var https = require("https");

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

// Direct URL of source PDF file.
// You can also upload your own file into PDF.co and use it as url. Check "Upload File" samples for code snippets: https://github.com/bytescout/pdf-co-api-samples/tree/master/File%20Upload/    
const SourceFileUrl = "https://bytescout-com.s3-us-west-2.amazonaws.com/files/demo-files/cloud-api/pdf-form/f1040.pdf";

// PDF document password. Leave empty for unprotected documents.
const Password = "";

// Runs processing asynchronously. Returns Use JobId that you may use with /job/check to check state of the processing (possible states: working, failed, aborted and success). Must be one of: true, false.
const async = false;

// Form field data
var fields = [
    {
        "fieldName": "topmostSubform[0].Page1[0].FilingStatus[0].c1_01[1]",
        "pages": "1",
        "text": "True"
    },
    {
        "fieldName": "topmostSubform[0].Page1[0].f1_02[0]",
        "pages": "1",
        "text": "John A."
    },        
    {
        "fieldName": "topmostSubform[0].Page1[0].f1_03[0]",
        "pages": "1",
        "text": "Doe"
    },        
    {
        "fieldName": "topmostSubform[0].Page1[0].YourSocial_ReadOrderControl[0].f1_04[0]",
        "pages": "1",
        "text": "123456789"
    },
    {
        "fieldName": "topmostSubform[0].Page1[0].YourSocial_ReadOrderControl[0].f1_05[0]",
        "pages": "1",
        "text": "Joan B."
    },
    {
        "fieldName": "topmostSubform[0].Page1[0].YourSocial_ReadOrderControl[0].f1_05[0]",
        "pages": "1",
        "text": "Joan B."
    },
    {
        "fieldName": "topmostSubform[0].Page1[0].YourSocial_ReadOrderControl[0].f1_06[0]",
        "pages": "1",
        "text": "Doe"
    },
    {
        "fieldName": "topmostSubform[0].Page1[0].YourSocial_ReadOrderControl[0].f1_07[0]",
        "pages": "1",
        "text": "987654321"
    }     
];


// * Fill forms *
// Prepare request to `PDF Edit` API endpoint
var queryPath = `/v1/pdf/edit/add`;

// JSON payload for api request
var jsonPayload = JSON.stringify({
    name: 'result.pdf',
    password: Password,
    url: SourceFileUrl,
    async: async,
    fields: fields
});

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

exports.handler = async (event) => {

    let dataString = '';
    const promise_response = await new Promise((resolve, reject) => {
        
        // Send request
        var postRequest = https.request(reqOptions, (response) => {
            response.on('data', chunk => {
                dataString += chunk;
            });
            
            response.on('end', () => {
                resolve({
                    statusCode: 200,
                    body: JSON.stringify(JSON.parse(dataString), null, 4)
                });
            });
              
        }).on("error", (e) => {
            reject({
                statusCode: 500,
                body: 'Something went wrong!'
            });
        });
        
        // Write request data
        postRequest.write(jsonPayload);
        postRequest.end();
    });

    return promise_response;
};