"use client";

import Link from "next/link";
import { usePathname, useRouter } from "next/navigation";

import { LogoButton } from "@/components/easter-egg/LogoButton";
import {
  AdminIcon,
  ArchiveIcon,
  MemoryIcon,
  ChatIcon,
  CharacterIcon,
  ModelIcon,
  SettingsIcon,
  ToolsIcon,
  WorldIcon,
} from "@/components/ui/Icons";
import { Badge } from "@/components/ui/Badge";
import { FEATURE_FLAGS } from "@/lib/config";
import { useAuthStore } from "@/lib/stores/auth-store";
import {
  NEXT_THEME_LABEL,
  useSettingsStore,
} from "@/lib/stores/settings-store";
import { cn } from "@/lib/utils/cn";
import type { ReactNode } from "react";

interface NavItem {
  href: string;
  label: string;
  icon: ReactNode;
  enabled?: boolean;
}

interface NavGroup {
  title: string;
  items: NavItem[];
}

/**
 * 主导航分组：灵台（镜树）、法身（灵胚/人物）、内景（世界）、
 * 藏识（记忆/归档）、百工（工具/神识阁/设置）。
 * 旧人格/内驱力/五行/灵枢/轨迹页随 M6 退役（人格=道体锚点+缘契，轨迹并入镜树）。
 */
const NAV_GROUPS: NavGroup[] = [
  {
    title: "灵台",
    items: [{ href: "/trees", label: "镜树", icon: <ChatIcon /> }],
  },
  {
    title: "法身",
    items: [
      { href: "/embryos", label: "灵胚", icon: <CharacterIcon /> },
      { href: "/characters", label: "人物", icon: <CharacterIcon /> },
    ],
  },
  {
    title: "内景",
    items: [
      {
        href: "/world",
        label: "世界",
        icon: <WorldIcon />,
        enabled: FEATURE_FLAGS.worldPanel,
      },
    ],
  },
  {
    title: "藏识",
    items: [
      { href: "/memories", label: "记忆", icon: <MemoryIcon /> },
      { href: "/archive", label: "归档", icon: <ArchiveIcon /> },
    ],
  },
  {
    title: "百工",
    items: [
      { href: "/tools", label: "工具", icon: <ToolsIcon /> },
      { href: "/models", label: "神识阁", icon: <ModelIcon /> },
      { href: "/settings", label: "设置", icon: <SettingsIcon /> },
    ],
  },
];

export function Sidebar({
  expanded = true,
  onToggleFold,
  onNavigate,
}: {
  expanded?: boolean;
  onToggleFold?: () => void;
  onNavigate?: () => void;
}) {
  const pathname = usePathname();
  const router = useRouter();
  const theme = useSettingsStore((s) => s.theme);
  const toggleTheme = useSettingsStore((s) => s.toggleTheme);
  const user = useAuthStore((s) => s.user);
  const logout = useAuthStore((s) => s.logout);

  const handleLogout = () => {
    logout();
    router.push("/login");
  };

  return (
    <div
      className={cn(
        "flex h-full w-full flex-col pt-3 transition-[padding] duration-200",
        expanded ? "px-3" : "px-0",
      )}
    >
      {/* 品牌 + 折叠钮：窄态居中、宽态两端对齐（设计稿 sidebar-topbar 同源） */}
      <div
        className={cn(
          "flex items-center gap-1 py-2",
          expanded ? "justify-between px-1" : "justify-center px-0",
        )}
      >
        <LogoButton compact={!expanded} />
        {onToggleFold && (
          <button
            type="button"
            onClick={onToggleFold}
            aria-label={expanded ? "收起侧栏" : "展开侧栏"}
            title={expanded ? "收起侧栏" : "展开侧栏"}
            className="flex h-11 w-11 items-center justify-center rounded-lg text-muted transition-colors hover:bg-overlay-hover hover:text-fg"
          >
            <FoldIcon />
          </button>
        )}
      </div>

      {/* 分组导航 */}
      <nav className={cn("mt-3 flex flex-col", expanded ? "gap-4" : "gap-3")}>
        {NAV_GROUPS.map((group) => {
          const visible = group.items.filter((i) => i.enabled !== false);
          if (visible.length === 0) return null;
          return (
            <div key={group.title}>
              {expanded && (
                <p className="mb-1 px-3 text-[10px] font-medium uppercase tracking-[0.15em] text-muted/60">
                  {group.title}
                </p>
              )}
              <div
                className={cn("flex flex-col", expanded ? "gap-0.5" : "gap-1")}
              >
                {visible.map((item) => {
                  const active =
                    pathname === item.href ||
                    pathname.startsWith(`${item.href}/`);
                  return (
                    <Link
                      key={item.href}
                      href={item.href}
                      onClick={onNavigate}
                      aria-current={active ? "page" : undefined}
                      title={expanded ? undefined : item.label}
                      className={cn(
                        "flex items-center rounded-[10px] font-medium transition-all duration-200",
                        expanded
                          ? "gap-2.5 px-3 py-2 text-sm"
                          : "justify-center px-0 py-2",
                        active
                          ? "bg-patina-wash text-patina"
                          : "text-muted hover:bg-overlay-hover hover:text-fg",
                      )}
                    >
                      <span className="shrink-0 opacity-70">{item.icon}</span>
                      {expanded && item.label}
                    </Link>
                  );
                })}
              </div>
            </div>
          );
        })}
      </nav>

