dynamicbible/app/db/src/app/services/app.service.ts

import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';
import {
  AppState,
  SavedPage,
  HashTable,
  Paragraph,
  BiblePassage,
  BibleVerse,
  Error,
  BibleParagraph,
  BibleParagraphPassage,
  CardItem,
  DictionaryType,
  StrongsDefinition,
  StrongsCrossReference,
  RMACCrossReference,
  RMACDefinition,
  WordLookupResult,
  WordToStem,
  IndexResult,
} from '../models/app-state';
import { Section, BibleReference } from '../common/bible-reference';
import { PageTitles } from '../constants';
import { createStateService } from '../common/state-service';
import * as math from 'mathjs';

const initialState: AppState = {
  cards: [],
  autocomplete: [],
  savedPages: [],
  mainPages: [
    { title: PageTitles.Search, icon: 'search' },
    { title: PageTitles.Settings, icon: 'settings' },
    { title: PageTitles.Help, icon: 'help' },
  ],
  error: null,
  paragraphs: null,
  displaySettings: {
    showStrongsAsModal: false,
    appendCardToBottom: true,
    insertCardNextToItem: true,
    fontSize: 12,
    fontFamily: 'PT Serif',
    showVersesOnNewLine: false,
    showVerseNumbers: false,
    showParagraphs: true,
    showParagraphHeadings: true,
  },
};

type AppAction =
  | {
      type: 'UPDATE_PAGES';
      pages: SavedPage[];
    }
  | {
      type: 'ADD_CARD';
      card: CardItem;
      nextToItem: CardItem;
    }
  | {
      type: 'UPDATE_CARD';
      newCard: CardItem;
      oldCard: CardItem;
    }
  | {
      type: 'REMOVE_CARD';
      card: CardItem;
    }
  | {
      type: 'UPDATE_ERROR';
      error: Error;
    }
  | {
      type: 'UPDATE_PARAGRAPHS';
      paragraphs: HashTable<Paragraph>;
    }
  | {
      type: 'UPDATE_FONT_SIZE';
      size: number;
    }
  | {
      type: 'UPDATE_FONT_FAMILY';
      family: string;
    }
  | {
      type: 'UPDATE_AUTOCOMPLETE';
      words: string[];
    };

function reducer(state: AppState, action: AppAction): AppState {
  // somtimes the state is null. lets not complain if that happens.
  if (state === undefined) {
    state = initialState;
  }

  switch (action.type) {
    case 'UPDATE_AUTOCOMPLETE': {
      return {
        ...state,
        autocomplete: [...action.words],
      };
    }
    case 'UPDATE_PAGES': {
      return {
        ...state,
        savedPages: [...action.pages],
      };
    }
    case 'ADD_CARD': {
      let cards = [];

      if (action.nextToItem && state.displaySettings.insertCardNextToItem) {
        const idx = state.cards.indexOf(action.nextToItem);

        if (state.displaySettings.appendCardToBottom) {
          const before = state.cards.slice(0, idx + 1);
          const after = state.cards.slice(idx + 1);
          cards = [...before, action.card, ...after];
        } else {
          const before = state.cards.slice(0, idx);
          const after = state.cards.slice(idx);
          cards = [...before, action.card, ...after];
        }
      } else {
        if (state.displaySettings.appendCardToBottom) {
          cards = [...state.cards, action.card];
        } else {
          cards = [action.card, ...state.cards];
        }
      }
      return {
        ...state,
        cards,
      };
    }
    case 'UPDATE_CARD': {
      return {
        ...state,
        cards: state.cards.map((c) => {
          if (c === action.oldCard) {
            return action.newCard;
          }
          return c;
        }),
      };
    }
    case 'REMOVE_CARD': {
      return {
        ...state,
        cards: [...state.cards.filter((c) => c !== action.card)],
      };
    }

    case 'UPDATE_PARAGRAPHS': {
      return {
        ...state,
        paragraphs: action.paragraphs,
      };
    }

    case 'UPDATE_FONT_SIZE': {
      return {
        ...state,
        displaySettings: {
          ...state.displaySettings,
          fontSize: action.size,
        },
      };
    }
    case 'UPDATE_FONT_FAMILY': {
      return {
        ...state,
        displaySettings: {
          ...state.displaySettings,
          fontFamily: action.family,
        },
      };
    }
  }
}

