import {__DEV__} from '../../config';
import * as echarts from '../../echarts';
import * as zrUtil from 'zrender/src/core/util';
import * as graphic from '../../util/graphic';
import {setLabel} from './helper';
import Model from '../../model/Model';
import barItemStyle from './barItemStyle';


var BAR_BORDER_WIDTH_QUERY = ['itemStyle', 'normal', 'barBorderWidth'];

// FIXME
// Just for compatible with ec2.
zrUtil.extend(Model.prototype, barItemStyle);

export default echarts.extendChartView({

    type: 'bar',

    render: function (seriesModel, ecModel, api) {
        var coordinateSystemType = seriesModel.get('coordinateSystem');

        if (coordinateSystemType === 'cartesian2d'
            || coordinateSystemType === 'polar'
        ) {
            this._render(seriesModel, ecModel, api);
        }
        else if (__DEV__) {
            console.warn('Only cartesian2d and polar supported for bar.');
        }

        return this.group;
    },

    dispose: zrUtil.noop,

    _render: function (seriesModel, ecModel, api) {
        var group = this.group;
        var data = seriesModel.getData();
        var oldData = this._data;

        var coord = seriesModel.coordinateSystem;
        var baseAxis = coord.getBaseAxis();
        var isHorizontalOrRadial;

        if (coord.type === 'cartesian2d') {
            isHorizontalOrRadial = baseAxis.isHorizontal();
        }
        else if (coord.type === 'polar') {
            isHorizontalOrRadial = baseAxis.dim === 'angle';
        }

        var animationModel = seriesModel.isAnimationEnabled() ? seriesModel : null;

        data.diff(oldData)
            .add(function (dataIndex) {
                if (!data.hasValue(dataIndex)) {
                    return;
                }

                var itemModel = data.getItemModel(dataIndex);
                var layout = getLayout[coord.type](data, dataIndex, itemModel);
                var el = elementCreator[coord.type](
                    data, dataIndex, itemModel, layout, isHorizontalOrRadial, animationModel
                );
                data.setItemGraphicEl(dataIndex, el);
                group.add(el);

                updateStyle(
                    el, data, dataIndex, itemModel, layout,
                    seriesModel, isHorizontalOrRadial, coord.type === 'polar'
                );
            })
            .update(function (newIndex, oldIndex) {
                var el = oldData.getItemGraphicEl(oldIndex);

                if (!data.hasValue(newIndex)) {
                    group.remove(el);
                    return;
                }

                var itemModel = data.getItemModel(newIndex);
                var layout = getLayout[coord.type](data, newIndex, itemModel);

                if (el) {
                    graphic.updateProps(el, {shape: layout}, animationModel, newIndex);
                }
                else {
                    el = elementCreator[coord.type](
                        data, newIndex, itemModel, layout, isHorizontalOrRadial, animationModel, true
                    );
                }

                data.setItemGraphicEl(newIndex, el);
                // Add back
                group.add(el);

                updateStyle(
                    el, data, newIndex, itemModel, layout,
                    seriesModel, isHorizontalOrRadial, coord.type === 'polar'
                );
            })
            .remove(function (dataIndex) {
                var el = oldData.getItemGraphicEl(dataIndex);
                if (coord.type === 'cartesian2d') {
                    el && removeRect(dataIndex, animationModel, el);
                }
                else {
                    el && removeSector(dataIndex, animationModel, el);
                }
            })
            .execute();

        this._data = data;
    },

    remove: function (ecModel, api) {
        var group = this.group;
        var data = this._data;
        if (ecModel.get('animation')) {
            if (data) {
                data.eachItemGraphicEl(function (el) {
                    if (el.type === 'sector') {
                        removeSector(el.dataIndex, ecModel, el);
                    }
                    else {
                        removeRect(el.dataIndex, ecModel, el);
                    }
                });
            }
        }
        else {
            group.removeAll();
        }
    }
});

var elementCreator = {

    cartesian2d: function (
        data, dataIndex, itemModel, layout, isHorizontal,
        animationModel, isUpdate
    ) {
        var rect = new graphic.Rect({shape: zrUtil.extend({}, layout)});

