'use strict';
const qs = require('qs')
const axios = require('axios')
const Diff = require('diff')

const { createCoreService } = require('@strapi/strapi').factories;
const { ApplicationError } = require("@strapi/utils").errors

class Translator {
  constructor() {
    this.deeplApi = process.env.DEEPL_URL || 'api-free.deepl.com'
    this.deeplKey = process.env.DEEPL_KEY
    this.urlRequest = `https://${this.deeplApi}/v2/translate`
  }

  async get(origin, target, text) {
    try {
      const data = {
        auth_key: this.deeplKey,
        source_lang: origin,
        target_lang: target,
        text
      }
      const result = await axios.post(this.urlRequest, {
        text: Array.isArray(text) ? text : [text],
        source_lang: origin,
        target_lang: target,
      }, {
        headers: {
          Authorization: `DeepL-Auth-Key ${this.deeplKey}`,
          'Content-Type': 'application/json'
        }
      })

      return result.data
    } catch (error) {
      console.error('DeepL error:', error?.response?.data || error);
    }
  }
}

module.exports = createCoreService('api::parole.parole', ({strapi}) => ({
  async translate(origin, target, text) {
    const translator = new Translator()
    const data = await translator.get(origin, target, text)
    return data.translations[0].text
  },
  async translateLyrics(parolesFR) {
    const anglais = await this.translate('FR', 'EN', parolesFR)
    const espagnol = await this.translate('FR', 'ES', parolesFR)
    const allemand = await this.translate('FR', 'DE', parolesFR)
    const italien = await this.translate('FR', 'IT', parolesFR)

    return {
      francais: parolesFR,
      anglais: anglais + '\n\n (Translated by DeepL)',
      espagnol: espagnol + '\n\n (Traducido por DeepL)',
      allemand: allemand + '\n\n (Übersetzt von DeepL)',
      italien: italien + '\n\n (Tradotto da DeepL)'
    }
  },
  validateParoles(titre, transcription) {
    if (!titre || titre.trim().length === 0) {
      throw new ApplicationError('Champ obligatoire. Veuillez choisir un titre.');
    }

    if (!transcription || transcription.trim().length === 0) {
      throw new ApplicationError('Champ obligatoire. Veuillez renseigner la transcription.')
    }

    if (transcription.trim().length < 10) {
      throw new ApplicationError('La transcription doit contenir au moins 10 caractères.')
    }
  },
  parolesDiff(titre = '', oldString, newString) {
    const patch = Diff.createPatch(titre, oldString, newString, 'supprimée', 'ajoutée')
    const parsePatch = Diff.parsePatch(patch)

    if (parsePatch[0].hunks.length > 0) {
      const jsonDiff = Diff.diffWords(oldString, newString)

      return {
        patch,
        jsonDiff
      }
    }
  }
}));