(function () {
    var chartEl = document.getElementById('market-chart');
    var emptyEl = document.getElementById('market-chart-empty');
    var wrapEl = document.getElementById('market-chart-wrap');
    var chart = null;
    var candleSeries = null;
    var volumeSeries = null;
    var areaSeries = null;
    var ma21Series = null;
    var ma55Series = null;
    var prevCloseLine = null;
    var resizeObs = null;
    var currentPeriod = '15m';
    var currentChartMode = '';
    var klineSource = null;
    var streamActive = false;
    var reconnectTimer = null;
    var lastData = null;
    var lastPrevClose = null;
    var chartOpts = { prevClose: false, ma: false, gapDay: false };
    var followingLatest = true;
    var DEFAULT_VISIBLE_BARS = 80;

    var PERIOD_SECONDS = {
        timeshare: 60,
        '1m': 60,
        '2m': 120,
        '5m': 300,
        '15m': 900,
        '1h': 3600,
        '2h': 7200,
        '4h': 14400,
        d: 86400,
        w: 604800,
    };

    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' : '#ffffff',
            text: dark ? '#a8b0c8' : '#5c6578',
            grid: dark ? '#1e2640' : '#e8edf5',
            up: dark ? '#26a69a' : '#089981',
            down: dark ? '#ef5350' : '#f23645',
            line: dark ? '#4cc2ff' : '#2962ff',
            areaTop: dark ? 'rgba(76,194,255,0.28)' : 'rgba(41,98,255,0.22)',
            ma21: dark ? '#ffb347' : '#f7931a',
            ma55: dark ? '#c084fc' : '#7c3aed',
            prevClose: dark ? '#fbbf24' : '#b45309',
        };
    }

    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 barUnixTime(bar) {
        if (bar.timestamp) return Math.floor(bar.timestamp / 1000);
        if (bar.time) {
            var d = new Date(String(bar.time).replace(' ', 'T'));
            if (!isNaN(d.getTime())) return Math.floor(d.getTime() / 1000);
        }
        return null;
    }

    function prepareBars(bars, periodKey) {
        var out = [];
        var gapDay = chartOpts.gapDay;
        var seen = {};
        var gapBase = null;
        var step = PERIOD_SECONDS[periodKey] || 60;
        for (var i = 0; i < bars.length; i++) {
            var b = bars[i];
            var o = Number(b.open);
            var h = Number(b.high);
            var l = Number(b.low);
            var c = Number(b.close);
            if (!isFinite(o) || !isFinite(c)) continue;
            if (!isFinite(h)) h = Math.max(o, c);
            if (!isFinite(l)) l = Math.min(o, c);
            h = Math.max(h, o, c);
            l = Math.min(l, o, c);
            var t;
            if (gapDay) {
                if (gapBase == null) {
                    gapBase = b.timestamp ? Math.floor(b.timestamp / 1000) : 946684800;
                }
                t = gapBase + out.length * step;
            } else {
                t = barUnixTime(b);
            }
            if (t == null || seen[t]) continue;
            seen[t] = true;
            out.push({
                time: t,
                open: o,
                high: h,
                low: l,
                close: c,
                volume: Number(b.volume) || 0,
                rawTime: b.time,
            });
        }
        return out;
    }

    function calcMA(period, bars) {
        var result = [];
        for (var i = 0; i < bars.length; i++) {
            if (i < period - 1) continue;
            var sum = 0;
            for (var j = 0; j < period; j++) sum += bars[i - j].close;
            result.push({ time: bars[i].time, value: +(sum / period).toFixed(4) });
        }
        return result;
    }

    function destroyChart() {
        if (resizeObs) {
            resizeObs.disconnect();
            resizeObs = null;
        }
        if (chart) {
            chart.remove();
            chart = null;
        }
        candleSeries = null;
        volumeSeries = null;
        areaSeries = null;
        ma21Series = null;
        ma55Series = null;
        prevCloseLine = null;
        currentChartMode = '';
    }

