'use client';

import { useEffect } from 'react';
import { usePathname, useRouter } from 'next/navigation';
import { Inbox, Package, FolderKanban, Tag, Users, LayoutGrid, Lightbulb, Clock, Shield, Settings, Sparkles, TriangleAlert, MessageCircleQuestionMark, Activity } from 'lucide-react';
import { useHasPermission } from '@/components/auth/Guard';
import { useXiaobaoWarningRisks } from '@/hooks/useXiaobaoWarningRisks';
import { useWorkspaceWorkItems } from '@/hooks/useWorkspaceWorkItems';
import { useAuthStore } from '@/stores/useAuthStore';
import { useMemberStore } from '@/stores/useMemberStore';
import { useXiaobaoRiskStore } from '@/stores/useXiaobaoRiskStore';
import { useXiaobaoWarningReadStore } from '@/stores/useXiaobaoWarningReadStore';
import { getWorkspacePendingCount } from '@/lib/workspace-engine';
import { buildXiaobaoRiskInsightPendingKey } from '@/lib/xiaobao-risk-suggestion';
import {
  filterXiaobaoRiskWarnings,
  getXiaobaoWarningRiskCount,
  getXiaobaoWarningUnreadUpdateCount,
} from '@/lib/xiaobao-warning-view';

type NavItemConfig = {
  label: string;
  path: string;
  icon: any;
  permission: string | null;
  badge?: 'xiaobao-risk' | 'workspace-pending';
};

const NAV_GROUPS = [
  {
    label: '工作区',
    items: [
      { label: 'AI 助手', path: '/wenfan-xiaobao', icon: MessageCircleQuestionMark, permission: null as string | null },
      { label: '智能预警', path: '/xiaobao-warning', icon: TriangleAlert, permission: 'xiaobao.warning:view', badge: 'xiaobao-risk' as const },
      { label: '与我相关', path: '/workspace', icon: Inbox, permission: null as string | null, badge: 'workspace-pending' as const },
      { label: '产品', path: '/products', icon: Package, permission: 'product:view' },
      { label: '项目', path: '/projects', icon: FolderKanban, permission: 'project:view' },
      { label: '版本', path: '/versions', icon: Tag, permission: 'version:view' },
      { label: '需求池', path: '/requirements', icon: Lightbulb, permission: 'requirement:view' },
      { label: '加班记录', path: '/overtime', icon: Clock, permission: 'overtime:view' },
    ],
  },
  {
    label: '管理',
    items: [
      { label: '成员', path: '/admin/members', icon: Users, permission: 'member:view' },
      { label: '角色', path: '/admin/roles', icon: Shield, permission: 'role:view' },
      { label: '运维', path: '/admin/ops', icon: Activity, permission: 'ops:view' },
      { label: 'AI 配置', path: '/admin/ai-config', icon: Sparkles, permission: '*' },
    ],
  },
];

export function Sidebar() {
  const pathname = usePathname();
  const router = useRouter();
  const { workItems } = useWorkspaceWorkItems();
  const workspacePendingCount = getWorkspacePendingCount(workItems);

  const isActive = (path: string) =>
    pathname === path || (path !== '/' && pathname.startsWith(path));

  return (
    <aside className="flex h-screen w-64 flex-col border-r border-[var(--line)] bg-[var(--bg-card)]">
      <div className="border-b border-[var(--line)] px-4 py-4">
        <div className="flex items-center gap-3">
          <div className="flex h-9 w-9 shrink-0 items-center justify-center rounded-lg bg-zinc-950 shadow-sm">
            <LayoutGrid className="h-4 w-4 text-white" strokeWidth={2.25} />
          </div>
          <div className="min-w-0">
            <p className="truncate text-[14px] font-semibold text-[var(--ink)]">FTB</p>
            <p className="truncate text-[11px] text-[var(--ink-muted)]">项目管理</p>
          </div>
        </div>
      </div>

      <nav className="flex-1 overflow-y-auto px-3 py-3">
        {NAV_GROUPS.map((group) => (
          <NavGroup
            key={group.label}
            label={group.label}
            items={group.items}
            isActive={isActive}
            onNavigate={(p) => router.push(p)}
            workspacePendingCount={workspacePendingCount}
          />
        ))}
      </nav>

      <div className="border-t border-[var(--line)] p-3">
        <UserBlock />
      </div>
    </aside>
  );
}

function UserBlock() {
  const router = useRouter();
  const user = useAuthStore((s) => s.user);
  const role = useMemberStore((s) => s.roles.find((r) => r.id === user?.roleId));

  if (!user) {
    return (
      <div className="flex w-full items-center gap-2.5 rounded-lg border border-[var(--line)] bg-[var(--bg-subtle)] px-2.5 py-2 text-left">
        <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-[var(--bg-card)] text-[11px] font-semibold text-[var(--ink-muted)]">?</div>
        <p className="truncate text-[13px] text-[var(--ink-muted)]">未登录</p>
      </div>
    );
  }

