import { SorensenDiceSimilarity, DefaultTextParser, ConsoleLogger, RelativeSummarizerConfig, Summarizer, NullLogger, Sentence } from "ts-textrank";

//Only one similarity function implemented at this moment.
//More could come in future versions.
const sim = new SorensenDiceSimilarity()

//Only one text parser available a this moment
const parser = new DefaultTextParser()

//Do you want logging?
const logger = new ConsoleLogger()

//You can implement LoggerInterface for different behavior,
//or if you don't want logging, use this:
//const logger = new NullLogger()

//Set the summary length as a percentage of full text length
const ratio = .25 

//Damping factor. See "How it works" for more info.
const d = .85

//How do you want summary sentences to be sorted?
//Get sentences in the order that they appear in text:
const sorting = SORT_BY.OCCURRENCE
//Or sort them by relevance:
//const sorting = SORT_BY.SCORE
const config = new RelativeSummarizerConfig(ratio, sim, parser, d, sorting)

//Or, if you want a fixed number of sentences:
//const number = 5
//const config = new AbsoluteSummarizerConfig(number, sim, parser, d, sorting)    

const summarizer = new Summarizer(config, logger)

//Language is used for stopword removal.
//See https://github.com/fergiemcdowall/stopword for supported languages
const lang = "en"

const text = "...Text to summarize..."
//summary will be an array of sentences summarizing text
const summary = summarizer.summarize(text, lang)