@Injectable({
  providedIn: 'root',
})
export class AppService extends createStateService(reducer, initialState) {
  private wordToStem: Map<string, string>;

  private searchIndexArray: string[];
  private autocomplete: string[];

  constructor(private http: HttpClient) {
    super();

    this.searchIndexArray = this.buildIndexArray().sort();
  }

  async getSavedPages() {
    this.dispatch({
      type: 'UPDATE_PAGES',
      pages: [
        {
          queries: [],
          title: 'My Page',
        },
      ],
    });
  }

  removeCard(card: CardItem) {
    this.dispatch({
      type: 'REMOVE_CARD',
      card,
    });
  }

  private dispatchError(msg: string) {
    this.dispatch({
      type: 'UPDATE_ERROR',
      error: {
        msg,
      },
    });
    console.log(msg);
  }
  //#region Strongs

  async getStrongs(
    strongsNumber: string,
    dict: DictionaryType,
    nextToItem: CardItem = null
  ) {
    const result = await this.getStrongsFromApi(strongsNumber, dict);
    const d = dict === 'grk' ? 'G' : 'H';

    const card = {
      qry: `${d}${strongsNumber}`,
      dict: d,
      type: 'Strongs',
      data: result,
    };

    this.dispatch({
      type: 'ADD_CARD',
      card,
      nextToItem,
    });
  }

  private async getStrongsFromApi(strongsNumber: string, dict: string) {
    const sn = parseInt(strongsNumber, 10);
    const result = {
      prefix: '',
      sn,
      def: null,
      rmac: null,
      crossrefs: null,
      rmaccode: '',
    };

    if (dict === 'grk') {
      result.prefix = 'G';
      if (sn > 5624 || sn < 1) {
        this.dispatchError(
          `Strong's Number G${sn} is out of range. Strong's numbers range from 1 - 5624 in the New Testament.`
        );
        return;
      }
    } else {
      result.prefix = 'H';
      if (sn > 8674 || sn < 1) {
        this.dispatchError(
          `Strong's Number H${sn} is out of range. Strong's numbers range from 1 - 8674 in the Old Testament.`
        );
        return;
      }
    }

    let url = `${dict}${Math.ceil(sn / 100)}.json`;
    try {
      const d = await this.http
        .get<StrongsDefinition[]>('assets/data/strongs/' + url)
        .toPromise();
      result.def = d.find((el) => el.i === result.prefix + result.sn);
    } catch (err) {
      this.dispatchError(
        `Unable to retrieve Strong's Data for ${result.prefix}${result.sn}`
      );
      return;
    }

    try {
      const d = await this.http
        .get<StrongsCrossReference[]>(`assets/data/strongscr/cr${url}`)
        .toPromise();
      for (const cr of d) {
        if (cr.id.toUpperCase() === result.prefix + result.sn) {
          result.crossrefs = {
            id: cr.id, // strongs id H1|G1
            t: cr.t, // strongs testament grk|heb
            d: cr.d, // strongs word/data definition Aaron {ah-ar-ohn'}
            ss: cr.ss.map((ss) => {
              return {
                w: ss.w, // translated word
                rs: ss.rs.map((rs) => {
                  return {
                    r: rs.r.split(';').join(':'), // fix the reference...
                  };
                }),
              };
            }),
          };

          break;
        }
      }
    } catch (err) {
      this.dispatchError(
        `Unable to retrieve Strong\'s Cross References for ${result.prefix}${result.sn}`
      );

      return;
    }

    if (dict === 'grk') {
      url = `assets/data/rmac/rs${Math.ceil(sn / 1000)}.json`;
      let rmacCrossReferences: RMACCrossReference[];

      // rmac is a two get process.

      try {
        const d = await this.http.get<RMACCrossReference[]>(url).toPromise();
        rmacCrossReferences = d;
      } catch (err) {
        this.dispatchError('Unable to retrieve RMAC');
        return;
      }

