/**
 * 班级操行分管理系统 - 公共JS
 * 
 * 开发者: Canglan
 * 联系方式: admin@sea-studio.top
 * 版权归属: Sea Network Technology Studio
 * 许可证: MIT License
 * 
 * 版权所有 © Sea Network Technology Studio
 */

function getToken() {
    return localStorage.getItem(window.JWT_STORAGE_KEY || 'class_system_token');
}

function getUserInfo() {
    const userStr = localStorage.getItem(window.USER_STORAGE_KEY || 'class_system_user');
    if (!userStr) return null;
    try {
        return JSON.parse(userStr);
    } catch {
        return null;
    }
}

function setUserInfo(user) {
    localStorage.setItem(window.USER_STORAGE_KEY || 'class_system_user', JSON.stringify(user));
}

function clearAuth() {
    localStorage.removeItem(window.JWT_STORAGE_KEY || 'class_system_token');
    localStorage.removeItem(window.USER_STORAGE_KEY || 'class_system_user');
}

async function apiRequest(url, options = {}) {
    const token = getToken();
    const headers = {
        'Content-Type': 'application/json',
        ...options.headers
    };
    if (token) {
        headers['Authorization'] = `Bearer ${token}`;
    }
    
    const baseUrl = window.API_BASE_URL;
    const fullUrl = `${baseUrl}${url}`;
    
    try {
        const response = await fetch(fullUrl, { ...options, headers });
        const data = await response.json();
        
        if (response.status === 401) {
            clearAuth();
            
            // 同步清除 PHP Session，防止 index.php 302 重定向循环
            try {
                await fetch('/api/clear_session.php', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' }
                });
            } catch (e) {
                console.warn('[Auth] 清除PHP Session失败:', e);
            }
            
            // 防循环机制：检查是否已在登录页
            if (window.location.pathname === '/index.php' || window.location.pathname === '/') {
                console.warn('[Auth] 已在登录页收到401，停止重定向');
                return null;
            }
            
            // 防循环机制：5秒内重复401则停止重定向
            const now = Date.now();
            const lastRedirect = parseInt(sessionStorage.getItem('_last_401_redirect') || '0');
            if (now - lastRedirect < 5000) {
                console.warn('[Auth] 5秒内重复401，停止重定向。请检查Token是否有效。');
                return null;
            }
            sessionStorage.setItem('_last_401_redirect', now.toString());
            
            window.location.href = '/index.php';
            return null;
        }
        return data;
    } catch (error) {
        console.error('API请求错误:', error);
        showToast('网络错误，请稍后重试', 'error');
        return null;
    }
}

function apiGet(url, params = {}) {
    const queryString = new URLSearchParams(params).toString();
    const fullUrl = queryString ? `${url}?${queryString}` : url;
    return apiRequest(fullUrl, { method: 'GET' });
}

function apiPost(url, data = {}) {
    return apiRequest(url, {
        method: 'POST',
        body: JSON.stringify(data)
    });
}

function apiPut(url, data = {}) {
    return apiRequest(url, {
        method: 'PUT',
        body: JSON.stringify(data)
    });
}

function apiDelete(url) {
    return apiRequest(url, { method: 'DELETE' });
}

function showToast(message, type = 'success') {
    const toast = document.createElement('div');
    toast.className = `toast toast-${type}`;
    toast.textContent = message;
    document.body.appendChild(toast);
    setTimeout(() => toast.remove(), 3000);
}

function formatDate(dateStr) {
    if (!dateStr) return '-';
    const date = new Date(dateStr);
    return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')}`;
}

function formatDateTime(dateStr) {
    if (!dateStr) return '-';
    const date = new Date(dateStr);
    return `${date.getFullYear()}-${String(date.getMonth() + 1).padStart(2, '0')}-${String(date.getDate()).padStart(2, '0')} ${String(date.getHours()).padStart(2, '0')}:${String(date.getMinutes()).padStart(2, '0')}`;
}

function getStatusBadge(status, type = 'homework') {
    const statusMap = {
        homework: {
            'submitted': '已提交',
            'not_submitted': '未提交',
            'late': '迟交'
        },
        attendance: {
            'present': '出勤',
            'absent': '缺勤',
            'late': '迟到',
            'leave': '请假'
        }
    };
    const texts = statusMap[type] || statusMap.homework;
    const text = texts[status] || status;
    let className = 'status-badge ';
    switch (status) {
        case 'submitted':
        case 'present':
            className += 'status-submitted';
            break;
        case 'not_submitted':
        case 'absent':
            className += 'status-not_submitted';
            break;
        case 'late':
            className += 'status-late';
            break;
        case 'leave':
            className += 'status-leave';
            break;
        default:
            className += 'status-not_submitted';
    }
    return `<span class="${className}">${text}</span>`;
}

async function logout() {
    // 清除 PHP Session
    try {
        await fetch('/api/clear_session.php', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' }
        });
    } catch (e) {
        console.warn('清除Session失败', e);
    }
    
