(function () {
    var chartEl = document.getElementById('market-chart');
    var emptyEl = document.getElementById('market-chart-empty');
    var wrapEl = chartEl && chartEl.parentElement;
    var chart = null;
    var currentPeriod = '15m';
    var klineSource = null;
    var streamActive = false;
    var reconnectTimer = null;
    var lastData = null;

    function getSymbol() {
        var hidden = document.getElementById('market-symbol-hidden');
        var input = document.getElementById('market-symbol-input');
        if (hidden && hidden.value) return hidden.value.trim();
        if (input && input.value) return input.value.trim();
        return '';
    }

    function getMarketCodes() {
        return {
            symbol: getSymbol(),
            market_code: (document.getElementById('market-market-code') || {}).value || '',
            sina_code: (document.getElementById('market-sina-code') || {}).value || '',
        };
    }

    function themeColors() {
        var dark = document.documentElement.getAttribute('data-theme') !== 'light';
        return {
            bg: dark ? '#0a0c14' : '#f4f7fc',
            text: dark ? '#a8b0c8' : '#5c6578',
            title: dark ? '#e8eaf6' : '#1a2233',
            grid: dark ? '#1a2038' : '#e2e8f0',
            up: dark ? '#4cd97f' : '#15803d',
            down: dark ? '#ff6b7a' : '#dc2626',
            line: dark ? '#4cc2ff' : '#2563eb',
            area: dark ? 'rgba(76,194,255,0.12)' : 'rgba(37,99,235,0.1)',
            slider: dark ? '#1e2640' : '#cbd5e1',
            sliderFill: dark ? '#4cc2ff' : '#2563eb',
        };
    }

    function isTradingSession() {
        var d = new Date();
        var wd = d.getDay();
        if (wd === 0) return false;
        if (wd === 6 && d.getHours() < 21) return false;
        var t = d.getHours() * 60 + d.getMinutes();
        function inRange(sh, sm, eh, em) {
            return t >= sh * 60 + sm && t < eh * 60 + em;
        }
        if (inRange(9, 0, 11, 30)) return true;
        if (inRange(13, 30, 15, 0)) return true;
        if (inRange(21, 0, 24, 0)) return true;
        if (inRange(0, 0, 2, 30)) return true;
        return false;
    }

    function initChart() {
        if (!chartEl || !window.echarts) return;
        chart = echarts.init(chartEl);
        window.addEventListener('resize', function () {
            if (chart) chart.resize();
        });
        document.addEventListener('click', function (e) {
            if (e.target.closest('[data-theme-pick]')) {
                setTimeout(function () {
                    if (chart && lastData) renderChart(lastData, true);
                }, 100);
            }
        });
    }

    function getDataZoom(c, preserve) {
        var defStart = currentPeriod === 'timeshare' ? 60 : 75;
        var zoom = [
            {
                type: 'inside',
                xAxisIndex: [0, 1],
                start: defStart,
                end: 100,
                zoomOnMouseWheel: true,
                moveOnMouseMove: true,
                moveOnMouseWheel: false,
            },
            {
                type: 'slider',
                xAxisIndex: [0, 1],
                start: defStart,
                end: 100,
                height: 22,
                bottom: 4,
                borderColor: c.grid,
                backgroundColor: c.bg,
                fillerColor: c.area,
                handleStyle: { color: c.sliderFill },
                dataBackground: {
                    lineStyle: { color: c.grid },
                    areaStyle: { color: c.area },
                },
                textStyle: { color: c.text, fontSize: 10 },
            },
        ];
        if (preserve && chart) {
            var opt = chart.getOption();
            if (opt && opt.dataZoom) {
                opt.dataZoom.forEach(function (z, i) {
                    if (zoom[i] && z.start != null && z.end != null) {
                        zoom[i].start = z.start;
                        zoom[i].end = z.end;
                    }
                });
            }
        }
        return zoom;
    }

    function renderChart(data, preserveZoom) {
        if (!chart) return;
        lastData = data;
        var c = themeColors();
        var bars = data.bars || [];
        var times = bars.map(function (b) { return b.time; });
        var isLine = data.chart_type === 'line' || data.period === 'timeshare';
        var dataZoom = getDataZoom(c, preserveZoom);
        var grids = [
            { left: 56, right: 20, top: 44, height: '50%' },
            { left: 56, right: 20, top: '66%', height: '14%' },
        ];

        var base = {
            backgroundColor: c.bg,
            animation: false,
            tooltip: { trigger: 'axis', axisPointer: { type: 'cross' } },
            axisPointer: { link: [{ xAxisIndex: 'all' }] },
            dataZoom: dataZoom,
            grid: grids,
            xAxis: [
                { type: 'category', data: times, gridIndex: 0, axisLabel: { color: c.text, fontSize: 10 }, axisLine: { lineStyle: { color: c.grid } } },
                { type: 'category', data: times, gridIndex: 1, axisLabel: { show: false }, axisLine: { lineStyle: { color: c.grid } } },
            ],
            yAxis: [
                { scale: true, gridIndex: 0, splitLine: { lineStyle: { color: c.grid } }, axisLabel: { color: c.text } },
                { scale: true, gridIndex: 1, splitLine: { show: false }, axisLabel: { color: c.text, fontSize: 10 }, splitNumber: 2 },
            ],
        };

