// 主JavaScript文件 - 爱鉴花官方网站

document.addEventListener('DOMContentLoaded', function() {
    // 初始化函数
    initWebsite();
});

function initWebsite() {
    // 初始化导航栏滚动效果
    initNavbarScroll();
    
    // 初始化滚动动画
    initScrollAnimation();
    
    // 初始化表单验证
    initFormValidation();
    
    // 初始化计数器动画
    initCounterAnimation();
    
    // 初始化图片懒加载
    initLazyLoading();
    
    // 初始化移动端菜单
    initMobileMenu();
    
    // 初始化平滑滚动
    initSmoothScroll();
    
    // 初始化悬停动画
    initHoverEffects();
    
    // 初始化加载状态
    initLoadingStates();
    
    // 初始化页面过渡效果
    initPageTransitions();
}

// 导航栏滚动效果
function initNavbarScroll() {
    const navbar = document.querySelector('.navbar');
    
    window.addEventListener('scroll', function() {
        if (window.scrollY > 100) {
            navbar.classList.add('navbar-scrolled');
        } else {
            navbar.classList.remove('navbar-scrolled');
        }
    });
}

// 滚动动画效果
function initScrollAnimation() {
    const animatedElements = document.querySelectorAll('.card, .feature-icon');
    
    const observerOptions = {
        threshold: 0.1,
        rootMargin: '0px 0px -50px 0px'
    };
    
    const observer = new IntersectionObserver(function(entries) {
        entries.forEach(function(entry) {
            if (entry.isIntersecting) {
                entry.target.classList.add('fade-in-up');
                observer.unobserve(entry.target);
            }
        });
    }, observerOptions);
    
    animatedElements.forEach(function(element) {
        observer.observe(element);
    });
}

// 表单验证
function initFormValidation() {
    const forms = document.querySelectorAll('form');
    
    forms.forEach(function(form) {
        form.addEventListener('submit', function(e) {
            if (!validateForm(form)) {
                e.preventDefault();
            }
        });
    });
}

function validateForm(form) {
    let isValid = true;
    const inputs = form.querySelectorAll('input[required], textarea[required]');
    
    inputs.forEach(function(input) {
        if (!input.value.trim()) {
            showError(input, '此字段为必填项');
            isValid = false;
        } else if (input.type === 'email' && !isValidEmail(input.value)) {
            showError(input, '请输入有效的邮箱地址');
            isValid = false;
        } else {
            clearError(input);
        }
    });
    
    return isValid;
}

function isValidEmail(email) {
    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return emailRegex.test(email);
}

function showError(input, message) {
    clearError(input);
    
    const errorDiv = document.createElement('div');
    errorDiv.className = 'invalid-feedback';
    errorDiv.textContent = message;
    
    input.classList.add('is-invalid');
    input.parentNode.appendChild(errorDiv);
}

function clearError(input) {
    input.classList.remove('is-invalid');
    const errorDiv = input.parentNode.querySelector('.invalid-feedback');
    if (errorDiv) {
        errorDiv.remove();
    }
}

// 计数器动画
function initCounterAnimation() {
    const counters = document.querySelectorAll('.counter');
    
    if (counters.length > 0) {
        const observer = new IntersectionObserver(function(entries) {
            entries.forEach(function(entry) {
                if (entry.isIntersecting) {
                    animateCounters();
                    observer.unobserve(entry.target);
                }
            });
        });
        
        observer.observe(counters[0]);
    }
}

function animateCounters() {
    const counters = document.querySelectorAll('.counter');
    
    counters.forEach(function(counter) {
        const target = parseInt(counter.getAttribute('data-target'));
        const duration = 2000; // 2 seconds
        const frameDuration = 1000 / 60; // 60fps
        const totalFrames = Math.round(duration / frameDuration);
        let currentFrame = 0;
        
        const updateCounter = function() {
            currentFrame++;
            const progress = currentFrame / totalFrames;
            const currentValue = Math.round(target * progress);
            
            counter.textContent = currentValue.toLocaleString();
            
            if (currentFrame < totalFrames) {
                requestAnimationFrame(updateCounter);
            } else {
                counter.textContent = target.toLocaleString();
            }
        };
        
        updateCounter();
    });
}

// 图片懒加载
function initLazyLoading() {
    if ('IntersectionObserver' in window) {
        const lazyImages = document.querySelectorAll('img.lazy-load');
        
