document.addEventListener('DOMContentLoaded', function () {
    // 获取DOM元素 - 计算器模块
    const calculateBtn = document.getElementById('calculate-btn');
    const solutionsContainer = document.getElementById('solutions');
    const statsContainer = document.getElementById('stats');

    // 获取DOM元素 - 一星数据模块
    const flag1MinInput = document.getElementById('flag1-min');
    const flag1SearchBtn = document.getElementById('flag1-search-btn');
    const flag1Table = document.getElementById('flag1-table');

    // 获取DOM元素 - 二星数据模块
    const flag2MinInput = document.getElementById('flag2-min');
    const flag2SearchBtn = document.getElementById('flag2-search-btn');
    const flag2Table = document.getElementById('flag2-table');

    // 获取DOM元素 - 历史记录模块
    const historyTypeSelect = document.getElementById('history-type');
    const historyStartDateInput = document.getElementById('history-start-date');
    const historyEndDateInput = document.getElementById('history-end-date');
    const historySearchBtn = document.getElementById('history-search-btn');
    const historyContainer = document.getElementById('history-container');
    const historyStats = document.getElementById('history-stats');

    // 获取DOM元素 - 我的收藏模块
    const favoriteContainer = document.getElementById('favorite-container');
    const favoriteStats = document.getElementById('favorite-stats');

    // 获取DOM元素 - 出题模块
    const problemContent = document.getElementById('problem-content');
    const problemAnswer = document.getElementById('problem-answer');
    const showAnswerBtn = document.getElementById('show-answer-btn');

    // 数字输入框
    const num1Input = document.getElementById('num1');
    const num2Input = document.getElementById('num2');
    const num3Input = document.getElementById('num3');
    const num4Input = document.getElementById('num4');

    // 限制输入范围为1-13
    [num1Input, num2Input, num3Input, num4Input].forEach(input => {
        input.addEventListener('input', function () {
            const value = parseInt(this.value);
            if (value < 1) this.value = 1;
            if (value > 13) this.value = 13;
        });
    });
    // 定义SVG图标
    const svgIcons = {
        star: `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2"></polygon></svg>`,
        starFilled: `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="currentColor" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2"></polygon></svg>`,
        trash: `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="3 6 5 6 21 6"></polyline><path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"></path></svg>`,
        eye: `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path><circle cx="12" cy="12" r="3"></circle></svg>`,
        eyeOff: `<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M17.94 17.94A10.07 10.07 0 0 1 12 20c-7 0-11-8-11-8a18.45 18.45 0 0 1 5.06-5.94M9.9 4.24A9.12 9.12 0 0 1 12 4c7 0 11 8 11 8a18.5 18.5 0 0 1-2.16 3.19m-6.72-1.07a3 3 0 1 1-4.24-4.24"></path><line x1="1" y1="1" x2="23" y2="23"></line></svg>`
    };
    // 存储当前解法和问题数据
    let currentSolutions = [];
    let currentProblem = null;

    // 获取问题类型选择框和出题按钮
    const problemTypeSelect = document.getElementById('problem-type-select');
    const generateProblemBtn = document.getElementById('generate-problem-btn');

    // 为出题按钮添加点击事件
    generateProblemBtn.addEventListener('click', function () {
        const selectedType = problemTypeSelect.value;
        if (selectedType) {
            // 根据选择的类型生成题目
            generateProblem(selectedType);
        } else {
            // 如果没有选择类型，提示用户
            problemContent.innerHTML = '<p class="error">请先选择题目类型</p>';
        }
    });


    // 为显示答案按钮添加点击事件
    showAnswerBtn.addEventListener('click', function () {
        if (currentProblem && currentProblem.answers) {
            console.log('currentProblem:', currentProblem.answers)
            if (problemAnswer.style.display === 'block') {
                problemAnswer.style.display = 'none';
                showAnswerBtn.innerHTML = '显示答案';
            } else {
                problemAnswer.style.display = 'block';
                renderProblemAnswers(currentProblem.answers);
                showAnswerBtn.innerHTML = '隐藏答案';
            }

        }
    });

    // 初始化显示答案按钮图标
    if (showAnswerBtn) {
        showAnswerBtn.innerHTML = '显示答案';
    }

    // 为计算按钮添加点击事件
    calculateBtn.addEventListener('click', fetchSolutions);

    // 为历史记录查询按钮添加点击事件
    historySearchBtn.addEventListener('click', () => { fetchHistory(false) });

