import { useEffect, useMemo, useState } from "react";
import {
  AudioOutlined,
  ArrowRightOutlined,
  VideoCameraOutlined,
  VideoCameraAddOutlined
} from "@ant-design/icons";
import { Button, Empty, Skeleton, Tag, Typography } from "antd";
import { useNavigate } from "react-router-dom";
import dayjs from "dayjs";
import { getRecentTasks } from "@/api/business/dashboard";
import type { MeetingVO } from "@/api/business/meeting";
import "./index.less";
import RightVisual from "./RightVisual";

const { Text, Title } = Typography;

type QuickEntry = {
  title: string;
  icon: React.ReactNode;
  description: string[];
  accent: string;
  badge: string;
  onClick: () => void;
};

type RecentCard = {
  id: number | string;
  title: string;
  duration: string;
  time: string;
  tags: string[];
};

const RECENT_CARD_READ_STORAGE_KEY = "home_recent_card_read_ids";

const fallbackRecentCards: RecentCard[] = [
  {
    id: "sample-1",
    title: "2026-03-25 16:05 记录",
    duration: "01:10",
    time: "今天 16:05",
    tags: ["发言人", "降噪", "速度", "模仿", "暂停"]
  },
  {
    id: "sample-2",
    title: "【示例】开会用通义听悟，高效又省心",
    duration: "02:14",
    time: "2026-03-24 11:04",
    tags: ["会议日程", "笔记", "发言人", "协同", "纪要"]
  },
  {
    id: "sample-3",
    title: "【示例】上课用通义听悟，学习效率 UPUP",
    duration: "02:01",
    time: "2026-03-23 11:04",
    tags: ["转写", "笔记", "学习", "教学音频", "课程音频"]
  }
];

function buildRecentCards(tasks: MeetingVO[]): RecentCard[] {
  if (!tasks.length) {
    return fallbackRecentCards;
  }

  return tasks.slice(0, 3).map((task, index) => ({
    id: task.id,
    title: task.title,
    duration: `0${index + 1}:${10 + index * 12}`,
    time: dayjs(task.meetingTime || task.createdAt).format("YYYY-MM-DD HH:mm"),
    tags: task.tags?.split(",").filter(Boolean).slice(0, 5) || []
  }));
}

export default function HomePage() {
  const navigate = useNavigate();
  const [recentTasks, setRecentTasks] = useState<MeetingVO[]>([]);
  const [loading, setLoading] = useState(true);
  const [readCardIds, setReadCardIds] = useState<string[]>(() => {
    if (typeof window === "undefined") {
      return [];
    }

    try {
      const rawValue = window.localStorage.getItem(RECENT_CARD_READ_STORAGE_KEY);
      if (!rawValue) {
        return [];
      }
      const parsed = JSON.parse(rawValue);
      return Array.isArray(parsed) ? parsed.map(String) : [];
    } catch {
      return [];
    }
  });

  const [wordIndex, setWordIndex] = useState(0);
  const ROTATING_WORDS = useMemo(() => ["都有迹可循", "都能被听见", "都值得记录", "都清晰可见"], []);

  useEffect(() => {
    const interval = setInterval(() => {
      setWordIndex((prev) => (prev + 1) % ROTATING_WORDS.length);
    }, 3000);
    return () => clearInterval(interval);
  }, [ROTATING_WORDS.length]);

  useEffect(() => {
    const fetchRecentTasks = async () => {
      try {
        const response = await getRecentTasks();
        const payload: any = (response as any).data || response;
        setRecentTasks(payload?.data || payload || []);
      } catch (error) {
        console.error("Home recent tasks load failed", error);
      } finally {
        setLoading(false);
      }
    };

    void fetchRecentTasks();
  }, []);

  useEffect(() => {
    if (typeof window === "undefined") {
      return;
    }

    window.localStorage.setItem(RECENT_CARD_READ_STORAGE_KEY, JSON.stringify(readCardIds));
  }, [readCardIds]);

