const axios = require('axios');

const BASE_URL = "https://www.xeno-canto.org/api/2/recordings?query=";

function getCoords({ coords }) {
    if (!!coords) {
        if (!!coords.lat && !!coords.lon) {
            return `lat:${coords.lat} lon:${coords.lon}`;
        } else if (!!coords.box) {
            /** TODO box coordinates*/
        }
    }
}

function search(query) {
    let url;
    if (typeof (query) === 'string') {
        url = BASE_URL + query;
    } else if (typeof (query) === 'object') {
        const xeno_params = [
            { name: "" },
            { genus: 'gen:' },
            { recordist: 'rec:' },
            { country: 'cnt:' },
            { location: 'loc:' },
            { remarks: 'rmk:' },
            { coords: getCoords(query) },
            { also: 'also:' },
            { type: 'type:' },
            { nr: 'nr:' },
            { quality: 'q:' },
            { qualitylt: 'q<:' },
            { area: 'area:' }
        ];
        let url_params = xeno_params.reduce(function (acc, param) {
            const key = Object.keys(param)[0];
            if (!!query[key]) {
                if (key === 'coords') {
                    acc += param[key] + " ";
                } else {
                    acc += param[key] + query[key] + " ";
                }
            };
            return acc;
        }, "");
        url = BASE_URL + url_params;
    } else {
        throw new Error("Null query error");
    }
    return axios.get(url).then(response => {
        return response.data;
    }).catch(error => {
        throw error;
    });
}

module.exports = { search };