { Dialog, DialogContent, DialogHeader, DialogTitle } from "@/components/ui/dialog"
import { Badge } from "@/components/ui/badge"
import { ZoomIn, ZoomOut, Move, Download, LayoutGrid, ChevronDown, Users, Network, User, Loader2 } from "lucide-react"
import { useState, useRef, useEffect, useCallback } from "react"
import { useRouter, useSearchParams } from "next/navigation"
import { MemberNameWithStatus } from "@/components/member-name-with-status"
import { RelationshipPathDisplay } from "@/components/relationship-path-display"
import { useSession } from "next-auth/react"
import { EmptyStateBadge } from "@/components/empty-state-badge"

// 动态导入 D3 图表组件（减少初始加载体积）
const D3OrgChartFlow = dynamic(
  () => import("@/components/tree/d3-org-chart-flow").then(mod => ({ default: mod.D3OrgChartFlow })),
  { 
    ssr: false,
    loading: () => (
      <div className="w-full h-full flex items-center justify-center">
        <Loader2 className="h-8 w-8 animate-spin text-primary" />
        <span className="ml-2 text-muted-foreground">加载图表组件...</span>
      </div>
    )
  }
)

// 导入类型
import type { D3OrgChartRef } from "@/components/tree/d3-org-chart-flow"

type ViewMode = "traditional" | "d3-org-chart"

export default function TreePage() {
  const { treeData } = useFamily()
  const { calculateRelationship } = useRelationship()
  const { data: session, status } = useSession()
  const router = useRouter()
  const searchParams = useSearchParams()
  const [viewMode, setViewMode] = useState<ViewMode>("traditional")
  
  // 关系查询模式
  const [relationMode, setRelationMode] = useState(false)
  const [selectedMembers, setSelectedMembers] = useState<string[]>([])
  const [relationResult, setRelationResult] = useState<any>(null)
  const [showRelationDialog, setShowRelationDialog] = useState(false)
  
  // 使用ref存储最新的relationMode值，避免回调重新创建
  const relationModeRef = useRef(relationMode)
  const selectedMembersRef = useRef(selectedMembers)
  
  useEffect(() => {
    relationModeRef.current = relationMode
    selectedMembersRef.current = selectedMembers
  }, [relationMode, selectedMembers])
  
  // 未登录时重定向到登录页
  useEffect(() => {
    if (status === 'unauthenticated') {
      router.push('/auth/signin')
    }
  }, [status, router])
  
  // 从 URL 参数读取视图模式
  useEffect(() => {
    const view = searchParams.get('view')
    if (view === 'd3-org-chart' || view === 'traditional') {
      setViewMode(view)
    }
  }, [searchParams])
  const [scale, setScale] = useState(1)
  const [position, setPosition] = useState({ x: 0, y: 0 })
  const [isDragging, setIsDragging] = useState(false)
  const [startPos, setStartPos] = useState({ x: 0, y: 0 })
  const [dragStartPos, setDragStartPos] = useState({ x: 0, y: 0 })
  const containerRef = useRef<HTMLDivElement>(null)
  const d3ChartRef = useRef<D3OrgChartRef>(null)

  const handleMouseDown = (e: React.MouseEvent) => {
    // 如果点击的是节点卡片，不启动拖拽
    const target = e.target as HTMLElement
    if (target.closest('.family-node-card')) {
      return
    }
    
    setIsDragging(true)
    setStartPos({ x: e.clientX - position.x, y: e.clientY - position.y })
    setDragStartPos({ x: e.clientX, y: e.clientY })
  }

  const handleMouseMove = (e: React.MouseEvent) => {
    if (!isDragging) return
    
    // 只有移动超过5px才算拖拽，避免误触
    const deltaX = Math.abs(e.clientX - dragStartPos.x)
    const deltaY = Math.abs(e.clientY - dragStartPos.y)
    if (deltaX < 5 && deltaY < 5) return
    
    setPosition({
      x: e.clientX - startPos.x,
      y: e.clientY - startPos.y,
    })
  }

  const handleMouseUp = () => {
    setIsDragging(false)
  }

  // 鼠标滚轮缩放
  const handleWheel = (e: React.WheelEvent) => {
    e.preventDefault()
    const delta = e.deltaY > 0 ? -0.1 : 0.1
    setScale((s) => Math.min(Math.max(s + delta, 0.1), 2))
  }