      // deal with RMAC
      const tmp = rmacCrossReferences.filter((el, i) => {
        return el.i === sn + '';
      });

      if (tmp.length === 0) {
        return result;
      }

      result.rmaccode = tmp[0].r;
      if (result.rmaccode !== undefined) {
        url = `assets/data/rmac/r-${result.rmaccode.substring(0, 1)}.json`;

        try {
          const d = await this.http.get<RMACDefinition[]>(url).toPromise();
          for (const rmac of d) {
            if (rmac.id.toLowerCase() === result.rmaccode) {
              result.rmac = rmac;
              break;
            }
          }
        } catch (err) {
          this.dispatchError('Unable to retrieve RMAC');
          return;
        }
      }
    }
    return result;
  }
  //#endregion

  //#region Bible Passages

  async getPassage(ref: BibleReference, nextToItem: CardItem = null) {
    const card = await this.composeBiblePassageCardItem(ref);
    this.dispatch({
      type: 'ADD_CARD',
      card,
      nextToItem,
    });
  }

  async updatePassage(oldCard: CardItem, ref: BibleReference) {
    const newCard = await this.composeBiblePassageCardItem(ref);
    this.dispatch({
      type: 'UPDATE_CARD',
      oldCard,
      newCard,
    });
  }

  private async composeBiblePassageCardItem(ref: BibleReference) {
    const result = await this.getPassageFromApi(ref.Section);
    return {
      qry: ref.toString(),
      dict: ref.Section.start.book.book_number > 39 ? 'G' : 'H',
      type: 'Passage',
      data: result,
    };
  }

  private async getPassageFromApi(section: Section) {
    try {
      const chapters = []; // the verses from the chapter.
      const result = {
        cs: [],
        testament: '',
        ref: BibleReference.toString(section),
      };

      if (Number(section.start.chapter) > section.start.book.last_chapter) {
        this.dispatchError(
          `The requested chapter ${section.start.book.name} is out of range.  Please pick a chapter between 1 and ${section.end.book.last_chapter}.`
        );
        return;
      }

      if (Number(section.end.chapter) > section.end.book.last_chapter) {
        this.dispatchError(
          `The requested chapter ${section.end.book.name} is out of range.  Please pick a chapter between 1 and ${section.end.book.last_chapter}.`
        );
        return;
      }

      for (
        let i = Number(section.start.chapter);
        i <= Number(section.end.chapter);
        i++
      ) {
        try {
          const d = await this.http
            .get<BiblePassage>(
              `assets/data/bibles/kjv_strongs/${section.start.book.book_number}-${i}.json`
            )
            .toPromise();
          chapters.push(d);
        } catch (err) {
          this.dispatchError(`Unable to retrieve bible passage ${result.ref}.`);
          return;
        }
      }

      const passages: BiblePassage[] = [];

      // prep the passages
      for (let j = 0; j < chapters.length; j++) {
        const vss: BibleVerse[] = [];
        let start: number;
        let end: string | number;

        // figure out the start verse.
        if (j === 0) {
          if (section.start.verse.indexOf('*') !== -1) {
            // you sometimes use this as a shortcut to the last verse
            // replace the * with the last verse, then eval the expression.
            section.start.verse = section.start.verse.replace(
              '*',
              chapters[j].vss.length.toString()
            );

            start = math.evaluate(section.start.verse);

            // update the section and the ref.
            section.start.verse = start.toString();
            result.ref = BibleReference.toString(section);
          } else {
            start = parseInt(section.start.verse, 10);
          }
        } else {
          start = 1;
        }

        // figure out the end verse
        if (j + 1 === chapters.length) {
          end = section.end.verse;
        } else {
          end = '*';
        }

        // get the verses requested.
        const tvs = chapters[j].vss.length;
        if (end === '*' || parseInt(end, 10) > tvs) {
          end = tvs;
        }

