"use client"

import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar"
import { Badge } from "@/components/ui/badge"
import { Button } from "@/components/ui/button"
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuGroup,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu"
import { Sheet, SheetContent, SheetHeader, SheetTitle, SheetTrigger } from "@/components/ui/sheet"
import { getCurrentUserForLogin, logout as logoutRequest, switchCurrentRole } from "@/lib/api"
import { toApiError } from "@/lib/errors"
import { useMyShop } from "@/lib/hooks/use-my-shop"
import { notifyInfo } from "@/lib/toast"
import type { UserRole } from "@/lib/types"
import { cn } from "@/lib/utils"
import { useAuthStore } from "@/store/auth"
import { useNotificationStore } from "@/store/notifications"
import {
  Bell,
  Gamepad2,
  LogOut,
  Menu,
  MessageSquare,
  Settings,
  ShoppingBag,
  User,
  Wallet,
} from "lucide-react"
import Link from "next/link"
import { usePathname, useRouter } from "next/navigation"
import { useEffect, useState } from "react"

import { canAccessDashboard } from "@/components/role-guard"

const roleLabels = {
  consumer: "客户",
  player: "打手",
  owner: "店主",
  admin: "管理员",
} satisfies Record<UserRole, string>

export function Header() {
  const [mobileOpen, setMobileOpen] = useState(false)
  const pathname = usePathname()
  const router = useRouter()
  const {
    isAuthenticated,
    currentRole,
    verifiedRoles,
    login,
    logout: clearAuth,
    user,
  } = useAuthStore()
  const canOpenDashboard = currentRole === "player" || currentRole === "owner"
  const { shop: ownerShop } = useMyShop(isAuthenticated && currentRole === "owner")
  const fetchNotifications = useNotificationStore((state) => state.fetchNotifications)

  useEffect(() => {
    if (!isAuthenticated) return
    void fetchNotifications()
  }, [fetchNotifications, isAuthenticated])

  const navLinks =
    currentRole === "consumer"
      ? [
          { href: "/", label: "发现" },
          { href: "/community", label: "社区" },
          { href: "/orders", label: "订单" },
          { href: "/chat", label: "消息" },
        ]
      : [
          { href: "/", label: "发现" },
          { href: "/community", label: "社区" },
          { href: "/orders", label: "订单" },
          { href: "/chat", label: "消息" },
          ...(canOpenDashboard ? [{ href: "/dashboard", label: "管理后台" }] : []),
        ]

  const availableRoles = (Object.entries(roleLabels) as [UserRole, string][]).filter(([role]) =>
    verifiedRoles.includes(role),
  )

  const handleRoleSwitch = (role: UserRole) => {
    if (role === currentRole) {
      setMobileOpen(false)
      return
    }

    void (async () => {
      try {
        await switchCurrentRole(role)
        const updated = await getCurrentUserForLogin()
        login(updated, updated.verifiedRoles ?? [updated.role])
        if (pathname.startsWith("/dashboard") && !canAccessDashboard(role, pathname)) {
          router.push(role === "consumer" ? "/" : "/dashboard")
        }
      } catch (error) {
        notifyInfo(toApiError(error).msg)
      } finally {
        setMobileOpen(false)
      }
    })()
  }

  const handleLogout = () => {
    void (async () => {
      try {
        await logoutRequest()
      } catch (error) {
        notifyInfo(toApiError(error).msg)
      } finally {
        clearAuth()
        useNotificationStore.getState().invalidate()
        setMobileOpen(false)
        router.push("/")
      }
    })()
  }

  const unreadCount = useNotificationStore(
    (state) => state.notifications.filter((notification) => !notification.read).length,
  )

  const profileHref =
    currentRole === "player"
      ? user
        ? `/player/${user.id}`
        : "/settings"
      : currentRole === "owner"
        ? ownerShop
          ? `/shop/${ownerShop.id}`
          : "/dashboard/shop"
        : user
          ? `/user/${user.id}`
          : "/settings"

  return (
    <header className="sticky top-0 z-50 w-full border-b border-border/40 bg-background/80 backdrop-blur-md supports-[backdrop-filter]:bg-background/60">
      <div className="container mx-auto flex h-16 items-center justify-between px-4 md:px-6">
        <div className="flex items-center gap-6">
          <Link href="/" className="flex items-center gap-2 font-bold text-lg shrink-0">
            <Gamepad2 className="h-5 w-5" />
            聚玩
          </Link>

