import {Vector4} from '../math';
import {ColorGenerator} from './ColorGenerator';
import {FunctionJSON} from './FunctionJSON';
import {ColorToJSON, JSONToColor} from '../util/JSONUtil';
import {GeneratorMemory} from './GeneratorMemory';

export class RandomColor implements ColorGenerator {
    constructor(
        public a: Vector4,
        public b: Vector4
    ) {
        this.type = 'value';
    }

    startGen(memory: GeneratorMemory): void {}

    genColor(memory: GeneratorMemory, color: Vector4): Vector4 {
        const rand = Math.random();
        return color.copy(this.a).lerp(this.b, rand);
    }

    type: 'value';

    toJSON(): FunctionJSON {
        return {
            type: 'RandomColor',
            a: ColorToJSON(this.a),
            b: ColorToJSON(this.b),
        };
    }

    static fromJSON(json: FunctionJSON): RandomColor {
        return new RandomColor(JSONToColor(json.a), JSONToColor(json.b));
    }

    clone(): ColorGenerator {
        return new RandomColor(this.a.clone(), this.b.clone());
    }
}