  return (
    <div className="flex w-full items-center gap-2.5 rounded-lg border border-[var(--line)] bg-[var(--bg-subtle)] px-2.5 py-2">
      <div className="flex h-8 w-8 shrink-0 items-center justify-center rounded-full bg-[var(--accent)] text-[11px] font-semibold text-white">
        {user.name?.[0] ?? '?'}
      </div>
      <div className="min-w-0 flex-1">
        <p className="truncate text-[13px] font-medium text-[var(--ink)]">{user.name}</p>
        <p className="truncate text-[11px] text-[var(--ink-muted)]">{role?.name ?? '-'}</p>
      </div>
      <button
        onClick={() => router.push('/profile')}
        className="rounded-md p-1 text-[var(--ink-muted)] hover:bg-[var(--bg-card)] hover:text-[var(--accent)]"
        title="个人中心"
      >
        <Settings className="h-4 w-4" strokeWidth={1.75} />
      </button>
    </div>
  );
}

function NavGroup({ label, items, isActive, onNavigate, workspacePendingCount }: {
  label: string;
  items: NavItemConfig[];
  isActive: (p: string) => boolean;
  onNavigate: (p: string) => void;
  workspacePendingCount: number;
}) {
  const visibleItems = items.filter((item) => item.permission === null || /* eslint-disable-next-line react-hooks/rules-of-hooks */ true);
  if (visibleItems.length === 0) return null;
  return (
    <div className="mb-5">
      <p className="mb-2 px-2 text-[11px] font-semibold text-[var(--ink-muted)]">{label}</p>
      <div className="space-y-1">
        {items.map((item) => (
          <NavItem
            key={item.path}
            item={item}
            active={isActive(item.path)}
            onNavigate={onNavigate}
            workspacePendingCount={workspacePendingCount}
          />
        ))}
      </div>
    </div>
  );
}

function NavItem({ item, active, onNavigate, workspacePendingCount }: {
  item: NavItemConfig;
  active: boolean;
  onNavigate: (p: string) => void;
  workspacePendingCount: number;
}) {
  const hasPerm = useHasPermission(item.permission ?? '');
  if (item.permission && !hasPerm) return null;
  const Icon = item.icon;
  return (
    <button
      onClick={() => onNavigate(item.path)}
      className={`group relative flex h-9 w-full items-center gap-2.5 rounded-md px-2.5 text-left text-[13px] transition-colors ${
        active
          ? 'bg-[var(--bg)] font-medium text-[var(--ink)] shadow-sm ring-1 ring-[var(--line)]'
          : 'text-[var(--ink-soft)] hover:bg-[var(--bg-subtle)] hover:text-[var(--ink)]'
      }`}
    >
      {active && <span className="absolute left-0 top-1/2 h-5 w-0.5 -translate-y-1/2 rounded-full bg-[var(--accent)]" />}
      <span className={`flex h-6 w-6 shrink-0 items-center justify-center rounded-md ${
        active
          ? 'bg-[var(--accent)] text-white'
          : 'text-[var(--ink-muted)] group-hover:bg-[var(--bg-card)] group-hover:text-[var(--ink)]'
      }`}>
        <Icon className="h-3.5 w-3.5" strokeWidth={1.9} />
      </span>
      <span className="min-w-0 flex-1 truncate">{item.label}</span>
      {item.badge === 'xiaobao-risk' && <XiaobaoRiskNavBadge />}
      {item.badge === 'workspace-pending' && <NavCountBadge count={workspacePendingCount} />}
    </button>
  );
}

function XiaobaoRiskNavBadge() {
  const { risks } = useXiaobaoWarningRisks();
  const user = useAuthStore((s) => s.user);
  const pendingInsightKeys = useXiaobaoRiskStore((s) => s.pendingInsightKeys);
  const { readStates, readStateLoaded, fetchReadStates } = useXiaobaoWarningReadStore();
  useEffect(() => {
    if (user?.id) fetchReadStates();
  }, [fetchReadStates, user?.id]);

  const count = getXiaobaoWarningRiskCount(risks);
  if (count <= 0) return null;

  const warningRisks = filterXiaobaoRiskWarnings(risks).map((risk) => (
    pendingInsightKeys.includes(buildXiaobaoRiskInsightPendingKey(risk))
      ? { ...risk, aiInsightUpdating: true }
      : risk
  ));
  const unreadUpdateCount = readStateLoaded ? getXiaobaoWarningUnreadUpdateCount(warningRisks, readStates, user?.id) : 0;
  return <NavCountBadge count={count} tone={unreadUpdateCount > 0 ? 'update' : 'risk'} />;
}

function NavCountBadge({ count, tone = 'risk' }: { count: number; tone?: 'risk' | 'update' }) {
  if (count <= 0) return null;
  const toneClass = tone === 'update' ? 'bg-blue-600' : 'bg-red-600';

  return (
    <span className={`ml-auto inline-flex h-5 min-w-5 shrink-0 items-center justify-center rounded-full px-1.5 text-[10px] font-semibold leading-none text-white ${toneClass}`}>
      {count > 99 ? '99+' : count}
    </span>
  );
}