// repeatability.js - 重复性测试相关功能

// 重复性测试时间数组
let repeatabilityTimes = [];

// 图表相关变量
let ctx = null;
let chartInstance = null;

// 初始化重复性图表
function initRepeatabilityChart() {
    ctx = document.getElementById('lineChart').getContext('2d');
}

// 在页面加载完成后初始化图表
document.addEventListener('DOMContentLoaded', function() {
    initRepeatabilityChart();
});

// 更新重复性输入框的占位符
function updateRepeatabilityInputPlaceholders() {
    document.querySelectorAll('#repeatability-inputs input[type="number"]').forEach((input, index) => {
        input.placeholder = `测量值 ${index + 1}`;
    });
}

// 更新重复性输入框的删除按钮
function updateRepeatabilityDeleteButtons() {
    const repeatabilityInputs = document.querySelectorAll('#repeatability-inputs .input-row');
    repeatabilityInputs.forEach((row, index) => {
        const deleteBtn = row.querySelector('.delete-btn');
        if (deleteBtn) {
            deleteBtn.style.display = index < 6 ? 'none' : 'inline';
        }
    });
}

// 重复性测试函数
function addRepeatabilityInput() {
    const container = document.getElementById('repeatability-inputs');
    const newIndex = container.children.length + 1;
    const row = createInputRow(newIndex, 'repeatability', recordTimeAndCalculateRepeatability, deleteRepeatabilityInput);
    container.appendChild(row);
    updateRepeatabilityInputPlaceholders();
}

function deleteRepeatabilityInput(btn) {
    const row = btn.parentNode;
    const container = row.parentNode;
    const index = Array.from(container.children).indexOf(row);

    // 移除对应的时间记录
    repeatabilityTimes.splice(index, 1);

    // 移除输入行
    container.removeChild(row);

    // 更新剩余输入行的索引
    const rows = container.querySelectorAll('.input-row');
    rows.forEach((row, i) => {
        const timeSpan = row.querySelector(`span[id^="repeatability-time-text-"]`);
        const input = row.querySelector(`input[id^="repeatability-value-"]`);

        // 更新ID和文本
        const newIndex = i + 1;
        timeSpan.id = `repeatability-time-text-${newIndex}`;
        input.id = `repeatability-value-${newIndex}`;

        // 如果有保存的时间，则显示时间，否则显示索引
        if (repeatabilityTimes[i]) {
            timeSpan.textContent = `${repeatabilityTimes[i]}: `;
        } else {
            timeSpan.textContent = `${newIndex}: `;
        }

        // 更新输入事件
        input.oninput = function() { recordTimeAndCalculateRepeatability(newIndex); };
    });

    updateRepeatabilityInputPlaceholders();
    calculateRepeatability();
    saveRepeatabilityData();
}

function recordTimeAndCalculateRepeatability(index) {
    recordTimeAndCalculate('repeatability', index, repeatabilityTimes, calculateRepeatability);
}

function calculateRepeatability() {
    const values = getNumericInputs('#repeatability-inputs input[type="number"]');

    if (values.length >= 2) {
        // 计算统计量
        const max = Math.max(...values);
        const min = Math.min(...values);
        const range = max - min;
        const mean = values.reduce((sum, val) => sum + val, 0) / values.length;

        // 计算方差和标准差
        const variance = values.reduce((sum, val) => sum + Math.pow(val - mean, 2), 0) / values.length;
        const stdDev = Math.sqrt(variance);
        const rsd = (stdDev / mean) * 100; // 相对标准偏差，以百分比表示

        // 更新结果显示
        updateResultDisplay('range', range);
        updateResultDisplay('mean', mean);
        updateResultDisplay('variance', variance);
        updateResultDisplay('stdDev', stdDev);
        updateResultDisplay('rsd', rsd);

        // 更新图表
        updateRepeatabilityChart(values);
    } else {
        // 清空结果显示
        document.querySelectorAll('#repeatability .result-item span').forEach(span => {
            span.innerText = '-';
        });

        // 清空图表
        if (chartInstance) {
            chartInstance.data.labels = [];
            chartInstance.data.datasets[0].data = [];
            chartInstance.update();
        }
    }
}

function updateRepeatabilityChart(values) {
    // 创建标签（1, 2, 3, ...）
    const labels = Array.from({length: values.length}, (_, i) => i + 1);

    // 使用通用图表创建函数
    chartInstance = createOrUpdateChart(chartInstance, ctx, labels, values, '重复性');
}

function saveRepeatabilityData() {
    collectAndSaveData('#repeatability-inputs input[type="number"]', 'repeatability-time-text', {
        range: 'range',
        mean: 'mean',
        variance: 'variance',
        stdDev: 'stdDev',
        rsd: 'rsd'
    }, 'repeatabilityData');
}