  // 处理成员选择（关系查询模式）
  const handleMemberClick = (memberId: string) => {
    if (selectedMembers.length === 0) {
      // 选择第一个成员
      setSelectedMembers([memberId])
    } else if (selectedMembers.length === 1) {
      // 选择第二个成员，计算关系
      const [firstId] = selectedMembers
      if (firstId === memberId) {
        // 点击同一个人，取消选择
        setSelectedMembers([])
        return
      }
      
      const result = calculateRelationship(firstId, memberId)
      const firstMember = treeData.members[firstId]
      const secondMember = treeData.members[memberId]
      
      setRelationResult({
        from: firstMember,
        to: secondMember,
        relationship: result
      })
      setShowRelationDialog(true)
      setSelectedMembers([])
      setRelationMode(false)
    }
  }
  
  // 切换关系查询模式
  const toggleRelationMode = () => {
    setRelationMode(!relationMode)
    setSelectedMembers([])
    setRelationResult(null)
  }
  
  // 处理对话框关闭
  const handleDialogClose = (open: boolean) => {
    setShowRelationDialog(open)
    if (!open && relationResult) {
      // 清除选中样式
      const clearNodeStyle = (nodeId: string) => {
        const chartContainer = document.querySelector('.w-full.h-full.bg-background.rounded-lg.border')
        const svg = chartContainer?.querySelector('svg')
        if (!svg) return
        
        const foreignObjects = svg.querySelectorAll('foreignObject')
        foreignObjects.forEach((fo: any) => {
          const nodeData = (fo.parentNode as any)?.__data__?.data
          if (nodeData?.id === nodeId) {
            const nameDiv = fo.querySelector('div[style*="font-size: 13px"]') as HTMLElement
            if (nameDiv) {
              // 移除勾选图标
              const checkIcon = nameDiv.querySelector('svg')
              if (checkIcon) {
                checkIcon.remove()
              }
            }
          }
        })
      }
      
      clearNodeStyle(relationResult.from.id)
      clearNodeStyle(relationResult.to.id)
    }
  }
  
  // 使用useCallback创建稳定的回调，通过ref访问最新的relationMode
  const handleD3MemberClick = useCallback((id: string) => {
    console.log('D3 onMemberClick triggered:', id, 'relationMode:', relationModeRef.current)
    if (relationModeRef.current) {
      console.log('Calling handleMemberClick')
      
      // 更新节点样式的辅助函数
      const updateNodeStyle = (nodeId: string, isSelected: boolean) => {
        // 从DOM中查找D3图表容器
        const chartContainer = document.querySelector('.w-full.h-full.bg-background.rounded-lg.border')
        const svg = chartContainer?.querySelector('svg')
        if (!svg) return
        
        const foreignObjects = svg.querySelectorAll('foreignObject')
        foreignObjects.forEach((fo: any) => {
          const nodeData = (fo.parentNode as any)?.__data__?.data
          if (nodeData?.id === nodeId) {
            const nameDiv = fo.querySelector('div[style*="font-size: 13px"]') as HTMLElement
            if (nameDiv) {
              if (isSelected) {
                // 添加勾选图标
                if (!nameDiv.querySelector('svg')) {
                  const iconHTML = `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="#3b82f6" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" style="margin-left: 4px"><polyline points="20 6 9 17 4 12"/></svg>`
                  nameDiv.style.display = 'flex'
                  nameDiv.style.alignItems = 'center'
                  nameDiv.insertAdjacentHTML('beforeend', iconHTML)
                }
              } else {
                // 移除勾选图标
                const checkIcon = nameDiv.querySelector('svg')
                if (checkIcon) {
                  checkIcon.remove()
                }
              }
            }
          }
        })
      }
      