      {/* 底部：用户卡片常驻 + 管理入口 */}
      <div className="mt-auto border-t border-border-glass pt-3 pb-1">
        {user && (
          <div
            className={cn(
              "mb-2 flex items-center rounded-xl",
              expanded ? "gap-2.5 px-3 py-2" : "justify-center px-0 py-2",
            )}
          >
            <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-patina text-xs font-medium text-ink">
              {user.username.charAt(0).toUpperCase()}
            </div>
            {expanded && (
              <div className="min-w-0 flex-1">
                <p className="truncate text-sm font-medium text-fg">
                  {user.username}
                </p>
                <p className="truncate text-[11px] text-muted">
                  {user.is_admin ? "管理员" : user.email}
                </p>
              </div>
            )}
          </div>
        )}

        {user?.is_admin && FEATURE_FLAGS.adminPanel && (
          <Link
            href="/admin"
            onClick={onNavigate}
            aria-current={pathname.startsWith("/admin") ? "page" : undefined}
            title={expanded ? undefined : "司命台"}
            className={cn(
              "flex items-center rounded-[10px] font-medium transition-all duration-200",
              expanded
                ? "gap-2.5 px-3 py-2 text-sm"
                : "justify-center px-0 py-2",
              pathname.startsWith("/admin")
                ? "bg-patina-wash text-patina"
                : "text-muted hover:bg-overlay-hover hover:text-fg",
            )}
          >
            <span className="shrink-0 text-cinnabar opacity-90">
              <AdminIcon />
            </span>
            {expanded && "司命台"}
            {expanded && (
              <Badge tone="accent" className="ml-auto text-[10px]">
                管理
              </Badge>
            )}
          </Link>
        )}

        <button
          type="button"
          onClick={toggleTheme}
          title={expanded ? undefined : NEXT_THEME_LABEL[theme]}
          className={cn(
            "mt-1 flex items-center rounded-[10px] font-medium transition-all duration-200",
            expanded
              ? "w-full gap-2.5 px-3 py-2 text-xs"
              : "mx-auto justify-center px-0 py-2",
            "text-muted hover:bg-overlay-hover hover:text-fg",
          )}
        >
          <svg
            width="14"
            height="14"
            viewBox="0 0 16 16"
            fill="none"
            aria-hidden
          >
            <circle
              cx="8"
              cy="8"
              r="3"
              stroke="currentColor"
              strokeWidth="1.3"
            />
            <path
              d="M8 1v2M8 13v2M2 8h2M12 8h2M3.5 3.5l1.5 1.5M11 11l1.5 1.5M3.5 12.5l1.5-1.5M11 5l1.5-1.5"
              stroke="currentColor"
              strokeWidth="1.3"
              strokeLinecap="round"
            />
          </svg>
          {expanded && NEXT_THEME_LABEL[theme]}
        </button>

        <button
          type="button"
          onClick={handleLogout}
          title={expanded ? undefined : "退出登录"}
          className={cn(
            "mt-0.5 flex items-center rounded-[10px] font-medium transition-all duration-200",
            expanded
              ? "w-full gap-2.5 px-3 py-2 text-xs"
              : "mx-auto justify-center px-0 py-2",
            "text-muted hover:bg-overlay-hover hover:text-cinnabar",
          )}
        >
          <svg
            width="14"
            height="14"
            viewBox="0 0 16 16"
            fill="none"
            aria-hidden
          >
            <path
              d="M6 2H3a1 1 0 00-1 1v10a1 1 0 001 1h3M11 11l3-3-3-3M14 8H6"
              stroke="currentColor"
              strokeWidth="1.3"
              strokeLinecap="round"
              strokeLinejoin="round"
            />
          </svg>
          {expanded && "退出登录"}
        </button>
      </div>
    </div>
  );
}

/** 侧栏折叠钮图标：面板 + 左竖线（设计稿 sidebar-foldbtn 同源） */
function FoldIcon() {
  return (
    <svg width="18" height="18" viewBox="0 0 24 24" fill="none" aria-hidden>
      <rect
        x="3"
        y="4"
        width="18"
        height="16"
        rx="2"
        stroke="currentColor"
        strokeWidth="1.6"
      />
      <path
        d="M9 4v16"
        stroke="currentColor"
        strokeWidth="1.6"
        strokeLinecap="round"
      />
    </svg>
  );
}