        const imageObserver = new IntersectionObserver(function(entries) {
            entries.forEach(function(entry) {
                if (entry.isIntersecting) {
                    const img = entry.target;
                    // 确保图片完全加载后显示
                    img.onload = function() {
                        img.classList.add('loaded');
                    };
                    // 处理data-src属性或直接使用src
                    if (img.hasAttribute('data-src')) {
                        img.src = img.getAttribute('data-src');
                        img.removeAttribute('data-src');
                    }
                    imageObserver.unobserve(img);
                }
            });
        }, {
            threshold: 0.1,
            rootMargin: '50px 0px'
        });
        
        lazyImages.forEach(function(img) {
            imageObserver.observe(img);
        });
    } else {
        // 浏览器不支持IntersectionObserver时的降级方案
        const lazyImages = document.querySelectorAll('img.lazy-load');
        lazyImages.forEach(function(img) {
            img.classList.add('loaded');
        });
    }
}

// 移动端菜单处理
function initMobileMenu() {
    const navbarToggler = document.querySelector('.navbar-toggler');
    const navbarCollapse = document.querySelector('.navbar-collapse');
    
    if (navbarToggler && navbarCollapse) {
        navbarToggler.addEventListener('click', function() {
            navbarCollapse.classList.toggle('show');
            // 添加菜单动画效果
            navbarToggler.classList.toggle('active');
        });
        
        // 点击菜单项后自动关闭菜单（移动端）
        const navLinks = document.querySelectorAll('.navbar-nav .nav-link');
        navLinks.forEach(function(link) {
            link.addEventListener('click', function() {
                if (window.innerWidth < 992) {
                    navbarCollapse.classList.remove('show');
                    navbarToggler.classList.remove('active');
                }
            });
        });
    }
}

// 平滑滚动效果
function initSmoothScroll() {
    // 内部链接平滑滚动
    const internalLinks = document.querySelectorAll('a[href^="#"]');
    
    internalLinks.forEach(function(link) {
        link.addEventListener('click', function(e) {
            e.preventDefault();
            
            const targetId = this.getAttribute('href').substring(1);
            const targetElement = document.getElementById(targetId);
            
            if (targetElement) {
                const offsetTop = targetElement.offsetTop - 80; // 考虑导航栏高度
                
                window.scrollTo({
                    top: offsetTop,
                    behavior: 'smooth'
                });
            }
        });
    });
    
    // 返回顶部按钮
    const backToTopBtn = document.createElement('button');
    backToTopBtn.className = 'back-to-top';
    backToTopBtn.innerHTML = '↑';
    backToTopBtn.setAttribute('aria-label', '返回顶部');
    
    backToTopBtn.addEventListener('click', function() {
        window.scrollTo({
            top: 0,
            behavior: 'smooth'
        });
    });
    
    // 滚动时显示/隐藏返回顶部按钮
    window.addEventListener('scroll', debounce(function() {
        if (window.scrollY > 500) {
            backToTopBtn.classList.add('show');
        } else {
            backToTopBtn.classList.remove('show');
        }
    }, 100));
    
    document.body.appendChild(backToTopBtn);
}

// 悬停动画效果
function initHoverEffects() {
    // 卡片悬停效果
    const cards = document.querySelectorAll('.card, .product-card, .news-card');
    
    cards.forEach(function(card) {
        card.addEventListener('mouseenter', function() {
            this.style.transform = 'translateY(-5px) scale(1.02)';
            this.style.boxShadow = '0 10px 25px rgba(0, 0, 0, 0.15)';
        });
        
        card.addEventListener('mouseleave', function() {
            this.style.transform = 'translateY(0) scale(1)';
            this.style.boxShadow = '0 4px 6px rgba(0, 0, 0, 0.1)';
        });
    });
    
    // 按钮悬停效果
    const buttons = document.querySelectorAll('.btn, .nav-link');
    
    buttons.forEach(function(button) {
        button.addEventListener('mouseenter', function() {
            this.style.transform = 'translateY(-2px)';
        });
        
        button.addEventListener('mouseleave', function() {
            this.style.transform = 'translateY(0)';
        });
    });
}

// 加载状态指示器
function initLoadingStates() {
    const forms = document.querySelectorAll('form');
    
    forms.forEach(function(form) {
        form.addEventListener('submit', function() {
            const submitBtn = this.querySelector('button[type="submit"]');
            if (submitBtn) {
                submitBtn.disabled = true;
                submitBtn.innerHTML = '<span class="spinner-border spinner-border-sm" role="status" aria-hidden="true"></span> 处理中...';
                
                // 3秒后恢复按钮状态（防止无限加载）
                setTimeout(function() {
                    submitBtn.disabled = false;
                    submitBtn.innerHTML = submitBtn.getAttribute('data-original-text') || '提交';
                }, 3000);
            }
        });
    });
    
