const fs = require('fs');
const path = require('path');
const GroupDocsMergerCloud = require('@groupdocs/merger-cloud');

// ---------- Set up API credentials ----------
const client = new GroupDocsMergerCloud.ApiClient();
client.appSid = 'YOUR_APP_SID';
client.appKey = 'YOUR_APP_KEY';

// ---------- Initialize API instances ----------
const mergerApi = new GroupDocsMergerCloud.MergerApi(client);
const storageApi = new GroupDocsMergerCloud.StorageApi(client);

// ---------- Helper to upload a local file to cloud storage ----------
async function uploadFile(localPath, cloudPath) {
    const fileData = fs.readFileSync(localPath);
    const uploadRequest = new GroupDocsMergerCloud.UploadFileRequest({
        path: cloudPath,
        file: fileData
    });
    await storageApi.uploadFile(uploadRequest);
}

// ---------- Helper to download a cloud file to local storage ----------
async function downloadFile(cloudPath, localPath) {
    const downloadRequest = new GroupDocsMergerCloud.DownloadFileRequest({ path: cloudPath });
    const response = await storageApi.downloadFile(downloadRequest);
    fs.writeFileSync(localPath, response);
}

// ---------- Main execution ----------
(async () => {
    try {
        // 1. Upload source PDF to cloud storage
        const localInputPdf = path.resolve(__dirname, 'input.pdf');          // local source PDF
        const cloudInputPdf = 'input/input.pdf';                            // cloud path
        await uploadFile(localInputPdf, cloudInputPdf);
        console.log('Uploaded PDF to cloud storage.');

        // 2. Configure split options (example: split into two parts: pages 1‑2 and 3‑5)
        const splitOptions = new GroupDocsMergerCloud.SplitOptions({
            pages: ['1-2', '3-5']                                            // page ranges to split
        });

        // 3. Build split request
        const splitRequest = new GroupDocsMergerCloud.SplitDocumentRequest({
            fileInfo: new GroupDocsMergerCloud.FileInfo({ filePath: cloudInputPdf }),
            options: splitOptions
        });

        // 4. Execute split operation
        const splitResult = await mergerApi.splitDocument(splitRequest);
        console.log(`Split operation completed. ${splitResult.length} parts generated.`);

        // 5. Download each split part and save locally
        for (let i = 0; i < splitResult.length; i++) {
            const partInfo = splitResult[i];
            const localOutputPath = path.resolve(__dirname, `output_part_${i + 1}.pdf`);
            await downloadFile(partInfo.path, localOutputPath);
            console.log(`Saved split part ${i + 1} to ${localOutputPath}`);
        }

        // 6. (Optional) Clean up cloud storage – delete uploaded source file
        const deleteRequest = new GroupDocsMergerCloud.DeleteFileRequest({ path: cloudInputPdf });
        await storageApi.deleteFile(deleteRequest);
        console.log('Cleaned up source file from cloud storage.');
    } catch (error) {
        console.error('Error during PDF split process:', error);
    }
})();

# 1. Get an access token (replace YOUR_CLIENT_ID and YOUR_CLIENT_SECRET)
curl -X POST "https://api.groupdocs.cloud/v2.0/oauth2/token" \
     -H "Content-Type: application/x-www-form-urlencoded" \
     -d "grant_type=client_credentials&client_id=YOUR_CLIENT_ID&client_secret=YOUR_CLIENT_SECRET"

# 2. Upload the source PDF (replace YOUR_ACCESS_TOKEN and adjust paths)
curl -X PUT "https://api.groupdocs.cloud/v2.0/storage/file/input.pdf" \
     -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
     -H "Content-Type: application/pdf" \
     --data-binary @./input.pdf

# 3. Execute the split operation (pages 1-2 and 3-5)
curl -X POST "https://api.groupdocs.cloud/v2.0/merger/split" \
     -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
     -H "Content-Type: application/json" \
     -d '{
           "fileInfo": { "filePath": "input.pdf" },
           "options": { "pages": ["1-2","3-5"] }
         }'

# 4. Download each generated part (example for part 1)
curl -X GET "https://api.groupdocs.cloud/v2.0/storage/file/output_part_1.pdf" \
     -H "Authorization: Bearer YOUR_ACCESS_TOKEN" \
     -o ./output_part_1.pdf

npm install groupdocs-merger-cloud