"use client"

import { useState, useMemo, useEffect, useCallback, memo } from "react"
import { SiteHeader } from "@/components/site-header"
import { useFamily } from "@/context/family-context"
import { useRouter } from "next/navigation"
import { Input } from "@/components/ui/input"
import { Button } from "@/components/ui/button"
import { Card, CardContent } from "@/components/ui/card"
import { Search, Plus, Filter, X, Users, User } from "lucide-react"
import Link from "next/link"
import { AvatarDisplay } from "@/components/ui/avatar-display"
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@/components/ui/select"
import { Slider } from "@/components/ui/slider"
import { Label } from "@/components/ui/label"
import { Badge } from "@/components/ui/badge"
import { Popover, PopoverContent, PopoverTrigger } from "@/components/ui/popover"
import type { FamilyMember } from "@/types/family"
import { permissions } from "@/lib/permissions"
import { MemberNameWithStatus } from "@/components/member-name-with-status"
import { useSession } from "next-auth/react"
import { EmptyStateBadge } from "@/components/empty-state-badge"

// 占位符类型
interface PlaceholderMember {
  id: string
  isPlaceholder: true
}

type MemberOrPlaceholder = FamilyMember | PlaceholderMember

// 提取占位符生成逻辑为独立函数
function addPlaceholdersToFamilyUnit(
  member: FamilyMember,
  spouses: FamilyMember[],
  processedSpouses: Set<string>
): MemberOrPlaceholder[] {
  const result: MemberOrPlaceholder[] = [member]
  let familyUnitSize = 1 // 主成员自己
  
  // 添加配偶
  if (member.spouseIds && member.spouseIds.length > 0) {
    member.spouseIds.forEach(spouseId => {
      const spouse = spouses.find(m => m.id === spouseId)
      if (spouse && !processedSpouses.has(spouseId)) {
        result.push(spouse)
        processedSpouses.add(spouseId)
        familyUnitSize++
      }
    })
  }
  
  // 计算需要添加的占位符数量，确保填满4的倍数
  const placeholdersNeeded = (4 - (familyUnitSize % 4)) % 4
  for (let i = 0; i < placeholdersNeeded; i++) {
    result.push({ id: `placeholder-${member.id}-${i}`, isPlaceholder: true })
  }
  
  return result
}

// 判断是否是占位符
function isPlaceholder(member: MemberOrPlaceholder): member is PlaceholderMember {
  return 'isPlaceholder' in member && member.isPlaceholder === true
}

// 成员卡片组件 - 使用 memo 优化
const MemberCard = memo(function MemberCard({
  member,
  allMembers,
  onLocateInTree,
}: {
  member: FamilyMember
  allMembers: FamilyMember[]
  onLocateInTree: (id: string) => void
}) {
  // 判断是否是配偶
  const isFounder = member.isFounder === true
  const isSpouse = !member.fatherId && !member.motherId && 
                   member.spouseIds && member.spouseIds.length > 0 && 
                   !isFounder
  
  // 获取配偶信息
  const spouse = isSpouse && member.spouseIds?.[0] 
    ? allMembers.find(m => m.id === member.spouseIds[0]) 
    : null
  const spouseName = spouse ? spouse.fullName : null
  
  // 获取父母信息
  const father = member.fatherId ? allMembers.find(m => m.id === member.fatherId) : null
  const mother = member.motherId ? allMembers.find(m => m.id === member.motherId) : null
  
