// ========================================
// Portfolio 페이지 전용 JavaScript
// ========================================

document.addEventListener('DOMContentLoaded', function() {
    initVideoLazyLoading();
    initPortfolioAnimations();
    initVideoInteractions();
    initYouTubeAPI();
});

// 비디오 레이지 로딩 초기화
function initVideoLazyLoading() {
    const videoWrappers = document.querySelectorAll('.video-wrapper');
    
    // Intersection Observer를 사용한 레이지 로딩
    const observerOptions = {
        threshold: 0.1,
        rootMargin: '50px 0px'
    };
    
    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                loadVideo(entry.target);
                observer.unobserve(entry.target);
            }
        });
    }, observerOptions);
    
    videoWrappers.forEach(wrapper => {
        observer.observe(wrapper);
        
        // 로딩 상태 표시
        if (!wrapper.querySelector('.video-loading')) {
            const loadingDiv = document.createElement('div');
            loadingDiv.className = 'video-loading';
            loadingDiv.textContent = '비디오 로딩 중...';
            wrapper.appendChild(loadingDiv);
        }
    });
}

// 비디오 로딩
function loadVideo(wrapper) {
    const iframe = wrapper.querySelector('iframe');
    if (iframe && iframe.dataset.src) {
        // 실제 src 설정
        iframe.src = iframe.dataset.src;
        
        // 로딩 완료 처리
        iframe.addEventListener('load', function() {
            wrapper.classList.add('loaded');
            const loadingDiv = wrapper.querySelector('.video-loading');
            if (loadingDiv) {
                loadingDiv.remove();
            }
        });
        
        // 에러 처리
        iframe.addEventListener('error', function() {
            const loadingDiv = wrapper.querySelector('.video-loading');
            if (loadingDiv) {
                loadingDiv.textContent = '비디오를 로드할 수 없습니다';
                loadingDiv.style.color = '#ef4444';
            }
        });
    } else {
        // 이미 src가 설정된 경우
        wrapper.classList.add('loaded');
        const loadingDiv = wrapper.querySelector('.video-loading');
        if (loadingDiv) {
            loadingDiv.remove();
        }
    }
}

// 포트폴리오 애니메이션 초기화
function initPortfolioAnimations() {
    // 비디오 카드 애니메이션
    const videoCards = document.querySelectorAll('.video-card');
    const observerOptions = {
        threshold: 0.1,
        rootMargin: '30px 0px'
    };
    
    const cardObserver = new IntersectionObserver((entries) => {
        entries.forEach((entry, index) => {
            if (entry.isIntersecting) {
                setTimeout(() => {
                    entry.target.style.opacity = '1';
                    entry.target.style.transform = 'translateY(0)';
                }, index * 150);
                cardObserver.unobserve(entry.target);
            }
        });
    }, observerOptions);
    
    videoCards.forEach(card => {
        card.style.opacity = '0';
        card.style.transform = 'translateY(30px)';
        card.style.transition = 'all 0.6s cubic-bezier(0.4, 0, 0.2, 1)';
        cardObserver.observe(card);
    });
    
    // 기술 특징 애니메이션
    const techFeatures = document.querySelectorAll('.tech-feature');
    techFeatures.forEach((feature, index) => {
        feature.style.opacity = '0';
        feature.style.transform = 'translateY(30px)';
        feature.style.transition = 'all 0.6s ease';
        
        setTimeout(() => {
            feature.style.opacity = '1';
            feature.style.transform = 'translateY(0)';
        }, 200 * (index + 1));
    });
    
    // YouTube 채널 카드 애니메이션
    const channelCard = document.querySelector('.youtube-channel-card');
    if (channelCard) {
        channelCard.style.opacity = '0';
        channelCard.style.transform = 'scale(0.95)';
        channelCard.style.transition = 'all 0.8s ease';
        
        setTimeout(() => {
            channelCard.style.opacity = '1';
            channelCard.style.transform = 'scale(1)';
        }, 300);
    }
}

// 비디오 상호작용 초기화
function initVideoInteractions() {
    const videoCards = document.querySelectorAll('.video-card');
    
    videoCards.forEach(card => {
        const iframe = card.querySelector('iframe');
        const videoInfo = card.querySelector('.video-info');
        
        // 카드 호버 효과
        card.addEventListener('mouseenter', function() {
            if (videoInfo) {
                videoInfo.style.transform = 'translateY(-5px)';
                videoInfo.style.transition = 'transform 0.3s ease';
            }
        });
        
        card.addEventListener('mouseleave', function() {
            if (videoInfo) {
                videoInfo.style.transform = 'translateY(0)';
            }
        });
        
