import { useEffect, useState } from "react";
import { BarChart3, TrendingUp, Users, CheckCircle2 } from "lucide-react";
import { motion } from "motion/react";
import { getDashboardHome, type DashboardActivity, type DashboardHome, type DashboardStat, type DashboardTodo } from "@/lib/auth";

const DASHBOARD_PREVIEW_COUNT = 5;

const baseStats = [
  { name: "本月新增商机", metricKey: "monthlyOpportunities", icon: TrendingUp, color: "text-emerald-600 dark:text-emerald-400", bg: "bg-emerald-100 dark:bg-emerald-500/20" },
  { name: "跟进中客户", metricKey: "followingCustomers", icon: Users, color: "text-blue-600 dark:text-blue-400", bg: "bg-blue-100 dark:bg-blue-500/20" },
  { name: "已成单项目", metricKey: "wonProjects", icon: CheckCircle2, color: "text-violet-600 dark:text-violet-400", bg: "bg-violet-100 dark:bg-violet-500/20" },
  { name: "本月打卡天数", metricKey: "monthlyCheckins", icon: BarChart3, color: "text-amber-600 dark:text-amber-400", bg: "bg-amber-100 dark:bg-amber-500/20" },
] as const;

export default function Dashboard() {
  const [home, setHome] = useState<DashboardHome>({});
  const [showAllTodos, setShowAllTodos] = useState(false);
  const [showAllActivities, setShowAllActivities] = useState(false);

  useEffect(() => {
    let cancelled = false;

    async function loadDashboard() {
      try {
        const data = await getDashboardHome();
        if (!cancelled) {
          setHome(data ?? {});
        }
      } catch {
        if (!cancelled) {
          setHome({});
        }
      }
    }

    void loadDashboard();

    return () => {
      cancelled = true;
    };
  }, []);

  useEffect(() => {
    setShowAllTodos(false);
    setShowAllActivities(false);
  }, [home.todos, home.activities]);

  const statMap = new Map((home.stats ?? []).map((item: DashboardStat) => [item.metricKey, item.value]));
  const stats = baseStats.map((stat) => ({
    ...stat,
    value: statMap.get(stat.metricKey),
  }));
  const todos = (home.todos?.length ? home.todos : [{ id: 0, title: "无" }]) as DashboardTodo[];
  const activities = (home.activities?.length
    ? home.activities
    : [{ id: 0, title: "无", content: "无", timeText: "无" }]) as DashboardActivity[];
  const visibleTodos = showAllTodos ? todos : todos.slice(0, DASHBOARD_PREVIEW_COUNT);
  const visibleActivities = showAllActivities ? activities : activities.slice(0, DASHBOARD_PREVIEW_COUNT);
  const hasMoreTodos = todos.length > DASHBOARD_PREVIEW_COUNT && todos[0]?.id !== 0;
  const hasMoreActivities = activities.length > DASHBOARD_PREVIEW_COUNT && activities[0]?.id !== 0;

  return (
    <div className="space-y-6">
      <header>
        <h1 className="text-2xl font-bold tracking-tight text-slate-900 dark:text-white">工作台</h1>
        <p className="text-sm text-slate-500 dark:text-slate-400">
          欢迎回来，{home.realName || "无"}。今天是你入职的第 {home.onboardingDays ?? 0} 天。
        </p>
      </header>

      <div className="grid grid-cols-2 gap-4 md:grid-cols-4">
        {stats.map((stat, i) => (
          <motion.div
            key={stat.name}
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ delay: i * 0.1 }}
            className="rounded-2xl border border-slate-100 dark:border-slate-800 bg-white dark:bg-slate-900/50 p-5 shadow-sm backdrop-blur-sm transition-all hover:shadow-md dark:hover:bg-slate-900"
          >
            <div className="flex items-center gap-4">
              <div className={`flex h-12 w-12 items-center justify-center rounded-xl ${stat.bg}`}>
                <stat.icon className={`h-6 w-6 ${stat.color}`} />
              </div>
              <div>
                <p className="text-sm font-medium text-slate-500 dark:text-slate-400">{stat.name}</p>
                <p className="text-2xl font-bold text-slate-900 dark:text-white">{stat.value ?? 0}</p>
              </div>
            </div>
          </motion.div>
        ))}
      </div>

      <div className="grid gap-6 md:grid-cols-2">
        <motion.div
          initial={{ opacity: 0, y: 20 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ delay: 0.4 }}
          className="rounded-2xl border border-slate-100 dark:border-slate-800 bg-white dark:bg-slate-900/50 p-6 shadow-sm backdrop-blur-sm"
        >
          <h2 className="mb-4 text-lg font-semibold text-slate-900 dark:text-white">待办事项</h2>
          <ul className="space-y-3">
            {visibleTodos.map((task: DashboardTodo, i: number) => (
              <li key={task.id ?? i} className="group flex cursor-pointer items-center gap-3 rounded-xl border border-slate-50 dark:border-slate-800/50 p-3 transition-all hover:bg-slate-50 dark:hover:bg-slate-800">
                <div className="flex h-5 w-5 items-center justify-center rounded-full border-2 border-slate-300 dark:border-slate-600 group-hover:border-violet-500 dark:group-hover:border-violet-400 transition-colors" />
                <span className="text-sm text-slate-700 dark:text-slate-300 group-hover:text-slate-900 dark:group-hover:text-white transition-colors">{task.title || "无"}</span>
              </li>
            ))}
          </ul>
          {hasMoreTodos && !showAllTodos ? (
            <button
              type="button"
              onClick={() => setShowAllTodos(true)}
              className="mt-4 w-full rounded-xl border border-dashed border-slate-200 dark:border-slate-700 px-3 py-2 text-sm font-medium text-slate-500 transition-colors hover:border-violet-300 hover:text-violet-600 dark:text-slate-400 dark:hover:border-violet-700 dark:hover:text-violet-400"
            >
              ...
            </button>
          ) : null}
        </motion.div>

        <motion.div
          initial={{ opacity: 0, y: 20 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ delay: 0.5 }}
          className="rounded-2xl border border-slate-100 dark:border-slate-800 bg-white dark:bg-slate-900/50 p-6 shadow-sm backdrop-blur-sm"
        >
          <h2 className="mb-4 text-lg font-semibold text-slate-900 dark:text-white">最新动态</h2>
          <div className="space-y-5">
            {visibleActivities.map((news: DashboardActivity, i: number) => (
              <div key={news.id ?? i} className="flex gap-4">
                <div className="relative mt-1 flex h-3 w-3 items-center justify-center">
                  <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-violet-400 opacity-20"></span>
                  <span className="relative inline-flex h-2 w-2 rounded-full bg-violet-500"></span>
                </div>
                <div>
                  <p className="text-sm font-medium text-slate-900 dark:text-white">{news.title || "无"}</p>
                  <p className="text-xs text-slate-500 dark:text-slate-400 mt-0.5">{news.content || "无"}</p>
                  <p className="mt-1 text-[10px] text-slate-400 dark:text-slate-500">{news.timeText || "无"}</p>
                </div>
              </div>
            ))}
          </div>
          {hasMoreActivities && !showAllActivities ? (
            <button
              type="button"
              onClick={() => setShowAllActivities(true)}
              className="mt-4 w-full rounded-xl border border-dashed border-slate-200 dark:border-slate-700 px-3 py-2 text-sm font-medium text-slate-500 transition-colors hover:border-violet-300 hover:text-violet-600 dark:text-slate-400 dark:hover:border-violet-700 dark:hover:text-violet-400"
            >
              ...
            </button>
          ) : null}
        </motion.div>
      </div>
    </div>
  );
}