import { GenerativeFillMathHelpers } from './GenerativeFillMathHelpers';
import { eraserColor } from './generativeFillConstants';
import { Point } from './generativeFillInterfaces';

export class BrushHandler {
    static brushCircleOverlay = (x: number, y: number, brushRadius: number, ctx: CanvasRenderingContext2D, fillColor: string /* , erase: boolean */) => {
        ctx.globalCompositeOperation = 'destination-out';
        ctx.fillStyle = fillColor;
        ctx.shadowColor = eraserColor;
        ctx.shadowBlur = 5;
        ctx.beginPath();
        ctx.arc(x, y, brushRadius, 0, 2 * Math.PI);
        ctx.fill();
        ctx.closePath();
    };

    static createBrushPathOverlay = (startPoint: Point, endPoint: Point, brushRadius: number, ctx: CanvasRenderingContext2D, fillColor: string /* , erase: boolean */) => {
        const dist = GenerativeFillMathHelpers.distanceBetween(startPoint, endPoint);

        for (let i = 0; i < dist; i += 5) {
            const s = i / dist;
            BrushHandler.brushCircleOverlay(startPoint.x * (1 - s) + endPoint.x * s, startPoint.y * (1 - s) + endPoint.y * s, brushRadius, ctx, fillColor /* , erase */);
        }
    };
}