import RainbowTrail from "./RainbowTrail";
import RainbowBottleWater from "./RainbowBottleWater";
import { RAINBOW_CAST_SECONDS } from "./RainbowRules";

/** C 方案开局自动施放一次；地图在尾迹消散后才开放操作。 */
export default class RainbowOldOpening {
    private flight: RainbowTrail;
    private from: cc.Vec2;
    private to: cc.Vec2;
    private elapsed = 0;
    private landed = false;
    private disposed = false;
    private hidden = false;
    private hide = () => {
        this.hidden = true;
        if (this.flight) this.flight.update(true);
        if (cc.isValid(this.bottle, true)) this.bottle.active = false;
    };
    private show = () => {
        this.hidden = false;
        if (!this.disposed && cc.isValid(this.bottle, true)) this.bottle.active = true;
    };

    constructor(parent: cc.Node, private bottle: cc.Node, to: cc.Vec2, private onLand: () => void) {
        this.from = parent.convertToNodeSpaceAR(bottle.convertToWorldSpaceAR(cc.v2(0, 0)));
        this.to = cc.v2(to.x, to.y);
        bottle.active = true;
        bottle.color = cc.Color.WHITE;
        bottle.getComponent(cc.Sprite).fillRange = 1;
        if (!bottle.getComponent(RainbowBottleWater)) bottle.addComponent(RainbowBottleWater);
        this.flight = new RainbowTrail(parent, RAINBOW_CAST_SECONDS);
        this.flight.node.setPosition(this.from);
        // 转场结束前由地图保持暂停，不能让粒子在遮罩后先发射。
        this.flight.update(true);
        cc.game.on(cc.game.EVENT_HIDE, this.hide);
        cc.game.on(cc.game.EVENT_SHOW, this.show);
    }

    /** 返回 true 表示飞行和尾迹均已结束；开局不依赖游戏倒计时。 */
    update(dt: number, paused = false): boolean {
        if (this.disposed) return true;
        if (!this.flight.update(this.hidden || paused)) {
            // RainbowTrail 已自行释放资源，不能在 dispose 中再销毁一次。
            this.flight = null;
            this.dispose();
            return true;
        }
        if (this.hidden || paused || this.landed) return false;
        this.elapsed += dt;
        const t = Math.min(1, this.elapsed / RAINBOW_CAST_SECONDS);
        // 与 B 同一条弧线：先抛到目标上方，再竖直落入目标。
        const top = Math.max(this.from.y, this.to.y) + 180;
        const controlY = top + Math.sqrt((top - this.from.y) * (top - this.to.y));
        const u = 1 - t;
        this.flight.node.setPosition(this.to.x + (this.from.x - this.to.x) * u * u,
            u * u * this.from.y + 2 * u * t * controlY + t * t * this.to.y);
        this.flight.setProgress(t);
        if (t >= 1) {
            this.landed = true;
            this.flight.stop();
            this.onLand();
        }
        return this.disposed;
    }

    dispose(): void {
        if (this.disposed) return;
        this.disposed = true;
        if (this.flight) {
            this.flight.destroy();
            this.flight = null;
        }
        cc.game.off(cc.game.EVENT_HIDE, this.hide);
        cc.game.off(cc.game.EVENT_SHOW, this.show);
        if (cc.isValid(this.bottle, true)) this.bottle.active = false;
    }
}