          <nav className="hidden md:flex items-center gap-1">
            {navLinks.map((link) => {
              const isActive =
                pathname === link.href || (link.href !== "/" && pathname.startsWith(link.href))
              return (
                <Button
                  key={link.href}
                  variant={isActive ? "secondary" : "ghost"}
                  className={!isActive ? "text-muted-foreground" : undefined}
                  asChild
                >
                  <Link href={link.href}>{link.label}</Link>
                </Button>
              )
            })}
          </nav>
        </div>
        <div className="flex items-center justify-end gap-1">
          {isAuthenticated ? (
            <>
              <DropdownMenu>
                <DropdownMenuTrigger asChild>
                  <Button
                    variant="ghost"
                    size="sm"
                    className="hidden md:flex text-xs h-8 text-muted-foreground hover:text-foreground"
                  >
                    {roleLabels[currentRole]}
                  </Button>
                </DropdownMenuTrigger>
                <DropdownMenuContent align="end" className="space-y-1">
                  <DropdownMenuLabel>切换身份</DropdownMenuLabel>
                  <DropdownMenuSeparator />
                  {availableRoles.map(([role, label]) => (
                    <DropdownMenuItem
                      key={role}
                      onClick={() => handleRoleSwitch(role)}
                      className={cn(
                        currentRole === role && "bg-accent text-accent-foreground rounded-md",
                      )}
                    >
                      {label}
                    </DropdownMenuItem>
                  ))}
                </DropdownMenuContent>
              </DropdownMenu>

              <Button
                variant="ghost"
                size="icon"
                className="relative h-9 w-9 text-muted-foreground hover:text-foreground"
                asChild
              >
                <Link href="/notifications">
                  <Bell className="h-4 w-4" />
                  {unreadCount > 0 && (
                    <Badge className="absolute -top-1 -right-1 h-4 min-w-4 px-1 flex items-center justify-center text-[10px]">
                      {unreadCount}
                    </Badge>
                  )}
                </Link>
              </Button>

              <DropdownMenu>
                <DropdownMenuTrigger asChild>
                  <Button
                    variant="ghost"
                    size="icon"
                    className="rounded-full h-9 w-9 text-muted-foreground hover:text-foreground"
                  >
                    <Avatar className="h-7 w-7">
                      <AvatarImage src={user?.avatar} />
                      <AvatarFallback>{user?.nickname?.[0] ?? "?"}</AvatarFallback>
                    </Avatar>
                  </Button>
                </DropdownMenuTrigger>
                <DropdownMenuContent align="end" className="w-48">
                  <DropdownMenuLabel>{user?.nickname ?? "未登录"}</DropdownMenuLabel>
                  <DropdownMenuSeparator />
                  <DropdownMenuGroup>
                    <DropdownMenuItem asChild>
                      <Link href={profileHref}>
                        <User className="mr-2 h-4 w-4" />
                        个人主页
                      </Link>
                    </DropdownMenuItem>
                    <DropdownMenuItem asChild>
                      <Link href="/orders">
                        <ShoppingBag className="mr-2 h-4 w-4" />
                        我的订单
                      </Link>
                    </DropdownMenuItem>
                    <DropdownMenuItem asChild>
                      <Link href="/chat">
                        <MessageSquare className="mr-2 h-4 w-4" />
                        消息
                      </Link>
                    </DropdownMenuItem>
                    <DropdownMenuItem asChild>
                      <Link href="/wallet">
                        <Wallet className="mr-2 h-4 w-4" />
                        钱包
                      </Link>
                    </DropdownMenuItem>
                    {canOpenDashboard && (
                      <DropdownMenuItem asChild>
                        <Link href="/dashboard">
                          <Gamepad2 className="mr-2 h-4 w-4" />
                          管理后台
                        </Link>
                      </DropdownMenuItem>
                    )}
                    <DropdownMenuItem asChild>
                      <Link href="/settings">
                        <Settings className="mr-2 h-4 w-4" />
                        设置
                      </Link>
                    </DropdownMenuItem>
                  </DropdownMenuGroup>
                  <DropdownMenuSeparator />
                  <DropdownMenuItem onClick={handleLogout}>
                    <LogOut className="mr-2 h-4 w-4" />
                    退出登录
                  </DropdownMenuItem>
                </DropdownMenuContent>
              </DropdownMenu>
            </>
          ) : (
            <div className="hidden md:flex items-center gap-1">
              <Button variant="ghost" className="text-muted-foreground" asChild>
                <Link href="/login">登录</Link>
              </Button>
              <Button variant="ghost" className="text-muted-foreground" asChild>
                <Link href="/register">注册</Link>
              </Button>
            </div>
          )}

