/*
  
*/

import { ParsingContext, Refiner } from "../../chrono";
import { ParsingResult } from "../../results";

export default class OverlapRemovalRefiner implements Refiner {
    refine(context: ParsingContext, results: ParsingResult[]): ParsingResult[] {
        if (results.length < 2) {
            return results;
        }

        const filteredResults = [];

        let prevResult = results[0];
        for (let i = 1; i < results.length; i++) {
            const result = results[i];

            // If overlap, compare the length and discard the shorter one
            if (result.index < prevResult.index + prevResult.text.length) {
                if (result.text.length > prevResult.text.length) {
                    prevResult = result;
                }
            } else {
                filteredResults.push(prevResult);
                prevResult = result;
            }
        }

        // The last one
        if (prevResult != null) {
            filteredResults.push(prevResult);
        }

        return filteredResults;
    }
}