"use client"

import {useEffect, useState} from "react"
import {Button} from "@/components/ui/button"
import {Switch} from "@/components/ui/switch"
import {Separator} from "@/components/ui/separator"
import {Table, TableBody, TableCell, TableHead, TableHeader, TableRow} from "@/components/ui/table"
import {Sheet, SheetContent, SheetTitle} from "@/components/ui/sheet"
import {Badge} from "@/components/ui/badge"
import {Avatar, AvatarFallback, AvatarImage} from "@/components/ui/avatar"
import {
  ChevronDown,
  ChevronLeft,
  ChevronRight,
  Eye,
  Filter,
  Globe,
  Layers,
  Loader2,
  Mail,
  MapPin,
  Plus,
  Search,
  ShieldCheck,
  Smartphone,
  Trash2,
  UserCheck,
  UserX,
  VenusAndMars,
  X
} from "lucide-react"
import {Tooltip, TooltipContent, TooltipProvider, TooltipTrigger} from "@/components/ui/tooltip"
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle
} from "@/components/ui/alert-dialog"

import {AdminUser} from "@/lib/services"
import {cn, formatDateTime} from "@/lib/utils"
import {EmptyStateWithBorder} from "@/components/layout/empty"
import {LoadingStateWithBorder} from "@/components/layout/loading"
import {ErrorInline} from "@/components/layout/error"
import {DropdownMenu, DropdownMenuContent, DropdownMenuItem, DropdownMenuTrigger} from "@/components/ui/dropdown-menu"
import {useAdminUsers} from "@/contexts/admin-users-context"
import {CreateUserModal} from "./create-user-modal"

export function UsersManager() {
  const {
    users,
    total,
    loading,
    error,
    page,
    pageSize,
    searchUserId,
    searchUsername,
    statusFilter,
    setPage,
    setPageSize,
    setSearchUserId,
    setSearchUsername,
    setStatusFilter,
    fetchUsers,
    getUserDetail,
    updateUserStatus,
    deleteUser
  } = useAdminUsers()

  const [selectedUser, setSelectedUser] = useState<AdminUser | null>(null)
  const [detailOpen, setDetailOpen] = useState(false)
  const [detailLoading, setDetailLoading] = useState(false)
  const [deleteTarget, setDeleteTarget] = useState<AdminUser | null>(null)
  const [deleteLoading, setDeleteLoading] = useState(false)
  const [createModalOpen, setCreateModalOpen] = useState(false)

  useEffect(() => {
    fetchUsers()
  }, [fetchUsers])

  const handleStatusToggle = async (user: AdminUser) => {
    await updateUserStatus(user)

    if (selectedUser?.id === user.id) {
      setSelectedUser(prev => prev ? { ...prev, is_active: !prev.is_active } : null)
    }
  }

  const handleShowDetail = async (user: AdminUser) => {
    setSelectedUser(user)
    setDetailOpen(true)
    setDetailLoading(true)

    try {
      const detail = await getUserDetail(user.id)
      setSelectedUser(detail)
    } catch {
      setSelectedUser(user)
    } finally {
      setDetailLoading(false)
    }
  }

  const handleDeleteUser = async () => {
    if (!deleteTarget) return

    setDeleteLoading(true)
    try {
      await deleteUser(deleteTarget)
      if (selectedUser?.id === deleteTarget.id) {
        setDetailOpen(false)
        setSelectedUser(null)
      }
      setDeleteTarget(null)
    } finally {
      setDeleteLoading(false)
    }
  }

  const displayValue = (value?: string) => value && value.trim() ? value : "-"

  const totalPages = Math.ceil(total / pageSize)
  const hasSearchFilter = Boolean(searchUserId || searchUsername)

