File Management

/**
 * Add a file to the dropzone
 * @param file - File object to add
 */
addFile(file: File): void;

/**
 * Handle multiple files from drag/drop or file input
 * @param files - FileList or array of files to handle
 */
handleFiles(files: FileList | File[]): void;

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

// Add file programmatically
const file = new File(["content"], "example.txt", { type: "text/plain" });
dropzone.addFile(file);

// Handle files from input element
document.getElementById("file-input").addEventListener("change", function(e) {
  dropzone.handleFiles(e.target.files);
});

// Add files with metadata
const fileWithMetadata = new File(["data"], "document.pdf", { type: "application/pdf" });
fileWithMetadata.customProperty = "custom value";
dropzone.addFile(fileWithMetadata);

/**
 * Remove a specific file from the dropzone
 * @param file - File object to remove
 */
removeFile(file: File): void;

/**
 * Remove all files from the dropzone
 * @param cancelIfNecessary - Whether to cancel uploads in progress
 */
removeAllFiles(cancelIfNecessary?: boolean): void;

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

// Remove specific file
dropzone.on("addedfile", function(file) {
  // Add remove button
  const removeButton = document.createElement("button");
  removeButton.innerHTML = "Remove";
  removeButton.onclick = () => dropzone.removeFile(file);
  file.previewElement.appendChild(removeButton);
});

// Remove all files and cancel uploads
dropzone.removeAllFiles(true);

// Remove only completed files (don't cancel uploads)
dropzone.removeAllFiles(false);

/**
 * Validate a file and call done callback with result
 * @param file - File to validate
 * @param done - Callback function, call with error message to reject
 */
accept(file: File, done: (error?: string) => void): void;

const dropzone = new Dropzone("#my-dropzone", {
  url: "/upload",
  
  // Custom validation function
  accept: function(file, done) {
    // File size validation (already handled by maxFilesize option)
    if (file.size > 5 * 1024 * 1024) {
      done("File too large (max 5MB)");
      return;
    }
    
    // Custom filename validation
    if (file.name.includes("temp")) {
      done("Temporary files are not allowed");
      return;
    }
    
    // Async validation (e.g., check with server)
    fetch("/api/validate-file", {
      method: "POST",
      body: JSON.stringify({ name: file.name, size: file.size }),
      headers: { "Content-Type": "application/json" }
    })
    .then(response => response.json())
    .then(result => {
      if (result.valid) {
        done(); // Accept file
      } else {
        done(result.error); // Reject file
      }
    })
    .catch(() => done("Validation failed"));
  }
});

/**
 * Get all files that have been accepted for upload
 */
getAcceptedFiles(): File[];

/**
 * Get all files that have been rejected
 */
getRejectedFiles(): File[];

/**
 * Get files with a specific status
 * @param status - File status to filter by
 */
getFilesWithStatus(status: string): File[];

/**
 * Get files that are queued for upload
 */
getQueuedFiles(): File[];

/**
 * Get files that are currently uploading
 */
getUploadingFiles(): File[];

/**
 * Get files that have been added but not yet processed
 */
getAddedFiles(): File[];

/**
 * Get files that are either uploading or queued
 */
getActiveFiles(): File[];

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

// Monitor file states
setInterval(() => {
  console.log("Queued:", dropzone.getQueuedFiles().length);
  console.log("Uploading:", dropzone.getUploadingFiles().length);
  console.log("Active:", dropzone.getActiveFiles().length);
}, 1000);

// Get files by status
const completedFiles = dropzone.getFilesWithStatus(Dropzone.SUCCESS);
const errorFiles = dropzone.getFilesWithStatus(Dropzone.ERROR);

// Check if all files are uploaded
function allFilesComplete() {
  return dropzone.getActiveFiles().length === 0;
}

// Process only accepted files
dropzone.getAcceptedFiles().forEach(file => {
  console.log("Processing:", file.name);
});

/**
 * Add a file to the upload queue
 * @param file - File to enqueue
 */
enqueueFile(file: File): void;

/**
 * Add multiple files to the upload queue
 * @param files - Array of files to enqueue
 */
enqueueFiles(files: File[]): void;

const dropzone = new Dropzone("#my-dropzone", {
  url: "/upload",
  autoQueue: false, // Don't auto-queue files
  autoProcessQueue: false // Don't auto-process queue
});

// Manual queue management
dropzone.on("addedfile", function(file) {
  // Add file to queue when ready
  setTimeout(() => {
    dropzone.enqueueFile(file);
  }, 1000);
});

// Bulk enqueue files
const filesToUpload = dropzone.getAddedFiles();
dropzone.enqueueFiles(filesToUpload);

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

interface DropzoneFile extends File {
  // Standard File properties
  name: string;
  size: number;
  type: string;
  lastModified: number;
  
  // Dropzone-specific properties
  status: string; // File status constant
  accepted: boolean; // Whether file passed validation
  upload?: {
    progress: number; // Upload progress (0-100)
    total: number; // Total bytes to upload
    bytesSent: number; // Bytes uploaded so far
    filename: string; // Filename for upload
  };
  xhr?: XMLHttpRequest; // XMLHttpRequest object for upload
  previewElement?: HTMLElement; // DOM element for file preview
  previewTemplate?: string; // HTML template for preview
  width?: number; // Image width (for images)
  height?: number; // Image height (for images)
  
  // Custom properties can be added
  [key: string]: any;
}

// File status constants
const FILE_STATUS = {
  ADDED: "added",
  QUEUED: "queued",
  UPLOADING: "uploading", 
  CANCELED: "canceled",
  ERROR: "error",
  SUCCESS: "success"
};

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

dropzone.on("addedfile", function(file) {
  console.log("File added:", {
    name: file.name,
    size: file.size,
    type: file.type,
    status: file.status, // "added"
    accepted: file.accepted // undefined initially
  });
});

dropzone.on("processing", function(file) {
  console.log("File processing:", file.status); // "uploading"
});

dropzone.on("uploadprogress", function(file, progress, bytesSent) {
  console.log(`${file.name}: ${progress}% (${bytesSent}/${file.upload.total})`);
});

dropzone.on("success", function(file, response) {
  console.log("File completed:", file.status); // "success"
  file.serverResponse = response; // Add custom property
});

/**
 * Format file size for display
 * @param size - Size in bytes
 */
filesize(size: number): string;

/**
 * Get parameter name for file upload
 * @param n - File index
 */
_getParamName(n: number): string;

/**
 * Rename filename before upload
 * @param name - Original filename
 */
_renameFilename(name: string): string;

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

// Display formatted file sizes
dropzone.on("addedfile", function(file) {
  const sizeStr = dropzone.filesize(file.size);
  console.log(`${file.name} (${sizeStr})`);
});

// Custom file renaming
const dropzoneWithRename = new Dropzone("#my-dropzone", {
  url: "/upload",
  renameFilename: function(name) {
    return Date.now() + "_" + name; // Prefix with timestamp
  }
});