let currentStudent = null;

// 随机点名
document.getElementById('randomBtn').addEventListener('click', function() {
    fetch('/random_pick')
        .then(response => response.json())
        .then(data => {
            if (data.error) {
                alert(data.error);
                return;
            }
            
            displayStudent(data);
            currentStudent = data;
            document.getElementById('scoreControls').style.display = 'block';
        })
        .catch(error => {
            console.error('Error:', error);
            alert('点名失败，请重试');
        });
});

// 顺序点名
document.getElementById('sequentialBtn').addEventListener('click', function() {
    fetch('/sequential_pick')
        .then(response => response.json())
        .then(data => {
            if (data.error) {
                alert(data.error);
                return;
            }
            
            displayStudent(data);
            currentStudent = data;
            document.getElementById('scoreControls').style.display = 'block';
        })
        .catch(error => {
            console.error('Error:', error);
            alert('点名失败，请重试');
        });
});

// 显示学生信息
function displayStudent(student) {
    const display = document.getElementById('studentDisplay');
    display.innerHTML = `
        <div class="student-info">
            <h2>${student.name}</h2>
            <p>学号：${student.student_id}</p>
            <p>当前积分：${student.score}</p>
            <p>被点名次数：${student.call_count}</p>
        </div>
    `;
}

// 更新积分
function updateScore(scoreChange) {
    if (!currentStudent) {
        alert('请先点名');
        return;
    }
    
    fetch('/update_score', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify({
            student_id: currentStudent.student_id,
            score_change: scoreChange
        })
    })
    .then(response => response.json())
    .then(data => {
        if (data.success) {
            alert('积分更新成功！');
            // 更新显示
            currentStudent.score += scoreChange;
            displayStudent(currentStudent);
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('积分更新失败');
    });
}

// 导入Excel
document.getElementById('importBtn').addEventListener('click', function() {
    const fileInput = document.getElementById('excelFile');
    const file = fileInput.files[0];
    
    if (!file) {
        alert('请选择Excel文件');
        return;
    }
    
    const formData = new FormData();
    formData.append('file', file);
    
    fetch('/import_excel', {
        method: 'POST',
        body: formData
    })
    .then(response => response.json())
    .then(data => {
        const messageDiv = document.getElementById('importMessage');
        if (data.success) {
            messageDiv.textContent = data.message;
            messageDiv.className = 'success';
        } else {
            messageDiv.textContent = data.error;
            messageDiv.className = 'error';
        }
    })
    .catch(error => {
        console.error('Error:', error);
        alert('导入失败');
    });
});

// 导出数据
document.getElementById('exportBtn').addEventListener('click', function() {
    window.open('/export_data', '_blank');
});

// 查看排名
document.getElementById('rankingBtn').addEventListener('click', function() {
    fetch('/get_ranking')
        .then(response => response.json())
        .then(data => {
            displayRanking(data);
        })
        .catch(error => {
            console.error('Error:', error);
            alert('获取排名失败');
        });
});

// 显示排名
function displayRanking(rankingData) {
    const rankingList = document.getElementById('rankingList');
    const rankingDisplay = document.getElementById('rankingDisplay');
    
    if (rankingData.length === 0) {
        rankingList.innerHTML = '<p>暂无数据</p>';
    } else {
        rankingList.innerHTML = rankingData.map((student, index) => `
            <div class="ranking-item">
                <span class="ranking-number">第${index + 1}名</span>
                <span>${student.name}</span>
                <span>积分：${student.score}</span>
                <span>点名：${student.call_count}次</span>
            </div>
        `).join('');
    }
    
    rankingDisplay.style.display = 'block';
}