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

/*
The following options are available through profiles:
(JSON can be single/double-quoted and contain comments.)
{
    "profiles": [
        {
            "profile1": {
                "TextSmoothingMode": "HighQuality", // Valid values: "HighSpeed", "HighQuality"
                "VectorSmoothingMode": "HighQuality", // Valid values: "HighSpeed", "HighQuality"
                "ImageInterpolationMode": "HighQuality", // Valid values: "HighSpeed", "HighQuality"
                "RenderTextObjects": true, // Valid values: true, false
                "RenderVectorObjects": true, // Valid values: true, false
                "RenderImageObjects": true, // Valid values: true, false
                "RenderCurveVectorObjects": true, // Valid values: true, false
                "JPEGQuality": 85, // from 0 (lowest) to 100 (highest)
                "TIFFCompression": "LZW", // Valid values: "None", "LZW", "CCITT3", "CCITT4", "RLE"
                "RotateFlipType": "RotateNoneFlipNone", // RotateFlipType enum values from here: https://docs.microsoft.com/en-us/dotnet/api/system.drawing.rotatefliptype?view=netframework-2.0
                "ImageBitsPerPixel": "BPP24", // Valid values: "BPP1", "BPP8", "BPP24", "BPP32"
                "OneBitConversionAlgorithm": "OtsuThreshold", // Valid values: "OtsuThreshold", "BayerOrderedDithering"
                "FontHintingMode": "Default", // Valid values: "Default", "Stronger"
                "NightMode": false // Valid values: true, false
            }
        }
    ]
}*/



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

// 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.amazonaws.com/files/demo-files/cloud-api/pdf-to-image/sample.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 = "";
// Advanced options
const Profiles = "{ 'profiles': [ { 'profile1': { 'ImageBitsPerPixel': 'BPP1' } } ] }"

// Prepare request to `PDF To PNG` API endpoint
var queryPath = `/v1/pdf/convert/to/png`;

// JSON payload for api request
var jsonPayload = JSON.stringify({
    password: Password, pages: Pages, url: SourceFileUrl, profiles: Profiles
});

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')
    }
};
// Send request
var postRequest = https.request(reqOptions, (response) => {
    response.on("data", (d) => {
        // Parse JSON response
        var data = JSON.parse(d);        
        if (data.error == false) {
            // Download generated PNG files
            var page = 1;
            data.urls.forEach((url) => {
                var localFileName = `./page${page}.jpg`;
                var file = fs.createWriteStream(localFileName);
                https.get(url, (response2) => {
                    response2.pipe(file)
                    .on("close", () => {
                        console.log(`Generated JPEG file saved as "${localFileName}" file.`);
                    });
                });
                page++;
            }, this);
        }
        else {
            // Service reported error
            console.log(data.message);
        }
    });
}).on("error", (e) => {
    // Request error
    console.error(e);
});

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