        // we're using c based indexes here, so the index is 1 less than the verse #.
        for (let i = start; i <= end; i++) {
          vss.push(chapters[j].vss[i - 1]);
        }

        passages.push({
          ch: chapters[j].ch,
          vss,
        });
      }

      // convert into paragraphs.
      result.cs = await this.convertToParagraphPassages(passages, section);

      if (section.start.book.book_number >= 40) {
        result.testament = 'new';
      } else {
        result.testament = 'old';
      }

      return result;
    } catch (error) {
      this.dispatchError(`An unknown error occurred:  ${error}.`);
    }
  }

  private async convertToParagraphPassages(
    chapters: BiblePassage[],
    section: Section
  ) {
    let paragraphMarkers: HashTable<Paragraph> = null;

    if (this.getState().paragraphs === null) {
      paragraphMarkers = await this.getParagraphMarkers();
    } else {
      paragraphMarkers = this.getState().paragraphs;
    }

    const passages: BibleParagraphPassage[] = [];
    for (const ch of chapters) {
      const passage = {
        ch: ch.ch,
        paras: this.convertToParagraphs(ch, section, paragraphMarkers),
      };

      passages.push(passage);
    }

    return passages;
  }

  private async getParagraphMarkers(): Promise<HashTable<Paragraph>> {
    const paras = await this.http
      .get<HashTable<Paragraph>>('assets/data/bibles/paras.json')
      .toPromise();
    this.dispatch({
      type: 'UPDATE_PARAGRAPHS',
      paragraphs: paras,
    });
    return paras;
  }

  private convertToParagraphs(
    ch: BiblePassage,
    section: Section,
    paragraphMarkers: HashTable<Paragraph>
  ): BibleParagraph[] {
    // group the verses into paragraphs.

    // create an initial paragraph to hold verses that might come before a paragraph.
    let para = { p: { h: '', p: 0 }, vss: [] };
    const paras = [];
    const vss: BibleVerse[] = [];

    // for each verse in the chapter, break them into paragraphs.
    for (const v of ch.vss) {
      if (this.getRefKey(v, section) in paragraphMarkers) {
        paras.push(para);
        para = {
          p: paragraphMarkers[this.getRefKey(v, section)],
          vss: [v],
        };

        if (para.p === undefined) {
          para.p = { h: '', p: 0 };
        } // just in case you can't find a paragraph.
      } else {
        para.vss.push(v);
      }
    }

    // add the final paragraph if it has verses.
    if (para.vss.length > 0) {
      paras.push(para);
    }

    return paras;
  }

  private getRefKey(vs: BibleVerse, section: Section) {
    return BibleReference.formatReferenceKey(
      section.start.book.book_number,
      section.start.chapter,
      vs.v
    );
  }

  //#endregion

  //#region Word Search

  async getWords(qry: string, nextToItem: CardItem = null) {
    const result = await this.getWordsFromApi(qry);

    const card = {
      qry,
      dict: 'n/a',
      type: 'Words',
      data: result,
    };

    this.dispatch({
      type: 'ADD_CARD',
      card,
      nextToItem,
    });
  }

  private async getWordsFromApi(qry: string): Promise<WordLookupResult> {
    // its possible that this might get called before the word to stem map is build.  first time, check and populate...
    if (!this.wordToStem) {
      await this.getStemWordIndex();
    }

    // now carry on...
    const qs = this.normalizeQueryString(qry);
    const results: (readonly string[])[] = [];

    // Loop through each query term.
    for (const q of qs) {
      if (!this.wordToStem.has(q)) {
        this.dispatch({
          type: 'UPDATE_ERROR',
          error: {
            msg: `Unable to find the word "${q}" in any passages.`,
          },
        });
        return;
      }
      const stem = this.wordToStem.get(q);

      // handle the first case.
      if (stem <= this.searchIndexArray[0]) {
        results.unshift(
          await this.getSearchReferences(
            'assets/data/index/' + this.searchIndexArray[0] + 'idx.json',
            stem
          )
        );
        break;
      }

      // For each query term, figure out which xml file it is in, and get it.
      //   getSearchRefs returns an array of references.
      for (let w = 1; w < this.searchIndexArray.length; w++) {
        // If we are at the end of the array, we want to use a different test.
        if (
          stem <= this.searchIndexArray[w] &&
          stem > this.searchIndexArray[w - 1]
        ) {
          results.unshift(
            await this.getSearchReferences(
              'assets/data/index/' + this.searchIndexArray[w] + 'idx.json',
              stem
            )
          );
        }
      }
    } // End of loop through query terms

