/**
 * 公共分页工具函数
 */

// 渲染分页导航
function renderPagination(pagination, pageChangeCallback) {
    const paginationEl = document.getElementById('pagination');
    if (!paginationEl) return;

    // 验证分页数据
    if (!pagination || typeof pagination !== 'object' || 
        !Number.isFinite(pagination.total_pages) || pagination.total_pages <= 1) {
        paginationEl.innerHTML = '';
        return;
    }

    let html = '';

    // 上一页
    if (pagination.has_prev) {
        html += `<li class="page-item">
                    <a class="page-link" href="#" data-page="${pagination.current_page - 1}">上一页</a>
                 </li>`;
    }

    // 页码
    const startPage = Math.max(1, pagination.current_page - 2);
    const endPage = Math.min(pagination.total_pages, pagination.current_page + 2);

    if (startPage > 1) {
        html += `<li class="page-item"><a class="page-link" href="#" data-page="1">1</a></li>`;
        if (startPage > 2) {
            html += `<li class="page-item disabled"><span class="page-link">...</span></li>`;
        }
    }

    for (let i = startPage; i <= endPage; i++) {
        html += `<li class="page-item ${i === pagination.current_page ? 'active' : ''}">
                    <a class="page-link" href="#" data-page="${i}">${i}</a>
                 </li>`;
    }

    if (endPage < pagination.total_pages) {
        if (endPage < pagination.total_pages - 1) {
            html += `<li class="page-item disabled"><span class="page-link">...</span></li>`;
        }
        html += `<li class="page-item"><a class="page-link" href="#" data-page="${pagination.total_pages}">${pagination.total_pages}</a></li>`;
    }

    // 下一页
    if (pagination.has_next) {
        html += `<li class="page-item">
                    <a class="page-link" href="#" data-page="${pagination.current_page + 1}">下一页</a>
                 </li>`;
    }

    paginationEl.innerHTML = html;

    // 绑定分页点击事件
    paginationEl.querySelectorAll('.page-link').forEach(link => {
        link.addEventListener('click', function(e) {
            e.preventDefault();
            const page = parseInt(this.dataset.page);
            if (page && page !== pagination.current_page) {
                if (typeof pageChangeCallback === 'function') {
                    pageChangeCallback(page);
                }
            }
        });
    });
}

// 获取URL参数
function getUrlParameter(name) {
    const urlParams = new URLSearchParams(window.location.search);
    return urlParams.get(name);
}

// 设置URL参数
function setUrlParameter(param, value) {
    const urlParams = new URLSearchParams(window.location.search);
    if (value === null || value === '') {
        urlParams.delete(param);
    } else {
        urlParams.set(param, value);
    }
    window.history.replaceState({}, '', `${window.location.pathname}?${urlParams.toString()}`);
}

// 批量更新复选框状态
function setupBatchSelection(selectAllId, itemCheckboxClass, selectedCountId, batchButtons) {
    const selectAll = document.getElementById(selectAllId);
    if (!selectAll) return;

    // 全选/取消全选
    selectAll.addEventListener('change', function() {
        const checkboxes = document.querySelectorAll(itemCheckboxClass);
        checkboxes.forEach(checkbox => {
            checkbox.checked = this.checked;
        });
        updateBatchButtons(selectedCountId, batchButtons);
    });

    // 单个复选框事件
    document.querySelectorAll(itemCheckboxClass).forEach(checkbox => {
        checkbox.addEventListener('change', () => {
            updateBatchButtons(selectedCountId, batchButtons);
        });
    });

    // 初始状态
    updateBatchButtons(selectedCountId, batchButtons);
}

// 更新批量操作按钮状态
function updateBatchButtons(selectedCountId, batchButtons) {
    const selectedCount = document.querySelectorAll('.license-checkbox:checked, .product-checkbox:checked, .device-checkbox:checked').length;
    
    if (selectedCountId) {
        const countElement = document.getElementById(selectedCountId);
        if (countElement) {
            countElement.textContent = `已选择 ${selectedCount} 项`;
        }
    }

    if (batchButtons) {
        batchButtons.forEach(buttonId => {
            const button = document.getElementById(buttonId);
            if (button) {
                button.style.display = selectedCount > 0 ? 'inline-block' : 'none';
            }
        });
    }
}