enum Layer {
    mod,
    fn,
    mouse
}

class SwitchLayerAction extends KeyAction implements Serializable<SwitchLayerAction> {

    static keyActionTypeString = 'switchLayer';
    static toggleFlag = 0x80;

    isLayerToggleable: boolean;

    private _layer: Layer;

    get layer(): number {
        return this._layer;
    }

    set layer(value) {
        if (!TypeChecker.isUInt8Valid(value)) {
            throw 'Invalid SwitchLayerAction.layerId: ${value}';
        }
        this._layer = value;
    }

    getToggleFlag() {
        return this.isLayerToggleable ? SwitchLayerAction.toggleFlag : 0;
    }

    fromJsObject(jsObject: any): SwitchLayerAction {
        this.assertKeyActionType(jsObject, SwitchLayerAction.keyActionTypeString, 'SwitchLayerAction');
        this.layer = jsObject.keymapId;
        this.isLayerToggleable = jsObject.toggle;
        return this;
    }

    fromBinary(buffer: UhkBuffer): SwitchLayerAction {
        this.readAndAssertKeyActionId(buffer, KeyActionId.SwitchLayerAction, 'SwitchLayerAction');
        this.layer = buffer.readUInt8();
        this.isLayerToggleable = (this.layer & SwitchLayerAction.toggleFlag) !== 0;
        this.layer &= ~SwitchLayerAction.toggleFlag; // Clear toggle bit.
        return this;
    }

    toJsObject(): any {
        return {
            keyActionType: SwitchLayerAction.keyActionTypeString,
            layer: this.layer,
            toggle: this.isLayerToggleable
        };
    }

    toBinary(buffer: UhkBuffer) {
        buffer.writeUInt8(KeyActionId.SwitchLayerAction);
        buffer.writeUInt8(this.layer | this.getToggleFlag());
    }
}