    // 清除后端 Token
    try {
        await apiPost('/api/auth/logout');
    } catch (e) {
        console.warn('后端登出失败', e);
    }
    
    // 清除 localStorage
    clearAuth();
    
    // 跳转回登录页
    window.location.href = '/index.php';
}

function escapeHtml(str) {
    if (!str) return '';
    return str.replace(/[&<>]/g, function(m) {
        if (m === '&') return '&amp;';
        if (m === '<') return '&lt;';
        if (m === '>') return '&gt;';
        return m;
    });
}

/**
 * 智能分页渲染（最多显示7个页码 + 跳转输入框）
 * @param {string|HTMLElement} container - 分页容器ID或DOM元素
 * @param {number} currentPage - 当前页码
 * @param {number} totalPages - 总页数
 * @param {function} onPageChange - 页码变化回调函数，参数为新的页码
 */
function renderSmartPagination(container, currentPage, totalPages, onPageChange) {
    if (typeof container === 'string') {
        container = document.getElementById(container);
    }
    if (!container || totalPages <= 1) {
        if (container) container.innerHTML = '';
        return;
    }

    const MAX_VISIBLE = 7;
    let html = '';

    // 上一页按钮
    if (currentPage > 1) {
        html += `<a href="#" class="page-nav" data-page="${currentPage - 1}">&laquo; 上一页</a>`;
    }

    if (totalPages <= MAX_VISIBLE) {
        // 总页数不超过最大显示数，全部显示
        for (let i = 1; i <= totalPages; i++) {
            if (i === currentPage) {
                html += `<span class="active">${i}</span>`;
            } else {
                html += `<a href="#" data-page="${i}">${i}</a>`;
            }
        }
    } else {
        // 需要省略号
        // 始终显示第1页
        if (currentPage === 1) {
            html += `<span class="active">1</span>`;
        } else {
            html += `<a href="#" data-page="1">1</a>`;
        }

        // 计算中间页码范围
        let start = Math.max(2, currentPage - 2);
        let end = Math.min(totalPages - 1, currentPage + 2);

        // 调整确保中间至少有3个页码（加上首尾共5-7个）
        if (currentPage <= 3) {
            end = Math.min(5, totalPages - 1);
        }
        if (currentPage >= totalPages - 2) {
            start = Math.max(2, totalPages - 4);
        }

        // 前省略号
        if (start > 2) {
            html += `<span class="ellipsis">...</span>`;
        }

        // 中间页码
        for (let i = start; i <= end; i++) {
            if (i === currentPage) {
                html += `<span class="active">${i}</span>`;
            } else {
                html += `<a href="#" data-page="${i}">${i}</a>`;
            }
        }

        // 后省略号
        if (end < totalPages - 1) {
            html += `<span class="ellipsis">...</span>`;
        }

        // 始终显示最后一页
        if (currentPage === totalPages) {
            html += `<span class="active">${totalPages}</span>`;
        } else {
            html += `<a href="#" data-page="${totalPages}">${totalPages}</a>`;
        }
    }

    // 下一页按钮
    if (currentPage < totalPages) {
        html += `<a href="#" class="page-nav" data-page="${currentPage + 1}">下一页 &raquo;</a>`;
    }

    // 页码跳转
    html += `<span class="page-jump">跳至 <input type="number" min="1" max="${totalPages}" placeholder="页码"> / ${totalPages}页</span>`;

    container.innerHTML = html;

    // 绑定页码点击事件
    container.querySelectorAll('a[data-page]').forEach(link => {
        link.addEventListener('click', function(e) {
            e.preventDefault();
            const page = parseInt(this.dataset.page);
            if (page && page !== currentPage && page >= 1 && page <= totalPages) {
                onPageChange(page);
            }
        });
    });

    // 绑定跳转输入框事件
    const jumpInput = container.querySelector('.page-jump input');
    if (jumpInput) {
        jumpInput.addEventListener('keydown', function(e) {
            if (e.key === 'Enter') {
                e.preventDefault();
                const page = parseInt(this.value);
                if (page && page >= 1 && page <= totalPages) {
                    onPageChange(page);
                } else {
                    showToast(`请输入1-${totalPages}之间的页码`, 'warning');
                }
            }
        });
    }
}

document.addEventListener('DOMContentLoaded', () => {
    const user = getUserInfo();
    const userNameSpan = document.getElementById('userName');
    if (userNameSpan && user) {
        userNameSpan.textContent = user.real_name || user.username;
    }
    const logoutBtn = document.getElementById('logoutBtn');
    if (logoutBtn) {
        logoutBtn.addEventListener('click', logout);
    }
});