/**
 * @license
 * Copyright (c) 2016 - 2026 Vaadin Ltd.
 * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
 */
import type { Constructor } from '@open-wc/dedupe-mixin';
import type { I18nMixinClass } from '@vaadin/component-base/src/i18n-mixin.js';

export interface UploadFile extends File {
  uploadTarget: string;
  elapsed: number;
  elapsedStr: string;
  remaining: number;
  remainingStr: string;
  progress: number;
  speed: number;
  totalStr: string;
  loaded: number;
  loadedStr: string;
  status: string;
  error: string;
  abort?: boolean;
  complete?: boolean;
  held?: boolean;
  uploading?: boolean;
}

export interface UploadI18n {
  dropFiles?: {
    one?: string;
    many?: string;
  };
  addFiles?: {
    one?: string;
    many?: string;
  };
  error?: {
    tooManyFiles?: string;
    fileIsTooBig?: string;
    incorrectFileType?: string;
  };
  uploading?: {
    status?: {
      connecting?: string;
      stalled?: string;
      processing?: string;
      held?: string;
    };
    remainingTime?: {
      prefix?: string;
      unknown?: string;
    };
    error?: {
      serverUnavailable?: string;
      unexpectedServerError?: string;
      forbidden?: string;
      fileTooLarge?: string;
    };
  };
  units?: {
    size?: string[];
    sizeBase?: number;
  };

  formatSize?(bytes: number): string;

  formatTime?(seconds: number, units: number[]): string;
}

export type UploadMethod = 'POST' | 'PUT';

export type UploadFormat = 'raw' | 'multipart';

export declare function UploadMixin<T extends Constructor<HTMLElement>>(
  base: T,
): Constructor<UploadMixinClass> & Constructor<I18nMixinClass<UploadI18n>> & T;

export declare class UploadMixinClass {
  /**
   * If true, the user cannot interact with this element.
   */
  disabled: boolean;

  /**
   * Define whether the element supports dropping files on it for uploading.
   * By default it's enabled in desktop and disabled in touch devices
   * because mobile devices do not support drag events in general. Setting
   * it false means that drop is enabled even in touch-devices, and true
   * disables drop in all devices.
   */
  nodrop: boolean;

  /**
   * The server URL. The default value is an empty string, which means that
   * _window.location_ will be used.
   */
  target: string;

  /**
   * HTTP Method used to send the files. Only POST and PUT are allowed.
   */
  method: UploadMethod;

  /**
   * Key-Value map to send to the server. If you set this property as an
   * attribute, use a valid JSON string, for example:
   * ```html
   * <vaadin-upload headers='{"X-Foo": "Bar"}'></vaadin-upload>
   * ```
   */
  headers: object | string | null;

  /**
   * Max time in milliseconds for the entire upload process, if exceeded the
   * request will be aborted. Zero means that there is no timeout.
   */
  timeout: number;

  /**
   * The array of files being processed, or already uploaded.
   *
   * Each element is a [`File`](https://developer.mozilla.org/en-US/docs/Web/API/File)
   * object with a number of extra properties  to track the upload process:
   * - `uploadTarget`: The target URL used to upload this file.
   * - `elapsed`: Elapsed time since the upload started.
   * - `elapsedStr`: Human-readable elapsed time.
   * - `remaining`: Number of seconds remaining for the upload to finish.
   * - `remainingStr`: Human-readable remaining time for the upload to finish.
   * - `progress`: Percentage of the file already uploaded.
   * - `speed`: Upload speed in kB/s.
   * - `size`: File size in bytes.
   * - `totalStr`: Human-readable total size of the file.
   * - `loaded`: Bytes transferred so far.
   * - `loadedStr`: Human-readable uploaded size at the moment.
   * - `status`: Status of the upload process.
   * - `error`: Error message in case the upload failed.
   * - `abort`: True if the file was canceled by the user.
   * - `complete`: True when the file was transferred to the server.
   * - `uploading`: True while transferring data to the server.
   */
  files: UploadFile[];

  /**
   * Limit of files to upload, by default it is unlimited. If the value is
   * set to one, native file browser will prevent selecting multiple files.
   * @attr {number} max-files
   */
  maxFiles: number;

