import { Property, Complex, ChildProperty, extend, getValue, createElement} 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, Location, ContainerPadding, Accessibility } from '../model/base';import { MarginModel, FontModel, BorderModel, LocationModel, ContainerPaddingModel, AccessibilityModel } from '../model/base-model';import { subtractThickness, Thickness, drawSymbol, ChartLocation, titlePositionX, getTitle, textTrim, getTextAnchor } from '../utils/helper';import { RectOption, textElement, stringToNumber, createTemplate } from '../utils/helper';import { removeElement, showTooltip, getElement, appendChildElement } from '../utils/helper';import { 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, LegendShape, LegendPosition, LegendLayout} from '../utils/enum';import {  StockChart } from '../../stock-chart';import { Chart3D } from '../../chart3d';import { CircularChart3D } from '../../circularchart3d';import { AccumulationSeries } from '../../accumulation-chart';import { Sankey } from '../../sankey';

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

    /**
     * If set to true, the legend will be displayed for the chart.
     *
     * @default true
     */

    visible?: boolean;

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

    height?: string;

    /**
     * Specifies 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, the legend moves 20 pixels to the right of the chart.
     > Note that the `position` must be set to `Custom` for this feature to work.
     * ```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;

    /**
     * Sets the position of the legend in the chart.
     * Available options include:
     * * Auto - Places the legend according to the area type.
     * * Top - Displays the legend at the top of the chart.
     * * Left - Displays the legend on the left side of the chart.
     * * Bottom - Displays the legend at the bottom of the chart.
     * * Right - Displays the legend to the right of the chart.
     * * Custom - Displays the legend according to the given x and y position values.
     *
     * @default 'Auto'
     */

    position?: LegendPosition;

    /**
     * Defines the mode for displaying legend items.
     * * Series - Legend items are generated based on the count of series.
     * * Point - Legend items are created according to each unique data point.
     * * Range - Legend items are generated based on the range color mapping property.
     * * Gradient - Displays a single linear bar that represents the range color mapping property.
     > Note that this property is applicable only for the chart component.
     */
    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;

    /**
     * Defines the alignment of the legend in the chart.
     * The options are:
     * * 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;

    /**
     * The `textStyle` property provides options to customize the appearance of the text in the legend, including the font family, size, style, weight, and color.
     */

    textStyle?: FontModel;

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

    shapeHeight?: number;

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

    shapeWidth?: number;

    /**
     * Options for customizing the border of the legend.
     */

    border?: BorderModel;

    /**
     * Options for customizing the left, right, top, and bottom margins of the chart.
     */

    margin?: MarginModel;

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

    containerPadding?: ContainerPaddingModel;

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

    shapePadding?: number;

    /**
     * The background color of the legend, which accepts values in hex and rgba as valid CSS color strings.
     *
     * @default 'transparent'
     */

    background?: string;

    /**
     * Customizes the opacity of the legend.
     *
     * @default 1
     */

    opacity?: number;

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

    toggleVisibility?: boolean;

    /**
     * If set to true, the series will be highlighted when hovering over the legend.
     *
     * @default false
     */

    enableHighlight?: boolean;

    /**
     * A description of the legend that provides additional information for screen readers.
     *
     * @default null

     */

    description?: string;

    /**
     * The `tabIndex` property determines the order in which the legend receives focus when navigating through elements with the keyboard.
     *
     * @default 3

     */

    tabIndex?: number;

    /**
     * Specifies the title of the legend.
     *
     * @default null
     */

    title?: string;

    /**
     * The `titleStyle` property configures the font settings for the legend title, including font family, size, style, weight, and color.
     */

    titleStyle?: FontModel;

    /**
     * The `titlePosition` property specifies the position of the legend title.
     * Available options are:
     * * Top - Aligns the title to the top of the legend.
     * * Left - Aligns the title to the left of the legend.
     * * Right - Aligns the title to the right of the legend.
     *
     * @default 'Top'
     */

    titlePosition?: LegendTitlePosition;

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

    textWrap?: TextWrap;

    /**
     * Defines the behavior for handling the overflow of legend text.
     * * `Clip` - Specifies that the text is clipped and not accessible.
     * * `Ellipsis` - Specifies an ellipsis (“...”) for the clipped text.
     *
     * @default 'Ellipsis'
     */

    textOverflow?: LabelOverflow;

    /**
     * Specifies the maximum width of the legend title.
     *
     * @default 100
     */

    maximumTitleWidth?: number;

    /**
     * Specifies the maximum width of the legend text labels.
     *
     * @default null
     */

    maximumLabelWidth?: number;

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

    enablePages?: boolean;

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

    isInversed?: boolean;

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

    reverse?: boolean;

    /**
     * Specifies the layout of the legend items in the chart.
     * Available options are:
     * * `Vertical`: Legend items are arranged in a single column. If the legend items exceed the available space, paging is automatically applied to allow the user to navigate through the legend.
     * * `Horizontal`: Legend items are arranged in a single row. If the legend items exceed the available space, paging is automatically applied to allow the user to navigate through the legend.
     * * `Auto` (default): Legend items are placed based on the available space.
     *
     * @default 'Auto'
     */

    layout?: LegendLayout;

    /**
     * Specifies the maximum number of columns to allow in the available space when the layout is set to 'Auto'.
     *
     * @default null
     */

    maximumColumns?: number;

    /**
     * When set to true, all legend items are rendered with an equal width, which is the maximum width of all items.
     *
     * @default false
     */
    fixedWidth?: boolean;

    /**
     * Options to improve accessibility for legend elements.
     */
    accessibility?: AccessibilityModel;

    /**
     * Specifies the custom template used to display the legend content.
     * The template can contain any valid HTML element or layout. When set, the provided template replaces the default legend text for the series.
     *
     * @default null.
     */

    template?: string | Function;

    /**
     * Enables synchronized legend behavior across multiple series in AccumulationChart.
     * When set, points with matching `mappingKey` values are grouped into a single legend item.
     * This is useful for multi-series pie/donut charts to create category-based legends.
     *
     * Example: If `mappingKey` is set to 'category', all points with the same category value
     * across different series will be represented by a single legend item.
     *
     * @default null
     */

    mappingKey?: string;

}

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

}

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

}