    // 添加滚动监听器，实现自动加载更多
    document.querySelector('.history-data-container').addEventListener('scroll', function () {
        const module5 = document.querySelector('.module-5');
        const module6 = document.querySelector('.module-6');

        // 检查历史记录模块是否可见
        if (module5.style.display === 'block') {
            const historyStatsRect = historyStats.getBoundingClientRect();
            if (historyStatsRect.top <= window.innerHeight && !isLoadingHistory && hasMoreHistory) {
                fetchHistory(true);
            }
        }

        // 检查收藏模块是否可见
        if (module6.style.display === 'block') {
            const favoriteStatsRect = favoriteStats.getBoundingClientRect();
            if (favoriteStatsRect.top <= window.innerHeight && !isLoadingFavorite && hasMoreFavorite) {
                fetchFavorites(true);
            }
        }
    });

    // 根据题型生成题目
    let answerTimer = null;
    let timerInterval = null;
    let timerSeconds = 0;
    let timerDisplay;

    async function generateProblem(type) {
        if (answerTimer) clearTimeout(answerTimer);
        if (timerInterval) clearInterval(timerInterval);

        // 重置问题和答案区域
        problemContent.innerHTML = '<p class="placeholder">正在生成题目，请稍候...</p>';
        problemAnswer.innerHTML = '';
        problemAnswer.style.display = 'none';
        showAnswerBtn.style.display = 'none';
        currentProblem = null;

        // 重置计时器
        timerSeconds = 0;

        try {
            // 调用API获取问题
            const response = await fetch(`/api/questions?t=${type}`);
            const data = await response.json();

            if (response.ok && data.question) {
                // 保存当前问题数据
                currentProblem = data;
                problemContent.dataset.id = currentProblem.record_id;
                // 显示问题内容
                problemContent.innerHTML = `<div class="problem-text">
                <div class="pre-container">
                    <button  type="button" class="icon-btn favorite-btn" title="添加收藏">${svgIcons.star}</button>
                    <div class="timer-container">
                        <span id="timer-display" class="timer-display">00:00</span>
                    </div>
                </div>
                ${data.question}
                </div>`;

                // 如果有数字，显示数字
                if (data.numbers) {
                    const numbersHTML = `
                        <div class="problem-numbers">
                            ${data.numbers.map(num => `<span class="problem-number">${num === null ? '?' : num}</span>`).join('')}
                        </div>
                    `;
                    problemContent.innerHTML += numbersHTML;
                }
                timerDisplay = document.getElementById('timer-display');

                // 开始计时
                startTimer();

                // 显示答案按钮
                answerTimer = setTimeout(() => {
                    showAnswerBtn.innerHTML = ' 显示答案';
                    showAnswerBtn.style.display = 'block';
                }, 10 * 1000);
            } else {
                problemContent.innerHTML = `<p class="error">${data.detail || '获取题目失败'}</p>`;
            }
        } catch (error) {
            console.error('Error:', error);
            problemContent.innerHTML = '<p class="error">请求失败，请检查网络连接</p>';
        }

        // 为收藏按钮添加点击事件
        problemContent.querySelectorAll('.favorite-btn').forEach((btn, index) => {
            btn.addEventListener('click', async function () {
                const card = this.closest('.problem-content'), is_favorite = this.classList.contains('active');
                const recordId = card.dataset.id;

                try {
                    const response = await fetch(`/api/history/${recordId}/favorite`, {
                        method: 'POST'
                    });

                    if (response.ok) {
                        if (is_favorite) {
                            this.innerHTML = svgIcons.star;
                            this.classList.remove('active');
                            alert('取消成功');
                        } else {
                            this.innerHTML = svgIcons.starFilled;
                            this.classList.add('active');
                            alert('收藏成功');
                        }
                    } else {
                        alert('收藏失败，请重试');
                    }
                } catch (error) {
                    console.error('收藏操作失败：', error);
                    alert('收藏失败，请检查网络连接');
                }
            });
        });


        // 开始计时器
        function startTimer() {
            // 清除之前的计时器
            if (timerInterval) {
                clearInterval(timerInterval);
            }

            // 重置计时
            timerSeconds = 0;
            updateTimerDisplay();

            // 启动新的计时器
            timerInterval = setInterval(() => {
                timerSeconds++;
                if (timerSeconds > 130) {
                    clearInterval(timerInterval);
                }
                updateTimerDisplay();
            }, 1000);
        }