      // 直接处理选择逻辑
      if (selectedMembersRef.current.length === 0) {
        updateNodeStyle(id, true)
        setSelectedMembers([id])
      } else if (selectedMembersRef.current.length === 1) {
        const [firstId] = selectedMembersRef.current
        if (firstId === id) {
          updateNodeStyle(id, false)
          setSelectedMembers([])
          return
        }
        
        updateNodeStyle(id, true)
        
        const result = calculateRelationship(firstId, id)
        const firstMember = treeData.members[firstId]
        const secondMember = treeData.members[id]
        
        setRelationResult({
          from: firstMember,
          to: secondMember,
          relationship: result
        })
        setShowRelationDialog(true)
        setSelectedMembers([])
        setRelationMode(false)
        // 选中样式会在对话框关闭时清除
      }
    } else {
      console.log('Navigating to member detail')
      const params = new URLSearchParams(window.location.search)
      router.push(`/members/${id}?${params.toString()}`)
    }
  }, [router, calculateRelationship, treeData.members])

  const handleExportImage = async () => {
    if (!containerRef.current) return

    try {
      // 临时重置位置和缩放以获取完整视图
      const originalPosition = { ...position }
      const originalScale = scale
      setPosition({ x: 0, y: 0 })
      setScale(1)

      // 等待 DOM 更新
      await new Promise(resolve => setTimeout(resolve, 800))

      // 找到实际的族谱容器（包含 TreeLayout 的 div）
      const treeContainer = containerRef.current.querySelector('div[style*="transform"]') as HTMLElement
      if (!treeContainer) {
        throw new Error('找不到族谱容器')
      }

      // 查找所有连接线（使用更宽泛的选择器）
      const allDivs = treeContainer.querySelectorAll('div')
      const lineElements: HTMLElement[] = []
      
      allDivs.forEach(div => {
        const el = div as HTMLElement
        const classes = String(el.className || '')
        // 查找包含 bg-foreground 的元素（连接线）
        if (classes.includes('bg-foreground')) {
          lineElements.push(el)
        }
      })
      
      // 克隆容器用于导出
      const clonedContainer = treeContainer.cloneNode(true) as HTMLElement
      
      // 在克隆的容器中找到对应的连接线并设置样式
      const clonedDivs = clonedContainer.querySelectorAll('div')
      let lineIndex = 0
      clonedDivs.forEach(div => {
        const el = div as HTMLElement
        const classes = String(el.className || '')
        if (classes.includes('bg-foreground') && lineElements[lineIndex]) {
          const original = lineElements[lineIndex]
          const computed = window.getComputedStyle(original)
          
          // 直接设置内联样式
          el.style.backgroundColor = computed.backgroundColor
          el.style.width = computed.width
          el.style.height = computed.height
          el.style.position = 'absolute'
          el.style.left = computed.left
          el.style.top = computed.top
          
          lineIndex++
        }
      })
      
      // 移除卡片边框
      clonedContainer.querySelectorAll('*').forEach((child) => {
        const el = child as HTMLElement
        const classes = String(el.className || '')
        
        // 跳过连接线和连接线容器
        if (classes.includes('bg-foreground') || classes.includes('pointer-events-none')) {
          return
        }
        
        // 移除其他元素的边框
        el.style.border = 'none'
        el.style.outline = 'none'
      })
      
      // 临时添加到 DOM
      clonedContainer.style.position = 'fixed'
      clonedContainer.style.left = '-9999px'
      clonedContainer.style.top = '0'
      document.body.appendChild(clonedContainer)
      
      // 等待渲染
      await new Promise(resolve => setTimeout(resolve, 200))

      // 动态导入 dom-to-image-more（仅在客户端）
      const domtoimage = await import('dom-to-image-more')
      
      // 使用 toBlob 方法
      const blob = await domtoimage.default.toBlob(clonedContainer, {
        quality: 0.95,
        bgcolor: '#ffffff'
      })
      
      // 清理克隆的容器
      document.body.removeChild(clonedContainer)

      // 恢复原始位置和缩放
      setPosition(originalPosition)
      setScale(originalScale)

      // 创建下载链接
      const url = URL.createObjectURL(blob)
      const link = document.createElement('a')
      link.download = `family-tree-${new Date().toISOString().split('T')[0]}.png`
      link.href = url
      link.click()
      
      // 清理
      setTimeout(() => URL.revokeObjectURL(url), 100)
    } catch (error) {
      console.error('导出图片失败:', error)
    }
  }

  // 未登录时不渲染内容（已在 useEffect 中重定向）
  if (status === 'loading' || !session) {
    return null
  }