    // Now we need to test results.  If there is more than one item in the array, we need to find the set
    //  that is shared by all of them.  IF not, we can just return those refs.
    if (results.length === 0) {
      this.dispatch({
        type: 'UPDATE_ERROR',
        error: {
          msg: `No passages found for query: ${qry}.`,
        },
      });
      return;
    }

    if (results.length === 1) {
      // we go down this path if only one word was searched for
      return {
        refs: results[0],
        word: qry,
      };
    } else {
      // we go down this path if more than one word was searched for
      return {
        refs: this.findSharedSet(results),
        word: qry,
      };
    }
  }

  /**
   * Gets the references a given word is found in.
   * Returns a string[].
   * @param url - The url of the word index
   * @param query - The word to lookup.
   */
  private async getStemWordIndex() {
    this.wordToStem = new Map<string, string>();
    try {
      const r = await this.http
        .get<WordToStem[]>('assets/data/index/word_to_stem_idx.json')
        .toPromise();

      // find the right word
      for (const i of r) {
        this.wordToStem.set(i.w, i.s);
      }
    } catch (err) {
      this.dispatch({
        type: 'UPDATE_ERROR',
        error: {
          msg: err,
        },
      });
      return;
    }
  }

  /**
   * Gets the references a given word is found in.
   * Returns a string[].
   * @param url - The url of the word index
   * @param query - The word to lookup.
   */
  private async getSearchReferences(url: string, query: string) {
    // getSearchRefs takes a url and uses ajax to retrieve the references and returns an array of references.
    let r: IndexResult[];

    try {
      r = await this.http.get<IndexResult[]>(url).toPromise();
    } catch (err) {
      this.dispatch({
        type: 'UPDATE_ERROR',
        error: {
          msg: err,
        },
      });
      return;
    }
    // find the right word
    const refs = r.filter((o) => o.w === query);
    if (refs.length > 0) {
      return refs[0].r;
    } else {
      return [];
    }
  }

