/*jshint esversion: 6 */

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

// `request` module is required for file upload.
// Use "npm install request" command to install.
var request = require("request");

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

// Source PDF file
const SourceFile = "./sample-rotated.pdf";
// Comma-separated list of page indices (or ranges) to process. Leave empty for all pages. Example: '0,2-5,7-'.
const Pages = "";
// PDF document password. Leave empty for unprotected documents.
const Password = "";
// Destination TXT file name
const DestinationFile = "./result.txt";

/*
Some of advanced options available through profiles:
(JSON can be single/double-quoted and contain comments.)
{
    "profiles": [
        {
            "profile1": {                
                "ExtractInvisibleText": true, // Invisible text extraction. Values: true / false
                "ExtractShadowLikeText": true, // Shadow-like text extraction. Values: true / false
                "ExtractAnnotations": true, // Whether to extract PDF annotations.
                "CheckPermissions": true, // Ignore document permissions. Values: true / false
                "DetectNewColumnBySpacesRatio": 1.2, // A ratio affecting number of spaces between words. 
            }
        }
    ]
}
*/

// Sample profile that sets advanced conversion options
// Advanced options are properties of CSVExtractor class from ByteScout PDF Extractor SDK used in the back-end:
// https://cdn.bytescout.com/help/BytescoutPDFExtractorSDK/html/87ce5fa6-3143-167d-abbd-bc7b5e160fe5.htm

/*
Valid RotationAngle values:
0 - no rotation
1 - 90 degrees
2 - 180 degrees
3 - 270 degrees
*/
const Profiles = '{ "profiles": [{ "profile1": { "RotationAngle": 1 } } ] }';


// Prepare URL for `PDF To TXT` API call
var query = `https://api.pdf.co/v1/pdf/convert/to/text`;
let reqOptions = {
    uri: query,
    headers: { "x-api-key": API_KEY },
    formData: {
        name: path.basename(DestinationFile),
        password: Password,
        pages: Pages,
        file: fs.createReadStream(SourceFile),
        profiles:Profiles
    }
};

// Send request
request.post(reqOptions, function (error, response, body) {
    if (error) {
        return console.error("Error: ", error);
    }

    // Parse JSON response
    let data = JSON.parse(body);
    if (data.error == false) {
        // Download TEXT file
        var file = fs.createWriteStream(DestinationFile);
        https.get(data.url, (response2) => {
            response2.pipe(file)
            .on("close", () => {
                console.log(`Generated TEXT file saved as "${DestinationFile}" file.`);
            });
        });
    }
    else {
        // Service reported error
        console.log("Error: " + data.message);
    }
});