          <Sheet open={mobileOpen} onOpenChange={setMobileOpen}>
            <SheetTrigger asChild>
              <Button
                variant="ghost"
                size="icon"
                className="md:hidden h-9 w-9 text-muted-foreground hover:text-foreground"
              >
                <Menu className="h-5 w-5" />
              </Button>
            </SheetTrigger>
            <SheetContent side="right" className="w-72">
              <SheetHeader>
                <SheetTitle className="flex items-center gap-2">
                  <Gamepad2 className="h-5 w-5" />
                  聚玩
                </SheetTitle>
              </SheetHeader>
              <div className="mt-4 space-y-4">
                {isAuthenticated && (
                  <div className="flex items-center gap-2 px-1">
                    <Avatar className="h-8 w-8">
                      <AvatarImage src={user?.avatar} />
                      <AvatarFallback>{user?.nickname?.[0] ?? "?"}</AvatarFallback>
                    </Avatar>
                    <div className="flex-1 min-w-0">
                      <p className="text-sm font-medium truncate">{user?.nickname ?? "未登录"}</p>
                      <p className="text-xs text-muted-foreground">{roleLabels[currentRole]}</p>
                    </div>
                  </div>
                )}

                <nav className="flex flex-col gap-1">
                  {navLinks.map((link) => {
                    const isActive =
                      pathname === link.href ||
                      (link.href !== "/" && pathname.startsWith(link.href))
                    return (
                      <Button
                        key={link.href}
                        variant={isActive ? "secondary" : "ghost"}
                        className={cn("w-full justify-start", !isActive && "text-muted-foreground")}
                        asChild
                      >
                        <Link href={link.href} onClick={() => setMobileOpen(false)}>
                          {link.label}
                        </Link>
                      </Button>
                    )
                  })}
                  {isAuthenticated && (
                    <>
                      <Button
                        variant={pathname === "/wallet" ? "secondary" : "ghost"}
                        className={cn(
                          "w-full justify-start",
                          pathname !== "/wallet" && "text-muted-foreground",
                        )}
                        asChild
                      >
                        <Link href="/wallet" onClick={() => setMobileOpen(false)}>
                          钱包
                        </Link>
                      </Button>
                      <Button
                        variant={pathname === "/settings" ? "secondary" : "ghost"}
                        className={cn(
                          "w-full justify-start",
                          pathname !== "/settings" && "text-muted-foreground",
                        )}
                        asChild
                      >
                        <Link href="/settings" onClick={() => setMobileOpen(false)}>
                          设置
                        </Link>
                      </Button>
                    </>
                  )}
                </nav>

                {isAuthenticated && (
                  <div className="border-t pt-4">
                    <p className="px-3 text-xs text-muted-foreground mb-2">切换身份</p>
                    <div className="flex gap-2 px-3">
                      {availableRoles.map(([role, label]) => (
                        <Button
                          key={role}
                          variant={currentRole === role ? "default" : "outline"}
                          size="sm"
                          className="text-xs flex-1"
                          onClick={() => handleRoleSwitch(role)}
                        >
                          {label}
                        </Button>
                      ))}
                    </div>
                  </div>
                )}

                {!isAuthenticated && (
                  <div className="border-t pt-4 flex gap-2 px-3">
                    <Button variant="outline" className="flex-1" asChild>
                      <Link href="/login" onClick={() => setMobileOpen(false)}>
                        登录
                      </Link>
                    </Button>
                    <Button className="flex-1" asChild>
                      <Link href="/register" onClick={() => setMobileOpen(false)}>
                        注册
                      </Link>
                    </Button>
                  </div>
                )}
              </div>
            </SheetContent>
          </Sheet>
        </div>
      </div>
    </header>
  )
}