        // 更新计时器显示
        function updateTimerDisplay() {
            if (timerDisplay) {
                if (timerSeconds >= 120) {
                    timerDisplay.textContent = "时间到";
                    timerDisplay.classList.add('time-up');
                } else {
                    const minutes = Math.floor(timerSeconds / 60);
                    const seconds = timerSeconds % 60;
                    timerDisplay.textContent = `${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
                    timerDisplay.classList.remove('time-up');
                }
            }
        }
    }

    generateProblem(0)
    // 渲染问题答案
    function renderProblemAnswers(answers) {
        if (!answers || answers.length === 0) {
            problemAnswer.innerHTML = '<p class="placeholder">没有找到答案</p>';
            return;
        }

        // 根据答案类型渲染不同的内容
        if (Array.isArray(answers)) {
            // 如果是数组，渲染为列表
            const answersHTML = answers.map(answer => {
                if (typeof answer === 'object' && answer.expression) {
                    // 如果是解法对象
                    return `
                        <div class="solution-item flag-${answer.flag || 0}">
                            <div class="solution-expression">${answer.expression}</div>
                            <div class="solution-flag flag-${answer.flag || 0}">
                                ${answer.flag === 1 ? '★' : answer.flag === 2 ? '★★' : ''}
                            </div>
                        </div>
                    `;
                } else {
                    // 如果是普通文本
                    return `<div class="answer-item">${answer}</div>`;
                }
            }).join('');

            problemAnswer.innerHTML = `
                <h3>答案</h3>
                <div class="answers-container">
                    ${answersHTML}
                </div>
            `;
        } else if (typeof answers === 'object') {
            // 如果是单个对象
            const answerKeys = Object.keys(answers);
            const answersHTML = answerKeys.map(key => {
                return `
                    <div class="answer-group">
                        <div class="answer-key">${key}:</div>
                        <div class="answer-value">${answers[key]}</div>
                    </div>
                `;
            }).join('');

            problemAnswer.innerHTML = `
                <h3>答案</h3>
                <div class="answers-container">
                    ${answersHTML}
                </div>
            `;
        } else {
            // 如果是单个值
            problemAnswer.innerHTML = `
                <h3>答案</h3>
                <div class="answers-container">
                    <div class="answer-item">${answers}</div>
                </div>
            `;
        }
    }

    // 获取解法
    async function fetchSolutions() {
        // 获取输入值
        const num1 = parseInt(num1Input.value) || 1;
        const num2 = parseInt(num2Input.value) || 1;
        const num3 = parseInt(num3Input.value) || 1;
        const num4 = parseInt(num4Input.value) || 1;

        // 显示加载状态
        solutionsContainer.innerHTML = '<p class="placeholder">正在计算解法，请稍候...</p>';
        statsContainer.textContent = '';

        try {
            // 调用API
            const response = await fetch(`/api/solutions?num1=${num1}&num2=${num2}&num3=${num3}&num4=${num4}`);
            const data = await response.json();

            if (response.ok) {
                // 保存解法
                currentSolutions = data.solutions || [];

                // 显示统计信息
                if (currentSolutions.length > 0) {
                    statsContainer.textContent = `共 ${data.count} 种解法（一星: ${data.flag1_count}, 二星: ${data.flag2_count}）`;
                } else {
                    statsContainer.textContent = '没有找到任何解法';
                }

                // 渲染解法
                renderSolutions();
            } else {
                // 显示错误信息
                solutionsContainer.innerHTML = `<p class="error">${data.detail || '没有找到解法'}</p>`;
                statsContainer.textContent = '';
            }
        } catch (error) {
            console.error('Error:', error);
            solutionsContainer.innerHTML = '<p class="error">请求失败，请检查网络连接</p>';
            statsContainer.textContent = '';
        }
    }

    // 渲染解法
    function renderSolutions() {
        // 如果没有解法
        if (!currentSolutions || currentSolutions.length === 0) {
            solutionsContainer.innerHTML = '<p class="placeholder">没有找到匹配的解法，请尝试其他数字组合</p>';
            return;
        }

        // 直接使用所有解法
        const filteredSolutions = currentSolutions;