        // 비디오 클릭 시 전체화면 효과
        if (iframe) {
            iframe.addEventListener('click', function() {
                this.style.transform = 'scale(1.02)';
                setTimeout(() => {
                    this.style.transform = 'scale(1)';
                }, 200);
            });
        }
    });
    
    // 태그 클릭 기능
    const tags = document.querySelectorAll('.tag');
    tags.forEach(tag => {
        tag.addEventListener('click', function() {
            const tagName = this.textContent.toLowerCase();
            filterByTag(tagName);
        });
        
        // 호버 효과
        tag.addEventListener('mouseenter', function() {
            this.style.transform = 'scale(1.1)';
            this.style.cursor = 'pointer';
        });
        
        tag.addEventListener('mouseleave', function() {
            this.style.transform = 'scale(1)';
        });
    });
}

// 태그별 필터링
function filterByTag(tagName) {
    const videoCards = document.querySelectorAll('.video-card');
    
    videoCards.forEach(card => {
        const tags = card.querySelectorAll('.tag');
        const hasTag = Array.from(tags).some(tag => 
            tag.textContent.toLowerCase().includes(tagName)
        );
        
        if (hasTag) {
            card.style.display = 'block';
            card.style.animation = 'fadeIn 0.5s ease';
        } else {
            card.style.opacity = '0.3';
            card.style.animation = 'fadeOut 0.5s ease';
        }
    });
    
    // 3초 후 필터 해제
    setTimeout(() => {
        videoCards.forEach(card => {
            card.style.display = 'block';
            card.style.opacity = '1';
            card.style.animation = 'fadeIn 0.5s ease';
        });
    }, 3000);
}

// YouTube API 초기화
function initYouTubeAPI() {
    // YouTube IFrame API 로드
    if (!window.YT) {
        const tag = document.createElement('script');
        tag.src = 'https://www.youtube.com/iframe_api';
        const firstScriptTag = document.getElementsByTagName('script')[0];
        firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
    }
    
    // API 준비 완료 시 실행
    window.onYouTubeIframeAPIReady = function() {
        initYouTubePlayers();
    };
}

// YouTube 플레이어 초기화
function initYouTubePlayers() {
    const youtubeIframes = document.querySelectorAll('iframe[src*="youtube.com"]');
    const players = [];
    
    youtubeIframes.forEach((iframe, index) => {
        const videoId = extractVideoId(iframe.src);
        if (videoId) {
            // 기존 iframe 교체
            const playerDiv = document.createElement('div');
            playerDiv.id = `youtube-player-${index}`;
            iframe.parentNode.replaceChild(playerDiv, iframe);
            
            // YouTube 플레이어 생성
            const player = new YT.Player(playerDiv.id, {
                height: '100%',
                width: '100%',
                videoId: videoId,
                playerVars: {
                    modestbranding: 1,
                    rel: 0,
                    showinfo: 0,
                    controls: 1,
                    autoplay: 0
                },
                events: {
                    onReady: onPlayerReady,
                    onStateChange: onPlayerStateChange,
                    onError: onPlayerError
                }
            });
            
            players.push(player);
        }
    });
    
    return players;
}

// YouTube 비디오 ID 추출
function extractVideoId(url) {
    const match = url.match(/embed\/([^?&]+)/);
    return match ? match[1] : null;
}

// 플레이어 준비 완료
function onPlayerReady(event) {
    console.log('YouTube player ready');
    
    // 플레이어 컨테이너에 로딩 완료 클래스 추가
    const playerElement = event.target.getIframe();
    const wrapper = playerElement.closest('.video-wrapper');
    if (wrapper) {
        wrapper.classList.add('loaded');
        const loadingDiv = wrapper.querySelector('.video-loading');
        if (loadingDiv) {
            loadingDiv.remove();
        }
    }
}

// 플레이어 상태 변경
function onPlayerStateChange(event) {
    const playerElement = event.target.getIframe();
    const videoCard = playerElement.closest('.video-card');
    
    if (event.data === YT.PlayerState.PLAYING) {
        // 재생 시작 시 다른 비디오 일시정지
        pauseOtherVideos(event.target);
        
        // 재생 중 표시
        if (videoCard) {
            videoCard.classList.add('playing');
        }
        
        // 재생 추적 (선택사항)
        trackVideoPlay(event.target);
        
    } else if (event.data === YT.PlayerState.PAUSED || event.data === YT.PlayerState.ENDED) {
        // 일시정지/종료 시
        if (videoCard) {
            videoCard.classList.remove('playing');
        }
    }
}

