"use client";

import { useState, useEffect } from "react";
import { useRouter } from "next/navigation";
import { useTheme } from "next-themes";
import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Avatar, AvatarFallback, AvatarImage } from "@/components/ui/avatar";
import { useUser } from "@/providers/user-provider";
import { useNotifications } from "@/providers/notification-provider";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import { Badge } from "@/components/ui/badge";
import {
  Search,
  Bell,
  Sun,
  Moon,
  Menu,
  LogOut,
  User,
  Settings,
  CheckCheck,
  Trash2,
} from "lucide-react";

interface TopbarProps {
  onMenuClick: () => void;
}

export function Topbar({ onMenuClick }: TopbarProps) {
  const router = useRouter();
  const { theme, setTheme } = useTheme();
  const { user, logout } = useUser();
  const { notifications, unreadCount, markAsRead, markAllAsRead, dismiss } =
    useNotifications();
  const [mounted, setMounted] = useState(false);
  const [searchOpen, setSearchOpen] = useState(false);

  useEffect(() => {
    setMounted(true);
  }, []);
  if (!user) return null;

  function formatTimeAgo(ts: string): string {
    const diff = Date.now() - new Date(ts).getTime();
    const mins = Math.floor(diff / 60000);
    if (mins < 1) return "Just now";
    if (mins < 60) return `${mins}m ago`;
    const hrs = Math.floor(mins / 60);
    if (hrs < 24) return `${hrs}h ago`;
    const days = Math.floor(hrs / 24);
    if (days < 7) return `${days}d ago`;
    return new Date(ts).toLocaleDateString();
  }
  const initials = user.name
    .split(" ")
    .map((n: string) => n[0])
    .join("")
    .toUpperCase();

  return (
    <header className="sticky top-0 z-20 flex h-16 items-center gap-4 border-b bg-background px-4 lg:px-6">
      {/* Logo */}
      <div className="flex items-center gap-2 mr-2 shrink-0">
        <div className="w-3 h-3 rounded-full bg-[#0d9488]" />
        <span className="text-[#0d9488] font-bold text-sm tracking-wide">
          CRM
        </span>
      </div>

      {/* Mobile menu button */}
      <Button
        variant="ghost"
        size="icon"
        className="lg:hidden"
        onClick={onMenuClick}
      >
        <Menu className="h-5 w-5" />
      </Button>

      {/* Search */}
      <div className="relative hidden flex-1 sm:block md:w-80">
        <Search className="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
        <Input
          placeholder="Search leads, companies..."
          className="h-9 w-full max-w-sm pl-9 bg-muted/50"
        />
      </div>

      <div className="flex flex-1 items-center justify-end gap-3">
        {/* Mobile search toggle */}
        <Button
          variant="ghost"
          size="icon"
          className="sm:hidden"
          onClick={() => setSearchOpen(!searchOpen)}
        >
          <Search className="h-5 w-5" />
        </Button>

        {/* Theme toggle */}
        <Button
          variant="ghost"
          size="icon"
          onClick={() => setTheme(theme === "dark" ? "light" : "dark")}
          className="text-muted-foreground"
        >
          {mounted ? (
            theme === "dark" ? (
              <Sun className="h-5 w-5" />
            ) : (
              <Moon className="h-5 w-5" />
            )
          ) : (
            <div className="h-5 w-5" />
          )}
        </Button>

        {/* Notifications */}
        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button
              variant="ghost"
              size="icon"
              className="relative text-muted-foreground"
            >
              <Bell className="h-5 w-5" />
              <span className="absolute -right-0.5 -top-0.5 flex h-4 w-4 items-center justify-center rounded-full bg-primary text-[10px] font-medium text-primary-foreground">
                3
              </span>
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end" className="w-80">
            <DropdownMenuLabel className="flex items-center justify-between">
              <span>Notifications</span>
              {notifications.length > 0 && (
                <button
                  onClick={markAllAsRead}
                  className="flex items-center gap-1 text-xs text-primary hover:underline"
                >
                  <CheckCheck className="h-3 w-3" />
                  Mark all read
                </button>
              )}
            </DropdownMenuLabel>
            <DropdownMenuSeparator />
            {notifications.length === 0 ? (
              <div className="py-6 text-center text-sm text-muted-foreground">
                No notifications
              </div>
            ) : (
              <div className="max-h-[360px] space-y-1 overflow-y-auto p-2">
                {notifications.slice(0, 20).map((n) => (
                  <div
                    key={n.id}
                    role="button"
                    tabIndex={0}
                    onClick={() => {
                      if (!n.read) markAsRead(n.id);
                      if (n.link) router.push(n.link);
                    }}
                    className={`flex cursor-pointer items-start gap-3 rounded-lg p-2 transition-colors hover:bg-muted/50 ${!n.read ? "bg-muted/30" : ""}`}
                  >
                    <div
                      className={`mt-2 h-2 w-2 shrink-0 rounded-full ${n.read ? "bg-transparent" : "bg-primary"}`}
                    />
                    <div className="flex-1 space-y-0.5">
                      <p className="text-sm font-medium">{n.title}</p>
                      <p className="text-xs text-muted-foreground">
                        {n.description}
                      </p>
                      <p className="text-[10px] text-muted-foreground/60">
                        {formatTimeAgo(n.timestamp)}
                      </p>
                    </div>
                    <button
                      onClick={(e) => {
                        e.stopPropagation();
                        dismiss(n.id);
                      }}
                      className="mt-1 shrink-0 text-muted-foreground/40 hover:text-destructive"
                    >
                      <Trash2 className="h-3 w-3" />
                    </button>
                  </div>
                ))}
              </div>
            )}
          </DropdownMenuContent>
        </DropdownMenu>

        {/* User profile */}
        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button variant="ghost" className="relative h-9 gap-2 pl-2 pr-3">
              <Avatar className="h-7 w-7">
                <AvatarImage src={user.avatar} />
                <AvatarFallback>{initials}</AvatarFallback>
              </Avatar>
              <span className="hidden text-sm font-medium md:inline-block">
                {user.name}
              </span>
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end" className="w-56">
            <DropdownMenuLabel className="font-normal">
              <div className="flex flex-col space-y-1">
                <p className="text-sm font-medium">{user.name}</p>
                <p className="text-xs text-muted-foreground">{user.email}</p>
                <Badge
                  variant="secondary"
                  className="mt-1 w-fit text-xs capitalize"
                >
                  {user.role}
                </Badge>
              </div>
            </DropdownMenuLabel>
            <DropdownMenuSeparator />
            <DropdownMenuItem onClick={() => router.push("/profile")}>
              <User className="mr-2 h-4 w-4" />
              Profile
            </DropdownMenuItem>
            <DropdownMenuItem onClick={() => router.push("/settings")}>
              <Settings className="mr-2 h-4 w-4" />
              Settings
            </DropdownMenuItem>
            <DropdownMenuSeparator />
            <DropdownMenuItem className="text-destructive" onClick={logout}>
              <LogOut className="mr-2 h-4 w-4" />
              Log out
            </DropdownMenuItem>
          </DropdownMenuContent>
        </DropdownMenu>
      </div>
    </header>
  );
}