    // 保存按钮原始文本
    document.addEventListener('DOMContentLoaded', function() {
        const submitButtons = document.querySelectorAll('button[type="submit"]');
        submitButtons.forEach(function(btn) {
            btn.setAttribute('data-original-text', btn.textContent);
        });
    });
}

// 页面过渡效果
function initPageTransitions() {
    // 链接点击时的过渡效果
    const links = document.querySelectorAll('a:not([href^="#"]):not([href^="javascript"])');
    
    links.forEach(function(link) {
        link.addEventListener('click', function(e) {
            if (this.href && !this.target && !this.hasAttribute('download')) {
                e.preventDefault();
                
                // 添加页面离开动画
                document.body.classList.add('page-leaving');
                
                setTimeout(function() {
                    window.location.href = link.href;
                }, 300);
            }
        });
    });
    
    // 页面进入动画
    document.body.classList.add('page-entering');
    
    setTimeout(function() {
        document.body.classList.remove('page-entering');
    }, 300);
}

// 工具函数：防抖
function debounce(func, wait) {
    let timeout;
    return function() {
        const context = this;
        const args = arguments;
        clearTimeout(timeout);
        timeout = setTimeout(function() {
            func.apply(context, args);
        }, wait);
    };
}

// 工具函数：节流
function throttle(func, limit) {
    let inThrottle;
    return function() {
        const args = arguments;
        const context = this;
        if (!inThrottle) {
            func.apply(context, args);
            inThrottle = true;
            setTimeout(function() {
                inThrottle = false;
            }, limit);
        }
    };
}

// 页面性能监控
function monitorPerformance() {
    // 页面加载时间
    window.addEventListener('load', function() {
        const loadTime = performance.timing.loadEventEnd - performance.timing.navigationStart;
        console.log('页面加载时间:', loadTime + 'ms');
    });
    
    // 最大内容绘制（LCP）
    new PerformanceObserver(function(entryList) {
        const entries = entryList.getEntries();
        const lastEntry = entries[entries.length - 1];
        console.log('LCP:', lastEntry.startTime);
    }).observe({type: 'largest-contentful-paint', buffered: true});
}

// 错误监控
function monitorErrors() {
    window.addEventListener('error', function(e) {
        console.error('JavaScript错误:', e.error);
    });
    
    window.addEventListener('unhandledrejection', function(e) {
        console.error('未处理的Promise拒绝:', e.reason);
    });
}

// 初始化性能和错误监控
monitorPerformance();
monitorErrors();

// 通用JavaScript功能

// 导航栏滚动效果
window.addEventListener('scroll', function() {
    const navbar = document.querySelector('.navbar');
    if (window.scrollY > 50) {
        navbar.classList.add('scrolled');
    } else {
        navbar.classList.remove('scrolled');
    }
});

// 懒加载图片
document.addEventListener('DOMContentLoaded', function() {
    const lazyImages = [].slice.call(document.querySelectorAll('img.lazy-load'));
    
    if ('IntersectionObserver' in window) {
        let lazyImageObserver = new IntersectionObserver(function(entries, observer) {
            entries.forEach(function(entry) {
                if (entry.isIntersecting) {
                    let lazyImage = entry.target;
                    lazyImage.src = lazyImage.dataset.src || lazyImage.src;
                    lazyImage.classList.remove('lazy-load');
                    lazyImageObserver.unobserve(lazyImage);
                }
            });
        });
        
        lazyImages.forEach(function(lazyImage) {
            lazyImageObserver.observe(lazyImage);
        });
    }
});

// 平滑滚动
document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', function (e) {
        e.preventDefault();
        
        const target = document.querySelector(this.getAttribute('href'));
        if (target) {
            window.scrollTo({
                top: target.offsetTop - 76,
                behavior: 'smooth'
            });
        }
    });
});

// 表单验证增强
(function() {
    'use strict';
    
    window.addEventListener('load', function() {
        // 获取所有表单并阻止默认提交行为
        var forms = document.getElementsByClassName('needs-validation');
        var validation = Array.prototype.filter.call(forms, function(form) {
            form.addEventListener('submit', function(event) {
                if (form.checkValidity() === false) {
                    event.preventDefault();
                    event.stopPropagation();
                }
                form.classList.add('was-validated');
            }, false);
        });
    }, false);
})();

// 动态年份更新
document.addEventListener('DOMContentLoaded', function() {
    const yearElements = document.querySelectorAll('.current-year');
    const currentYear = new Date().getFullYear();
    
    yearElements.forEach(element => {
        element.textContent = currentYear;
    });
});