        // 渲染解法列表
        const solutionsHTML = filteredSolutions.map(solution => {
            return `
                <div class="solution-item flag-${solution.flag}">
                    <div class="solution-expression">${solution.expression}</div>
                    <div class="solution-flag flag-${solution.flag}">
                        ${solution.flag === 1 ? '★' : solution.flag === 2 ? '★★' : ''}
                    </div>
                </div>
            `;
        }).join('');

        solutionsContainer.innerHTML = solutionsHTML;
    }


    // 为一星数据查询按钮添加点击事件
    flag1SearchBtn.addEventListener('click', async function () {
        const min = flag1MinInput.value || 1;
        await fetchFlagData(1, min, flag1Table);
    });

    // 为二星数据查询按钮添加点击事件
    flag2SearchBtn.addEventListener('click', async function () {
        const min = flag2MinInput.value || 1;
        await fetchFlagData(2, min, flag2Table);
    });

    // 获取一星/二星数据
    async function fetchFlagData(flag, min, tableElement) {
        // 显示加载状态
        tableElement.querySelector('tbody').innerHTML = '<tr><td colspan="2" class="placeholder">正在加载数据，请稍候...</td></tr>';

        try {
            // 调用API获取数据
            const response = await fetch(`/api/flag?flag=${flag}&min_num=${min}&max_num=`);
            const data = await response.json();
            if (response.ok && data.length > 0) {
                // 处理数据并按数字组合分组
                const groupedData = {};

                data.forEach(item => {
                    // 创建数字组合的键
                    const numbersKey = [item.n1, item.n2, item.n3, item.n4].sort((a, b) => a - b).join(',');

                    // 如果这个数字组合不存在，创建一个新数组
                    if (!groupedData[numbersKey]) {
                        groupedData[numbersKey] = [];
                    }

                    // 添加解法到对应的数字组合
                    item.s.forEach(solution => {
                        groupedData[numbersKey].push({
                            expression: solution.c,
                            flag: solution.f
                        });
                    });
                });
                console.log(groupedData);

                // 渲染表格
                renderFlagTable(groupedData, tableElement, flag);
            } else {
                // 显示无数据信息
                tableElement.querySelector('tbody').innerHTML = '<tr><td colspan="2" class="placeholder">没有找到匹配的数据</td></tr>';
            }
        } catch (error) {
            console.error('Error:', error);
            tableElement.querySelector('tbody').innerHTML = '<tr><td colspan="2" class="error">请求失败，请检查网络连接</td></tr>';
        }
    }

    // 渲染一星/二星数据表格
    function renderFlagTable(groupedData, tableElement, currentFlag) {
        const tbody = tableElement.querySelector('tbody');
        tbody.innerHTML = '';

        // 遍历分组数据
        Object.entries(groupedData).forEach(([numbersKey, solutions]) => {
            const tr = document.createElement('tr');

            // 数字单元格
            const tdNumbers = document.createElement('td');
            tdNumbers.className = 'number-cell';
            tdNumbers.textContent = numbersKey;
            tr.appendChild(tdNumbers);

            // 表达式单元格
            const tdExpressions = document.createElement('td');
            tdExpressions.className = 'expressions-cell';
            const container = document.createElement('div');
            container.className = 'expression-container hidden';
            // 创建显示按钮
            const toggleBtn = document.createElement('button');
            toggleBtn.className = 'toggle-btn';
            toggleBtn.textContent = '查看答案';

            // 添加每个表达式
            solutions.forEach(solution => {
                // const expressionDiv = document.createElement('div');
                // expressionDiv.className = `expression-item flag-${solution.flag}`;
                // expressionDiv.textContent = solution.expression;
                const expressionDiv = document.createElement('div');
                expressionDiv.className = `expression-item flag-${solution.flag} `;
                expressionDiv.textContent = solution.expression;
                container.appendChild(expressionDiv);
            });
            tdExpressions.appendChild(container);
            // 按钮点击事件
            toggleBtn.addEventListener('click', () => {
                container.classList.remove('hidden');
                toggleBtn.remove();
            });
            tdExpressions.appendChild(toggleBtn);
            tr.appendChild(tdExpressions);
            tbody.appendChild(tr);
        });

        // 如果没有数据
        if (tbody.children.length === 0) {
            tbody.innerHTML = '<tr><td colspan="2" class="placeholder">没有找到匹配的数据</td></tr>';
        }
    }

    // 添加模块切换事件监听
    const moduleSelect = document.getElementById('module-select');
    moduleSelect.addEventListener('change', function () {
        document.querySelectorAll('.module-container').forEach(module => {
            module.style.display = 'none';
        });
        document.querySelector(`.module-` + this.value).style.display = 'block';

