import { Property, Complex, ChildProperty} from '@syncfusion/ej2-base';import { measureText, Rect, TextOption, Size, PathOption, CanvasRenderer } from '@syncfusion/ej2-svg-base';import { Chart, ILegendRegions } from '../../chart';import { Font, Border, Margin, ContainerPadding } from '../model/base';import { Theme } from '../model/theme';import { MarginModel, FontModel, BorderModel, ContainerPaddingModel } from '../model/base-model';import { subtractThickness, Thickness, drawSymbol, ChartLocation, titlePositionX, getTitle, textTrim, getTextAnchor } from '../utils/helper';import { RectOption, textElement, stringToNumber } from '../utils/helper';import { removeElement, showTooltip, getElement, appendChildElement } from '../utils/helper';import { LegendPosition, LegendShape, ChartSeriesType, ChartShape, LegendMode } from '../../chart/utils/enum';import { Series } from '../../chart/series/chart-series';import { AccumulationType } from '../../accumulation-chart/model/enum';import { AccumulationChart } from '../../accumulation-chart/accumulation';import { BulletChart } from '../../bullet-chart/bullet-chart';import { Alignment, LegendTitlePosition, TextWrap, LabelOverflow} from '../utils/enum';import { StockChart } from '../../stock-chart';

/**
 * Interface for a class Location
 */
export interface LocationModel {

    /**
     * X coordinate of the legend in pixels.
     *
     * @default 0
     */

    x?: number;

    /**
     * Y coordinate of the legend in pixels.
     *
     * @default 0
     */

    y?: number;

}

/**
 * Interface for a class LegendSettings
 */
export interface LegendSettingsModel {

    /**
     * If set to true, legend will be visible.
     *
     * @default true
     */

    visible?: boolean;

    /**
     * The height of the legend in pixels.
     *
     * @default null
     */

    height?: string;

    /**
     * The width of the legend in pixels.
     *
     * @default null
     */

    width?: string;

    /**
     * Specifies the location of the legend, relative to the chart.
     * If x is 20, legend moves by 20 pixels to the right of the chart. It requires the `position` to be `Custom`.
     * ```html
     * <div id='Chart'></div>
     * ```
     * ```typescript
     * let chart: Chart = new Chart({
     * ...
     *   legendSettings: {
     *     visible: true,
     *     position: 'Custom',
     *     location: { x: 100, y: 150 },
     *   },
     * ...
     * });
     * chart.appendTo('#Chart');
     * ```
     */

    location?: LocationModel;

    /**
     * Position of the legend in the chart are,
     * * Auto: Places the legend based on area type.
     * * Top: Displays the legend at the top of the chart.
     * * Left: Displays the legend at the left of the chart.
     * * Bottom: Displays the legend at the bottom of the chart.
     * * Right: Displays the legend at the right of the chart.
     * * Custom: Displays the legend  based on the given x and y values.
     *
     * @default 'Auto'
     */

    position?: LegendPosition;

    /**
     * Mode of legend items.
     * * Series: Legend items generated based on series count.
     * * Point: Legend items generated based on unique data points.
     * * Range: Legend items generated based on range color mapping property.
     * * Gradient: Single linear bar generated based on range color mapping property.
     * This property is applicable for chart component only.
     */
    mode?: LegendMode;

    /**
     * Option to customize the padding around the legend items.
     *
     * @default 8
     */

    padding?: number;

    /**
     * Option to customize the padding between legend items.
     *
     * @default null
     */

    itemPadding?: number;

    /**
     * Legend in chart can be aligned as follows:
     * * Near: Aligns the legend to the left of the chart.
     * * Center: Aligns the legend to the center of the chart.
     * * Far: Aligns the legend to the right of the chart.
     *
     * @default 'Center'
     */

    alignment?: Alignment;

    /**
     * Options to customize the legend text.
     */

    textStyle?: FontModel;

    /**
     * Shape height of the legend in pixels.
     *
     * @default 10
     */

    shapeHeight?: number;

    /**
     * Shape width of the legend in pixels.
     *
     * @default 10
     */

    shapeWidth?: number;

    /**
     * Options to customize the border of the legend.
     */

    border?: BorderModel;

    /**
     *  Options to customize left, right, top and bottom margins of the chart.
     */

    margin?: MarginModel;

    /**
     *  Options to customize left, right, top and bottom padding for legend container of the chart.
     */

    containerPadding?: ContainerPaddingModel;

    /**
     * Padding between the legend shape and text.
     *
     * @default 8
     */

    shapePadding?: number;

    /**
     * The background color of the legend that accepts value in hex and rgba as a valid CSS color string.
     *
     * @default 'transparent'
     */

    background?: string;

    /**
     * Opacity of the legend.
     *
     * @default 1
     */

    opacity?: number;

    /**
     * If set to true, series' visibility collapses based on the legend visibility.
     *
     * @default true
     */

    toggleVisibility?: boolean;

    /**
     * If set to true, the series get highlighted, while hovering the legend.
     *
     * @default false
     */

    enableHighlight?: boolean;

    /**
     * Description for legends.
     *
     * @default null
     */

    description?: string;

    /**
     * TabIndex value for the legend.
     *
     * @default 3
     */

    tabIndex?: number;

    /**
     * Title for legends.
     *
     * @default null
     */

    title?: string;

    /**
     * Options to customize the legend title.
     */
    
    titleStyle?: FontModel;

    /**
     * legend title position.
     *
     * @default 'Top'
     */

    titlePosition?: LegendTitlePosition;

    /**
     * Defines the text wrap behavior to employ when the individual legend text overflows
     * * `Normal` -  Specifies to break words only at allowed break points.
     * * `Wrap` - Specifies to break a word once it is too long to fit on a line by itself.
     * * `AnyWhere` - Specifies to break a word at any point if there are no otherwise-acceptable break points in the line.
     *
     * @default 'Normal'
     */

    textWrap?: TextWrap;

    /**
     * Defines the text overflow behavior to employ when the individual legend text overflows
     * * `Clip` -  Specifies the text is clipped and not accessible.
     * * `Ellipsis` -  Specifies an ellipsis (“...”) to the clipped text.
     *
     * @default 'Ellipsis'
     */

    textOverflow?: LabelOverflow;

    /**
     * maximum width for the legend title.
     *
     * @default 100
     */

    maximumTitleWidth?: number;

    /**
     * Maximum label width for the legend text.
     *
     * @default null
     */

    maximumLabelWidth?: number;

    /**
     * If set to true, legend will be visible using pages.
     *
     * @default true
     */

    enablePages?: boolean;

    /**
     * If `isInversed` set to true, then it inverses legend item content (image and text).
     * @default false.
     */

    isInversed?: boolean;

    /**
     * If `reverse` set to true, then it reverse the legend items order.
     *
     * @default false
     */

    reverse?: boolean;

}

/**
 * Interface for a class BaseLegend
 * @private
 */
export interface BaseLegendModel {

}

/**
 * Interface for a class LegendOptions
 * @private
 */
export interface LegendOptionsModel {

}