  const quickEntries = useMemo<QuickEntry[]>(
    () => [
      {
        title: "开启实时记录",
        icon: <AudioOutlined />,
        description: ["实时语音转文字", "同步翻译，智能总结要点"],
        accent: "violet",
        badge: "会议神器",
        onClick: () => navigate("/meetings?action=create&type=realtime")
      },
      {
        title: "上传音视频",
        icon: <VideoCameraAddOutlined />,
        description: ["音视频转文字", "区分发言人，一键导出"],
        accent: "cyan",
        badge: "iMeeting",
        onClick: () => navigate("/meetings?create=true")
      }
    ],
    [navigate]
  );

  const recentCards = useMemo(() => buildRecentCards(recentTasks), [recentTasks]);

  const handleRecentCardClick = (card: RecentCard) => {
    const cardId = String(card.id);
    setReadCardIds((prev) => (prev.includes(cardId) ? prev : [...prev, cardId]));

    if (typeof card.id === "number") {
      navigate(`/meetings/${card.id}`);
    }
  };

  return (
    <main className="home-container">
      {/* Massive Abstract Background Sphere matching the design/img.png */}
      <div className="home-bg-visual" aria-hidden="true">
         <div className="home-bg-sphere" />
         <RightVisual />
      </div>

      <div className="home-content-wrapper">
        <header className="home-hero">
          <Title level={1} className="home-title">
            每一次交流，
            <span className="home-title-accent-wrapper">
              <span 
                className="home-title-accent-scroller" 
                style={{ transform: `translateY(-${wordIndex * 1.2}em)` }}
              >
                {ROTATING_WORDS.map((word) => (
                  <span key={word} className="home-title-accent">
                    {word}
                  </span>
                ))}
              </span>
            </span>
          </Title>
          
          <div className="home-quick-actions">
            {quickEntries.map((entry) => (
              <div 
                className={`home-action-item home-action-item--${entry.accent}`} 
                onClick={entry.onClick} 
                key={entry.title}
              >
                <div className="home-action-badge">{entry.badge}</div>
                <div className="home-action-icon-wrapper">
                  <div className="home-action-icon">{entry.icon}</div>
                  <div className="home-action-icon-glow" />
                  <div className="home-action-icon-circle" />
                </div>
                <Title level={3} className="home-action-title">{entry.title}</Title>
                <div className="home-action-desc">
                  {entry.description.map((line) => (
                    <Text key={line} className="home-action-line">
                      {line}
                    </Text>
                  ))}
                </div>
              </div>
            ))}
          </div>
        </header>

        <section className="home-recent-section">
          <div className="home-section-header">
            <Title level={3}>最近</Title>
            <Button type="link" onClick={() => navigate("/meetings")} className="home-view-all">
              查看全部 <ArrowRightOutlined />
            </Button>
          </div>

          {loading ? (
            <div className="home-recent-grid">
              {[...Array(3)].map((_, i) => (
                <div key={i} className="home-recent-skeleton">
                  <Skeleton active paragraph={{ rows: 2 }} title={{ width: "60%" }} />
                </div>
              ))}
            </div>
          ) : recentCards.length ? (
            <div className="home-recent-grid">
              {recentCards.map((card) => (
                <article
                  key={card.id}
                  className="home-recent-card"
                  onClick={() => handleRecentCardClick(card)}
                  onKeyDown={(event) => {
                    if (event.key === "Enter" || event.key === " ") {
                      event.preventDefault();
                      handleRecentCardClick(card);
                    }
                  }}
                  role="button"
                  tabIndex={0}
                >
                  {!readCardIds.includes(String(card.id)) && <span className="home-recent-card-dot" />}
                  <div className="home-recent-card-head">
                    <Title level={4} className="home-recent-card-title">{card.title}</Title>
                    <div className="home-recent-card-icon">
                      <VideoCameraOutlined className="home-recent-card-play-icon" />
                    </div>
                  </div>
                  <div className="home-recent-card-tags">
                    {card.tags.slice(0, 4).map((tag) => (
                      <Tag key={`${card.id}-${tag}`} className="home-recent-card-tag" bordered={false}>
                        {tag}
                      </Tag>
                    ))}
                  </div>
                  <div className="home-recent-card-footer">
                    <span className="home-recent-card-duration">{card.duration}</span>
                    <span className="home-recent-card-time">{card.time}</span>
                  </div>
                </article>
              ))}
            </div>
          ) : (
            <div className="home-empty-state">
              <Empty description="暂无最近记录" />
            </div>
          )}
        </section>
      </div>
    </main>
  );
}