const API_BASE = 'http://localhost:3000/api';
let currentReport = null;
let currentListPage = 1;

function toggleDateRange() {
    const useDateRange = document.getElementById('useDateRange').checked;
    document.getElementById('dateRangeFields').style.display = useDateRange ? 'block' : 'none';
    document.getElementById('normalFields').style.display = useDateRange ? 'none' : 'block';
}

function toggleDetailDateRange() {
    const useDetailDateRange = document.getElementById('useDetailDateRange').checked;
    document.getElementById('detailDateRangeFields').style.display = useDetailDateRange ? 'block' : 'none';
    document.getElementById('detailNormalFields').style.display = useDetailDateRange ? 'none' : 'block';
}

function switchTab(tabName) {
    // 隐藏所有标签内容
    document.querySelectorAll('.tab-content').forEach(content => {
        content.classList.remove('active');
    });
    document.querySelectorAll('.tab').forEach(tab => {
        tab.classList.remove('active');
    });

    // 显示选中的标签
    document.getElementById(tabName).classList.add('active');
    event.target.classList.add('active');
}

async function fetchList(pageNum) {
    const url = document.getElementById('listUrl').value;
    const page = pageNum || parseInt(document.getElementById('listPage').value) || 1;
    const loading = document.getElementById('listLoading');
    const results = document.getElementById('listResults');
    const pagination = document.getElementById('listPagination');

    currentListPage = page;
    document.getElementById('listPage').value = page;

    loading.classList.add('active');
    results.innerHTML = '';
    pagination.style.display = 'none';

    try {
        const response = await fetch(`${API_BASE}/list?url=${encodeURIComponent(url)}&page=${page}`);
        const data = await response.json();

        if (data.success) {
            displayList(data.data, results);
            updateListPagination(page, data.data.length > 0);
        } else {
            results.innerHTML = `<div class="error">错误: ${data.error}</div>`;
        }
    } catch (error) {
        results.innerHTML = `<div class="error">请求失败: ${error.message}</div>`;
    } finally {
        loading.classList.remove('active');
    }
}

function goToListPage(page) {
    if (page < 1) return;
    fetchList(page);
}

function updateListPagination(page, hasData) {
    const pagination = document.getElementById('listPagination');
    const currentPageSpan = document.getElementById('listCurrentPage');
    const prevBtn = document.getElementById('listPrevPage');
    const firstBtn = document.getElementById('listFirstPage');
    const nextBtn = document.getElementById('listNextPage');

    if (hasData) {
        pagination.style.display = 'flex';
        currentPageSpan.textContent = page;

        prevBtn.disabled = page <= 1;
        firstBtn.disabled = page <= 1;
        nextBtn.disabled = !hasData;
    }
}

function displayList(items, container) {
    if (items.length === 0) {
        container.innerHTML = '<p>没有找到公告</p>';
        return;
    }

    const html = `
        <div class="simple-list">
            <h3 style="margin-bottom: 15px;">找到 ${items.length} 条公告</h3>
            ${items.map((item, index) => `
                <div class="list-item">
                    <h3>${index + 1}. ${item.title}</h3>
                    <div class="meta">发布日期: ${item.date}</div>
                    <a href="${item.href}" target="_blank">查看详情 →</a>
                </div>
            `).join('')}
        </div>
    `;

    container.innerHTML = html;
}

async function fetchDetails() {
    const useDetailDateRange = document.getElementById('useDetailDateRange').checked;
    const loading = document.getElementById('detailLoading');
    const results = document.getElementById('detailResults');

    loading.classList.add('active');
    results.innerHTML = '';

    try {
        let listData;

        if (useDetailDateRange) {
            // 时间范围模式
            const startDate = document.getElementById('detailStartDate').value;
            const endDate = document.getElementById('detailEndDate').value;
            const maxPages = parseInt(document.getElementById('detailMaxPages').value);

            if (!startDate && !endDate) {
                results.innerHTML = '<div class="error">请至少填写开始日期或结束日期</div>';
                loading.classList.remove('active');
                return;
            }

            const dateRangeResponse = await fetch(`${API_BASE}/list-daterange`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ startDate, endDate, maxPages })
            });

            listData = await dateRangeResponse.json();
        } else {
            // 普通模式 - 按数量抓取多页
            const url = document.getElementById('detailUrl').value;
            const limit = parseInt(document.getElementById('detailLimit').value);

