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import { TiltShiftXFilter } from './TiltShiftXFilter';
import { TiltShiftYFilter } from './TiltShiftYFilter';
import { Filter, FilterSystem, RenderTexture } from '@pixi/core';
import type { Point } from '@pixi/math';
import type { CLEAR_MODES } from '@pixi/constants';

// @author Vico @vicocotea
// original filter https://github.com/evanw/glfx.js/blob/master/src/filters/blur/tiltshift.js
// by Evan Wallace : http://madebyevan.com/

/**
 * A TiltShift Filter. Manages the pass of both a TiltShiftXFilter and TiltShiftYFilter.<br>
 * ![original](../tools/screenshots/dist/original.png)![filter](../tools/screenshots/dist/tilt-shift.png)
 *
 * @class
 * @extends PIXI.Filter
 * @memberof PIXI.filters
 * @see @pixi/filter-tilt-shift
 * @see pixi-filters
 */
class TiltShiftFilter extends Filter
{
    private tiltShiftXFilter: TiltShiftXFilter;
    private tiltShiftYFilter: TiltShiftYFilter;

    /**
     * @param {number} [blur=100] - The strength of the blur.
     * @param {number} [gradientBlur=600] - The strength of the gradient blur.
     * @param {PIXI.Point} [start=null] - The Y value to start the effect at.
     * @param {PIXI.Point} [end=null] - The Y value to end the effect at.
     */
    constructor(blur = 100, gradientBlur = 600, start?: Point, end?: Point)
    {
        super();
        this.tiltShiftXFilter = new TiltShiftXFilter(blur, gradientBlur, start, end);
        this.tiltShiftYFilter = new TiltShiftYFilter(blur, gradientBlur, start, end);
    }

    apply(filterManager: FilterSystem, input: RenderTexture, output: RenderTexture, clearMode: CLEAR_MODES): void
    {
        const renderTarget = filterManager.getFilterTexture();

        this.tiltShiftXFilter.apply(filterManager, input, renderTarget, 1);
        this.tiltShiftYFilter.apply(filterManager, renderTarget, output, clearMode);
        filterManager.returnFilterTexture(renderTarget);
    }

    /**
     * The strength of the blur.
     */
    get blur(): number
    {
        return this.tiltShiftXFilter.blur;
    }
    set blur(value: number)
    {
        this.tiltShiftXFilter.blur = this.tiltShiftYFilter.blur = value;
    }

    /**
     * The strength of the gradient blur.
     */
    get gradientBlur(): number
    {
        return this.tiltShiftXFilter.gradientBlur;
    }
    set gradientBlur(value: number)
    {
        this.tiltShiftXFilter.gradientBlur = this.tiltShiftYFilter.gradientBlur = value;
    }

    /**
     * The Y value to start the effect at.
     *
     * @member {PIXI.Point}
     */
    get start(): Point
    {
        return this.tiltShiftXFilter.start;
    }
    set start(value: Point)
    {
        this.tiltShiftXFilter.start = this.tiltShiftYFilter.start = value;
    }

    /**
     * The Y value to end the effect at.
     *
     * @member {PIXI.Point}
     */
    get end(): Point
    {
        return this.tiltShiftXFilter.end;
    }
    set end(value: Point)
    {
        this.tiltShiftXFilter.end = this.tiltShiftYFilter.end = value;
    }
}

export { TiltShiftFilter };