  // Handle root not found
  if (!treeData.rootId) {
    return (
      <div className="min-h-screen bg-background flex flex-col">
        <SiteHeader />
        <div className="flex-1 flex items-center justify-center">
          <div className="text-center space-y-4">
            <div className="inline-flex items-center justify-center w-16 h-16 text-primary/80">
              <Network className="h-16 w-16" strokeWidth={1} />
            </div>
            <p className="text-base text-foreground font-light tracking-wide">谱系待续</p>
          </div>
        </div>
      </div>
    )
  }

  return (
    <div className="h-screen flex flex-col bg-muted/30 overflow-hidden">
      <SiteHeader />

      {/* 视图切换和关系查询按钮 */}
      <div className="absolute top-20 right-4 z-30 flex gap-2">
        {/* 关系查询按钮 */}
        <Button 
          variant={relationMode ? "default" : "outline"} 
          className="gap-2 shadow-lg"
          onClick={toggleRelationMode}
        >
          <Users className="h-4 w-4" />
          {relationMode ? (
            selectedMembers.length === 0 ? '选择第一个成员' : '选择第二个成员'
          ) : '关系查询'}
        </Button>
        
        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button variant="outline" className="gap-2 shadow-lg">
              <LayoutGrid className="h-4 w-4" />
              {viewMode === 'traditional' ? '传统视图' : 'D3家谱图'}
              <ChevronDown className="h-3 w-3" />
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end" className="w-48">
            <DropdownMenuItem 
              onClick={() => {
                const params = new URLSearchParams(searchParams.toString())
                params.set('view', 'traditional')
                router.push(`/tree?${params.toString()}`)
              }}
              className={viewMode === 'traditional' ? 'bg-accent' : ''}
            >
              <div className="flex items-center justify-between w-full">
                <span>传统家谱视图</span>
                {viewMode === 'traditional' && <span className="text-primary">✓</span>}
              </div>
            </DropdownMenuItem>
            <DropdownMenuItem 
              onClick={() => {
                const params = new URLSearchParams(searchParams.toString())
                params.set('view', 'd3-org-chart')
                router.push(`/tree?${params.toString()}`)
              }}
              className={viewMode === 'd3-org-chart' ? 'bg-accent' : ''}
            >
              <div className="flex items-center justify-between w-full">
                <span>D3 家谱图</span>
                {viewMode === 'd3-org-chart' && <span className="text-primary">✓</span>}
              </div>
            </DropdownMenuItem>
          </DropdownMenuContent>
        </DropdownMenu>
      </div>

      {viewMode === 'traditional' ? (
        <div className="flex-1 relative min-h-0">
          {/* Toolbar */}
          <div className="absolute top-4 left-4 z-20 flex flex-col gap-2 bg-background/80 backdrop-blur p-2 rounded-lg border shadow-sm">
            <Button variant="outline" size="icon" onClick={() => setScale((s) => Math.min(s + 0.1, 2))}>
              <ZoomIn className="h-4 w-4" />
            </Button>
            <Button variant="outline" size="icon" onClick={() => setScale((s) => Math.max(s - 0.1, 0.1))}>
              <ZoomOut className="h-4 w-4" />
            </Button>
            <Button variant="outline" size="icon" onClick={() => setPosition({ x: 0, y: 0 })}>
              <Move className="h-4 w-4" />
            </Button>
            <div className="h-px bg-border my-1" />
            <Button variant="outline" size="icon" onClick={handleExportImage} title="导出为图片">
              <Download className="h-4 w-4" />
            </Button>
          </div>

