import { _decorator, Component, Sprite, Tween, tween, UIOpacity, UITransform, v3, Vec3 } from 'cc';
import { Card } from '../../core/cards/Card';
import { Layout, Timing } from '../common/Theme';
import { CardLibrary } from './CardLibrary';

const { ccclass, property } = _decorator;

/**
 * One card on screen.
 *
 * A card node belongs to a `Card` for as long as that card is visible, and
 * follows it from hand to table to discard. Movement is therefore just a tween
 * to a new position, and the natural-looking animation falls out of the layout
 * rather than having to be choreographed per event.
 */
@ccclass('CardView')
export class CardView extends Component {
    @property(Sprite)
    sprite: Sprite | null = null;

    private _library: CardLibrary | null = null;
    private _card: Card | null = null;
    private _faceUp = false;

    get card(): Card | null {
        return this._card;
    }

    get faceUp(): boolean {
        return this._faceUp;
    }

    /** Called once, when the view is taken from the pool. */
    bind(library: CardLibrary, card: Card | null, faceUp: boolean): void {
        this._library = library;
        this._card = card;
        this._faceUp = faceUp;
        this._applyFrame();

        const transform = this.getComponent(UITransform);
        transform?.setContentSize(Layout.cardWidth, Layout.cardHeight);
    }

    /** Flips the card, turning it edge-on halfway through so the swap is hidden. */
    flipTo(faceUp: boolean, animated = true): void {
        if (this._faceUp === faceUp) {
            return;
        }
        this._faceUp = faceUp;

        if (!animated) {
            this._applyFrame();
            return;
        }

        const scale = this.node.scale.clone();
        tween(this.node)
            .to(Timing.flip / 2, { scale: v3(0.02, scale.y, scale.z) })
            .call(() => this._applyFrame())
            .to(Timing.flip / 2, { scale })
            .start();
    }

    /** Moves, rotates and scales the card into place. */
    moveTo(position: Vec3, scale: number, angle: number, duration: number, delay = 0): void {
        const target = { position, scale: v3(scale, scale, 1), angle };
        if (duration <= 0) {
            this.node.setPosition(position);
            this.node.setScale(target.scale);
            this.node.angle = angle;
            return;
        }
        tween(this.node)
            .delay(delay)
            .to(duration, target, { easing: 'quadOut' })
            .start();
    }

    /** Fades out, then hands the node back through `done`. */
    fadeOut(duration: number, done: () => void): void {
        const opacity = this.node.getComponent(UIOpacity) ?? this.node.addComponent(UIOpacity);
        tween(opacity)
            .to(duration, { opacity: 0 })
            .call(() => {
                opacity.opacity = 255;
                done();
            })
            .start();
    }

    /** Stops any running tween. Used when a match is torn down mid-animation. */
    cancelAnimations(): void {
        Tween.stopAllByTarget(this.node);
        const opacity = this.node.getComponent(UIOpacity);
        if (opacity) {
            Tween.stopAllByTarget(opacity);
            opacity.opacity = 255;
        }
    }

    private _applyFrame(): void {
        if (!this.sprite || !this._library) {
            return;
        }
        this.sprite.spriteFrame = this._faceUp && this._card
            ? this._library.frameFor(this._card)
            : this._library.backFrame;
    }
}