  /**
   * Specifies if the maximum number of files have been uploaded
   * @attr {boolean} max-files-reached
   */
  readonly maxFilesReached: boolean;

  /**
   * Specifies the types of files that the server accepts.
   * Syntax: a comma-separated list of MIME type patterns (wildcards are
   * allowed) or file extensions.
   * Notice that MIME types are widely supported, while file extensions
   * are only implemented in certain browsers, so avoid using it.
   * Example: accept="video/*,image/tiff" or accept=".pdf,audio/mp3"
   */
  accept: string;

  /**
   * Specifies the maximum file size in bytes allowed to upload.
   * Notice that it is a client-side constraint, which will be checked before
   * sending the request. Obviously you need to do the same validation in
   * the server-side and be sure that they are aligned.
   * @attr {number} max-file-size
   */
  maxFileSize: number;

  /**
   * Specifies the 'name' property at Content-Disposition for multipart uploads.
   * This property is ignored when uploadFormat is 'raw'.
   * @attr {string} form-data-name
   */
  formDataName: string;

  /**
   * Prevents upload(s) from immediately uploading upon adding file(s).
   * When set, you must manually trigger uploads using the `uploadFiles` method
   * @attr {boolean} no-auto
   */
  noAuto: boolean;

  /**
   * Set the withCredentials flag on the request.
   * @attr {boolean} with-credentials
   */
  withCredentials: boolean;

  /**
   * Pass-through to input's capture attribute. Allows user to trigger device inputs
   * such as camera or microphone immediately.
   */
  capture: string | null | undefined;

  /**
   * Specifies the upload format to use when sending files to the server.
   * - 'raw': Send file as raw binary data with the file's MIME type as Content-Type (default)
   * - 'multipart': Send file using multipart/form-data encoding
   * @attr {string} upload-format
   */
  uploadFormat: UploadFormat;

  /**
   * Specifies the maximum number of files that can be uploaded simultaneously.
   * This helps prevent browser performance degradation and XHR limitations when
   * uploading large numbers of files. Files exceeding this limit will be queued
   * and uploaded as active uploads complete.
   * @attr {number} max-concurrent-uploads
   * @default 3
   */
  maxConcurrentUploads: number;

  /**
   * The object used to localize this component. To change the default
   * localization, replace this with an object that provides all properties, or
   * just the individual properties you want to change.
   *
   * The object has the following JSON structure and default values:
   *
   * ```js
   * {
   *   dropFiles: {
   *     one: 'Drop file here',
   *     many: 'Drop files here'
   *   },
   *   addFiles: {
   *     one: 'Upload File...',
   *     many: 'Upload Files...'
   *   },
   *   error: {
   *     tooManyFiles: 'Too Many Files.',
   *     fileIsTooBig: 'File is Too Big.',
   *     incorrectFileType: 'Incorrect File Type.'
   *   },
   *   uploading: {
   *     status: {
   *       connecting: 'Connecting...',
   *       stalled: 'Stalled',
   *       processing: 'Processing File...',
   *       held: 'Queued'
   *     },
   *     remainingTime: {
   *       prefix: 'remaining time: ',
   *       unknown: 'unknown remaining time'
   *     },
   *     error: {
   *       serverUnavailable: 'Upload failed, please try again later',
   *       unexpectedServerError: 'Upload failed due to server error',
   *       forbidden: 'Upload forbidden'
   *     }
   *   },
   *   file: {
   *     retry: 'Retry',
   *     start: 'Start',
   *     remove: 'Remove'
   *   },
   *   units: {
   *     size: ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'],
   *     sizeBase: 1000
   *   },
   *   formatSize: function(bytes) {
   *     // returns the size followed by the best suitable unit
   *   },
   *   formatTime: function(seconds, [secs, mins, hours]) {
   *     // returns a 'HH:MM:SS' string
   *   }
   * }
   * ```
   *
   * @default {English}
   */
  i18n: UploadI18n;

  /**
   * Triggers the upload of any files that are not completed
   *
   * @param files Files being uploaded. Defaults to all outstanding files
   */
  uploadFiles(files?: UploadFile | UploadFile[]): void;
}