            // 抓取多页直到获得足够数量
            const allItems = [];
            let page = 1;
            const maxPagesToFetch = Math.ceil(limit / 10) + 1; // 假设每页约10条

            while (allItems.length < limit && page <= maxPagesToFetch) {
                const listResponse = await fetch(`${API_BASE}/list?url=${encodeURIComponent(url)}&page=${page}`);
                const pageData = await listResponse.json();

                if (!pageData.success) {
                    if (allItems.length === 0) {
                        results.innerHTML = `<div class="error">错误: ${pageData.error}</div>`;
                        loading.classList.remove('active');
                        return;
                    }
                    break;
                }

                if (pageData.data.length === 0) {
                    break;
                }

                allItems.push(...pageData.data);
                page++;

                // 如果还需要更多数据且未到达上限，稍作延迟
                if (allItems.length < limit && page <= maxPagesToFetch) {
                    await new Promise(resolve => setTimeout(resolve, 500));
                }
            }

            listData = { success: true, data: allItems };
        }

        if (!listData.success) {
            results.innerHTML = `<div class="error">错误: ${listData.error}</div>`;
            return;
        }

        // 抓取详情
        const limit = useDetailDateRange ? listData.data.length : parseInt(document.getElementById('detailLimit').value);
        const detailResponse = await fetch(`${API_BASE}/details`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ items: listData.data, limit })
        });

        const detailData = await detailResponse.json();

        if (detailData.success) {
            displayDetails(detailData.data, results);
        } else {
            results.innerHTML = `<div class="error">错误: ${detailData.error}</div>`;
        }
    } catch (error) {
        results.innerHTML = `<div class="error">请求失败: ${error.message}</div>`;
    } finally {
        loading.classList.remove('active');
    }
}

function displayDetails(items, container) {
    const html = `
        <div style="max-height: 380px; overflow-y: auto;">
            <h3 style="margin-bottom: 15px;">抓取了 ${items.length} 条详情</h3>
            ${items.map((item, index) => `
                <div class="list-item">
                    <h3>${index + 1}. ${item.title}</h3>
                    <div class="meta">发布日期: ${item.date}</div>
                    ${item.detail ? `
                        <div class="meta">发布时间: ${item.detail.publishTime || '未知'}</div>
                        ${item.detail.budget ? `
                            <span class="budget">${item.detail.budget.amount}${item.detail.budget.unit}</span>
                        ` : '<div class="meta">未找到预算信息</div>'}
                    ` : '<div class="error">抓取失败</div>'}
                    <br><a href="${item.href}" target="_blank">查看原文 →</a>
                </div>
            `).join('')}
        </div>
    `;

    container.innerHTML = html;
}

async function generateReport() {
    const useDateRange = document.getElementById('useDateRange').checked;
    const threshold = parseFloat(document.getElementById('reportThreshold').value);
    const loading = document.getElementById('reportLoading');
    const results = document.getElementById('reportResults');
    const exportBtn = document.getElementById('exportBtn');

    loading.classList.add('active');
    results.innerHTML = '';
    exportBtn.style.display = 'none';

    try {
        let response;

        if (useDateRange) {
            // 时间范围模式
            const startDate = document.getElementById('startDate').value;
            const endDate = document.getElementById('endDate').value;
            const maxPages = parseInt(document.getElementById('maxPages').value);

            if (!startDate && !endDate) {
                results.innerHTML = '<div class="error">请至少填写开始日期或结束日期</div>';
                loading.classList.remove('active');
                return;
            }

            response = await fetch(`${API_BASE}/report-daterange`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ startDate, endDate, threshold, maxPages })
            });
        } else {
            // 普通模式
            const url = document.getElementById('reportUrl').value;
            const limit = parseInt(document.getElementById('reportLimit').value);

            response = await fetch(`${API_BASE}/report`, {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ url, limit, threshold })
            });
        }

        const data = await response.json();

        if (data.success) {
            currentReport = data.data;
            displayReport(data.data, results);
            exportBtn.style.display = 'inline-block';
        } else {
            results.innerHTML = `<div class="error">错误: ${data.error}</div>`;
        }
    } catch (error) {
        results.innerHTML = `<div class="error">请求失败: ${error.message}</div>`;
    } finally {
        loading.classList.remove('active');
    }
}

function displayReport(report, container) {
    const html = `
        <div class="summary">
            <h2>统计摘要</h2>
            <div class="stat">
                <div class="stat-label">总项目数</div>
                <div class="stat-value">${report.summary.total_count}</div>
            </div>
            <div class="stat">
                <div class="stat-label">符合条件</div>
                <div class="stat-value">${report.summary.filtered_count}</div>
            </div>
            <div class="stat">
                <div class="stat-label">总金额</div>
                <div class="stat-value">${report.summary.total_amount}</div>
            </div>
            <div class="stat">
                <div class="stat-label">阈值</div>
                <div class="stat-value">${report.summary.threshold}</div>
            </div>
        </div>