  return (
    <div className="relative group">
      <Link href={`/members/${member.id}${typeof window !== 'undefined' ? window.location.search : ''}`}>
        <Card className={`hover:border-primary transition-colors cursor-pointer h-full ${
          isSpouse 
            ? 'bg-pink-50/50 dark:bg-pink-950/20 border-pink-200/50 dark:border-pink-800/30' 
            : 'bg-blue-50/50 dark:bg-blue-950/20 border-blue-200/50 dark:border-blue-800/30'
        }`}>
          <CardContent className="px-3 py-2 flex items-center gap-5">
            <div className="relative flex-shrink-0">
              <AvatarDisplay
                imageUrl={member.avatarUrl}
                fallbackText={member.surname}
                gender={member.gender}
                className="h-20 w-20 border-2 border-border"
              />
            </div>
            <div className="flex-1 min-w-0 flex flex-col justify-center">
              <div className="flex items-baseline justify-between gap-1.5">
                <h3 className="text-lg font-bold font-serif truncate flex items-center gap-1">
                  {isFounder && <span className="text-amber-600">👑</span>}
                  <MemberNameWithStatus 
                    name={member.fullName}
                    isDead={!!member.deathDate}
                    dotPosition="top-left"
                  />
                  {member.courtesyName && (
                    <span className="text-xs font-normal text-muted-foreground ml-1">
                      字 {member.courtesyName}
                    </span>
                  )}
                </h3>
                {/* 父母信息 - 放在姓名右侧 */}
                {(father || mother) && (
                  <div className="flex items-center gap-1 text-xs text-muted-foreground flex-shrink-0">
                    <span className="text-muted-foreground/70">父母:</span>
                    {father && (
                      <span 
                        className="hover:text-primary hover:underline cursor-pointer"
                        onClick={(e) => {
                          e.preventDefault()
                          e.stopPropagation()
                          window.location.href = `/members/${father.id}${window.location.search}`
                        }}
                      >
                        <MemberNameWithStatus 
                          name={father.fullName}
                          isDead={!!father.deathDate}
                          dotPosition="top-left"
                        />
                      </span>
                    )}
                    {father && mother && <span className="text-muted-foreground/50">·</span>}
                    {mother && (
                      <span 
                        className="hover:text-primary hover:underline cursor-pointer"
                        onClick={(e) => {
                          e.preventDefault()
                          e.stopPropagation()
                          window.location.href = `/members/${mother.id}${window.location.search}`
                        }}
                      >
                        <MemberNameWithStatus 
                          name={mother.fullName}
                          isDead={!!mother.deathDate}
                          dotPosition="top-left"
                        />
                      </span>
                    )}
                  </div>
                )}
              </div>
              {isFounder ? (
                <p className="text-xs text-amber-700 font-semibold mt-0.5 truncate">
                  家族始祖
                </p>
              ) : isSpouse && spouseName ? (
                <p className="text-xs text-purple-700 mt-0.5 truncate">
                  {spouseName}的配偶
                </p>
              ) : (
                <p className="text-xs text-muted-foreground mt-0.5 truncate">
                  {member.generationName ? `字辈: ${member.generationName}` : "未录入字辈"}
                </p>
              )}
              
              {/* 籍贯和生卒年并排 */}
              <div className="flex items-start justify-between gap-2 mt-0.5">
                <p className="text-xs text-muted-foreground truncate flex-1">{member.ancestralHome || "籍贯未知"}</p>
                
                {/* 生卒年和年龄 */}
                {(member.birthDate || member.deathDate) && (
                  <div className="text-xs text-muted-foreground text-right space-y-0.5 flex-shrink-0">
                    <div className="flex items-center gap-1 justify-end">
                      <span>
                        {member.birthDate && new Date(member.birthDate).getFullYear()}
                        {member.deathDate && ` - ${new Date(member.deathDate).getFullYear()}`}
                        {!member.deathDate && member.birthDate && ' - '}
                      </span>
                      {member.isLunarDate && (
                        <span className="text-[10px] text-amber-600 bg-amber-50 px-1 py-0.5 rounded border border-amber-200">
                          农历
                        </span>
                      )}
                    </div>
                    {(() => {
                      if (!member.birthDate) return null
                      const birthYear = new Date(member.birthDate).getFullYear()
                      const deathYear = member.deathDate ? new Date(member.deathDate).getFullYear() : new Date().getFullYear()
                      const age = deathYear - birthYear
                      return (
                        <div className="text-[10px] text-muted-foreground">
                          {member.deathDate ? `享年${age}岁` : `${age}岁`}
                        </div>
                      )
                    })()}
                  </div>
                )}
              </div>
              