  const renderFilterBar = () => (
    <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between gap-3">
      <div className="flex items-center gap-2 flex-wrap">
        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button
              variant="outline"
              size="sm"
              className={cn(
                "h-5 border-dashed text-[10px] font-medium shadow-none focus-visible:ring-0",
                hasSearchFilter && "bg-primary/5 border-primary/20"
              )}
            >
              <Search className="size-3 mr-1" />
              搜索
              {hasSearchFilter && (
                <>
                  <Separator orientation="vertical" className="mx-1" />
                  <Badge
                    variant="secondary"
                    className="text-[10px] h-3 px-1 rounded-full bg-primary text-primary-foreground"
                  >
                    !
                  </Badge>
                </>
              )}
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent className="w-56 p-3" align="start">
            <div className="space-y-2.5">
              <input
                className="w-full h-7 px-2 text-xs border border-dashed rounded-md outline-none focus:border-primary bg-background"
                placeholder="输入用户 ID..."
                value={searchUserId}
                onChange={(e) => setSearchUserId(e.target.value)}
              />
              <input
                className="w-full h-7 px-2 text-xs border border-dashed rounded-md outline-none focus:border-primary bg-background"
                placeholder="输入 username..."
                value={searchUsername}
                onChange={(e) => setSearchUsername(e.target.value)}
              />
              {hasSearchFilter && (
                <Button
                  variant="ghost"
                  size="sm"
                  className="w-full h-6 text-xs"
                  onClick={() => {
                    setSearchUserId("")
                    setSearchUsername("")
                  }}
                >
                  清除
                </Button>
              )}
            </div>
          </DropdownMenuContent>
        </DropdownMenu>

        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button
              variant="outline"
              size="sm"
              className={cn(
                "h-5 border-dashed text-[10px] font-medium shadow-none focus-visible:ring-0",
                statusFilter !== 'all' && "bg-primary/5 border-primary/20"
              )}
            >
              <Filter className="size-3" />
              状态
              {statusFilter !== 'all' && (
                <>
                  <Separator orientation="vertical" className="mx-1" />
                  <Badge
                    variant="secondary"
                    className="text-[10px] h-3 px-1 rounded-full bg-primary text-primary-foreground"
                  >
                    1
                  </Badge>
                </>
              )}
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent className="w-[120px]" align="start">
            <DropdownMenuItem
              onSelect={(e) => { e.preventDefault(); setStatusFilter('all') }}
            >
              <div className={cn(
                "mr-2 flex size-3 items-center justify-center rounded-sm border border-primary",
                statusFilter === 'all'
                  ? "bg-primary text-primary-foreground"
                  : "opacity-50"
              )} />
              <span className="text-xs">全部状态</span>
            </DropdownMenuItem>
            <DropdownMenuItem
              onSelect={(e) => { e.preventDefault(); setStatusFilter('active') }}
            >
              <div className={cn(
                "mr-2 flex size-3 items-center justify-center rounded-sm border border-primary",
                statusFilter === 'active'
                  ? "bg-primary text-primary-foreground"
                  : "opacity-50"
              )} />
              <span className="text-xs">正常</span>
            </DropdownMenuItem>
            <DropdownMenuItem
              onSelect={(e) => { e.preventDefault(); setStatusFilter('inactive') }}
            >
              <div className={cn(
                "mr-2 flex size-3 items-center justify-center rounded-sm border border-primary",
                statusFilter === 'inactive'
                  ? "bg-primary text-primary-foreground"
                  : "opacity-50"
              )} />
              <span className="text-xs">禁用</span>
            </DropdownMenuItem>
          </DropdownMenuContent>
        </DropdownMenu>

        {(hasSearchFilter || statusFilter !== 'all') && (
          <>
            <Separator orientation="vertical" className="h-6 hidden sm:block" />
            <Button
              variant="ghost"
              size="sm"
              onClick={() => {
                setSearchUserId("")
                setSearchUsername("")
                setStatusFilter('all')
              }}
              className="h-5 px-2 lg:px-3 text-[11px] font-medium text-muted-foreground hover:text-foreground"
            >
              <X className="size-3" />
              清空筛选
            </Button>
          </>
        )}
      </div>