  private buildIndexArray() {
    const words: string[] = [];
    words.unshift('abishur');
    words.unshift('achor');
    words.unshift('adoni');
    words.unshift('afterward');
    words.unshift('ahishahar');
    words.unshift('alleg');
    words.unshift('ambush');
    words.unshift('ancestor');
    words.unshift('aphik');
    words.unshift('arbah');
    words.unshift('arodi');
    words.unshift('ashkenaz');
    words.unshift('ate');
    words.unshift('azaniah');
    words.unshift('backbiteth');
    words.unshift('barbarian');
    words.unshift('beard');
    words.unshift('begettest');
    words.unshift('benefactor');
    words.unshift('bethel');
    words.unshift('bilshan');
    words.unshift('blindeth');
    words.unshift('booti');
    words.unshift('breaketh');
    words.unshift('bucket');
    words.unshift('cabbon');
    words.unshift('caphtor');
    words.unshift('causeless');
    words.unshift('chapmen');
    words.unshift('chese');
    words.unshift('chrysoprasus');
    words.unshift('cloth');
    words.unshift('common');
    words.unshift('confess');
    words.unshift('contendeth');
    words.unshift('coucheth');
    words.unshift('crept');
    words.unshift('curseth');
    words.unshift('darius');
    words.unshift('decketh');
    words.unshift('dema');
    words.unshift('devil');
    words.unshift('directeth');
    words.unshift('disposit');
    words.unshift('doth');
    words.unshift('drowsi');
    words.unshift('ebe');
    words.unshift('elead');
    words.unshift('elkoshit');
    words.unshift('encourag');
    words.unshift('entreat');
    words.unshift('eschew');
    words.unshift('ever');
    words.unshift('expert');
    words.unshift('fallest');
    words.unshift('feedeth');
    words.unshift('filthi');
    words.unshift('fleeth');
    words.unshift('forborn');
    words.unshift('forsookest');
    words.unshift('fretteth');
    words.unshift('gahar');
    words.unshift('gazzam');
    words.unshift('gibea');
    words.unshift('glister');
    words.unshift('got');
    words.unshift('grope');
    words.unshift('hadlai');
    words.unshift('hammon');
    words.unshift('harbona');
    words.unshift('hasrah');
    words.unshift('hazezon');
    words.unshift('heinous');
    words.unshift('herebi');
    words.unshift('highest');
    words.unshift('holdeth');
    words.unshift('hosanna');
    words.unshift('huri');
    words.unshift('ill');
    words.unshift('inexcus');
    words.unshift('intend');
    words.unshift('ishui');
    words.unshift('jaazaniah');
    words.unshift('jaminit');
    words.unshift('jecoliah');
    words.unshift('jeopard');
    words.unshift('jethro');
    words.unshift('joiarib');
    words.unshift('juda');
    words.unshift('kelaiah');
    words.unshift('kishion');
    words.unshift('laden');
    words.unshift('laughter');
    words.unshift('lehi');
    words.unshift('lift');
    words.unshift('loatheth');
    words.unshift('lucius');
    words.unshift('madmen');
    words.unshift('malachi');
    words.unshift('march');
    words.unshift('maul');
    words.unshift('melchizedek');
    words.unshift('merrili');
    words.unshift('midianit');
    words.unshift('miri');
    words.unshift('modest');
    words.unshift('move');
    words.unshift('naashon');
    words.unshift('nazareth');
    words.unshift('nephishesim');
    words.unshift('nisan');
    words.unshift('obadiah');
    words.unshift('oliveyard');
    words.unshift('oren');
    words.unshift('overrun');
    words.unshift('pallu');
    words.unshift('pas');
    words.unshift('peel');
    words.unshift('pernici');
    words.unshift('philip');
    words.unshift('pison');
    words.unshift('plucketh');
    words.unshift('pour');
    words.unshift('price');
    words.unshift('proport');
    words.unshift('purg');
    words.unshift('rabboni');
    words.unshift('ravish');
    words.unshift('redeemedst');
    words.unshift('remainest');
    words.unshift('reput');
    words.unshift('revers');
    words.unshift('rissah');
    words.unshift('ruddi');
    words.unshift('said');
    words.unshift('sapphir');
    words.unshift('scepter');
    words.unshift('secundus');
    words.unshift('separ');
    words.unshift('shachia');
    words.unshift('sharar');
    words.unshift('sheepshear');
    words.unshift('sheva');
    words.unshift('shishak');
    words.unshift('shroud');
    words.unshift('signifi');
    words.unshift('sittest');
    words.unshift('slow');
    words.unshift('soft');
    words.unshift('sowedst');
    words.unshift('spoil');
    words.unshift('station');
    words.unshift('stoop');
    words.unshift('strongest');
    words.unshift('sum');
    words.unshift('sweep');
    words.unshift('tahapan');
    words.unshift('tast');
    words.unshift('ten');
    words.unshift('thereat');
    words.unshift('threaten');
    words.unshift('timbrel');
    words.unshift('tongu');
    words.unshift('travailest');
    words.unshift('trust');
    words.unshift('uncircumcis');
    words.unshift('unprepar');
    words.unshift('urg');
    words.unshift('vat');
    words.unshift('visiteth');
    words.unshift('wash');
    words.unshift('wed');
    words.unshift('wherewith');
    words.unshift('winepress');
    words.unshift('won');
    words.unshift('written');
    words.unshift('zalmonah');
    words.unshift('zenan');
    words.unshift('ziphim');
    words.unshift('zuzim');

    return words;
  }

  /*
   *  Returns a list of references in string form as a string[] that are shared
   *  given a list of lists of references in string form.
   */
  private findSharedSet(referenceSet: (readonly string[])[]) {
    const results = [];
    // FindSharedSet takes an array of reference arrays, and figures out
    // which references are shared by all arrays/sets, then returns a single
    // array of references.
    // tslint:disable-next-line: prefer-for-of
    for (let j = 0; j < referenceSet.length; j++) {
      const refs = referenceSet[j];
      if (refs != null) {
        for (let i = 0; i < refs.length; i++) {
          const r = refs[i].split(':');
          // convert references to single integers.
          //  Book * 100000000, Chapter * 10000, Verse remains same, add all together.
          results[j][i] = this.toReferenceNumber(r);
        }
      } else {
        return null;
      }
    }

    // get the first result
    let first = results[0];

    // for each additional result, get the shared set
    for (let i = 1; i < results.length; i++) {
      first = this.returnSharedSet(results[i], first);
    }