              {member.tags && member.tags.length > 0 && (
                <div className="mt-1.5 flex flex-wrap gap-1">
                  {member.tags.map((tag) => (
                    <span
                      key={tag}
                      className={tag === '始祖' 
                        ? "text-xs bg-amber-100 text-amber-800 px-2 py-0.5 rounded border border-amber-300 font-semibold" 
                        : "text-xs bg-primary/10 text-primary px-2 py-0.5 rounded border border-primary/20"}
                    >
                      {tag === '始祖' ? '👑 始祖' : tag}
                    </span>
                  ))}
                </div>
              )}
            </div>
          </CardContent>
        </Card>
      </Link>
      <Button
        size="sm"
        variant="ghost"
        className="absolute top-2 right-2 opacity-0 group-hover:opacity-100 transition-opacity h-6 w-6 p-0"
        onClick={() => onLocateInTree(member.id)}
        title="在族谱图中定位"
      >
        <Search className="h-3 w-3" />
      </Button>
    </div>
  )
})

export default function MembersPage() {
  const { treeData, currentTree, searchMembers, setHighlightedMemberId } = useFamily()
  const { data: session, status } = useSession()
  const router = useRouter()
  const [query, setQuery] = useState("")
  const [showFilters, setShowFilters] = useState(false)
  
  // 未登录时重定向到登录页
  useEffect(() => {
    if (status === 'unauthenticated') {
      router.push('/auth/signin')
    }
  }, [status, router])
  
  // 从 URL 参数读取搜索关键词
  useEffect(() => {
    const params = new URLSearchParams(window.location.search)
    const searchParam = params.get('search')
    if (searchParam) {
      setQuery(searchParam)
    }
  }, [])

  // Filter States
  const [selectedSurname, setSelectedSurname] = useState<string>("all")
  const [selectedHome, setSelectedHome] = useState<string>("all")
  const [statusFilter, setStatusFilter] = useState<string>("all")
  const [generationRange, setGenerationRange] = useState<[number, number]>([1, 100])

  // Derived Data
  const allMembers = useMemo(() => Object.values(treeData.members), [treeData])

  const { uniqueSurnames, uniqueHomes, minGen, maxGen } = useMemo(() => {
    const surnames = new Set<string>()
    const homes = new Set<string>()
    let min = 1000
    let max = 0

    allMembers.forEach((m) => {
      if (m.surname) surnames.add(m.surname)
      if (m.ancestralHome) homes.add(m.ancestralHome)
      if (m.generation) {
        if (m.generation < min) min = m.generation
        if (m.generation > max) max = m.generation
      }
    })

    return {
      uniqueSurnames: Array.from(surnames).sort(),
      uniqueHomes: Array.from(homes).sort(),
      minGen: min === 1000 ? 1 : min,
      maxGen: max === 0 ? 100 : max,
    }
  }, [allMembers])

  // Initialize slider when data loads - 修复：使用 useEffect 而不是 useMemo
  useEffect(() => {
    if (minGen !== 1000 && maxGen !== 0) {
      // 只在初始加载时设置一次
      setGenerationRange([minGen, maxGen])
    }
  }, [minGen, maxGen])

  const filteredMembers = useMemo(() => {
    let result = allMembers

    // 1. Search Query
    if (query) {
      const lowerQuery = query.toLowerCase()
      result = result.filter(
        (m) =>
          m.fullName.toLowerCase().includes(lowerQuery) ||
          m.courtesyName?.toLowerCase().includes(lowerQuery) ||
          m.artName?.toLowerCase().includes(lowerQuery),
      )
    }

    // 2. Surname Filter
    if (selectedSurname !== "all") {
      result = result.filter((m) => m.surname === selectedSurname)
    }

    // 3. Home Filter
    if (selectedHome !== "all") {
      result = result.filter((m) => m.ancestralHome === selectedHome)
    }

    // 4. Status Filter
    if (statusFilter !== "all") {
      if (statusFilter === "living") {
        result = result.filter((m) => !m.deathDate)
      } else if (statusFilter === "deceased") {
        result = result.filter((m) => !!m.deathDate)
      }
    }

    // 5. Generation Filter
    result = result.filter((m) => m.generation >= generationRange[0] && m.generation <= generationRange[1])

    // Sort
    return result.sort((a, b) => a.generation - b.generation || (a.birthDate || "").localeCompare(b.birthDate || ""))
  }, [allMembers, query, selectedSurname, selectedHome, statusFilter, generationRange])
  