        // 切换到计算器模块时重置输入框
        if (this.value === '2') {
            [num1Input, num2Input, num3Input, num4Input].forEach(input => input.value = 1);
            solutionsContainer.innerHTML = '<p class="placeholder">请输入4个数字并点击"计算解法"按钮</p>';
        }

        // 切换到一星数据模块时加载数据
        if (this.value === '3' && flag1Table.querySelector('tbody tr td.placeholder')) {
            fetchFlagData(1, flag1MinInput.value, flag1Table);
        }

        // 切换到二星数据模块时加载数据
        if (this.value === '4' && flag2Table.querySelector('tbody tr td.placeholder')) {
            fetchFlagData(2, flag2MinInput.value, flag2Table);
        }

        // 切换到历史记录模块时加载数据
        if (this.value === '5' && historyContainer) {
            fetchHistory(false);
        }

        // 切换到我的收藏模块时加载数据
        if (this.value === '6' && favoriteContainer) {
            fetchFavorites(false);
        }
    });

    // 初始化默认显示模块
    document.querySelectorAll('.module-container').forEach(module => {
        module.style.display = module.classList.contains('module-1') ? 'block' : 'none';
    });

    // 历史记录相关变量
    let currentHistoryPage = 1;
    let isLoadingHistory = false;
    let hasMoreHistory = true;

    // 收藏记录相关变量
    let currentFavoritePage = 1;
    let isLoadingFavorite = false;
    let hasMoreFavorite = true;


    // 获取历史记录数据
    async function fetchHistory(loadMore = false) {
        if (isLoadingHistory) return;
        isLoadingHistory = true;
        historyStats.textContent = ''

        if (!loadMore) {
            currentHistoryPage = 1;
            hasMoreHistory = true;
        }

        try {
            // 构建查询参数
            const params = new URLSearchParams();
            if (historyTypeSelect.value) {
                params.append('game_type', historyTypeSelect.value);
            }
            if (historyStartDateInput.value) {
                params.append('start_date', historyStartDateInput.value);
            }
            if (historyEndDateInput.value) {
                params.append('end_date', historyEndDateInput.value);
            }
            params.append('page', currentHistoryPage.toString());
            params.append('page_size', '10');

            // 调用API获取历史记录
            const response = await fetch(`/api/history?${params.toString()}`);
            const data = await response.json();

            if (response.ok && data.history) {
                // 渲染历史记录
                renderHistoryData(data.history, historyContainer, loadMore, false);
                // 更新分页状态
                hasMoreHistory = currentHistoryPage < data.total_pages;
                const historyRecordsStats = document.querySelector('.history-records-stats span');
                historyRecordsStats.textContent = data.count
                // 如果成功加载，增加页码
                currentHistoryPage++;

            } else {
                throw new Error(data.detail || '获取历史记录失败');
            }
        } catch (error) {
            if (!loadMore) {
                historyContainer.innerHTML = `<div class="error">${error.message}</div>`;
                historyStats.textContent = '加载失败';
            } else {
                // 显示加载失败消息
                alert('加载更多历史记录失败: ' + error.message);
            }
        } finally {
            isLoadingHistory = false;
        }
    }
    // 获取收藏记录数据
    async function fetchFavorites(loadMore = false) {
        if (isLoadingFavorite) return;
        isLoadingFavorite = true;
        favoriteStats.textContent = ''
        // 如果不是加载更多，则重置状态
        if (!loadMore) {
            currentFavoritePage = 1;
            hasMoreFavorite = true;
        }

        try {
            // 构建查询参数
            const params = new URLSearchParams();
            params.append('page', currentFavoritePage);
            params.append('page_size', "10");
            params.append('only_favorite', "true");
            params.append('include_deleted', "false");

