require('dotenv').config();
const debug = require('debug')('soundbirder:api:quizz');
const debugResponses = require('debug')('soundbirder:api:responses');
const cache = require('./cache');
const eBird = require('@unclesamulus/ebird-api')(process.env.EBIRD_API_KEY);
const XenoCanto = require('@unclesamulus/xeno-canto-api');
const { choices, choice } = require('../utils/choices');

function questionKey(region, locale, size) {
    return `${region}:${locale}#${size}`;
}

async function getQuestionCached(region, locale, size) {
    let key = questionKey(region, locale, size);
    let quizz = await cache.pop(key);
    if (!quizz) {
        quizz = generateQuestion(region, locale, size);
        cache.push(key, quizz);
    }
    return quizz;
}

async function cacheQuestion(region, locale, size) {
    let quizz = await generateQuestion(region, locale, size);
    let key = questionKey(region, locale, size);
    cache.push(key, quizz);
    return quizz;
}

async function generateQuestion(region, locale, nb_propositions) {
    const quizz = {}
    try {
        let speciesSelection = [];
        do {
            speciesSelection = await getSpeciesSelection(region, nb_propositions);
        } while (speciesSelection == []);
        debugResponses(`Species selection: ${speciesSelection}`);
        const speciesSelectionLocalized = await getLocalizedNames(speciesSelection, locale);
        if (!speciesSelectionLocalized) {
            throw 'Not localized';
        }
        debugResponses('Localized species selection:', speciesSelectionLocalized);
        quizz.species = speciesSelectionLocalized;
        debug("Got species selection", quizz.species);
        let answer;
        do {
            answer = choice(speciesSelectionLocalized);
            quizz.answer = answer;
            quizz.audio = await getAudio(answer.sciName);
            if (quizz.audio === undefined) {
                debug("No audio found for species", answer.sciName);
                debug("Trying again...");
            }
        } while (quizz.audio === undefined);
        debug("Got answer", answer);
        debug("Got audio", quizz.audio);
    } catch (error) {
        debug("Error raised while generating quizz");
        console.error(error);
    }
    return quizz;
}

async function generateQuizz(region, locale, nb_questions) {
    let questions = [];
    let answers = [];
    const species_in_region = await getSpeciesList(region);
    const species_in_region_localized = await getLocalizedNames(species_in_region, locale);
    console.error(species_in_region_localized);
    for (let i=0; i < nb_questions; i++) {
        try {
            let question_species = choice(species_in_region_localize);
            let question_audio = await getAudio(question_species.sciName);
            questions.push(question_audio);
            answers.push(question_species);
        } catch (error) {
            console.error(error);
        }
    }
    return {questions: questions, answers: answers, propositions: species_in_region_localized};
}

async function getSpeciesSelection(region, number) {
    const regionCode = region;
    const speciesList = await getSpeciesList(regionCode);
    const speciesSelection = choices(speciesList, number);
    return speciesSelection;
}


async function getLocalizedNames(speciesCodes, locale) {
    const localizedNames = [];
    for (const speciesCode of speciesCodes) {
        const localized = await getLocalizedName(speciesCode, locale);
        if (!localized.sciName.includes(" x ")) 
            localizedNames.push(localized);
    }
    return localizedNames;
}

function getLocalizedName(speciesCode, locale) {
    return eBird.ref.taxonomy.ebird({
        fmt: 'json',
        locale: locale,
        species: speciesCode
    }).then(
        response => {
            const names = response[0];
            debug("Got localized species names");
            debugResponses(names);
            return names;
        }
    ).catch(error => {
        throw error;
    });
}

async function getSpeciesList(regionCode) {
    const cached = await cache.getCached(`spplist-${regionCode}`);
    if (cached) {
        if (cached != []) {
            return cached;
        } else {
            console.log("Empty cached species list, retrieving again");
        }
    } else {
        return eBird.product.spplist.in(regionCode)()
            .then(species => {
                cache.cacheResponse(`spplist-${regionCode}`, species);
                return species;
            })
            .catch(error => {
                throw error;
            });
    }
}

function getAudio(speciesScientificName) {
    return XenoCanto.search({
        name: speciesScientificName,
        quality: 'A'
    }).then(response => {
        const { recordings } = response;
        const randomRecord = choice(recordings);
        const audio = randomRecord.file;
        return audio;
    }).catch(error => {
        throw error;
    });
}


async function getSpeciesCompletion(region, locale, term) {
    let speciesList = await getSpeciesList(region);
    let localizedSpeciesList = await getLocalizedNames(speciesList, locale);
    let termLower = term.toLowerCase();
    let speciesCompletion = localizedSpeciesList.filter(speciesNames => {
        let { comName, sciName } = speciesNames;
        let name = comName.toLowerCase();
        let sci = sciName.toLowerCase();
        return name.includes(termLower) || sci.includes(termLower);
    });
    return speciesCompletion;
}

module.exports = {
    generateQuestion,
    getQuestionCached,
    getSpeciesCompletion,
    cacheQuestion,
    generateQuizz
}