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// TODO Batch by color
 
 
 
    var graphic = require('../../util/graphic');
 
    var quadraticContain = require('zrender/lib/contain/quadratic');
    var lineContain = require('zrender/lib/contain/line');
 
    var LargeLineShape = graphic.extendShape({
        shape: {
            polyline: false,
 
            segs: []
        },
 
        buildPath: function (path, shape) {
            var segs = shape.segs;
            var isPolyline = shape.polyline;
 
            for (var i = 0; i < segs.length; i++) {
                var seg = segs[i];
                if (isPolyline) {
                    path.moveTo(seg[0][0], seg[0][1]);
                    for (var j = 1; j < seg.length; j++) {
                        path.lineTo(seg[j][0], seg[j][1]);
                    }
                }
                else {
                    path.moveTo(seg[0][0], seg[0][1]);
                    if (seg.length > 2) {
                        path.quadraticCurveTo(seg[2][0], seg[2][1], seg[1][0], seg[1][1]);
                    }
                    else {
                        path.lineTo(seg[1][0], seg[1][1]);
                    }
                }
            }
        },
 
        findDataIndex: function (x, y) {
            var shape = this.shape;
            var segs = shape.segs;
            var isPolyline = shape.polyline;
            var lineWidth = Math.max(this.style.lineWidth, 1);
 
            // Not consider transform
            for (var i = 0; i < segs.length; i++) {
                var seg = segs[i];
                if (isPolyline) {
                    for (var j = 1; j < seg.length; j++) {
                        if (lineContain.containStroke(
                            seg[j - 1][0], seg[j - 1][1], seg[j][0], seg[j][1], lineWidth, x, y
                        )) {
                            return i;
                        }
                    }
                }
                else {
                    if (seg.length > 2) {
                        if (quadraticContain.containStroke(
                            seg[0][0], seg[0][1], seg[2][0], seg[2][1], seg[1][0], seg[1][1], lineWidth, x, y
                        )) {
                            return i;
                        }
                    }
                    else {
                        if (lineContain.containStroke(
                            seg[0][0], seg[0][1], seg[1][0], seg[1][1], lineWidth, x, y
                        )) {
                            return i;
                        }
                    }
                }
            }
 
            return -1;
        }
    });
 
    function LargeLineDraw() {
        this.group = new graphic.Group();
 
        this._lineEl = new LargeLineShape();
    }
 
    var largeLineProto = LargeLineDraw.prototype;
 
    /**
     * Update symbols draw by new data
     * @param {module:echarts/data/List} data
     */
    largeLineProto.updateData = function (data) {
        this.group.removeAll();
 
        var lineEl = this._lineEl;
 
        var seriesModel = data.hostModel;
 
        lineEl.setShape({
            segs: data.mapArray(data.getItemLayout),
            polyline: seriesModel.get('polyline')
        });
 
        lineEl.useStyle(
            seriesModel.getModel('lineStyle.normal').getLineStyle()
        );
 
        var visualColor = data.getVisual('color');
        if (visualColor) {
            lineEl.setStyle('stroke', visualColor);
        }
        lineEl.setStyle('fill');
 
        // Enable tooltip
        // PENDING May have performance issue when path is extremely large
        lineEl.seriesIndex = seriesModel.seriesIndex;
        lineEl.on('mousemove', function (e) {
            lineEl.dataIndex = null;
            var dataIndex = lineEl.findDataIndex(e.offsetX, e.offsetY);
            if (dataIndex > 0) {
                // Provide dataIndex for tooltip
                lineEl.dataIndex = dataIndex;
            }
        });
 
        // Add back
        this.group.add(lineEl);
    };
 
    largeLineProto.updateLayout = function (seriesModel) {
        var data = seriesModel.getData();
        this._lineEl.setShape({
            segs: data.mapArray(data.getItemLayout)
        });
    };
 
    largeLineProto.remove = function () {
        this.group.removeAll();
    };
 
    module.exports = LargeLineDraw;