  // 按世代分组并排序 - 优化后的版本
  const membersByGeneration = useMemo(() => {
    const groups = new Map<number, FamilyMember[]>()
    
    // 第一步：按世代分组
    filteredMembers.forEach(member => {
      const gen = member.generation
      if (!groups.has(gen)) {
        groups.set(gen, [])
      }
      groups.get(gen)!.push(member)
    })
    
    // 第二步：转换为数组并排序
    return Array.from(groups.entries())
      .sort((a, b) => a[0] - b[0])
      .map(([generation, members]) => {
        // 区分家族成员和配偶
        const familyMembers = members.filter(m => {
          const isFounder = m.isFounder === true
          const hasFamilyParents = m.fatherId || m.motherId
          
          if (hasFamilyParents || isFounder) return true
          if (generation === 1 && (!m.spouseIds || m.spouseIds.length === 0)) return true
          
          return false
        })
        
        // 对家族成员按年龄排序
        const sortedFamilyMembers = familyMembers.sort((a, b) => {
          const aIsFounder = a.isFounder === true
          const bIsFounder = b.isFounder === true
          if (aIsFounder && !bIsFounder) return -1
          if (!aIsFounder && bIsFounder) return 1
          
          const aDate = a.birthDate || "9999-12-31"
          const bDate = b.birthDate || "9999-12-31"
          return aDate.localeCompare(bDate)
        })
        
        // 使用优化后的函数添加配偶和占位符
        const result: MemberOrPlaceholder[] = []
        const processedSpouses = new Set<string>()
        
        sortedFamilyMembers.forEach(member => {
          const familyUnit = addPlaceholdersToFamilyUnit(member, members, processedSpouses)
          result.push(...familyUnit)
        })
        
        // 计算实际成员数（不包括占位符）
        const actualMemberCount = result.filter(m => !isPlaceholder(m)).length
        
        return {
          generation,
          members: result,
          actualCount: actualMemberCount
        }
      })
  }, [filteredMembers])

  const clearFilters = () => {
    setSelectedSurname("all")
    setSelectedHome("all")
    setStatusFilter("all")
    setGenerationRange([1, 100]) // Reset to wide range
    setQuery("")
  }

  const activeFilterCount =
    (selectedSurname !== "all" ? 1 : 0) +
    (selectedHome !== "all" ? 1 : 0) +
    (statusFilter !== "all" ? 1 : 0) +
    (generationRange[0] > 1 || generationRange[1] < 100 ? 1 : 0)

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

  return (
    <div className="h-screen bg-background flex flex-col font-sans overflow-hidden">
      <SiteHeader />
      <main className="container mx-auto py-8 px-4 md:px-6 flex-1 flex flex-col overflow-hidden">
        <div className="flex flex-col gap-6 mb-8 flex-shrink-0">
          <div className="flex flex-col md:flex-row justify-between items-center gap-4">
            <h1 className="text-3xl font-serif font-bold">家族成员列表</h1>
            <div className="flex items-center gap-2 w-full md:w-auto">
              <div className="relative flex-1 md:w-80">
                <Search className="absolute left-2.5 top-2.5 h-4 w-4 text-muted-foreground" />
                <Input
                  type="search"
                  placeholder="搜索姓名、字号..."
                  className="pl-9"
                  value={query}
                  onChange={(e) => setQuery(e.target.value)}
                />
              </div>
              <Button
                variant={showFilters || activeFilterCount > 0 ? "secondary" : "outline"}
                size="icon"
                onClick={() => setShowFilters(!showFilters)}
                className="relative"
              >
                <Filter className="h-4 w-4" />
                {activeFilterCount > 0 && (
                  <span className="absolute -top-1 -right-1 h-3 w-3 rounded-full bg-primary border-2 border-background" />
                )}
              </Button>
              {permissions.canCreate(currentTree?.currentUserRole) && (
                <Link href={`/members/new${typeof window !== 'undefined' ? window.location.search : ''}`}>
                  <Button className="gap-2 bg-primary text-primary-foreground">
                    <Plus className="h-4 w-4" />
                    新增成员
                  </Button>
                </Link>
              )}
            </div>
          </div>

