var https = require("https");
var path = require("path");
var fs = require("fs");


// The authentication key (API Key).
// Get your own by registering at https://app.pdf.co
const API_KEY = "***********************************";


// Data to fill the template
const templateData = "./invoice_data.json";
// Destination PDF file name
const DestinationFile = "./result.pdf";

/* 
Please follow below steps to create your own HTML Template and get "templateId". 
1. Add new html template in app.pdf.co/templates/html
2. Copy paste your html template code into this new template. Sample HTML templates can be found at "https://github.com/bytescout/pdf-co-api-samples/tree/master/PDF%20from%20HTML%20template/TEMPLATES-SAMPLES"
3. Save this new template
4. Copy it’s ID to clipboard
5. Now set ID of the template into “templateId” parameter
*/

// HTML template using built-in template
// see https://app.pdf.co/templates/html/2/edit
const template_id = 2;


// Prepare request to `HTML To PDF` API endpoint
var queryPath = `/v1/pdf/convert/from/html?name=${path.basename(DestinationFile)}&async=True`;
var reqOptions = {
    host: "api.pdf.co",
    path: encodeURI(queryPath),
    method: "POST",
    headers: {
        "x-api-key": API_KEY,
        "Content-Type": "application/json"
    }
};


var requestBody = JSON.stringify({
    "templateId": template_id,
    "templateData": fs.readFileSync(templateData, "utf8"),
    "async": true
});
// Send request
var postRequest = https.request(reqOptions, (response) => {
    response.on("data", (d) => {
        // Parse JSON response
        var data = JSON.parse(d);        
        if (data.error == false) {
            console.log(`Job #${data.jobId} has been created!`);
            checkIfJobIsCompleted(data.jobId, data.url);
        }
        else {
            // Service reported error
            console.log(data.message);
        }
    });
}).on("error", (e) => {
    // Request error
    console.log(e);
});

// Write request data
postRequest.write(requestBody);
postRequest.end();


function checkIfJobIsCompleted(jobId, resultFileUrl) {
    let queryPath = `/v1/job/check`;

    // JSON payload for api request
    let jsonPayload = JSON.stringify({
        jobid: jobId
    });

    let reqOptions = {
        host: "api.pdf.co",
        path: queryPath,
        method: "POST",
        headers: {
            "x-api-key": API_KEY,
            "Content-Type": "application/json",
            "Content-Length": Buffer.byteLength(jsonPayload, 'utf8')
        }
    };

    // Send request
    var postRequest = https.request(reqOptions, (response) => {
        response.on("data", (d) => {
            response.setEncoding("utf8");

            // Parse JSON response
            let data = JSON.parse(d);
            console.log(`Checking Job #${jobId}, Status: ${data.status}, Time: ${new Date().toLocaleString()}`);

            if (data.status == "working") {
                // Check again after 3 seconds
				setTimeout(function(){ checkIfJobIsCompleted(jobId, resultFileUrl);}, 3000);
            }
            else if (data.status == "success") {
                // Download PDF file
                var file = fs.createWriteStream(DestinationFile);
                https.get(resultFileUrl, (response2) => {
                    response2.pipe(file)
                        .on("close", () => {
                            console.log(`Generated PDF file saved as "${DestinationFile}" file.`);
                        });
                });
            }
            else {
                console.log(`Operation ended with status: "${data.status}".`);
            }
        })
    });
    
    // Write request data
    postRequest.write(jsonPayload);
    postRequest.end();
}

{
    "invoice_id": "1234567",
    "invoice_date": "April 30, 2016",
    "invoice_dateDue": "May 15, 2016",
    "paid": false,
    "issuer_name": "Acme Inc",
    "issuer_company": "Acme International",
    "issuer_address": "City, Street 3rd",
    "issuer_email": "support@example.com",
    "issuer_website": "http://example.com",
    "client_name": "Food Delivery Inc.",
    "client_company": "Food Delivery International",
    "client_address": "New York, Some Street, 42",
    "client_email": "client@example.com",
    "items": [
        {
            "name": "Setting up new web-site",
            "price": 250
        },
        {
            "name": "Website Content Addition",
            "price": 700
        },
        {
            "name": "Database Setup",
            "price": 200
        },
        {
            "name": "Record Digitalization",
            "price": 1800
        },
        {
            "name": "Cloud Storage",
            "price": 500
        },
        {
            "name": "Short Messages",
            "price": 35
        },
        {
            "name": "Search Engine Optimization",
            "price": 200
        },
        {
            "name": "Priority Support",
            "price": 75
        },
        {
            "name": "Configuring mail server and mailboxes",
            "price": 50
        }
    ],
    "tax": 0.065,
    "discount": 0.01,
    "note": "Thank You For Your Business!"
}