/* chart_view.js — split from chart.js */
function updateChart() {
    // 只显示旋转加载图标
    $('#refreshLoadingSpinner').show();
    
    // 获取参数
    const dataSource = $('#dataSource').val() || 'crypto';
    let symbol;
    if (dataSource === 'crypto') {
        symbol = $('#symbol').val() || 'BTC/USDT:USDT';
    } else {
        symbol = $('#astockSymbol').val() || '000001';
    }
    
    const timeframe = $('#timeframe').val() || window.DEFAULT_MAIN_TIMEFRAME || '5m';
    const timezone = $('#timezone').val() || 'Asia/Shanghai';
    const elementTimeframe = $('#elementTimeframe').val() || window.DEFAULT_ELEMENT_TIMEFRAME || '1m';
    const subSubTimeframe = $('#subSubTimeframe').val() || '';
    
    // 确保时区参数有效
    console.log('更新图表使用时区:', timezone);
    console.log('数据源:', dataSource, '交易对/股票:', symbol);
    
    // 如果symbol为空，不发送请求
    if (!symbol) {
        console.error('交易对/股票代码不能为空');
        $('#refreshLoadingSpinner').hide();
        return;
    }
    
    console.log(`更新图表: symbol=${symbol}, timeframe=${timeframe}, elementTimeframe=${elementTimeframe}, timezone=${timezone}`);
    
    // 获取开始和结束时间（如果已设置）
    let startTimeMs = null;
    let endTimeMs = null;
    
    if ($('#start_time').val()) {
        startTimeMs = new Date($('#start_time').val()).getTime();
    }
    
    if ($('#end_time').val()) {
        endTimeMs = new Date($('#end_time').val()).getTime();
    }
    
    // 发送请求
    const requestId = ++lastRequestId; // 标记本次请求
    $.ajax({
        url: '/api/analyze',
        data: {
            symbol: symbol,
            timeframe: timeframe,
            timezone: timezone,
            element_timeframe: elementTimeframe,
            sub_sub_timeframe: subSubTimeframe || undefined,
            start_time: startTimeMs,
            end_time: endTimeMs,
            elements_only: false,
            zone_kl_lines: parseInt($('#zoneKlLines').val()) || 1000,
            include_structure_zones: $('#showMainStructureZone').is(':checked') ? 1 : 0
        },
        success: function(data) {
            // 隐藏加载图标
            $('#refreshLoadingSpinner').hide();

            // 忽略过期响应
            if (requestId !== lastRequestId) {
                return;
            }

            // 保存当前数据
            if (currentData) {
                // 覆盖前断开旧引用，帮助GC尽快回收
                delete currentData.original_kline_data;
                delete currentData.original_macd;
            }
            currentData = data;
            
            refreshChart(data);
        },
        error: function(jqXHR, textStatus, errorThrown) {
            // 隐藏加载图标
            $('#refreshLoadingSpinner').hide();
            
            // 显示错误信息
            console.error('加载数据失败:', errorThrown);
            alert('加载数据失败: ' + (jqXHR.responseJSON?.error || errorThrown));
        }
    });
}
function captureChartViewState(chart) {
    if (!chart || !chart.timeScale) return null;
    const ts = chart.timeScale();
    const tsOptions = ts.options ? ts.options() : {};
    return {
        barSpacing: tsOptions.barSpacing,
        rightOffset: tsOptions.rightOffset,
        scrollPosition: ts.scrollPosition ? ts.scrollPosition() : null,
        visibleRange: ts.getVisibleRange ? ts.getVisibleRange() : null,
        logicalRange: ts.getVisibleLogicalRange ? ts.getVisibleLogicalRange() : null
    };
}

function restoreChartViewState(charts, viewState) {
    if (!viewState || !Array.isArray(charts) || charts.length === 0) return;
    const validCharts = charts.filter(c => c && c.timeScale);
    if (validCharts.length === 0) return;

    validCharts.forEach(c => {
        try {
            const optionsPatch = {};
            if (typeof viewState.barSpacing === 'number') optionsPatch.barSpacing = viewState.barSpacing;
            if (typeof viewState.rightOffset === 'number') optionsPatch.rightOffset = viewState.rightOffset;
            if (Object.keys(optionsPatch).length) {
                c.timeScale().applyOptions(optionsPatch);
            }
        } catch (e) {}
    });

    let restored = false;

    // 优先按逻辑范围恢复（对新数据更稳健）
    if (viewState.logicalRange && viewState.logicalRange.from !== undefined && viewState.logicalRange.to !== undefined) {
        validCharts.forEach(c => {
            try {
                c.timeScale().setVisibleLogicalRange(viewState.logicalRange);
                restored = true;
            } catch (e) {}
        });
    }

    // 逻辑范围失败时，回退到时间可见范围
    if (!restored && viewState.visibleRange && viewState.visibleRange.from !== undefined && viewState.visibleRange.to !== undefined) {
        validCharts.forEach(c => {
            try {
                c.timeScale().setVisibleRange(viewState.visibleRange);
                restored = true;
            } catch (e) {}
        });
    }

    // 最后回退到滚动位置
    if (!restored && typeof viewState.scrollPosition === 'number') {
        validCharts.forEach(c => {
            try { c.timeScale().scrollToPosition(viewState.scrollPosition, false); } catch (e) {}
        });
    }
}
// 初始化图表