      <Separator className="lg:hidden" />

      <div className="flex items-center gap-1.5 self-end lg:self-auto">
        <span className="text-[10px] text-muted-foreground whitespace-nowrap">
          {total} 条记录
        </span>
        <div className="flex items-center border border-dashed rounded-md shadow-none">
          <Button
            variant="ghost"
            size="icon"
            className="h-5.5 w-6 rounded-none rounded-l-md disabled:opacity-30"
            onClick={() => setPage(Math.max(1, page - 1))}
            disabled={page <= 1 || loading}
          >
            <ChevronLeft className="size-3" />
          </Button>
          <span className="text-[10px] font-mono text-muted-foreground px-2 border-x border-dashed">
            {page}/{totalPages}
          </span>
          <Button
            variant="ghost"
            size="icon"
            className="h-5.5 w-6 rounded-none rounded-r-md disabled:opacity-30"
            onClick={() => setPage(Math.min(totalPages, page + 1))}
            disabled={page >= totalPages || loading}
          >
            <ChevronRight className="size-3" />
          </Button>
        </div>

        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button variant="outline" size="sm" className="h-6 border-dashed text-[10px] px-2 font-mono shadow-none" disabled={loading}>
              {pageSize}条/页
              <ChevronDown className="size-3 opacity-50" />
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end">
            {[20, 50, 100].map(size => (
              <DropdownMenuItem
                key={size}
                onClick={() => setPageSize(size)}
                className={cn("font-mono text-xs", pageSize === size && "bg-accent")}
              >
                {size}条/页
              </DropdownMenuItem>
            ))}
          </DropdownMenuContent>
        </DropdownMenu>

        <Button
          variant="outline"
          size="icon"
          className="h-6 w-6 border-dashed shadow-none"
          onClick={() => fetchUsers(true)}
          disabled={loading}
          title="刷新数据"
        >
          <Loader2 className={cn("size-3", loading && "animate-spin")} />
        </Button>
      </div>
    </div>
  )

  return (
    <div className="py-6 space-y-4">
      <div className="flex items-center justify-between border-b border-border pb-2">
        <div className="flex flex-col gap-1">
          <div className="text-2xl font-semibold">用户管理</div>
        </div>
        <Button variant="secondary" size="sm" className="h-7 text-xs" onClick={() => setCreateModalOpen(true)}>
          <Plus className="size-3.5 mr-1" />
          新增用户
        </Button>
      </div>

      {renderFilterBar()}

      {error ? (
        <div className="p-8 border border-dashed rounded-lg">
          <ErrorInline error={error} onRetry={() => fetchUsers(true)} className="justify-center" />
        </div>
      ) : loading && users.length === 0 ? (
        <LoadingStateWithBorder icon={Layers} description="加载用户列表中..." />
      ) : users.length === 0 ? (
        <EmptyStateWithBorder icon={UserX} description="暂无用户数据" />
      ) : (
        <div className="border border-dashed shadow-none rounded-lg overflow-hidden">
          <Table className="w-full caption-bottom text-sm min-w-full">
            <TableHeader className="sticky top-0 z-20 bg-background">
              <TableRow className="border-b border-dashed hover:bg-transparent">
                <TableHead className="w-[90px] whitespace-nowrap py-2 h-8">ID</TableHead>
                <TableHead className="w-[120px] whitespace-nowrap py-2 h-8">用户</TableHead>