        if (isLine) {
            var closes = bars.map(function (b) { return b.close; });
            var vols = bars.map(function (b) { return b.volume; });
            chart.setOption(Object.assign(base, {
                series: [
                    {
                        name: '价格',
                        type: 'line',
                        data: closes,
                        smooth: true,
                        showSymbol: false,
                        lineStyle: { width: 1.5, color: c.line },
                        areaStyle: { color: c.area },
                        xAxisIndex: 0,
                        yAxisIndex: 0,
                    },
                    {
                        name: '成交量',
                        type: 'bar',
                        data: vols,
                        itemStyle: { color: c.area },
                        xAxisIndex: 1,
                        yAxisIndex: 1,
                    },
                ],
            }), true);
        } else {
            var candle = bars.map(function (b) { return [b.open, b.close, b.low, b.high]; });
            var vols = bars.map(function (b) {
                var up = b.close >= b.open;
                return {
                    value: b.volume,
                    itemStyle: { color: up ? c.up : c.down, opacity: 0.65 },
                };
            });
            chart.setOption(Object.assign(base, {
                tooltip: {
                    trigger: 'axis',
                    axisPointer: { type: 'cross' },
                    formatter: function (params) {
                        var idx = params[0] && params[0].dataIndex;
                        if (idx == null || !bars[idx]) return '';
                        var b = bars[idx];
                        return [
                            b.time,
                            '开 ' + b.open,
                            '高 ' + b.high,
                            '低 ' + b.low,
                            '收 ' + b.close,
                            '量 ' + b.volume,
                        ].join('<br/>');
                    },
                },
                series: [
                    {
                        name: 'K线',
                        type: 'candlestick',
                        data: candle,
                        itemStyle: {
                            color: c.up,
                            color0: c.down,
                            borderColor: c.up,
                            borderColor0: c.down,
                        },
                        xAxisIndex: 0,
                        yAxisIndex: 0,
                    },
                    {
                        name: '成交量',
                        type: 'bar',
                        data: vols,
                        xAxisIndex: 1,
                        yAxisIndex: 1,
                    },
                ],
            }), true);
        }

        var title = (data.chart_symbol || data.symbol || '') + ' · ' + periodLabel(data.period);
        chart.setOption({
            title: { text: title, left: 12, top: 8, textStyle: { color: c.title, fontSize: 13, fontWeight: 600 } },
        });
    }

    function periodLabel(key) {
        var tabs = document.querySelectorAll('.period-tab');
        for (var i = 0; i < tabs.length; i++) {
            if (tabs[i].getAttribute('data-period') === key) return tabs[i].textContent;
        }
        return key;
    }

    function hideEmptyOverlay() {
        if (emptyEl) emptyEl.style.display = '';
        if (wrapEl) wrapEl.classList.add('has-data');
    }

    function showEmptyOverlay(text) {
        if (emptyEl) {
            emptyEl.textContent = text;
            emptyEl.style.display = 'flex';
        }
        if (wrapEl) wrapEl.classList.remove('has-data');
    }

    function setLoading(on) {
        var btn = document.getElementById('market-load-btn');
        if (btn) {
            btn.disabled = on;
            btn.textContent = on ? '连接中…' : '查看';
        }
        if (on) showEmptyOverlay('连接中…');
        else if (lastData) hideEmptyOverlay();
    }

    function updateRefreshHint(disconnected) {
        var el = document.getElementById('market-refresh-hint');
        if (!el) return;
        if (!getSymbol()) {
            el.textContent = '';
            return;
        }
        if (disconnected) {
            el.textContent = 'SSE 连接中断，正在重连…';
            return;
        }
        if (!streamActive) {
            el.textContent = '';
            return;
        }
        var src = lastData && lastData.source === 'local' ? ' · 本地缓存' : '';
        if (isTradingSession()) {
            el.textContent = '交易中 · 后台刷新 · SSE 推送（约1秒）' + src;
        } else {
            el.textContent = 'SSE 推送 · 非交易时段低频刷新' + src;
        }
    }

    function applyQuote(data) {
        var priceEl = document.getElementById('market-quote-price');
        var nameEl = document.getElementById('market-quote-name');
        if (nameEl && data.name) nameEl.textContent = data.name + ' ' + (data.symbol || '');
        if (priceEl) {
            priceEl.textContent = data.price != null ? Number(data.price).toFixed(2) : '—';
        }
    }

    function stopKlineStream() {
        streamActive = false;
        if (reconnectTimer) {
            clearTimeout(reconnectTimer);
            reconnectTimer = null;
        }
        if (klineSource) {
            klineSource.close();
            klineSource = null;
        }
    }

