import {
    FrontCoverInterface,
    ProductViewInterface,
    SinglePageViewInterface,
} from './index';

import {
    LayoutBoxInterface,
} from '../index';

export default class ProductViewModel {
    public static isFrontCover(
        productView: ProductViewInterface,
    ) {
        const frontCover =
            productView as FrontCoverInterface;
        return Boolean(
            frontCover &&
            frontCover.title,
        );
    }

    public static isSinglePageView(
        productView: ProductViewInterface,
    ) {
        const singleView =
            productView as SinglePageViewInterface;
        return Boolean(
            singleView &&
            singleView.isSingleLeftPage !== undefined,
        );
    }

    public static isFirstPageView(
        productView: ProductViewInterface,
    ) {
        const singleView = productView as SinglePageViewInterface;
        return Boolean(
            ProductViewModel.isSinglePageView(productView) &&
            !singleView.isSingleLeftPage,
        );
    }

    public static isLastPageView(
        productView: ProductViewInterface,
    ) {
        const singleView = productView as SinglePageViewInterface;
        return Boolean(
            ProductViewModel.isSinglePageView(productView) &&
            singleView.isSingleLeftPage,
        );
    }

    public static getTotalNumberOfPages(
        allProductViews: ProductViewInterface[],
    ) {
        const normalPages = allProductViews.filter((productView) => (
            !ProductViewModel.isFrontCover(productView) &&
            !ProductViewModel.isSinglePageView(productView)
        )).length * 2;

        return normalPages +
            allProductViews.filter(
                ProductViewModel.isSinglePageView,
            ).length;
    }

    public static findWithId(
        productViews: ProductViewInterface[],
        id: number,
    ) {
        return productViews.find((productView) => (
            productView.id === id
        ));
    }

    public static findByContainedLayoutBox(
        productViews: ProductViewInterface[],
        layoutBox: LayoutBoxInterface,
    ) {
        return productViews.find((productView) => {
            return productView.layoutBoxes.some(
                (box) => (box.id === layoutBox.id),
            );
        });
    }
}