const americanOnly = require("./american-only.js");
const americanToBritishSpelling = require("./american-to-british-spelling.js");
const americanToBritishTitles = require("./american-to-british-titles.js");
const britishOnly = require("./british-only.js");

class Translator {
  translate(text, locale, highlight) {
    let translation = text;
    if (locale === "british-to-american") {
      translation = this.translateOneWay(britishOnly, translation, highlight);
      translation = this.translateTitles("british", translation, highlight);
      translation = this.translateSpelling("british", translation, highlight);
      translation = this.translateTime("british", translation, highlight);
    } else {
      translation = this.translateOneWay(americanOnly, translation, highlight);
      translation = this.translateTitles("american", translation, highlight);
      translation = this.translateSpelling("american", translation, highlight);
      translation = this.translateTime("american", translation, highlight);
    }
    if (translation === text) {
      return "Everything looks good to me!";
    }
    return translation;
  }

  translateOneWay(locale, translation, highlight) {
    for (let i in locale) {
      let replacement = locale[i];
      if (highlight === true) {
        replacement = '<span class="highlight">' + replacement + "</span>";
      }
      let regex = new RegExp(`(?<=[^a-zA-Z-]|^)${i}(?=[^a-zA-Z])`, "ig");
      translation = translation.replace(regex, replacement);
    }
    return translation;
  }

  translateTitles(from, translation, highlight) {
    for (let i in americanToBritishTitles) {
      let replacement, word;
      if (from === "american") {
        word = i;
        replacement = americanToBritishTitles[i];
      } else {
        word = americanToBritishTitles[i];
        replacement = i;
      }
      if (highlight === true) {
        replacement =
          '<span class="highlight">' +
          replacement.charAt(0).toUpperCase() +
          replacement.slice(1) +
          "</span>";
      } else {
        replacement =
          replacement.charAt(0).toUpperCase() + replacement.slice(1);
      }
      let regex = new RegExp(`(?<=[^a-zA-Z]|^)${word}(?=[^a-zA-Z])`, "ig");
      translation = translation.replace(regex, replacement);
    }
    return translation;
  }

  translateSpelling(from, translation, highlight) {
    for (let i in americanToBritishSpelling) {
      let replacement, word;
      if (from === "american") {
        word = i;
        replacement = americanToBritishSpelling[i];
      } else {
        word = americanToBritishSpelling[i];
        replacement = i;
      }
      if (highlight === true) {
        replacement = '<span class="highlight">' + replacement + "</span>";
      }
      let regex = new RegExp(`(?<=[^a-zA-Z]|^)${word}(?=[^a-zA-Z])`, "ig");
      translation = translation.replace(regex, replacement);
    }
    return translation;
  }

  translateTime(from, translation, highlight) {
    let char;
    let replacement;
    if (from === "british") {
      char = ".";
      replacement = ":";
    } else {
      char = ":";
      replacement = ".";
    }
    let regex = new RegExp(`\\d\\d?[${char}]\\d{2}`, "gi");
    let matches = translation.match(regex);
    for (let i in matches) {
      let tempRegex = new RegExp(`(?<=\\d\\d?)[${char}](?=\\d{2})`, "gi");
      let temp = matches[i].replace(tempRegex, replacement);
      if (highlight === true) {
        temp = '<span class="highlight">' + temp + "</span>";
      }
      translation = translation.replace(matches[i], temp);
    }
    return translation;
  }
}

module.exports = Translator;