import { bindable, createTypedBindable, usePropertyTypeForBindable, usePropertyTypeForObservable, coerceFunctions } from "aurelia-typed-observable-plugin";
import { IBindableDecoratorFunction } from "aurelia-typed-observable-plugin/dist/types/bindable";

usePropertyTypeForBindable(true);
usePropertyTypeForObservable(true);

bindable.booleanMd = createTypedBindable("booleanMd");
coerceFunctions.booleanMd = val => {
	if (val === undefined) {
		return undefined;
	}
	else if (val === null) {
		return null;
	}
	else {
		return (val || val === "") && val !== "false" ? true : false;
	}
};

bindable.numberMd = createTypedBindable("numberMd");
coerceFunctions.numberMd = val => {
	if (val === undefined || val === "" || val === "undefined" || val === "NaN") {
		return undefined;
	}
	else if (val === null || val === "null") {
		return null;
	}
	else {
		return Number(val);
	}
};

bindable.stringMd = createTypedBindable("stringMd");
coerceFunctions.stringMd = val => {
	if (val === undefined) {
		return undefined;
	}
	else if (val === null) {
		return null;
	}
	else {
		return "" + val;
	}
};

declare module "aurelia-typed-observable-plugin/dist/types/bindable" {
	interface IBindableDecorator {
		booleanMd: IBindableDecoratorFunction<boolean>;
		numberMd: IBindableDecoratorFunction<number>;
		stringMd: IBindableDecoratorFunction<string>;
	}
}

// dummy export is needed to enforce loading order for requirejs
export class Dummy {
}