import { isEqual } from 'lodash'
import { defaults } from '../types/util';

export interface LabelStyle {
    font?: string,
    color?: string
}

/**
 * Lazily apply style attributes to another label style
 * @param source
 * @param target
 */
function applyLabelStyleAttributes (target: LabelStyle, source: LabelStyle): void {

    defaults(target, source, ['font', 'color']);

}

/**
 * Create a clone of a label style
 * @param style
 */
function cloneLabelStyle (style: LabelStyle): LabelStyle {
    const clone = {};
    applyLabelStyleAttributes(clone, style);
    return clone;
}

/**
 * Returns true if the styles are equivalent, false otherwise
 * @param a
 * @param b
 */
function equivalentLabelStyles (a: LabelStyle, b: LabelStyle): boolean {

    return isEqual(a, b);

}

export {
    applyLabelStyleAttributes,
    cloneLabelStyle,
    equivalentLabelStyles
}