import { _decorator, CCFloat, CCInteger, Component, Node, Prefab, randomRangeInt } from 'cc';
import ObjectPool from '../Pool/ObjectPool';
import { ScoreObject } from '../Environments/ScoreObject';
import { EventManger } from './EventManger';
import GameEvent from '../Events/GameEvent';
import GameState from '../Enum/GameState';
import Utilities from '../Utilities';
import ScoreType from '../Enum/ScoreType';
const { ccclass, property } = _decorator;

@ccclass('weightedObject')
class weightedObject {
    @property(Prefab)
    public prefab: Prefab;
    @property(CCInteger)
    public readonly weight = 0;
    @property(CCInteger)
    public weightStepOnGoal = 0;
    @property(CCInteger)
    public maxWeight = 0;
    @property(CCInteger)
    public maxObjects = -1;
    @property({ type: CCInteger, readonly: true })
    public currentWeight;
}

@ccclass('SpawnObjectManager')
export class SpawnObjectManager extends Component {
    //#region singleton
    private static _instance: SpawnObjectManager = null;
    public static get instance(): SpawnObjectManager {
        return SpawnObjectManager._instance;
    }
    //#endregion

    @property({ type: weightedObject, visible: true })
    private _objects: weightedObject[] = [];
    @property({ type: Node, visible: true })
    private _spawnPoints: Node[] = [];
    @property({ type: CCFloat, visible: true, range: [1, 10], slide: true })
    private _spawnTime;

    private _pools: ObjectPool[] = [];
    private _usedPoints: { [key: string]: Node } = {};
    private _playing = false;
    private _timer = 0;
    private _weights: number[] = [];

    protected onLoad(): void {
        SpawnObjectManager._instance = this;
        EventManger.instance.on(GameEvent.ScoreObjectRelease, this.onObjectRelease, this);
        EventManger.instance.on(GameEvent.GameStateChange, this.onGameStateChange, this);
        EventManger.instance.on(GameEvent.Score, this.onScore, this);

        for (let i = 0; i < this._objects.length; i++) {
            const prefab = this._objects[i].prefab;
            this._pools[i] = new ObjectPool(prefab, 10, true, ScoreObject);
        }
    }

    protected update(dt: number): void {
        if (!this._playing) return;
        this._timer += dt;
        if (this._timer >= this._spawnTime) {
            this._timer = 0;
            this.spawn();
        }
    }

    private spawn() {
        if (Object.keys(this._usedPoints).length == this._spawnPoints.length) return;
        do {
            var [randomPool, index] = Utilities.weightedRandom(this._pools, this._weights);
        } while (this._objects[index].maxObjects != -1 && randomPool.countActive >= this._objects[index].maxObjects);
        do {
            var randomPoint = this._spawnPoints[randomRangeInt(0, this._spawnPoints.length)];
        } while (Object.values(this._usedPoints).indexOf(randomPoint) != -1);
        const obj = randomPool.get(this.node);
        obj.setWorldPosition(randomPoint.worldPosition);
        this._usedPoints[obj.uuid] = randomPoint;
    }

    private onObjectRelease(obj: Node) {
        delete this._usedPoints[obj.uuid];
    }

    private onScore(score: number, type: ScoreType) {
        if (type == ScoreType.Goal) {
            this._objects.forEach((object) => {
                if (object.currentWeight >= object.maxWeight) {
                    object.currentWeight = object.maxWeight;
                    return;
                }
                object.currentWeight += object.weightStepOnGoal;
            });

            this._weights = this._objects.map((obj) => obj.currentWeight);
        }
    }

    private onGameStateChange(state: GameState) {
        switch (state) {
            case GameState.Init:
                this._weights = this._objects.map((obj) => {
                    obj.currentWeight = obj.weight;
                    return obj.currentWeight;
                });
                for (let i = 0; i < randomRangeInt(5, 10); i++) {
                    this.spawn();
                }
                break;
            case GameState.Playing:
                this._playing = true;
                break;
            case GameState.GameOver:
                this._playing = false;
                break;
        }
    }
}