                <TableHead className="whitespace-nowrap min-w-[140px] py-2 h-8 pl-4">上次登陆</TableHead>
                <TableHead className="whitespace-nowrap min-w-[140px] py-2 h-8">注册时间</TableHead>
                <TableHead className="whitespace-nowrap min-w-[140px] py-2 h-8">上次更新</TableHead>
                <TableHead className="sticky right-0 text-center bg-background z-10 w-[110px] py-2 h-8">操作</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {users.map((user) => (
                <TableRow
                  key={user.id}
                  className="border-dashed hover:bg-muted/30 cursor-pointer group"
                  onClick={() => handleShowDetail(user)}
                >
                  <TableCell className="font-mono text-[11px] text-muted-foreground py-1">{user.id}</TableCell>
                  <TableCell className="py-1">
                    <div className="flex items-center gap-2">
                      <Avatar className="h-7 w-7 rounded-sm border">
                        <AvatarImage src={user.avatar_url} />
                        <AvatarFallback className="rounded-sm text-[10px]">
                          {user.username.substring(0, 2).toUpperCase()}
                        </AvatarFallback>
                      </Avatar>
                      <div className="flex flex-col gap-0">
                        <div className="flex items-center gap-1.5">
                          <span className="font-medium text-[11px] leading-tight max-w-[100px] truncate" title={user.nickname}>{user.nickname}</span>
                          {user.is_admin && (
                            <Badge variant="secondary" className="text-[9px] h-3.5 px-0.5 rounded-[2px] font-normal leading-none tracking-tighter">
                              ADM
                            </Badge>
                          )}
                        </div>
                        <div className="flex items-center gap-1.5">
                          <span className="text-[10px] text-muted-foreground font-mono leading-tight">@{user.username}</span>
                        </div>
                      </div>
                    </div>
                  </TableCell>

                  <TableCell className="text-[10px] text-muted-foreground font-mono whitespace-nowrap py-1 pl-4">
                    {formatDateTime(user.last_login_at)}
                  </TableCell>
                  <TableCell className="text-[10px] text-muted-foreground font-mono whitespace-nowrap py-1">
                    {formatDateTime(user.created_at)}
                  </TableCell>
                  <TableCell className="text-[10px] text-muted-foreground font-mono whitespace-nowrap py-1">
                    {formatDateTime(user.updated_at)}
                  </TableCell>
                  <TableCell className="sticky right-0 text-center bg-background z-10 py-1" onClick={(e) => e.stopPropagation()}>
                    <div className="flex items-center justify-center gap-0.5">
                      <TooltipProvider delayDuration={0}>
                        <Tooltip>
                          <TooltipTrigger asChild>
                            <div>
                              <Switch
                                checked={user.is_active}
                                onCheckedChange={() => handleStatusToggle(user)}
                                disabled={user.is_admin}
                                className="scale-75 data-[state=checked]:bg-green-600 h-4 w-7"
                              />
                            </div>
                          </TooltipTrigger>
                          <TooltipContent side="top" className="text-xs">
                            {user.is_admin ? '管理员账户' : user.is_active ? '禁用账户' : '启用账户'}
                          </TooltipContent>
                        </Tooltip>
                      </TooltipProvider>

                      <TooltipProvider delayDuration={0}>
                        <Tooltip>
                          <TooltipTrigger asChild>
                            <Button variant="ghost" size="icon" className="h-6 w-6 text-muted-foreground hover:text-foreground" onClick={() => handleShowDetail(user)}>
                              <Eye className="size-3" />
                            </Button>
                          </TooltipTrigger>
                          <TooltipContent side="top" className="text-xs">
                            查看详情
                          </TooltipContent>
                        </Tooltip>
                      </TooltipProvider>

                      {!user.is_admin && (
                        <TooltipProvider delayDuration={0}>
                          <Tooltip>
                            <TooltipTrigger asChild>
                              <Button
                                variant="ghost"
                                size="icon"
                                className="h-6 w-6 text-muted-foreground hover:text-destructive"
                                onClick={() => setDeleteTarget(user)}
                              >
                                <Trash2 className="size-3" />
                              </Button>
                            </TooltipTrigger>
                            <TooltipContent side="top" className="text-xs">
                              删除用户
                            </TooltipContent>
                          </Tooltip>
                        </TooltipProvider>
                      )}
                    </div>
                  </TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        </div>
      )}

      <Sheet open={detailOpen} onOpenChange={setDetailOpen}>
        <SheetContent className="sm:max-w-[400px] w-full p-0 flex flex-col gap-0">
          <SheetTitle className="px-5 py-3">用户档案</SheetTitle>