            // 调用API获取收藏记录
            const response = await fetch(`/api/history?${params.toString()}`);
            const data = await response.json();

            if (response.ok) {
                // 渲染历史记录
                renderHistoryData(data.history, favoriteContainer, loadMore, true);
                // 更新分页状态
                hasMoreFavorite = currentFavoritePage < data.total_pages;

                const favoriteRecordsStats = document.querySelector('.favorite-records-stats span');
                favoriteRecordsStats.textContent = data.count
                // 更新分页状态
                currentFavoritePage++;
            } else {
                if (!loadMore) {
                    favoriteContainer.innerHTML = `<div class="error">${data.detail || '获取收藏记录失败'}</div>`;
                    favoriteStats.textContent = '加载失败';
                }
            }
        } catch (error) {
            console.error('Error:', error);
            if (!loadMore) {
                favoriteContainer.innerHTML = '<div class="error">请求失败，请检查网络连接</div>';
                favoriteStats.textContent = '加载失败';
            }
        } finally {
            isLoadingFavorite = false;
        }
    }

    function renderHistoryData(historyItems, container, append = false, isFavorite = false) {
        if (!historyItems || historyItems.length === 0) {
            if (!append) {
                container.innerHTML = `<div class="placeholder">${isFavorite ? '暂无收藏记录' : '没有找到历史记录'}</div>`;
            }
            return;
        }

        // 构建卡片内容
        let cardsHTML = ``;
        historyItems.forEach(item => {
            // 格式化日期时间
            const date = new Date(item.created_at);
            const formattedDate = `${date.getFullYear()}-${(date.getMonth() + 1).toString().padStart(2, '0')}-${date.getDate().toString().padStart(2, '0')} ${date.getHours().toString().padStart(2, '0')}:${date.getMinutes().toString().padStart(2, '0')}`;

            // 获取操作类型的中文名称
            const type_names = {
                "A": "推理未知数",
                "B": "一题多解1",
                "C": "一题多解2",
                "D": "一星题目",
                "E": "二星题目"
            };

            let typeText = type_names[item.game_type] || item.game_type || '未知类型';
            let typeClass = `type-${(item.game_type || '').toLowerCase()}`;
            if (!type_names[item.game_type]) {
                typeClass = 'type-unknown';
            }

            // 解析答案数据
            let answers = null;

            try {
                // 尝试解析JSON字符串
                if (item.answers && typeof item.answers === 'string') {
                    const jsonString = item.answers.replace(/'/g, '"');
                    answers = JSON.parse(jsonString);
                } else if (item.answers) {
                    answers = item.answers;
                }
            } catch (e) {
                // 如果解析失败，直接使用原始字符串
                answers = item.answers;
            }
            // 构建卡片HTML
            cardsHTML += `
            <div class="history-card ${typeClass}" data-id="${item.id}">
                <div class="history-card-header">
                    <span class="history-card-type">${typeText}</span>
                    <div class="history-card-actions">
                        <button type="button" class="icon-btn show-history-answer-btn" title="显示答案">${svgIcons.eye}</button>
                        ${item.is_favorite ? `<button  type="button" class="icon-btn favorite-btn active" title="取消收藏">${svgIcons.starFilled}</button>` : `<button  type="button" class="icon-btn favorite-btn" title="添加收藏">${svgIcons.star}</button>`}
                        ${item.is_deleted ? `<button  type="button" class="icon-btn delete-btn active" title="恢复">${svgIcons.trash}</button>` : isFavorite ? '' : `<button class="icon-btn delete-btn" title="删除">${svgIcons.trash}</button>`}
                    </div>
                    <span class="history-card-time">${formattedDate}</span>
                </div>
                <div class="history-card-content">
                    <div class="problem-text">${item.question || ''}</div>
                    ${item.numbers ? `<div class="problem-numbers">
                        ${item.numbers.split(',').map(num => `<span class="problem-number">${num.trim() === 'None' ? "?" : num.trim()}</span>`).join('')}
                    </div>` : ''}
                </div>
                <div class="history-card-answers" style="display: none;">
                ${renderHistoryAnswers(answers)}
                </div>
            </div>
            `;
        });

        // 如果是追加模式，则添加到现有内容后面
        if (append) {
            container.innerHTML += cardsHTML;
        } else {
            container.innerHTML = cardsHTML;
        }

        // 为所有显示答案按钮添加点击事件
        container.querySelectorAll('.show-history-answer-btn').forEach((btn, index) => {
            btn.addEventListener('click', function () {
                const card = this.closest('.history-card');
                const answersContainer = card.querySelector('.history-card-answers');

                if (answersContainer.style.display === 'block') {
                    // 隐藏答案
                    answersContainer.style.display = 'none';
                    this.innerHTML = svgIcons.eye;
                    this.title = '显示答案';
                } else {
                    // 显示答案
                    answersContainer.style.display = 'block';
                    this.innerHTML = svgIcons.eyeOff;
                    this.title = '隐藏答案';
                }
            });
        });

