// (C) 2007-2018 GoodData Corporation
import get = require("lodash/get");

export interface IIdentifierWithTags {
    identifier: string;
    tags: string;
}

export interface IDisplayForms {
    [key: string]: IIdentifierWithTags;
}

export interface IAttrItem {
    identifier: string;
    tags: string;
    displayForms: IDisplayForms;
    defaultDisplayForm: IIdentifierWithTags;
}

export interface IAttrs {
    [key: string]: IAttrItem;
}

export interface IDataSet {
    identifier: string;
    tags: string;
    attributes: IAttrs;
}

export interface ICatalog {
    measures?: { [key: string]: IIdentifierWithTags };
    visualizations: { [key: string]: IIdentifierWithTags };
    attributes: IAttrs;
    dateDataSets: { [key: string]: IDataSet };
}

function getDisplayFormFromAttr(
    attrs: IAttrs,
    attributeName: string,
    displayFormName: string,
    property: string,
): string {
    if (!displayFormName) {
        return get(attrs, [attributeName, "defaultDisplayForm", property]);
    }
    return get(attrs, [attributeName, "displayForms", displayFormName, property]);
}

/**
 * CatalogHelper
 * is a tool that exposes API that to look up measures, attributes, visualizations and other metadata elements
 * example usage:
 *  import catalog from './catalog.json';
 *  const C = new CatalogHelper(catalog);
 */
export default class CatalogHelper {
    public measures: { [key: string]: IIdentifierWithTags };
    public visualizations: { [key: string]: IIdentifierWithTags };
    public attributes: { [key: string]: IAttrItem };
    public dateDataSets: { [key: string]: IDataSet };

    constructor(catalog: ICatalog) {
        this.measures = catalog.measures;
        this.visualizations = catalog.visualizations;
        this.attributes = catalog.attributes;
        this.dateDataSets = catalog.dateDataSets;
    }

    public measure(name: string): string {
        return get(this, ["measures", name, "identifier"]);
    }

    public measureTags(name: string): string {
        return get(this, ["measures", name, "tags"]);
    }

    public visualization(name: string): string {
        return get(this, ["visualizations", name, "identifier"]);
    }

    public visualizationTags(name: string): string {
        return get(this, ["visualizations", name, "tags"]);
    }

    public attribute(attributeName: string): string {
        return get(this, ["attributes", attributeName, "identifier"]);
    }

    public attributeTags(attributeName: string): string {
        return get(this, ["attributes", attributeName, "tags"]);
    }

    public attributeDisplayForm(attributeName: string, displayFormName?: string): string {
        return getDisplayFormFromAttr(this.attributes, attributeName, displayFormName, "identifier");
    }

    public attributeDisplayFormTags(attributeName: string, displayFormName?: string): string {
        return getDisplayFormFromAttr(this.attributes, attributeName, displayFormName, "tags");
    }

    public dateDataSet(dataSetName: string): string {
        return get(this, ["dateDataSets", dataSetName, "identifier"]);
    }

    public dateDataSetTags(dataSetName: string): string {
        return get(this, ["dateDataSets", dataSetName, "tags"]);
    }

    public dateDataSetAttribute(dataSetName: string, attrName: string): string {
        return get(this, ["dateDataSets", dataSetName, "attributes", attrName, "identifier"]);
    }

    public dateDataSetAttributeTags(dataSetName: string, attrName: string): string {
        return get(this, ["dateDataSets", dataSetName, "attributes", attrName, "tags"]);
    }

    public dateDataSetDisplayForm(
        dataSetName: string,
        attributeName: string,
        displayFormName?: string,
    ): string {
        const attrs = get(this, ["dateDataSets", dataSetName, "attributes"]);
        return getDisplayFormFromAttr(attrs, attributeName, displayFormName, "identifier");
    }

    public dateDataSetDisplayFormTags(
        dataSetName: string,
        attributeName: string,
        displayFormName?: string,
    ): string {
        const attrs = get(this, ["dateDataSets", dataSetName, "attributes"]);
        return getDisplayFormFromAttr(attrs, attributeName, displayFormName, "tags");
    }
}