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import MatchResult from './match-result';
import MatchIndex from './match-index';
import type SearchFieldIndex from './search-field-index';
import type Item from '../item/item';
import type SearchQuery from './search-query';
const collator = new Intl.Collator(undefined, { sensitivity: 'base' });
export default class SearchEngine
{
static matchItems(items: Item[], searchQuery: SearchQuery): MatchResult[]
{
const matchResults = [];
const queryWords = searchQuery.getQueryWords();
let limit = searchQuery.getResultLimit();
for (let i = 0; i < items.length; i++)
{
if (limit === 0)
{
break;
}
const item = items[i];
if (item.isSelected() || !item.isSearchable() || item.isHidden() || !item.getEntity().isSearchable())
{
continue;
}
const matchResult = this.matchItem(item, queryWords);
if (matchResult)
{
matchResults.push(matchResult);
limit--;
}
}
return matchResults;
}
static matchItem(item: Item, queryWords: string[]): MatchResult
{
let matches = [];
for (let i = 0; i < queryWords.length; i++)
{
const queryWord = queryWords[i];
const results = this.matchWord(item, queryWord);
//const match = this.matchWord(item, queryWord);
//if (match === null)
if (results.length === 0)
{
return null;
}
else
{
matches = matches.concat(results);
//matches.push(match);
}
}
if (matches.length > 0)
{
return new MatchResult(item, queryWords, matches);
}
else
{
return null;
}
}
static matchWord(item: Item, queryWord: string): MatchIndex[]
{
const searchIndexes = item.getSearchIndex().getIndexes();
const matches = [];
for (let i = 0; i < searchIndexes.length; i++)
{
const fieldIndex: SearchFieldIndex = searchIndexes[i];
const indexes = fieldIndex.getIndexes();
for (let j = 0; j < indexes.length; j++)
{
const index = indexes[j];
const word = index.getWord().substring(0, queryWord.length);
if (collator.compare(queryWord, word) === 0)
{
matches.push(new MatchIndex(fieldIndex.getField(), queryWord, index.getStartIndex()));
//return new MatchIndex(field, queryWord, index[i][1]);
}
}
if (matches.length > 0)
{
break;
}
}
return matches;
//return null;
}
}