    function buildChart(mode) {
        destroyChart();
        if (!chartEl || !window.LightweightCharts) return;
        var c = themeColors();
        var w = chartEl.clientWidth || 600;
        var h = chartEl.clientHeight || 400;
        chart = LightweightCharts.createChart(chartEl, {
            width: w,
            height: h,
            layout: {
                background: { type: 'solid', color: c.bg },
                textColor: c.text,
                fontSize: 11,
            },
            grid: {
                vertLines: { color: c.grid, style: 1 },
                horzLines: { color: c.grid, style: 1 },
            },
            crosshair: {
                mode: LightweightCharts.CrosshairMode.Normal,
                vertLine: { width: 1, color: c.text, style: 2, labelBackgroundColor: c.grid },
                horzLine: { width: 1, color: c.text, style: 2, labelBackgroundColor: c.grid },
            },
            rightPriceScale: {
                borderColor: c.grid,
                scaleMargins: mode === 'line' ? { top: 0.08, bottom: 0.08 } : { top: 0.05, bottom: 0.22 },
            },
            timeScale: {
                borderColor: c.grid,
                timeVisible: true,
                secondsVisible: false,
                rightOffset: 8,
                barSpacing: 10,
                minBarSpacing: 4,
                fixLeftEdge: false,
                fixRightEdge: false,
            },
            handleScroll: { mouseWheel: true, pressedMouseMove: true, horzTouchDrag: true, vertTouchDrag: true },
            handleScale: { axisPressedMouseMove: true, mouseWheel: true, pinch: true },
            localization: { locale: 'zh-CN' },
        });

        if (mode === 'line') {
            areaSeries = chart.addAreaSeries({
                lineColor: c.line,
                topColor: c.areaTop,
                bottomColor: 'rgba(0,0,0,0)',
                lineWidth: 2,
                priceLineVisible: false,
                lastValueVisible: true,
            });
        } else {
            candleSeries = chart.addCandlestickSeries({
                upColor: c.up,
                downColor: c.down,
                borderVisible: true,
                borderUpColor: c.up,
                borderDownColor: c.down,
                wickUpColor: c.up,
                wickDownColor: c.down,
                priceLineVisible: false,
                lastValueVisible: true,
            });
            volumeSeries = chart.addHistogramSeries({
                priceFormat: { type: 'volume' },
                priceScaleId: 'volume',
                lastValueVisible: false,
                priceLineVisible: false,
            });
            chart.priceScale('volume').applyOptions({
                scaleMargins: { top: 0.82, bottom: 0 },
                borderVisible: false,
            });
            if (chartOpts.ma) {
                ma21Series = chart.addLineSeries({
                    color: c.ma21,
                    lineWidth: 1,
                    priceLineVisible: false,
                    lastValueVisible: false,
                    crosshairMarkerVisible: false,
                });
                ma55Series = chart.addLineSeries({
                    color: c.ma55,
                    lineWidth: 1,
                    priceLineVisible: false,
                    lastValueVisible: false,
                    crosshairMarkerVisible: false,
                });
            }
        }

        chart.timeScale().subscribeVisibleLogicalRangeChange(function () {
            if (!chart) return;
            var range = chart.timeScale().getVisibleLogicalRange();
            if (!range || !lastData || !lastData.preparedBars) return;
            var total = lastData.preparedBars.length;
            followingLatest = range.to >= total - 2;
        });

        resizeObs = new ResizeObserver(function () {
            if (!chart || !chartEl) return;
            chart.applyOptions({ width: chartEl.clientWidth, height: chartEl.clientHeight });
        });
        resizeObs.observe(chartEl);
        currentChartMode = mode;
    }

