import { ITaxonomyNavigationService } from './ITaxonomyNavigationService';
import { IMenuItem } from './IMenuItem';
import { sp } from '@pnp/sp';
import { MenuItem } from './MenuItem';
import { ApplicationCustomizerContext } from '@microsoft/sp-application-base';
import SPTermStorePickerService from './SPTermStorePickerService';
import { ITerm, ITermSet } from './ISPTermStorePickerService';
import { ItemDictionary } from './ItemDictionary';
import { debugWarn } from './MegaMenuDebug';

const LOG_SOURCE: string = 'TaxonomyNavigationService';

export class TaxonomyNavigationService implements ITaxonomyNavigationService {
    private _taxonomyPickerService: SPTermStorePickerService;
    constructor(
        private context: ApplicationCustomizerContext,
        private termSetNameOrId: string,
        private debug: boolean = false,
        private cacheMinutes: number = 15
    ) {
        sp.setup({
            spfxContext: context
        });
        this._taxonomyPickerService = new SPTermStorePickerService(
            {
                anchorId: '',
                termsetNameOrID: termSetNameOrId,
                useSessionStorage: true,
                hideDeprecatedTags: true,
                hideTagsNotAvailableForTagging: false,
                cacheMinutes: cacheMinutes
            },
            this.context,
            this.debug
        );
    }

    public async getMenuItems(): Promise<IMenuItem[]> {
        const siteCollectionUrl: string = this.context.pageContext.site.absoluteUrl;
        const termset: ITermSet = await this._taxonomyPickerService.getAllTerms(
            this.termSetNameOrId,
            true,
            false,
            true,
            this.cacheMinutes
        );
        const itemsDict: ItemDictionary<IMenuItem> = new ItemDictionary<IMenuItem>();
        const menuItems: IMenuItem[] = [];

        if (!termset || !termset.Terms || termset.Terms.length === 0) {
            debugWarn(this.debug, LOG_SOURCE, 'No terms found in the term set.');
            throw new Error('The configured navigation term set was not found or contains no terms.');
        }

        termset.Terms.forEach((term: ITerm) => {
            const menuItem: IMenuItem = new MenuItem(term, 0, siteCollectionUrl);
            itemsDict.Add(term.Id, menuItem);
            if (menuItem.pathDepth === 1) {
                menuItems.push(menuItem);
            } else {
                const parentItem: IMenuItem = itemsDict.Get(term.ParentId);
                if (parentItem) {
                    parentItem.items.push(menuItem);
                } else {
                    debugWarn(this.debug, LOG_SOURCE, 'Item without parent:', term.PathOfTerm);
                }
            }
        });

        return menuItems;
    }
}