          {selectedUser && (
            <>
              <div className="flex-1 overflow-y-auto scrollbar-thin scrollbar-thumb-border scrollbar-track-transparent">
                <div className="flex flex-col pb-6">
                  <div className="px-5 py-6 border-b border-border/50">
                    <div className="flex flex-col items-center text-center gap-3">
                      <Avatar className="h-20 w-20 rounded-full border-4 border-background ring-1 ring-border/20">
                        <AvatarImage src={selectedUser.avatar_url} />
                        <AvatarFallback className="rounded-full text-xl font-medium bg-secondary text-secondary-foreground">
                          {selectedUser.username.substring(0, 2).toUpperCase()}
                        </AvatarFallback>
                      </Avatar>

                      <div className="space-y-1.5">
                        <h3 className="text-lg font-bold tracking-tight">{selectedUser.nickname}</h3>
                        <div className="flex items-center justify-center gap-2">
                          <code className="px-1.5 py-0.5 rounded-md bg-muted text-[10px] font-mono text-muted-foreground">@{selectedUser.username}</code>
                          <Badge variant="secondary" className="h-4.5 px-1.5 text-[9px] uppercase font-medium">
                            UID: {selectedUser.id}
                          </Badge>
                          {selectedUser.is_admin && (
                            <Badge className="h-4.5 px-1.5 text-[9px] uppercase font-medium bg-primary text-primary-foreground">
                              Admin
                            </Badge>
                          )}
                        </div>
                      </div>

                      {detailLoading && (
                        <div className="flex items-center gap-1 text-[10px] text-muted-foreground">
                          <Loader2 className="size-3 animate-spin" />
                          正在刷新详情
                        </div>
                      )}

                      <div className="gap-4 w-full max-w-[240px] mt-1 pt-4 border-t border-border/50">
                        <div className="flex flex-col gap-0.5">
                          <span className="text-[9px] uppercase tracking-widest text-muted-foreground font-medium">注册时间</span>
                          <span className="font-mono text-xs font-semibold">{formatDateTime(selectedUser.created_at).split(' ')[0]}</span>
                        </div>
                      </div>
                    </div>
                  </div>

                  <div className="p-6 space-y-6">
                    <div className="space-y-4">
                      <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider px-1">个人资料</h4>
                      <div className="rounded-lg border divide-y bg-background/50">
                        <div className="flex items-center justify-between gap-4 p-3.5 text-sm">
                          <span className="flex items-center gap-2 text-[10px] text-muted-foreground">
                            <Mail className="size-3" />
                            邮箱
                          </span>
                          <span className="min-w-0 truncate text-right text-[10px]">{displayValue(selectedUser.email)}</span>
                        </div>
                        <div className="flex items-center justify-between gap-4 p-3.5 text-sm">
                          <span className="flex items-center gap-2 text-[10px] text-muted-foreground">
                            <Smartphone className="size-3" />
                            手机
                          </span>
                          <span className="min-w-0 truncate text-right text-[10px]">{displayValue(selectedUser.phone)}</span>
                        </div>
                        <div className="flex items-center justify-between gap-4 p-3.5 text-sm">
                          <span className="flex items-center gap-2 text-[10px] text-muted-foreground">
                            <VenusAndMars className="size-3" />
                            性别
                          </span>
                          <span className="min-w-0 truncate text-right text-[10px]">{displayValue(selectedUser.gender)}</span>
                        </div>
                        <div className="flex items-center justify-between gap-4 p-3.5 text-sm">
                          <span className="flex items-center gap-2 text-[10px] text-muted-foreground">
                            <MapPin className="size-3" />
                            所在地
                          </span>
                          <span className="min-w-0 truncate text-right text-[10px]">{displayValue(selectedUser.location)}</span>
                        </div>
                        <div className="flex items-center justify-between gap-4 p-3.5 text-sm">
                          <span className="flex items-center gap-2 text-[10px] text-muted-foreground">
                            <Globe className="size-3" />
                            网站
                          </span>
                          <span className="min-w-0 truncate text-right text-[10px]">{displayValue(selectedUser.website)}</span>
                        </div>
                        <div className="flex flex-col gap-2 p-3.5 text-sm">
                          <span className="text-[10px] text-muted-foreground">简介</span>
                          <span className="break-words text-[10px] leading-5">{displayValue(selectedUser.bio)}</span>
                        </div>
                      </div>
                    </div>