    function applyPrevCloseLine(price) {
        if (!candleSeries || currentChartMode !== 'candle') return;
        if (prevCloseLine) {
            candleSeries.removePriceLine(prevCloseLine);
            prevCloseLine = null;
        }
        if (!chartOpts.prevClose || price == null || !isFinite(Number(price))) return;
        var c = themeColors();
        prevCloseLine = candleSeries.createPriceLine({
            price: Number(price),
            color: c.prevClose,
            lineWidth: 1,
            lineStyle: LightweightCharts.LineStyle.Dashed,
            axisLabelVisible: true,
            title: '昨收',
        });
    }

    function setVisibleRange(prepared, preserve) {
        if (!chart || !prepared.length) return;
        var ts = chart.timeScale();
        if (preserve && followingLatest) {
            var span = DEFAULT_VISIBLE_BARS;
            try {
                var cur = ts.getVisibleLogicalRange();
                if (cur) span = Math.max(20, cur.to - cur.from);
            } catch (e) { /* ignore */ }
            ts.setVisibleLogicalRange({
                from: Math.max(0, prepared.length - span),
                to: prepared.length + 4,
            });
            return;
        }
        if (preserve) return;
        var show = Math.min(DEFAULT_VISIBLE_BARS, prepared.length);
        ts.setVisibleLogicalRange({
            from: Math.max(0, prepared.length - show),
            to: prepared.length + 4,
        });
    }

    function renderChart(data, preserveRange) {
        if (!chartEl || !window.LightweightCharts) return;
        lastData = data;
        if (data.prev_close != null) lastPrevClose = data.prev_close;

        var isLine = data.chart_type === 'line' || data.period === 'timeshare';
        var mode = isLine ? 'line' : 'candle';
        if (!chart || currentChartMode !== mode) buildChart(mode);
        if (!chart) return;

        var prepared = prepareBars(data.bars || [], data.period || currentPeriod);
        data.preparedBars = prepared;
        if (!prepared.length) return;

        if (mode === 'line') {
            areaSeries.setData(prepared.map(function (b) {
                return { time: b.time, value: b.close };
            }));
        } else {
            candleSeries.setData(prepared.map(function (b) {
                return { time: b.time, open: b.open, high: b.high, low: b.low, close: b.close };
            }));
            volumeSeries.setData(prepared.map(function (b) {
                var up = b.close >= b.open;
                var c = themeColors();
                return {
                    time: b.time,
                    value: b.volume,
                    color: up ? c.up : c.down,
                };
            }));
            if (chartOpts.ma && ma21Series && ma55Series) {
                ma21Series.setData(calcMA(21, prepared));
                ma55Series.setData(calcMA(55, prepared));
            }
            applyPrevCloseLine(lastPrevClose != null ? lastPrevClose : data.prev_close);
        }

        setVisibleRange(prepared, !!preserveRange);
    }

    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 (wrapEl) wrapEl.classList.add('has-data');
    }

    function showEmptyOverlay(text) {
        if (emptyEl) emptyEl.textContent = text;
        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 (!wrapEl) return;
        if (on && !lastData) {
            wrapEl.classList.add('loading');
            showEmptyOverlay('请选择合约并点击「查看」');
        } else {
            wrapEl.classList.remove('loading');
            if (lastData) hideEmptyOverlay();
        }
    }

    function klineSourceLabel(src) {
        if (src === 'ctp') return 'CTP';
        if (src === 'ctp+remote') return '新浪+CTP';
        if (src === 'local') return '本地缓存';
        return '新浪';
    }

    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 = '';
        if (lastData && lastData.source) {
            src = ' · ' + klineSourceLabel(lastData.source);
        }
        if (isTradingSession()) {
            el.textContent = 'TradingView 图表 · 交易中 SSE 推送' + src;
        } else {
            el.textContent = 'TradingView 图表 · 非交易时段低频刷新' + src;
        }
    }

    function updatePrevCloseDisplay(val) {
        var prevEl = document.getElementById('market-quote-prev');
        if (!prevEl) return;
        if (val != null && !isNaN(Number(val))) {
            prevEl.textContent = '昨收 ' + Number(val).toFixed(2);
        } else {
            prevEl.textContent = '';
        }
    }

