const pool = require('../database/postgresql.js');
const axios = require('axios');
const config = require('../config/main.js')();

async function save_fiat() {
    if (!config['currency']['collecting']['fiat']) return;

    config['currency']['fiat'].forEach(
        (value) => config['currency']['fiat'].forEach(async (pair) => {
            if(value !== pair) {
                const res = await axios.get(
                    `https://duckduckgo.com/js/spice/currency/1/${value}/${pair}`,
                    {
                        timeout: 3000,
                    });

                const regExp = new RegExp('\\(\\s*(.*)\\s*\\);$', 'mg');
                const data = JSON.parse(Array.from(res.data.matchAll(regExp))[0][1]);

                delete data['terms'];
                delete data['privacy'];

                const point = data['to'][0]['mid'].toString().indexOf('.') + 4;

                pool.query('SELECT * FROM currency WHERE from_currency = $1 AND conv_currency = $2 AND date = $3',
                        [
                            value,
                            pair,
                            new Date(data['timestamp']).toLocaleDateString()
                        ]).then(async (db) => {
                        if (db['rows'][0]) return;

                        await pool.query(`INSERT INTO currency (from_currency, conv_currency, rate, date) 
                            VALUES ($1, $2, $3, $4) RETURNING *`,
                            [
                                value,
                                pair,
                                data['to'][0]['mid'].toString().slice(0, point),
                                new Date(data['timestamp']).toLocaleDateString()
                            ],
                        );
                });
            }
        })
    );
}

module.exports = save_fiat;