const path = require('path');
const fs = require('fs');
const FILE_PATH = path.resolve(__dirname, './last-modified-date.json');

require('dotenv').config({ path: path.resolve(__dirname, '../.env') });

// this function retrieve the users' data from Keystone
async function getLeads() {
    try {
        // here we consider tha last time we ran the connector
        let lastRunDate = ''; // we will use this to simplify the management of the leads
        let todayDate = new Date().toISOString().split('T')[0]; // we consider only the date 
        if (fs.existsSync(FILE_PATH)) {
            const file = fs.readFileSync(FILE_PATH, 'utf8');
            lastRunDate = JSON.parse(file).lastRun; 
        }
        else {
            // fallback date in case the file doesn't exist
            console.log('File not found.');
            const defaultDate = new Date();
            defaultDate.setDate(defaultDate.getDate() - 7);
            lastRunDate = defaultDate.toISOString().split('T')[0];  
        }

        const response = await fetch('https://smarthub.keystoneacademic.com/api/rest/getLead', {
            method: 'POST',
            headers: {
                'x-api-key': process.env.KEYSTONE_API_KEY,
                'Accept': 'application/json',
                'Content-type': 'application/json'
            },
            body: JSON.stringify({
                after: lastRunDate,
                before: todayDate,
                unsent: 1, // If this variable is set to 0, then it will show leads that have been marked as seen (old leads)
                test: 1, // If this is removed or set to 0, then all leads that are returned would be marked as seen. This allows you to only fetch new leads
            })
        });

        const result = await response.json(); 

        if (!response.ok || !Array.isArray(result?.data)) {
            console.log('API response empty or invalid: ', result);
            return [];
        }

        /*for (const lead of result.data) {
            console.log('ID: ', lead.id);
            console.log('First Name: ', lead.firstname);
            console.log('Last Name: ', lead.lastname);
            console.log('Email: ', lead.contact?.email ?? 'N/D');
            console.log('Phone: ', lead.contact?.phone ?? 'N/D');
            console.log('Program: ', lead.program?.name ?? 'N/D');
            console.log('--------------------------');
        }*/

        return result.data;
    }
    catch (error) {
        console.log("Error fetching the data: ", error);
        return []; 
    }
}

module.exports = { getLeads, FILE_PATH };