    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) : '—';
        }
        if (data.quote_source && lastData) {
            updateQuoteMeta(Object.assign({}, lastData, { quote_source: data.quote_source }));
        }
        if (data.prev_close != null) {
            lastPrevClose = data.prev_close;
            updatePrevCloseDisplay(data.prev_close);
            if (chartOpts.prevClose && lastData) {
                applyPrevCloseLine(data.prev_close);
            }
        }
    }

    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;
        followingLatest = 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);
                if (data.prev_close != null) updatePrevCloseDisplay(data.prev_close);
                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) {
            var parts = [];
            if (data.count) parts.push('共 ' + data.count + ' 根 · ' + periodLabel(data.period));
            if (data.source) parts.push('K线 ' + klineSourceLabel(data.source));
            if (data.quote_source) {
                parts.push('报价 ' + (data.quote_source === 'ctp' ? 'CTP' : '新浪'));
            }
            meta.textContent = parts.join(' · ');
        }
        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 ts = chart.timeScale();
        var range = ts.getVisibleLogicalRange();
        if (!range) return;
        var span = range.to - range.from;
        var newSpan = Math.max(15, span + delta);
        var center = (range.from + range.to) / 2;
        ts.setVisibleLogicalRange({
            from: center - newSpan / 2,
            to: center + newSpan / 2,
        });
    }

    function resetDataZoom() {
        if (!chart || !lastData || !lastData.preparedBars) return;
        followingLatest = true;
        setVisibleRange(lastData.preparedBars, false);
    }

    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';
            followingLatest = true;
            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(-20); });
        if (zoomOut) zoomOut.addEventListener('click', function () { shiftDataZoom(20); });
        if (zoomReset) zoomReset.addEventListener('click', resetDataZoom);
    }

    function bindChartOptions() {
        var prevCb = document.getElementById('chart-opt-prev-close');
        var maCb = document.getElementById('chart-opt-ma');
        var gapCb = document.getElementById('chart-opt-gap-day');
        if (prevCb) {
            prevCb.addEventListener('change', function () {
                chartOpts.prevClose = prevCb.checked;
                if (lastData) {
                    applyPrevCloseLine(lastPrevClose != null ? lastPrevClose : lastData.prev_close);
                }
            });
        }
        if (maCb) {
            maCb.addEventListener('change', function () {
                chartOpts.ma = maCb.checked;
                if (lastData) {
                    destroyChart();
                    renderChart(lastData, false);
                }
            });
        }
        if (gapCb) {
            gapCb.addEventListener('change', function () {
                chartOpts.gapDay = gapCb.checked;
                followingLatest = true;
                if (lastData) renderChart(lastData, false);
            });
        }
    }

    document.addEventListener('DOMContentLoaded', function () {
        if (!window.LightweightCharts) {
            if (emptyEl) emptyEl.textContent = '图表库加载失败，请刷新页面';
            return;
        }
        bindPeriodTabs();
        bindZoomButtons();
        bindChartOptions();

        document.addEventListener('click', function (e) {
            if (e.target.closest('[data-theme-pick]') && lastData) {
                setTimeout(function () {
                    destroyChart();
                    renderChart(lastData, false);
                }, 80);
            }
        });

        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 (input) {
            input.addEventListener('symbol-selected', function () {
                lastPrevClose = null;
                lastData = null;
                destroyChart();
                updatePrevCloseDisplay(null);
                loadKline(true);
            });
        }
        if (hidden && hidden.value) {
            if (input && !input.value) input.value = hidden.value;
            loadKline(true);
        } else {
            updateRefreshHint(false);
        }

        window.addEventListener('beforeunload', function () {
            stopKlineStream();
            destroyChart();
        });
    });
})();