    // convert the references back into book, chapter and verse.
    for (let i = 0; i < first.length; i++) {
      const ref = first[i];
      first[i] = this.toReferenceString(ref);
    }

    return first;
  }

  private toReferenceString(ref: number) {
    return BibleReference.formatReferenceKey(
      Math.floor(ref / 100000000),
      Math.floor((ref % 100000000) / 10000),
      Math.floor((ref % 100000000) % 10000)
    );
  }

  private toReferenceNumber(r: string[]) {
    let ref = parseInt(r[0], 10) * 100000000;
    ref = ref + parseInt(r[1], 10) * 10000;
    ref = ref + parseInt(r[2], 10) * 1;
    return ref;
  }

  private returnSharedSet(x, y) {
    /// <summary>
    ///  Takes two javascript arrays and returns an array
    ///  containing a set of values shared by arrays.
    /// </summary>
    // declare iterator
    let i = 0;
    // declare terminator
    let t = x.length < y.length ? x.length : y.length;
    // sort the arrays
    x.sort((a, b) => a - b);
    y.sort((a, b) => a - b);
    // in this loop, we remove from the arrays, the
    //  values that aren't shared between them.
    while (i < t) {
      if (x[i] === y[i]) {
        i++;
      }

      if (x[i] < y[i]) {
        x.splice(i, 1);
      }

      if (x[i] > y[i]) {
        y.splice(i, 1);
      }

      t = x.length < y.length ? x.length : y.length;
      // we have to make sure to remove any extra values
      // at the end of an array when we reach the end of
      // the other.
      if (t === i && t < x.length) {
        x.splice(i, x.length - i);
      }

      if (t === i && t < y.length) {
        y.splice(i, x.length - i);
      }
    }
    // we could return y, because at this time, both arrays
    // are identical.
    return x;
  }

  private normalizeQueryString(qry: string): string[] {
    qry = qry.toLowerCase();
    return qry.replace(/'/g, '').replace(/\s+/g, ' ').split(' ');
  }

  //#endregion

  //#region Auto Complete

  async getAutoComplete(keyword: string) {
    if (!this.autocomplete) {
      // if you have't populated the word list yet, do so...
      const data = await this.http
        .get<WordToStem[]>('assets/data/index/word_to_stem_idx.json')
        .toPromise();
      this.autocomplete = data.map((o) => o.w);
    }

    let qry = keyword;
    let prefix = '';
    const idx = qry.lastIndexOf(';');
    const words: string[] = [];

    if (idx > -1) {
      qry = keyword.substr(idx + 1).trim();
      prefix = keyword.substr(0, idx).trim() + '; ';
    }

    if (qry.search(/[0-9]/i) === -1) {
      // its a word
      for (const item of BibleReference.Books) {
        if (
          item.name !== 'Unknown' &&
          (item.name.toLowerCase().indexOf(qry.toLowerCase()) > -1 ||
            item.short_name.toLowerCase().indexOf(qry.toLowerCase()) > -1)
        ) {
          words.push(prefix + item.name);
          if (words.length > 2) {
            break;
          }
        }
      }

      for (const item of this.autocomplete) {
        if (item.toLowerCase().indexOf(qry.toLowerCase()) > -1) {
          words.push(prefix + item);
          if (words.length > 6) {
            break;
          }
        }
      }

      this.dispatch({
        type: 'UPDATE_AUTOCOMPLETE',
        words,
      });
    } else if (qry.search(/(H|G)[0-9]/i) !== -1) {
      // its a strongs lookup
      if (qry.substr(0, 1).toUpperCase() === 'H') {
        const num = parseInt(qry.substr(1), 10);
        for (let x = num; x < num + 10 && x < 8675; x++) {
          words.push('H' + x);
        }
      } else if (qry.substr(0, 1).toUpperCase() === 'G') {
        const num = parseInt(qry.substr(1), 10);
        for (let x = num; x < num + 10 && x < 5625; x++) {
          words.push('G' + x);
        }
      }

      this.dispatch({
        type: 'UPDATE_AUTOCOMPLETE',
        words,
      });
    }
  }

  //#endregion
}