Upload Processing

/**
 * Process all files in the upload queue
 */
processQueue(): void;

/**
 * Process a single file
 * @param file - File to process
 */
processFile(file: File): void;

/**
 * Process multiple files
 * @param files - Array of files to process
 */
processFiles(files: File[]): void;

const dropzone = new Dropzone("#my-dropzone", {
  url: "/upload",
  autoProcessQueue: false, // Manual queue processing
  parallelUploads: 3 // Process up to 3 files simultaneously
});

// Process queue manually
document.getElementById("upload-btn").addEventListener("click", () => {
  dropzone.processQueue();
});

// Process specific files
const selectedFiles = dropzone.getQueuedFiles().slice(0, 2);
dropzone.processFiles(selectedFiles);

// Process single file
dropzone.on("addedfile", function(file) {
  if (file.type.startsWith("image/")) {
    // Process images immediately
    dropzone.processFile(file);
  }
});

/**
 * Upload a single file
 * @param file - File to upload
 */
uploadFile(file: File): void;

/**
 * Upload multiple files
 * @param files - Array of files to upload
 */
uploadFiles(files: File[]): void;

/**
 * Cancel an ongoing upload
 * @param file - File upload to cancel
 */
cancelUpload(file: File): void;

const dropzone = new Dropzone("#my-dropzone", {
  url: "/upload",
  autoProcessQueue: false
});

// Direct upload without queue
dropzone.on("addedfile", function(file) {
  if (file.size < 1024 * 1024) { // Upload small files immediately
    dropzone.uploadFile(file);
  }
});

// Batch upload
const filesToUpload = dropzone.getAcceptedFiles();
dropzone.uploadFiles(filesToUpload);

// Cancel upload functionality
dropzone.on("addedfile", function(file) {
  const cancelBtn = document.createElement("button");
  cancelBtn.innerHTML = "Cancel";
  cancelBtn.onclick = () => dropzone.cancelUpload(file);
  file.previewElement.appendChild(cancelBtn);
});

// Cancel all uploads
function cancelAllUploads() {
  dropzone.getUploadingFiles().forEach(file => {
    dropzone.cancelUpload(file);
  });
}

interface UploadOptions {
  /** Upload URL */
  url: string;
  /** HTTP method (default: "post") */
  method?: string;
  /** Whether to send credentials with CORS requests */
  withCredentials?: boolean;
  /** Maximum number of parallel uploads */
  parallelUploads?: number;
  /** Whether to send multiple files in one request */
  uploadMultiple?: boolean;
  /** Parameter name for the file */
  paramName?: string;
  /** Additional parameters to send */
  params?: object;
  /** Custom headers for upload requests */
  headers?: object;
  /** Whether to automatically process the queue */
  autoProcessQueue?: boolean;
  /** Timeout for upload requests in milliseconds */
  timeout?: number;
}

// Standard upload configuration
const dropzone = new Dropzone("#my-dropzone", {
  url: "/api/upload",
  method: "PUT",
  parallelUploads: 5,
  params: {
    userId: "123",
    category: "documents"
  },
  headers: {
    "Authorization": "Bearer " + token,
    "X-Custom-Header": "value"
  }
});

// Multiple file upload in single request
const multiUploadDropzone = new Dropzone("#multi-upload", {
  url: "/api/batch-upload",
  uploadMultiple: true,
  parallelUploads: 1, // Only one batch at a time
  paramName: "files" // All files under 'files' parameter
});

// Custom parameter names for multiple files
const customParamDropzone = new Dropzone("#custom-params", {
  url: "/upload",
  paramName: function(n) {
    return "file_" + n; // file_0, file_1, etc.
  }
});

/**
 * Update total upload progress across all files
 */
updateTotalUploadProgress(): void;

// Progress tracking through events
on("uploadprogress", (file: File, progress: number, bytesSent: number) => void): void;
on("totaluploadprogress", (totalProgress: number, totalBytes: number, totalBytesSent: number) => void): void;

const dropzone = new Dropzone("#my-dropzone", { url: "/upload" });

// Track individual file progress
dropzone.on("uploadprogress", function(file, progress, bytesSent) {
  console.log(`${file.name}: ${Math.round(progress)}% (${bytesSent} bytes sent)`);
  
  // Update progress bar
  const progressBar = file.previewElement.querySelector(".progress-bar");
  if (progressBar) {
    progressBar.style.width = progress + "%";
  }
});

// Track total progress across all files
dropzone.on("totaluploadprogress", function(totalProgress, totalBytes, totalBytesSent) {
  console.log(`Total: ${Math.round(totalProgress)}% (${totalBytesSent}/${totalBytes} bytes)`);
  
  // Update overall progress indicator
  document.getElementById("total-progress").style.width = totalProgress + "%";
});

