import { useState, useEffect, useCallback, useRef } from 'react';
import { useNavigate } from 'react-router-dom';
import { useAuthStore } from '../store/auth';
import { AuroraCanvas } from '../components/AuroraCanvas';
import { LoginModal } from '../components/LoginModal';
import { ForceChangePasswordModal } from '../components/ForceChangePasswordModal';
import logoImg from '../assets/logo_512.png';
import styles from './LandingPage.module.css';

interface Props {
  autoLogin?: boolean;
}

export function LandingPage({ autoLogin }: Props) {
  const navigate = useNavigate();
  const isAuthenticated = useAuthStore((s) => s.isAuthenticated);
  const mustChangePassword = useAuthStore((s) => s.mustChangePassword);
  const [showLogin, setShowLogin] = useState(false);
  const [showForceChange, setShowForceChange] = useState(false);
  const [showSpark, setShowSpark] = useState(false);
  const [playing, setPlaying] = useState(false);
  const audioRef = useRef<HTMLAudioElement | null>(null);
  const [barHeights, setBarHeights] = useState([0.4, 0.4, 0.4, 0.4]);

  // Auto-open login modal when rendered via /login route
  useEffect(() => {
    if (autoLogin && !isAuthenticated) {
      setShowLogin(true);
    }
  }, [autoLogin, isAuthenticated]);

  // Auto-show force change password modal if authenticated but must change
  useEffect(() => {
    if (isAuthenticated && mustChangePassword) {
      setShowForceChange(true);
    }
  }, [isAuthenticated, mustChangePassword]);

  const handleAirDrama = () => {
    if (isAuthenticated) {
      if (mustChangePassword) {
        setShowForceChange(true);
      } else {
        navigate('/app');
      }
    } else {
      setShowLogin(true);
    }
  };

  const handleAirSpark = () => {
    setShowSpark(true);
  };

  const handleLoginSuccess = () => {
    setShowLogin(false);
    if (mustChangePassword) {
      setShowForceChange(true);
    } else {
      navigate('/app', { replace: true });
    }
  };

  const handleForceChangeSuccess = () => {
    setShowForceChange(false);
    navigate('/app', { replace: true });
  };

  // Close spark overlay on click
  const closeSpark = useCallback(() => setShowSpark(false), []);

  // Animate bar heights when playing
  useEffect(() => {
    if (!playing) {
      setBarHeights([0.4, 0.4, 0.4, 0.4]);
      return;
    }
    const id = setInterval(() => {
      setBarHeights([
        0.3 + Math.random() * 0.7,
        0.3 + Math.random() * 0.7,
        0.3 + Math.random() * 0.7,
        0.3 + Math.random() * 0.7,
      ]);
    }, 150);
    return () => clearInterval(id);
  }, [playing]);

  // Stop music on unmount (e.g. navigating to /app after login)
  useEffect(() => {
    return () => {
      if (audioRef.current) {
        audioRef.current.pause();
        audioRef.current.currentTime = 0;
      }
    };
  }, []);

  // Music toggle
  const toggleMusic = useCallback(() => {
    if (!audioRef.current) {
      audioRef.current = new Audio('/bgm.mp3');
      audioRef.current.loop = true;
    }
    if (playing) {
      audioRef.current.pause();
    } else {
      audioRef.current.play();
    }
    setPlaying((p) => !p);
  }, [playing]);

  return (
    // V2: 跟随全局主题切换。LandingPage 浅色化 = AuroraCanvas + LoginModal 都跟随。
    // 薄荷绿在浅色下加深为 teal (#0d9488),保证对比度。
    <div className={styles.page}>
      {/* Layer 1-4: Aurora background */}
      <AuroraCanvas />

      {/* Layer 5: Content */}
      <div className={styles.content}>
        <img src={logoImg} alt="AirDrama" className={styles.logo} />

        <h1 className={styles.title}>AIRFLOW STUDIO</h1>
        <p className={styles.tagline}>AI VISUAL NARRATIVE</p>

        <div className={styles.actions}>
          <div className={styles.btnGroup}>
            <button className={styles.btnPrimary} onClick={handleAirDrama}>
              <span className={styles.btnName}>Air Drama</span>
            </button>
            <span className={styles.btnSub}>逐帧造梦</span>
          </div>
          <div className={styles.btnGroup}>
            <button className={styles.btnGhost} onClick={handleAirSpark}>
              <span className={styles.btnName}>Air Spark</span>
            </button>
            <span className={styles.btnSubGhost}>灵感自燃</span>
          </div>
        </div>
      </div>

      {/* Easter egg */}
      <p className={styles.easter}>Every frame was once just air.</p>

      {/* Air Spark full-screen overlay */}
      {showSpark && (
        <div className={styles.sparkOverlay} onClick={closeSpark}>
          <div className={styles.sparkContent}>
            <p className={styles.sparkTitle}>别急，土豆<span className={styles.sparkEmoji}>🥔</span>正在 coding 中</p>
            <p className={styles.sparkSub}>灵感自燃功能即将上线</p>
          </div>
        </div>
      )}

      {/* Music easter egg — bottom right */}
      <button
        className={styles.musicBtn}
        onClick={toggleMusic}
        aria-label={playing ? '暂停音乐' : '播放音乐'}
      >
        <svg width="20" height="18" viewBox="0 0 20 18" fill="none">
          {[0, 1, 2, 3].map((i) => {
            const maxH = 16;
            const h = maxH * barHeights[i];
            const y = 9 - h / 2; // center at y=9
            return (
              <rect
                key={i}
                x={1 + i * 5}
                y={y}
                width="3"
                height={h}
                rx="1.5"
                fill="currentColor"
                style={{ transition: 'y 0.15s ease, height 0.15s ease' }}
              />
            );
          })}
        </svg>
      </button>

      {/* Login modal */}
      <LoginModal
        isOpen={showLogin}
        onClose={() => setShowLogin(false)}
        onSuccess={handleLoginSuccess}
      />

      {/* Force change password modal (unclosable) */}
      {showForceChange && (
        <ForceChangePasswordModal onSuccess={handleForceChangeSuccess} />
      )}
    </div>
  );
}