        // 为收藏按钮添加点击事件
        container.querySelectorAll('.favorite-btn').forEach((btn, index) => {
            btn.addEventListener('click', async function () {
                const card = this.closest('.history-card'), is_favorite = this.classList.contains('active');
                const recordId = card.dataset.id;

                try {
                    const response = await fetch(`/api/history/${recordId}/favorite`, {
                        method: 'POST'
                    });

                    if (response.ok) {
                        if (is_favorite) {
                            this.innerHTML = svgIcons.star;
                            this.title = '未收藏';
                            this.classList.remove('active');
                            if (isFavorite) {
                                card.remove();
                                // 如果没有卡片了，显示空提示
                                if (container.querySelectorAll('.history-card').length === 0) {
                                    container.innerHTML = '<div class="placeholder">暂无记录</div>';
                                }
                            }
                            alert('取消成功');
                        } else {
                            this.innerHTML = svgIcons.starFilled;
                            this.title = '已收藏';
                            this.classList.add('active');

                            alert('收藏成功');
                        }
                    } else {
                        alert('收藏失败，请重试');
                    }
                } catch (error) {
                    console.error('收藏操作失败：', error);
                    alert('收藏失败，请检查网络连接');
                }
            });
        });

        // 为删除收藏按钮添加点击事件
        container.querySelectorAll('.delete-btn').forEach((btn, index) => {
            btn.addEventListener('click', async function () {
                const card = this.closest('.history-card'), is_recover = this.classList.contains('active');
                const recordId = card.dataset.id;

                if (confirm(`确定要${is_recover ? '恢复' : '删除'}这条记录吗？`)) {
                    try {
                        const response = await fetch(`/api/history/${recordId}/delete`, {
                            method: 'POST'
                        });

                        if (response.ok) {
                            card.remove();
                            // 如果没有卡片了，显示空提示
                            if (container.querySelectorAll('.history-card').length === 0) {
                                container.innerHTML = '<div class="placeholder">暂无记录</div>';
                            }
                            if (is_recover) {
                                alert('恢复成功');
                            } else {
                                alert('删除成功');
                            }
                        } else {
                            alert('删除失败，请重试');
                        }
                    } catch (error) {
                        console.error('删除操作失败：', error);
                        alert('删除失败，请检查网络连接');
                    }
                }
            });
        });

        function renderHistoryAnswers(answers) {
            let str = ''
            if (!answers || answers.length === 0) {
                str = '<p class="placeholder">没有找到答案</p>';
                return str;
            }

            // 根据答案类型渲染不同的内容
            if (Array.isArray(answers)) {
                // 如果是数组，渲染为列表
                const answersHTML = answers.map(answer => {
                    if (typeof answer === 'object' && answer.expression) {
                        // 如果是解法对象
                        return `
                            <div class="solution-item flag-${answer.flag || 0}">
                                <div class="solution-expression">${answer.expression}</div>
                                <div class="solution-flag flag-${answer.flag || 0}">
                                    ${answer.flag === 1 ? '★' : answer.flag === 2 ? '★★' : ''}
                                </div>
                            </div>
                        `;
                    } else {
                        // 如果是普通文本
                        return `<div class="answer-item">${answer}</div>`;
                    }
                }).join('');
                str = `
                    <div class="answers-container">
                        ${answersHTML}
                    </div>
                `;
            } else if (typeof answers === 'object') {
                // 如果是单个对象
                const answerKeys = Object.keys(answers);
                const answersHTML = answerKeys.map(key => {
                    return `
                        <div class="answer-group">
                            <div class="answer-key">${key}:</div>
                            <div class="answer-value">${answers[key]}</div>
                        </div>
                    `;
                }).join('');

                str = `
                    <h3>答案</h3>
                    <div class="answers-container">
                        ${answersHTML}
                    </div>
                `;
            } else {
                // 如果是单个值
                str = `
                    <h3>答案</h3>
                    <div class="answers-container">
                        <div class="answer-item">${answers}</div>
                    </div>
                `;
            }
            return str;
        }

    }

    // 设置日期输入框的默认值为当前日期
    const today = new Date();
    // 计算三天前的日期
    const threeDaysAgo = new Date();
    threeDaysAgo.setDate(today.getDate() - 3);

    // 设置开始日期输入框的值为三天前
    historyStartDateInput.value = threeDaysAgo.toISOString().split('T')[0];
    historyEndDateInput.value = today.toISOString().split('T')[0];
});