let p = new Phrase("The dog likes cheese.")
p.generatePun().then((response) => {
    console.log(response)
})

const util = require("./util.js");
const wordsApi = require("./rhymeApi.js");

const letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

class Phrase {
    constructor(string, badwords = ["the", "on"]) {
        this.tokens = string.split(" ");
        this.badwords = badwords;
    }

    generatePun() {

        let nonBadWordsIndices = [];
        for (let i = 0; i < this.tokens.length; i++) {
            if (!this.badwords.includes(this.tokens[i].toLowerCase())) {
                nonBadWordsIndices.push(i)
            }
        }



        let replaceIndex = util.getRandomElement(nonBadWordsIndices);
        let wordToBePunned = this.tokens[replaceIndex];

        const isCapitalized = wordToBePunned[0] === wordToBePunned[0].toUpperCase();
        const isAllCaps = wordToBePunned === wordToBePunned.toUpperCase();
        const punctuation= wordToBePunned[wordToBePunned.length - 1];
        const isPunctuated = !letters.includes(punctuation);

        if (isPunctuated) {
            wordToBePunned = wordToBePunned.slice(0, wordToBePunned.length - 1)
        }

        return wordsApi.getRhyme(wordToBePunned).then((rhymes) => {
            let rhyme = util.getRandomElement(rhymes).word;
            if (isCapitalized) {
                rhyme = rhyme.replace(/bw/g, l => l.toUpperCase())
            }
            if (isAllCaps) {
                rhyme = rhyme.toUpperCase();
            }
            if (isPunctuated) {

                rhyme = rhyme + punctuation
            }



            let punnedPhrase = this.tokens.slice();
            punnedPhrase.splice(replaceIndex, 1, rhyme);
            return punnedPhrase.join(" ")

        }).catch((err) => {
            return "Error in generating pun: " + err;
        });

    }

    toString() {
        return this.tokens.join(" ");
    }
}

module.exports = Phrase;

let getRandomElement = (array) => {
    return array[Math.floor(Math.random()*array.length)];
}

//returns random int in [0, stop)
let getRandomIntInRange = (stop) => {
    return Math.floor(Math.random()*stop)
}


module.exports = {
    getRandomElement,
    getRandomIntInRange
}

const rp = require('request-promise');

const options = {
    method: 'GET',
    uri: 'https://api.datamuse.com',
    json: true
}


let getRhyme = (word) => {
    let rhymeOptions = Object.assign({}, options);
    rhymeOptions.uri += '/words?rel_rhy=' + word;
    return rp(rhymeOptions)
}




module.exports = {
    getRhyme
}