"use client";

import { useState, useRef, useEffect } from "react";
import { useAuth } from "@/features/agent/hooks/useAuth";
import { getAvatarUrl, getAvatarColor, getAvatarInitial } from "@/utils/avatar";
import { Button } from "@/components/ui/button";
import { websiteConfig } from "@/lib/website-config";
import { Badge } from "@/components/ui/badge";
import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from "@/components/ui/tooltip";
import { LanguageSwitcher } from "@/components/i18n/LanguageSwitcher";
import { useI18n } from "@/lib/i18n/provider";
import {
  AGENT_PAGES,
  type AgentPageItem,
  type NavigationPage,
} from "@/lib/constants/agent-pages";

export type { NavigationPage };

interface NavigationSidebarProps {
  currentPage?: NavigationPage;
  onNavigate?: (page: NavigationPage) => void;
  onProfileClick?: () => void;
  onLogout?: () => void;
  avatarUrl?: string | null;
  /** 顶部/左侧“对话”图标角标展示用：总未读消息数 */
  unreadChatCount?: number;
}

export function NavigationSidebar({
  currentPage = "dashboard",
  onNavigate,
  onProfileClick,
  onLogout,
  avatarUrl,
  unreadChatCount = 0,
}: NavigationSidebarProps) {
  const { agent } = useAuth();
  const { t } = useI18n();
  const [profileMenuOpen, setProfileMenuOpen] = useState(false);
  const menuRef = useRef<HTMLDivElement>(null);

  const isAdmin = agent?.role === "admin";
  const permissions = agent?.permissions ?? [];

  const handleNavigate = (page: NavigationPage) => {
    onNavigate?.(page);
  };

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (menuRef.current && !menuRef.current.contains(event.target as Node)) {
        setProfileMenuOpen(false);
      }
    };

    if (profileMenuOpen) {
      document.addEventListener("mousedown", handleClickOutside);
    }

    return () => {
      document.removeEventListener("mousedown", handleClickOutside);
    };
  }, [profileMenuOpen]);

  const avatarColor = getAvatarColor(agent?.username || "");
  const displayInitial = getAvatarInitial(agent?.username || "");
  const fullAvatarUrl = getAvatarUrl(avatarUrl);

  const visiblePages = AGENT_PAGES.filter((p) => {
    if (isAdmin) return true;
    const need = p.requiredPermission;
    if (!need) return true;
    return permissions.includes(need);
  }) as unknown as AgentPageItem[];

  return (
    <TooltipProvider delayDuration={0}>
      <div className="w-16 bg-gray-50 flex flex-col items-center py-4 border-r border-gray-200 h-full">
        <div className="mt-2 px-3 flex flex-col items-center gap-2">
          {visiblePages.map((page) => {
            const isActive = currentPage === page.id;
            const Icon = page.Icon;
            const showUnread = page.id === "dashboard" && unreadChatCount > 0;
            const pageTitle = page.titleKey ? t(page.titleKey) : page.title;
            return (
              <Tooltip key={page.id}>
                <TooltipTrigger asChild>
                  <button
                    className={`w-10 h-10 rounded-lg flex items-center justify-center transition-colors ${
                      isActive
                        ? "bg-green-600 hover:bg-green-700 text-white"
                        : "bg-white border border-gray-200 hover:bg-gray-100 text-gray-700"
                    }`}
                    onClick={() => handleNavigate(page.id as NavigationPage)}
                    aria-label={pageTitle}
                  >
                    <div className="relative flex items-center justify-center">
                      <Icon className={`h-5 w-5 ${isActive ? "text-white" : "text-gray-600"}`} />
                      {showUnread && (
                        <Badge
                          variant="destructive"
                          className="absolute -top-1 -right-1 px-1 py-0 h-4 min-w-4 rounded-full text-[10px] leading-none flex items-center justify-center"
                        >
                          {unreadChatCount > 99 ? "99+" : unreadChatCount}
                        </Badge>
                      )}
                    </div>
                  </button>
                </TooltipTrigger>
                <TooltipContent side="right">{pageTitle}</TooltipContent>
              </Tooltip>
            );
          })}
        </div>

      {/* 个人资料按钮和 GitHub 按钮（固定在底部） */}
        <div className="mt-auto flex flex-col items-center gap-2">
          <LanguageSwitcher variant="ghost" size="icon" className="text-gray-700 hover:text-gray-900" />
          <div className="relative" ref={menuRef}>
            <Tooltip>
              <TooltipTrigger asChild>
                <button
                  className={`w-10 h-10 rounded-lg flex items-center justify-center transition-colors ${
                    profileMenuOpen
                      ? "bg-primary text-primary-foreground"
                      : "bg-white border border-gray-200 hover:bg-gray-100"
                  }`}
                  onClick={() => setProfileMenuOpen(!profileMenuOpen)}
                  aria-label={t("agent.profile")}
                >
                  <div className="flex items-center justify-center">
                    {fullAvatarUrl ? (
                      <img
                        src={fullAvatarUrl}
                        alt={agent?.username || "用户"}
                        className="w-8 h-8 rounded-full object-cover"
                      />
                    ) : (
                      <div
                        className="w-8 h-8 rounded-full flex items-center justify-center text-white text-xs font-semibold"
                        style={{ backgroundColor: avatarColor }}
                      >
                        {displayInitial}
                      </div>
                    )}
                  </div>
                </button>
              </TooltipTrigger>
              <TooltipContent side="right">{t("agent.profile")}</TooltipContent>
            </Tooltip>