          {/* Tree Canvas */}
          <div
            ref={containerRef}
            className="w-full h-full overflow-hidden cursor-move relative touch-none bg-[url('https://www.transparenttextures.com/patterns/rice-paper.png')] bg-repeat select-none"
            onMouseDown={handleMouseDown}
            onMouseMove={handleMouseMove}
            onMouseUp={handleMouseUp}
            onMouseLeave={handleMouseUp}
            onWheel={handleWheel}
          >
            <div
              style={{
                transform: `translate(${position.x}px, ${position.y}px) scale(${scale})`,
                transformOrigin: "top center",
                transition: isDragging ? "none" : "transform 0.1s ease-out",
              }}
              className="absolute min-w-full min-h-full flex justify-center pt-20 pb-20"
            >
              <TreeLayout 
                rootId={treeData.rootId}
                relationMode={relationMode}
                selectedMembers={selectedMembers}
                onMemberClick={handleMemberClick}
              />
            </div>
          </div>
        </div>
      ) : (
        <div className="flex-1 relative min-h-0">
          {/* 统一的控制按钮 */}
          <div className="absolute top-4 left-4 z-20 flex flex-col gap-2 bg-background/80 backdrop-blur p-2 rounded-lg border shadow-sm">
            <Button variant="outline" size="icon" onClick={() => d3ChartRef.current?.expandAll()} title="展开全部">
              <ZoomIn className="h-4 w-4" />
            </Button>
            <Button variant="outline" size="icon" onClick={() => d3ChartRef.current?.collapseAll()} title="折叠全部">
              <ZoomOut className="h-4 w-4" />
            </Button>
            <Button variant="outline" size="icon" onClick={() => d3ChartRef.current?.fitView()} title="适应视图">
              <Move className="h-4 w-4" />
            </Button>
            <div className="h-px bg-border my-1" />
            <Button variant="outline" size="icon" onClick={() => d3ChartRef.current?.exportPNG()} title="导出PNG">
              <Download className="h-4 w-4" />
            </Button>
          </div>
          
          <div className="w-full h-full p-4">
            <D3OrgChartFlow
              ref={d3ChartRef}
              members={treeData.members}
              rootId={treeData.rootId}
              relationMode={relationMode}
              selectedMembers={selectedMembers}
              onMemberClick={handleD3MemberClick}
            />
          </div>
        </div>
      )}
      
      {/* 关系查询结果对话框 */}
      <Dialog open={showRelationDialog} onOpenChange={handleDialogClose}>
        <DialogContent className="max-w-2xl" aria-describedby="relation-description">
          <DialogHeader>
            <DialogTitle>关系查询结果</DialogTitle>
          </DialogHeader>
          
          {relationResult && (
            <div className="space-y-4">
              {/* 成员信息 */}
              <div className="flex items-center justify-center gap-4 p-6 bg-muted rounded-lg">
                <div className="text-center">
                  <div className="text-2xl font-bold font-serif mb-1">
                    <MemberNameWithStatus 
                      name={relationResult.from.fullName}
                      isDead={!!relationResult.from.deathDate}
                    />
                  </div>
                  <div className="text-sm text-muted-foreground">
                    第{relationResult.from.generation}世
                  </div>
                </div>

                <div className="flex flex-col items-center gap-2">
                  <Badge variant="default" className="text-lg px-4 py-2">
                    {relationResult.relationship.term}
                  </Badge>
                </div>

                <div className="text-center">
                  <div className="text-2xl font-bold font-serif mb-1">
                    <MemberNameWithStatus 
                      name={relationResult.to.fullName}
                      isDead={!!relationResult.to.deathDate}
                    />
                  </div>
                  <div className="text-sm text-muted-foreground">
                    第{relationResult.to.generation}世
                  </div>
                </div>
              </div>

              {/* 关系说明 */}
              <div id="relation-description" className="p-4 bg-blue-50 dark:bg-blue-950 rounded-lg">
                <div className="text-sm font-medium mb-1">关系说明：</div>
                <div className="text-muted-foreground">
                  <strong><MemberNameWithStatus name={relationResult.from.fullName} isDead={!!relationResult.from.deathDate} /></strong> 是 <strong><MemberNameWithStatus name={relationResult.to.fullName} isDead={!!relationResult.to.deathDate} /></strong> 的 <strong className="text-primary">{relationResult.relationship.term}</strong>
                </div>
              </div>

              {/* 关系路径 */}
              {relationResult.relationship.path && (
                <div className="p-4 bg-muted rounded-lg">
                  <div className="text-sm font-medium mb-2">关系路径：</div>
                  <RelationshipPathDisplay 
                    path={relationResult.relationship.path}
                    className="text-xs"
                  />
                </div>
              )}
            </div>
          )}
        </DialogContent>
      </Dialog>
    </div>
  )
}