import { Vec2, Vec3 } from 'cc';

export default class Utilities {
    /**
     *
     * @param time (s)
     * @returns
     */
    public static delay(time: number): Promise<any> {
        return new Promise((resolve) => setTimeout(resolve, time * 1000));
    }

    /**
     *@param predicate
     * @param time (s)
     * @returns
     */
    public static async waitUntil(predicate: () => boolean, timeCheck = 0.01) {
        while (!predicate()) {
            await this.delay(timeCheck);
        }
    }

    public static getJson(json: string): any {
        try {
            return JSON.parse(json);
        } catch (error) {
            return false;
        }
    }

    public static Vec2ToVec3(Vec2: Vec2): Vec3 {
        return new Vec3(Vec2.x, Vec2.y);
    }

    public static Vec3ToVec2(Vec3: Vec3): Vec2 {
        return new Vec2(Vec3.x, Vec3.y);
    }

    public static weightedRandom<T>(items: T[], weights: number[]): T {
        const weightsClone = [...weights];
        const totalWeight = weightsClone.reduce((a, b) => a + b, 0);
        let random = Math.random() * totalWeight;
        const item = items.find((_, i) => (random -= weightsClone[i]) <= 0);
        return item;
        // for (i = 1; i < weightsClone.length; i++) {
        //     weightsClone[i] += weights[i - 1];
        // }

        // let random = Math.random() * weightsClone[weightsClone.length - 1];

        // for (i = 0; i < weightsClone.length; i++) {
        //     if (weightsClone[i] > random) break;
        // }
        // return [items[i], i];
    }
}