import { CoroutineV2 } from "../../CatanEngine/CoroutineV2/CoroutineV2";
import { RandomEx } from "../../Utils/Number/RandomEx";

const { ccclass, property, requireComponent, menu } = cc._decorator;

@ccclass("State")
export class State {
    @property()
    public name: string = "";
    @property({ type: cc.AnimationClip })
    public clip: cc.AnimationClip = null;
    @property()
    public transitionTo: string = "";
}
@ccclass
@menu("Plug-in/Animation/Animator")
@requireComponent(cc.Animation)
export class Animator extends cc.Component {

    @property({ displayName: "Default State" })
    public defaultState: string = "";

    @property({ type: State })
    public states: State[] = [];
    public nowPlayName: string = "";
    _animation: cc.Animation = null;

    /** 動畫速度 */
    private _speed: number = 1;
    get animation(): cc.Animation {
        if (this._animation == null) {
            this._animation = this.node.getComponent(cc.Animation);
        }
        return this._animation;
    }

    onLoad(): void {
        if (CC_DEV) {
            let animationClip: cc.AnimationClip[] = this.animation.getClips();
            for (let s of this.states) {
                let state: State = null;
                for (let i: number = 0; i < animationClip.length; i++) {
                    const clip: cc.AnimationClip = animationClip[i];
                    if (s.clip != null && s.clip.name === clip.name) {
                        state = s;
                        break;
                    }
                }
                if (state === null) {
                    console.error(`node: ${this.node.name}, anim: ${s.clip?.name}, 動畫沒有掛在Animation上面`);
                }
            }
        }
    }

    onEnable(): void {
        this.stopState();
        if (this.defaultState !== "") {
            this.playState(this.defaultState);
        }
    }
    onDisable(): void {
        this.stopState();
    }

    /**
     * runStateAndWait(動作機只會接一次動畫)
     * @param name 動畫State的名稱
     * @param callback callback 沒有transitionTo才會觸發
     */
    public *runStateAndWait(name: string, callback: Function = null): any {
        if (name === "") {
            return;
        }
        this.animation.stop();
        this.nowPlayName = name;
        let state: State = null;
        for (let s of this.states) {
            if (s.name === name && s.clip != null && s.clip.isValid) {
                state = s;
                break;
            }
        }
        if (state == null) {
            return;
        }
        let animationState: cc.AnimationState = this.animation.play(state.clip.name);
        animationState.speed = this.animation.currentClip.speed * this._speed;
        this.animation.sample(animationState.name);
        if (animationState.duration) {
            yield CoroutineV2.WaitTime(animationState.duration);
        }
        if (callback && !state.transitionTo) {
            callback();
        }
        yield* this.runStateAndWait(state.transitionTo, callback);
    }

    /** playState(動作機只會接一次動畫) */
    public playState(name: string, callback: Function = null): void {
        if (!this.node?.activeInHierarchy) {
            cc.warn(`Animator error name: ${this.node.name}, activeInHierarchy: ${this.node.activeInHierarchy}`);
        }
        CoroutineV2.Single(this.runStateAndWait(name, callback)).Start(this);
    }

    /** playState(隨機) */
    public playRandomState(callback: Function = null): void {
        let random: number = RandomEx.GetInt(0, this.states.length);
        let state: State = this.states[random];
        this.playState(state.name, callback);
    }

    public stopState(): void {
        CoroutineV2.StopCoroutinesBy(this);
        this.nowPlayName = "";
    }

    /**
     * 設定動畫速率(原有動畫的Speed在乘上倍率)
     * @param speed 速率
     */
    public SetSpeed(speed: number): void {
        this._speed = speed;
    }

    public getAnimTime(name: string, isGetNext: boolean = false): number {
        for (let s of this.states) {
            if (s.name === name && s.clip != null) {
                let time: number = s.clip.duration / this._speed;
                if (isGetNext && s.transitionTo !== "") {
                    time += this.getAnimTime(s.transitionTo, true);
                }
                return time;
            }
        }
        return null;
    }

    /**
     * 暫停在某時間
     * @param name Animator設定的動畫名稱
     * @param time 要停的時間點
     * @example
     * this._anim.GotoTimeAndPause(name, 0);
     */
    public GotoTimeAndPause(name: string, time: number = 0): void {
        let clipName: string = null;
        for (let s of this.states) {
            if (s.name === name && s.clip != null) {
                clipName = s.clip.name;
            }
        }
        if (!clipName) {
            cc.error(`GotoFrameAndPause get clip error: ${name}`);
            return;
        }
        this.animation.play(clipName);
        this.animation.stop(clipName);
        this.animation.setCurrentTime(time);
        this.animation.sample(clipName);
    }
}