// Manual progress update
dropzone.updateTotalUploadProgress();

/**
 * Submit the upload request
 * @param xhr - XMLHttpRequest object
 * @param formData - FormData containing files and parameters
 * @param files - Array of files being uploaded
 */
submitRequest(xhr: XMLHttpRequest, formData: FormData, files: File[]): void;

/**
 * Handle successful upload completion
 * @param files - Uploaded files
 * @param responseText - Server response
 * @param e - XMLHttpRequest event
 */
_finished(files: File[], responseText: string, e: Event): void;

/**
 * Handle upload errors
 * @param files - Files that failed
 * @param message - Error message
 * @param xhr - XMLHttpRequest object
 */
_errorProcessing(files: File[], message: string, xhr?: XMLHttpRequest): void;

const dropzone = new Dropzone("#my-dropzone", {
  url: "/upload",
  
  // Custom request handling
  init: function() {
    this.on("sending", function(file, xhr, formData) {
      // Modify request before sending
      formData.append("timestamp", Date.now());
      formData.append("fileId", generateUniqueId());
      
      // Custom headers
      xhr.setRequestHeader("X-File-Name", file.name);
    });
    
    this.on("success", function(file, response) {
      console.log("Upload successful:", response);
      // Parse JSON response
      try {
        const data = JSON.parse(response);
        file.serverId = data.id;
        file.serverUrl = data.url;
      } catch (e) {
        console.log("Response is not JSON:", response);
      }
    });
    
    this.on("error", function(file, errorMessage, xhr) {
      console.error("Upload failed:", errorMessage);
      if (xhr) {
        console.error("Status:", xhr.status);
        console.error("Response:", xhr.responseText);
      }
    });
  }
});

// Custom request processing
function customSubmitRequest(xhr, formData, files) {
  // Add authentication
  xhr.setRequestHeader("Authorization", "Bearer " + getAuthToken());
  
  // Add CSRF token
  formData.append("_token", getCsrfToken());
  
  // Custom upload logic
  xhr.upload.addEventListener("progress", function(e) {
    if (e.lengthComputable) {
      const progress = (e.loaded / e.total) * 100;
      console.log("Custom progress:", progress);
    }
  });
}

/**
 * Get files associated with specific XMLHttpRequest
 * @param xhr - XMLHttpRequest object
 */
_getFilesWithXhr(xhr: XMLHttpRequest): File[];

const dropzone = new Dropzone("#my-dropzone", {
  url: "/upload",
  parallelUploads: 2,
  
  init: function() {
    // Custom queue management
    this.on("processing", function(file) {
      console.log("Started processing:", file.name);
      
      // Track processing files
      if (!this.processingFiles) {
        this.processingFiles = new Set();
      }
      this.processingFiles.add(file);
    });
    
    this.on("queuecomplete", function() {
      console.log("All files processed");
      this.processingFiles.clear();
    });
    
    // Handle upload errors with retry logic
    this.on("error", function(file, errorMessage, xhr) {
      if (xhr && xhr.status >= 500) {
        // Server error - retry upload
        setTimeout(() => {
          this.enqueueFile(file);
        }, 5000);
      }
    });
  }
});

// Pause/resume queue processing
function pauseUploads(dropzone) {
  dropzone.autoProcessQueue = false;
  // Cancel current uploads
  dropzone.getUploadingFiles().forEach(file => {
    dropzone.cancelUpload(file);
  });
}

function resumeUploads(dropzone) {
  dropzone.autoProcessQueue = true;
  dropzone.processQueue();
}

// Configuration for batch uploads
interface BatchUploadOptions {
  uploadMultiple: true;
  parallelUploads: number; // Number of batches to process simultaneously
  maxFiles?: number; // Total file limit
}

// Batch upload configuration
const batchDropzone = new Dropzone("#batch-upload", {
  url: "/api/batch-upload",
  uploadMultiple: true,
  parallelUploads: 1, // One batch at a time
  maxFiles: 20,
  
  init: function() {
    this.on("sendingmultiple", function(files, xhr, formData) {
      console.log("Sending batch of", files.length, "files");
      formData.append("batchId", generateBatchId());
    });
    
    this.on("successmultiple", function(files, response) {
      console.log("Batch upload successful:", response);
      files.forEach((file, index) => {
        file.serverId = response.ids[index];
      });
    });
    
    this.on("errormultiple", function(files, errorMessage) {
      console.error("Batch upload failed:", errorMessage);
      // Handle batch failures
    });
  }
});

// Process files in custom batches
function processBatches(dropzone, batchSize = 5) {
  const queuedFiles = dropzone.getQueuedFiles();
  
  for (let i = 0; i < queuedFiles.length; i += batchSize) {
    const batch = queuedFiles.slice(i, i + batchSize);
    dropzone.processFiles(batch);
  }
}