        // Animation
        if (animationModel) {
            var rectShape = rect.shape;
            var animateProperty = isHorizontal ? 'height' : 'width';
            var animateTarget = {};
            rectShape[animateProperty] = 0;
            animateTarget[animateProperty] = layout[animateProperty];
            graphic[isUpdate ? 'updateProps' : 'initProps'](rect, {
                shape: animateTarget
            }, animationModel, dataIndex);
        }

        return rect;
    },

    polar: function (
        data, dataIndex, itemModel, layout, isRadial,
        animationModel, isUpdate
    ) {
        var sector = new graphic.Sector({shape: zrUtil.extend({}, layout)});

        // Animation
        if (animationModel) {
            var sectorShape = sector.shape;
            var animateProperty = isRadial ? 'r' : 'endAngle';
            var animateTarget = {};
            sectorShape[animateProperty] = isRadial ? 0 : layout.startAngle;
            animateTarget[animateProperty] = layout[animateProperty];
            graphic[isUpdate ? 'updateProps' : 'initProps'](sector, {
                shape: animateTarget
            }, animationModel, dataIndex);
        }

        return sector;
    }
};

function removeRect(dataIndex, animationModel, el) {
    // Not show text when animating
    el.style.text = null;
    graphic.updateProps(el, {
        shape: {
            width: 0
        }
    }, animationModel, dataIndex, function () {
        el.parent && el.parent.remove(el);
    });
}

function removeSector(dataIndex, animationModel, el) {
    // Not show text when animating
    el.style.text = null;
    graphic.updateProps(el, {
        shape: {
            r: el.shape.r0
        }
    }, animationModel, dataIndex, function () {
        el.parent && el.parent.remove(el);
    });
}

var getLayout = {
    cartesian2d: function (data, dataIndex, itemModel) {
        var layout = data.getItemLayout(dataIndex);
        var fixedLineWidth = getLineWidth(itemModel, layout);

        // fix layout with lineWidth
        var signX = layout.width > 0 ? 1 : -1;
        var signY = layout.height > 0 ? 1 : -1;
        return {
            x: layout.x + signX * fixedLineWidth / 2,
            y: layout.y + signY * fixedLineWidth / 2,
            width: layout.width - signX * fixedLineWidth,
            height: layout.height - signY * fixedLineWidth
        };
    },

    polar: function (data, dataIndex, itemModel) {
        var layout = data.getItemLayout(dataIndex);
        return {
            cx: layout.cx,
            cy: layout.cy,
            r0: layout.r0,
            r: layout.r,
            startAngle: layout.startAngle,
            endAngle: layout.endAngle
        };
    }
};

function updateStyle(
    el, data, dataIndex, itemModel, layout, seriesModel, isHorizontal, isPolar
) {
    var color = data.getItemVisual(dataIndex, 'color');
    var opacity = data.getItemVisual(dataIndex, 'opacity');
    var borderColor = data.getItemVisual(dataIndex, 'borderColor');
    var shadowColor = data.getItemVisual(dataIndex, 'shadowColor');
    var itemStyleModel = itemModel.getModel('itemStyle.normal');
    var hoverStyle = itemModel.getModel('itemStyle.emphasis').getBarItemStyle();

    if (
        hoverStyle.hasOwnProperty('shadowColor') &&
        typeof hoverStyle.shadowColor === 'function'
    ) {
        hoverStyle.shadowColor = hoverStyle.shadowColor(seriesModel.getDataParams(dataIndex));
    }

    if (!isPolar) {
        el.setShape('r', itemStyleModel.get('barBorderRadius') || 0);
    }

    el.useStyle(zrUtil.defaults(
        {
            fill: color,
            stroke: borderColor,
            shadowColor: shadowColor,
            opacity: opacity
        },
        itemStyleModel.getBarItemStyle()
    ));

    var cursorStyle = itemModel.getShallow('cursor');
    cursorStyle && el.attr('cursor', cursorStyle);

    var labelPositionOutside = isHorizontal
        ? (layout.height > 0 ? 'bottom' : 'top')
        : (layout.width > 0 ? 'left' : 'right');

    if (!isPolar) {
        setLabel(
            el.style, hoverStyle, itemModel, color,
            seriesModel, dataIndex, labelPositionOutside
        );
    }

    graphic.setHoverStyle(el, hoverStyle);
}

// In case width or height are too small.
function getLineWidth(itemModel, rawLayout) {
    var lineWidth = itemModel.get(BAR_BORDER_WIDTH_QUERY) || 0;
    return Math.min(lineWidth, Math.abs(rawLayout.width), Math.abs(rawLayout.height));
}