          {/* Filter Bar */}
          {showFilters && (
            <div className="bg-muted/30 p-4 rounded-lg border border-border space-y-4 animate-in slide-in-from-top-2">
              <div className="flex items-center justify-between">
                <h3 className="font-medium text-sm text-muted-foreground">高级筛选</h3>
                <Button variant="ghost" size="sm" onClick={clearFilters} className="h-8 text-xs">
                  <X className="mr-1 h-3 w-3" /> 重置筛选
                </Button>
              </div>
              <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
                <div className="space-y-2">
                  <Label className="text-xs">姓氏</Label>
                  <Select value={selectedSurname} onValueChange={setSelectedSurname}>
                    <SelectTrigger>
                      <SelectValue placeholder="全部" />
                    </SelectTrigger>
                    <SelectContent>
                      <SelectItem value="all">全部</SelectItem>
                      {uniqueSurnames.map((s) => (
                        <SelectItem key={s} value={s}>
                          {s}
                        </SelectItem>
                      ))}
                    </SelectContent>
                  </Select>
                </div>

                <div className="space-y-2">
                  <Label className="text-xs">籍贯</Label>
                  <Select value={selectedHome} onValueChange={setSelectedHome}>
                    <SelectTrigger>
                      <SelectValue placeholder="全部" />
                    </SelectTrigger>
                    <SelectContent>
                      <SelectItem value="all">全部</SelectItem>
                      {uniqueHomes.map((h) => (
                        <SelectItem key={h} value={h}>
                          {h}
                        </SelectItem>
                      ))}
                    </SelectContent>
                  </Select>
                </div>

                <div className="space-y-2">
                  <Label className="text-xs">状态</Label>
                  <Select value={statusFilter} onValueChange={setStatusFilter}>
                    <SelectTrigger>
                      <SelectValue placeholder="全部" />
                    </SelectTrigger>
                    <SelectContent>
                      <SelectItem value="all">全部</SelectItem>
                      <SelectItem value="living">在世</SelectItem>
                      <SelectItem value="deceased">已故</SelectItem>
                    </SelectContent>
                  </Select>
                </div>

                <div className="space-y-2">
                  <div className="flex justify-between">
                    <Label className="text-xs">世系范围</Label>
                    <span className="text-xs text-muted-foreground">
                      {generationRange[0]} - {generationRange[1]} 世
                    </span>
                  </div>
                  <Slider
                    defaultValue={[1, 100]}
                    value={generationRange}
                    min={1}
                    max={100} // Can be dynamic based on maxGen
                    step={1}
                    onValueChange={(val) => setGenerationRange(val as [number, number])}
                    className="py-4"
                  />
                </div>
              </div>
            </div>
          )}
        </div>

        {filteredMembers.length === 0 ? (
          <div className="flex-1 flex items-center justify-center -mt-20">
            <div className="text-center space-y-4">
              <div className="inline-flex items-center justify-center w-16 h-16 text-primary/80">
                <Search className="h-16 w-16" strokeWidth={1} />
              </div>
              <p className="text-base text-foreground font-light tracking-wide">未寻得</p>
            </div>
          </div>
        ) : (
          <div className="space-y-8 overflow-y-auto flex-1 pb-8">
            {membersByGeneration.map(({ generation, members, actualCount }) => (
              <div key={generation}>
                <div className="flex items-center gap-3 mb-4">
                  <h2 className="text-xl font-serif font-bold text-foreground">第 {generation} 世</h2>
                  <span className="text-sm text-muted-foreground">共 {actualCount} 人</span>
                  <div className="flex-1 h-px bg-border"></div>
                </div>
                <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4">
                  {members.map((member) => {
                    // 检查是否是占位符
                    if (isPlaceholder(member)) {
                      return <div key={member.id} className="invisible"></div>
                    }
                    
                    // 使用优化后的 MemberCard 组件
                    return (
                      <MemberCard
                        key={member.id}
                        member={member}
                        allMembers={allMembers}
                        onLocateInTree={(id) => {
                          setHighlightedMemberId(id)
                          const params = new URLSearchParams(window.location.search)
                          router.push(`/tree?${params.toString()}`)
                        }}
                      />
                    )
                  })}
                </div>
              </div>
            ))}
          </div>
        )}
      </main>
    </div>
  )
}