import TrackUnit, { TrackUnitEvent, TrackUnitStickingType, TrackUnitType } from "@/TrackUnit";
import "./TrackUnit.css";
import { h, IPublisher, ISubscriber, ISubscription, Publisher, Rung, RungOptions } from "@djledda/ladder";

export type TrackUnitUINodeOptions = RungOptions & {
    trackUnit: TrackUnit,
};

const EventTypeSubscriptions = [
    TrackUnitEvent.On,
    TrackUnitEvent.Off,
    TrackUnitEvent.TypeChange,
];
type EventTypeSubscriptions = typeof EventTypeSubscriptions[number];

export default class TrackUnitView extends Rung<HTMLElement> implements ISubscriber<EventTypeSubscriptions> {
    private trackUnit: TrackUnit;
    private subscription: ISubscription | null = null;
    private publisher: IPublisher<TrackUnitEvent> = new Publisher<TrackUnitEvent, TrackUnitView>(this);
    private rotationTimeout: ReturnType<typeof setTimeout> | null = null;
    private mouseDownListeners: ((ev: MouseEvent) => void)[] = [];
    private hoverListeners: ((ev: MouseEvent) => void)[] = [];
    private blockNextMouseUp = false;

    constructor(options: TrackUnitUINodeOptions) {
        super(options);
        this.trackUnit = options.trackUnit;
        this.setUnit(this.trackUnit);
    }

    setUnit(trackUnit: TrackUnit | null): void {
        if (trackUnit) {
            this.trackUnit = trackUnit;
            this.setupBindings();
            this.notify(this.publisher, trackUnit.isOn() ? TrackUnitEvent.On : TrackUnitEvent.Off);
            this.notify(this.publisher, TrackUnitEvent.TypeChange);
        } else {
            this.subscription?.unbind();
        }
    }

    private setupBindings() {
        this.subscription?.unbind();
        this.subscription = this.trackUnit.addSubscriber(this, EventTypeSubscriptions);
        this.hoverListeners.forEach(listener => this.render().removeEventListener("mouseover", listener));
        this.mouseDownListeners.forEach(listener => this.render().removeEventListener("mousedown", listener));
        this.redraw();
        this.hoverListeners.forEach(listener => this.render().addEventListener("mouseover", listener));
        this.mouseDownListeners.forEach(listener => this.render().addEventListener("mousedown", listener));
        this.render().addEventListener("mousedown", (ev) => this.handleMouseDown(ev));
        this.render().addEventListener("mouseout", (ev) => this.handleMouseOut(ev));
        this.render().addEventListener("mouseup", (ev) => this.handleMouseUp(ev));
        this.render().addEventListener("touchstart", (ev) => this.handleTouchStart(ev));
        this.render().addEventListener("touchend", (ev) => this.handleTouchEnd(ev));
    }

    private handleMouseDown(ev: MouseEvent): void {
        if (ev.button === 1) {
            this.trackUnit.rotateType();
        } else {
            this.rotationTimeout = this.rotationTimeout || setTimeout(() => {
                this.trackUnit.rotateType();
                this.blockNextMouseUp = true;
                this.rotationTimeout = null;
            }, 400);
        }
    }

    private handleMouseOut(ev: MouseEvent): void {
        if (this.rotationTimeout) {
            clearTimeout(this.rotationTimeout);
            this.rotationTimeout = null;
        }
    }

    private handleMouseUp(ev: MouseEvent): void {
        if (this.rotationTimeout) {
            clearTimeout(this.rotationTimeout);
            this.rotationTimeout = null;
        }
        if (!this.blockNextMouseUp) {
            this.mouseDownListeners.forEach(listener => listener(ev));
        }
        this.blockNextMouseUp = false;
    }

    private handleTouchStart(ev: TouchEvent): void {
        this.rotationTimeout = this.rotationTimeout || setTimeout(() => {
            this.trackUnit.rotateType();
            this.rotationTimeout = null;
        }, 400);
    }

    private handleTouchEnd(ev: TouchEvent): void {
        if (this.rotationTimeout) {
            clearTimeout(this.rotationTimeout);
            this.rotationTimeout = null;
        }
    }

    toggle(): void {
        this.trackUnit.toggle();
    }

    setStickingType(type: TrackUnitStickingType): void {
        this.trackUnit.setStickingType(type);
    }

    setType(type: TrackUnitType): void {
        this.trackUnit.setType(type);
    }

    turnOn(): void {
        this.trackUnit.setOn(true);
    }

    turnOff(): void {
        this.trackUnit.setOn(false);
    }

    notify(publisher: unknown, event: EventTypeSubscriptions): void {
        switch (event) {
        case TrackUnitEvent.On:
            this.render().classList.add("track-unit-on");
            break;
        case TrackUnitEvent.Off:
            this.render().classList.remove("track-unit-on");
            break;
        case TrackUnitEvent.TypeChange:
            this.syncTrackUnitType();
            this.syncStickingType(this.trackUnit.getStickingType());
        }
    }

    private syncStickingType(type: TrackUnitStickingType) {
        const node = this.render();
        node.classList.remove("track-unit-lh");
        node.classList.remove("track-unit-rh");
        node.classList.remove("track-unit-lf");
        node.classList.remove("track-unit-rf");
        if (type !== "none") {
            node.classList.add(`track-unit-${ type }`);
        }
    }

    private syncTrackUnitType() {
        switch (this.trackUnit.getType()) {
        case TrackUnitType.Normal:
            this.render().classList.remove("track-unit-ghost");
            this.render().classList.remove("track-unit-accent");
            break;
        case TrackUnitType.GhostNote:
            this.render().classList.add("track-unit-ghost");
            this.render().classList.remove("track-unit-accent");
            break;
        case TrackUnitType.Accent:
            this.render().classList.remove("track-unit-ghost");
            this.render().classList.add("track-unit-accent");
            break;
        case TrackUnitType.GhostNoteAccent:
            this.render().classList.add("track-unit-ghost");
            this.render().classList.add("track-unit-accent");
            break;
        }
    }

    build(): HTMLElement {
        const classes = ["track-unit"];
        if (this.trackUnit.isOn()) {
            classes.push("track-unit-on");
        }
        return <div classes={classes} oncontextmenu={() => false} /> as HTMLElement;
    }

    onHover(cb: () => void): void {
        this.hoverListeners.push(cb);
        this.render().addEventListener("mouseover", cb);
    }

    onMouseDown(cb: (ev: MouseEvent) => void): void {
        this.mouseDownListeners.push(cb);
        this.render().addEventListener("mousedown", cb);
    }
}