    function scheduleReconnect() {
        if (reconnectTimer) return;
        updateRefreshHint(true);
        reconnectTimer = setTimeout(function () {
            reconnectTimer = null;
            if (getSymbol()) startKlineStream(false);
        }, 3000);
    }

    function startKlineStream(showLoading) {
        stopKlineStream();
        var symbol = getSymbol();
        if (!symbol) {
            alert('请先选择或输入合约代码');
            return;
        }
        if (showLoading) setLoading(true);

        var codes = getMarketCodes();
        var q = 'symbol=' + encodeURIComponent(symbol) +
            '&period=' + encodeURIComponent(currentPeriod);
        if (codes.market_code) q += '&market_code=' + encodeURIComponent(codes.market_code);
        if (codes.sina_code) q += '&sina_code=' + encodeURIComponent(codes.sina_code);

        klineSource = new EventSource('/api/kline/stream?' + q);
        streamActive = true;
        updateRefreshHint(false);

        klineSource.addEventListener('kline', function (e) {
            try {
                var data = JSON.parse(e.data);
                if (!data.bars || !data.bars.length) return;
                hideEmptyOverlay();
                renderChart(data, lastData !== null);
                updateQuoteMeta(data);
                updateRefreshHint(false);
                setLoading(false);
            } catch (err) { /* ignore */ }
        });

        klineSource.addEventListener('quote', function (e) {
            try {
                applyQuote(JSON.parse(e.data));
            } catch (err) { /* ignore */ }
        });

        klineSource.onerror = function () {
            stopKlineStream();
            scheduleReconnect();
        };
    }

    function updateQuoteMeta(data) {
        var meta = document.getElementById('market-quote-meta');
        if (meta) {
            meta.textContent = data.count ? ('共 ' + data.count + ' 根 · ' + periodLabel(data.period)) : '';
        }
        var nameEl = document.getElementById('market-quote-name');
        var hiddenName = document.getElementById('market-symbol-name');
        if (nameEl && !(nameEl.textContent && nameEl.textContent.trim())) {
            nameEl.textContent = (hiddenName && hiddenName.value) || data.symbol || '—';
        }
    }

    function loadKline(showLoading) {
        startKlineStream(showLoading);
    }

    function shiftDataZoom(delta) {
        if (!chart) return;
        var opt = chart.getOption();
        if (!opt || !opt.dataZoom || !opt.dataZoom.length) return;
        var z = opt.dataZoom[0];
        var span = (z.end - z.start) || 20;
        var newSpan = Math.max(5, Math.min(100, span + delta));
        var center = (z.start + z.end) / 2;
        var start = Math.max(0, center - newSpan / 2);
        var end = Math.min(100, center + newSpan / 2);
        if (end - start < newSpan) {
            if (start === 0) end = newSpan;
            else start = end - newSpan;
        }
        chart.dispatchAction({ type: 'dataZoom', start: start, end: end });
    }

    function resetDataZoom() {
        if (!chart) return;
        var start = currentPeriod === 'timeshare' ? 60 : 75;
        chart.dispatchAction({ type: 'dataZoom', start: start, end: 100 });
    }

    function bindPeriodTabs() {
        var tabs = document.getElementById('market-period-tabs');
        if (!tabs) return;
        tabs.addEventListener('click', function (e) {
            var btn = e.target.closest('.period-tab');
            if (!btn) return;
            tabs.querySelectorAll('.period-tab').forEach(function (el) { el.classList.remove('active'); });
            btn.classList.add('active');
            currentPeriod = btn.getAttribute('data-period') || '15m';
            if (getSymbol()) loadKline(true);
        });
    }

    function bindZoomButtons() {
        var zoomIn = document.getElementById('chart-zoom-in');
        var zoomOut = document.getElementById('chart-zoom-out');
        var zoomReset = document.getElementById('chart-zoom-reset');
        if (zoomIn) zoomIn.addEventListener('click', function () { shiftDataZoom(-12); });
        if (zoomOut) zoomOut.addEventListener('click', function () { shiftDataZoom(12); });
        if (zoomReset) zoomReset.addEventListener('click', resetDataZoom);
    }

    document.addEventListener('DOMContentLoaded', function () {
        initChart();
        bindPeriodTabs();
        bindZoomButtons();

        var active = document.querySelector('.period-tab.active');
        if (active) currentPeriod = active.getAttribute('data-period') || '15m';

        var loadBtn = document.getElementById('market-load-btn');
        if (loadBtn) loadBtn.addEventListener('click', function () { loadKline(true); });

        var hidden = document.getElementById('market-symbol-hidden');
        var input = document.getElementById('market-symbol-input');
        if (hidden && hidden.value) {
            if (input && !input.value) input.value = hidden.value;
            loadKline(true);
        } else {
            updateRefreshHint(false);
        }

        window.addEventListener('beforeunload', stopKlineStream);
    });
})();