          {profileMenuOpen && (
            <div className="absolute bottom-12 left-0 w-64 bg-white border border-gray-200 rounded-lg shadow-lg z-50">
              <div className="p-4 border-b border-gray-200">
                <div className="flex items-center gap-3">
                  {fullAvatarUrl ? (
                    <img
                      src={fullAvatarUrl}
                      alt={agent?.username || "用户"}
                      className="w-12 h-12 rounded-full object-cover"
                    />
                  ) : (
                    <div
                      className="w-12 h-12 rounded-full flex items-center justify-center text-white text-sm font-semibold"
                      style={{ backgroundColor: avatarColor }}
                    >
                      {displayInitial}
                    </div>
                  )}
                  <div>
                    <div className="text-sm font-semibold text-foreground">
                      {agent?.username || "用户"}
                    </div>
                    <div className="text-xs text-muted-foreground">
                      {agent?.role === "admin" ? "管理员" : "客服"}
                    </div>
                  </div>
                </div>
              </div>

              <div className="p-2">
                <Button
                  variant="ghost"
                  size="sm"
                  className="w-full justify-start"
                  onClick={() => {
                    setProfileMenuOpen(false);
                    onProfileClick?.();
                  }}
                >
                  <svg
                    className="w-4 h-4 mr-2"
                    fill="none"
                    stroke="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path
                      strokeLinecap="round"
                      strokeLinejoin="round"
                      strokeWidth={2}
                      d="M16 7a4 4 0 11-8 0 4 4 0 018 0zM12 14a7 7 0 00-7 7h14a7 7 0 00-7-7z"
                    />
                  </svg>
                  {t("agent.profile")}
                </Button>
                <Button
                  variant="ghost"
                  size="sm"
                  className="w-full justify-start text-red-600 hover:text-red-700 hover:bg-red-50"
                  onClick={() => {
                    setProfileMenuOpen(false);
                    onLogout?.();
                  }}
                >
                  <svg
                    className="w-4 h-4 mr-2"
                    fill="none"
                    stroke="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path
                      strokeLinecap="round"
                      strokeLinejoin="round"
                      strokeWidth={2}
                      d="M17 16l4-4m0 0l-4-4m4 4H7m6 4v1a3 3 0 01-3 3H6a3 3 0 01-3-3V7a3 3 0 013-3h4a3 3 0 013 3v1"
                    />
                  </svg>
                  {t("agent.logout")}
                </Button>
              </div>
            </div>
          )}
        </div>

          <Tooltip>
            <TooltipTrigger asChild>
              <Button
                variant="ghost"
                size="sm"
                asChild
                className="w-10 h-10 rounded-lg bg-white border border-gray-200 hover:bg-gray-100 transition-colors p-0"
              >
                <a
                  href={websiteConfig.github.repo}
                  target="_blank"
                  rel="noopener noreferrer"
                  aria-label="GitHub"
                >
                  <svg
                    className="w-5 h-5 text-gray-600"
                    fill="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path d="M12 0c-6.626 0-12 5.373-12 12 0 5.302 3.438 9.8 8.207 11.387.599.111.793-.261.793-.577v-2.234c-3.338.726-4.033-1.416-4.033-1.416-.546-1.387-1.333-1.756-1.333-1.756-1.089-.745.083-.729.083-.729 1.205.084 1.839 1.237 1.839 1.237 1.07 1.834 2.807 1.304 3.492.997.107-.775.418-1.305.762-1.604-2.665-.305-5.467-1.334-5.467-5.931 0-1.311.469-2.381 1.236-3.221-.124-.303-.535-1.524.117-3.176 0 0 1.008-.322 3.301 1.23.957-.266 1.983-.399 3.003-.404 1.02.005 2.047.138 3.006.404 2.291-1.552 3.297-1.23 3.297-1.23.653 1.653.242 2.874.118 3.176.77.84 1.235 1.911 1.235 3.221 0 4.609-2.807 5.624-5.479 5.921.43.372.823 1.102.823 2.222v3.293c0 .319.192.694.801.576 4.765-1.589 8.199-6.086 8.199-11.386 0-6.627-5.373-12-12-12z" />
                  </svg>
                </a>
              </Button>
            </TooltipTrigger>
            <TooltipContent side="right">GitHub</TooltipContent>
          </Tooltip>
        </div>
      </div>
    </TooltipProvider>
  );
}