        ${report.projects.length === 0 ? '<p>暂无符合条件的项目</p>' : `
            <h3 style="margin-bottom: 15px;">项目列表</h3>
            ${report.projects.map((project, index) => `
                <div class="list-item">
                    <h3>${index + 1}. ${project.title}</h3>
                    <div class="meta">发布日期: ${project.date}</div>
                    <div class="meta">发布时间: ${project.publish_time}</div>
                    <span class="budget">${project.budget.amount}${project.budget.unit}</span>
                    <div class="meta" style="margin-top: 8px;">金额描述: ${project.budget.text}</div>
                    <br><a href="${project.url}" target="_blank">查看详情 →</a>
                </div>
            `).join('')}
        `}
    `;

    container.innerHTML = html;
}

async function exportReport() {
    if (!currentReport) return;

    // 检查docx库是否加载
    if (!window.docx) {
        alert('Word导出库正在加载中,请稍后再试...');
        return;
    }

    const report = currentReport;
    const { Document, Packer, Paragraph, TextRun, HeadingLevel, AlignmentType } = window.docx;

    // 构建文档段落
    const paragraphs = [];

    // 标题
    paragraphs.push(
        new Paragraph({
            text: '南京公共工程建设项目报告',
            heading: HeadingLevel.HEADING_1,
            alignment: AlignmentType.CENTER,
            spacing: { after: 200 }
        })
    );

    // 生成时间
    paragraphs.push(
        new Paragraph({
            children: [
                new TextRun({
                    text: '生成时间: ',
                    bold: true
                }),
                new TextRun({
                    text: new Date(report.summary.generated_at).toLocaleString('zh-CN')
                })
            ],
            spacing: { after: 200 }
        })
    );

    // 统计摘要标题
    paragraphs.push(
        new Paragraph({
            text: '统计摘要',
            heading: HeadingLevel.HEADING_2,
            spacing: { before: 200, after: 100 }
        })
    );

    // 统计数据
    paragraphs.push(
        new Paragraph({
            children: [new TextRun({ text: `• 总项目数: ${report.summary.total_count}` })],
            spacing: { after: 50 }
        }),
        new Paragraph({
            children: [new TextRun({ text: `• 超过${report.summary.threshold}的项目: ${report.summary.filtered_count}` })],
            spacing: { after: 50 }
        }),
        new Paragraph({
            children: [new TextRun({ text: `• 总金额: ${report.summary.total_amount}` })],
            spacing: { after: 200 }
        })
    );

    // 项目列表标题
    paragraphs.push(
        new Paragraph({
            text: '项目列表',
            heading: HeadingLevel.HEADING_2,
            spacing: { before: 200, after: 100 }
        })
    );

    // 项目详情
    if (report.projects.length === 0) {
        paragraphs.push(
            new Paragraph({
                text: '暂无符合条件的项目。',
                spacing: { after: 100 }
            })
        );
    } else {
        report.projects.forEach((project, index) => {
            // 项目标题
            paragraphs.push(
                new Paragraph({
                    text: `${index + 1}. ${project.title}`,
                    heading: HeadingLevel.HEADING_3,
                    spacing: { before: 150, after: 100 }
                })
            );

            // 项目详情
            paragraphs.push(
                new Paragraph({
                    children: [
                        new TextRun({ text: '发布日期: ', bold: true }),
                        new TextRun({ text: project.date })
                    ],
                    spacing: { after: 50 }
                }),
                new Paragraph({
                    children: [
                        new TextRun({ text: '发布时间: ', bold: true }),
                        new TextRun({ text: project.publish_time })
                    ],
                    spacing: { after: 50 }
                }),
                new Paragraph({
                    children: [
                        new TextRun({ text: '预算金额: ', bold: true }),
                        new TextRun({ text: `${project.budget.amount}${project.budget.unit}` })
                    ],
                    spacing: { after: 50 }
                }),
                new Paragraph({
                    children: [
                        new TextRun({ text: '链接: ', bold: true }),
                        new TextRun({ text: project.url, color: '0000FF' })
                    ],
                    spacing: { after: 50 }
                }),
                new Paragraph({
                    children: [
                        new TextRun({ text: '金额描述: ', bold: true }),
                        new TextRun({ text: project.budget.text })
                    ],
                    spacing: { after: 100 }
                })
            );
        });
    }

    // 创建文档
    const doc = new Document({
        sections: [{
            properties: {},
            children: paragraphs
        }]
    });

    // 生成并下载Word文件
    const blob = await Packer.toBlob(doc);
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = `report_${new Date().getTime()}.docx`;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);
}