                    <div className="space-y-4">
                      <h4 className="text-xs font-semibold text-muted-foreground uppercase tracking-wider px-1">系统记录</h4>
                      <div className="rounded-lg border divide-y bg-background/50">
                        <div className="flex items-center justify-between p-3.5 text-sm">
                          <span className="text-[10px]">账户状态</span>
                          <Badge variant={selectedUser.is_active ? "secondary" : "outline"} className="text-[10px]">
                            {selectedUser.is_active ? "正常" : "禁用"}
                          </Badge>
                        </div>
                        <div className="flex items-center justify-between p-3.5 text-sm">
                          <span className="text-[10px]">管理员</span>
                          <span className="font-mono text-[10px]">{selectedUser.is_admin ? "是" : "否"}</span>
                        </div>
                        <div className="flex items-center justify-between p-3.5 text-sm">
                          <span className="text-[10px]">最后登录</span>
                          <span className="font-mono text-[10px]">{formatDateTime(selectedUser.last_login_at)}</span>
                        </div>
                        <div className="flex items-center justify-between p-3.5 text-sm">
                          <span className="text-[10px]">注册时间</span>
                          <span className="font-mono text-[10px]">{formatDateTime(selectedUser.created_at)}</span>
                        </div>
                        <div className="flex items-center justify-between p-3.5 text-sm">
                          <span className="text-[10px]">最后更新</span>
                          <span className="font-mono text-[10px]">{formatDateTime(selectedUser.updated_at)}</span>
                        </div>
                      </div>
                    </div>
                  </div>

                </div>
              </div>

              {!selectedUser.is_admin && (
                <div className="p-4 border-t bg-background/80 backdrop-blur-md shrink-0 flex flex-col gap-2">
                  <Button
                    variant={selectedUser.is_active ? "destructive" : "default"}
                    className={cn(
                      "w-full h-9 text-xs font-medium transition-all active:scale-[0.98]",
                      selectedUser.is_active
                        ? "bg-red-500 hover:bg-red-600 text-white"
                        : "bg-primary text-primary-foreground hover:bg-primary/90"
                    )}
                    onClick={() => handleStatusToggle(selectedUser)}
                  >
                    {selectedUser.is_active ? (
                      <>
                        <ShieldCheck className="size-3 mr-1" />
                        封禁账户
                      </>
                    ) : (
                      <>
                        <UserCheck className="size-3 mr-1" />
                        解除封禁
                      </>
                    )}
                  </Button>
                  <Button
                    variant="outline"
                    className="w-full h-9 text-xs font-medium"
                    onClick={() => setDeleteTarget(selectedUser)}
                  >
                    <Trash2 className="size-3 mr-1" />
                    删除用户
                  </Button>
                </div>
              )}
            </>
          )}
        </SheetContent>
      </Sheet>

      <AlertDialog open={!!deleteTarget} onOpenChange={(open) => !open && !deleteLoading && setDeleteTarget(null)}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>确认删除用户</AlertDialogTitle>
            <AlertDialogDescription>
              确定要删除用户 {deleteTarget?.nickname || deleteTarget?.username} 吗？该操作会移除用户账号，删除后无法撤销。
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel disabled={deleteLoading}>取消</AlertDialogCancel>
            <AlertDialogAction onClick={handleDeleteUser} disabled={deleteLoading}>
              {deleteLoading && <Loader2 className="size-3 animate-spin" />}
              确认删除
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>

      <CreateUserModal isOpen={createModalOpen} onClose={() => setCreateModalOpen(false)} />
    </div>
  )
}