// 플레이어 오류 처리
function onPlayerError(event) {
    console.error('YouTube player error:', event.data);
    const playerElement = event.target.getIframe();
    const wrapper = playerElement.closest('.video-wrapper');
    
    if (wrapper) {
        const errorDiv = document.createElement('div');
        errorDiv.className = 'video-error';
        errorDiv.innerHTML = '비디오를 로드할 수 없습니다<br><small>네트워크 연결을 확인해주세요</small>';
        errorDiv.style.cssText = `
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            text-align: center;
            color: #ef4444;
            font-size: 1rem;
            z-index: 10;
        `;
        wrapper.appendChild(errorDiv);
    }
}

// 다른 비디오 일시정지
function pauseOtherVideos(currentPlayer) {
    if (window.youtubePlayers) {
        window.youtubePlayers.forEach(player => {
            if (player !== currentPlayer && player.pauseVideo) {
                player.pauseVideo();
            }
        });
    }
}

// 비디오 재생 추적
function trackVideoPlay(player) {
    if (typeof gtag !== 'undefined') {
        const videoTitle = player.getVideoData().title;
        gtag('event', 'video_play', {
            event_category: 'Portfolio',
            event_label: videoTitle,
            value: 1
        });
    }
}

// 비디오 공유 기능
function shareVideo(videoUrl, title) {
    if (navigator.share) {
        navigator.share({
            title: title || '밍글 스튜디오 포트폴리오',
            url: videoUrl
        });
    } else {
        // 클립보드에 복사
        navigator.clipboard.writeText(videoUrl).then(() => {
            showNotification('비디오 링크가 클립보드에 복사되었습니다.', 'success');
        });
    }
}

// 포트폴리오 통계
function getPortfolioStats() {
    const longformVideos = document.querySelectorAll('.longform-grid .video-card').length;
    const shortsVideos = document.querySelectorAll('.shorts-grid .video-card').length;
    const broadcastVideos = document.querySelectorAll('.broadcast-grid .video-card').length;
    
    return {
        longform: longformVideos,
        shorts: shortsVideos,
        broadcasts: broadcastVideos,
        total: longformVideos + shortsVideos + broadcastVideos
    };
}

// 알림 메시지 표시
function showNotification(message, type = 'info') {
    const existingNotification = document.querySelector('.notification');
    if (existingNotification) {
        existingNotification.remove();
    }
    
    const notification = document.createElement('div');
    notification.className = `notification notification-${type}`;
    notification.innerHTML = `
        <span class="notification-message">${message}</span>
        <button class="notification-close">&times;</button>
    `;
    
    Object.assign(notification.style, {
        position: 'fixed',
        top: '20px',
        right: '20px',
        padding: '1rem 1.5rem',
        borderRadius: '8px',
        boxShadow: '0 4px 15px rgba(0, 0, 0, 0.15)',
        zIndex: '9999',
        maxWidth: '400px',
        display: 'flex',
        justifyContent: 'space-between',
        alignItems: 'center',
        gap: '1rem'
    });
    
    const colors = {
        success: { bg: '#10b981', color: 'white' },
        error: { bg: '#ef4444', color: 'white' },
        info: { bg: '#3b82f6', color: 'white' }
    };
    
    const color = colors[type] || colors.info;
    notification.style.backgroundColor = color.bg;
    notification.style.color = color.color;
    
    const closeBtn = notification.querySelector('.notification-close');
    Object.assign(closeBtn.style, {
        background: 'none',
        border: 'none',
        color: 'inherit',
        fontSize: '1.5rem',
        cursor: 'pointer',
        padding: '0',
        lineHeight: '1'
    });
    
    closeBtn.addEventListener('click', () => notification.remove());
    document.body.appendChild(notification);
    
    setTimeout(() => {
        if (notification.parentNode) {
            notification.remove();
        }
    }, 5000);
}

// CSS 애니메이션 정의
const style = document.createElement('style');
style.textContent = `
    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(20px); }
        to { opacity: 1; transform: translateY(0); }
    }
    
    @keyframes fadeOut {
        from { opacity: 1; transform: translateY(0); }
        to { opacity: 0.3; transform: translateY(10px); }
    }
    
    .video-card.playing {
        box-shadow: 0 0 20px rgba(255, 136, 0, 0.3);
        border: 2px solid rgba(255, 136, 0, 0.5);
    }
    
    .tag:hover {
        transform: scale(1.1);
        background: var(--primary-color);
        color: var(--text-white);
        cursor: pointer;
    }
`;
document.head.appendChild(style);