import rollup from 'rollup';
import fs from 'fs-extra';
import globby from 'globby';

interface Target extends globby.GlobbyOptions {
  /**
   * Path or glob of what to copy.
   */
  readonly src: string | readonly string[];

  /**
   * One or more destinations where to copy.
   * Should set "dest" or "file" param.
   */
  readonly dest?: string | readonly string[];

  /**
   * Destination file.
   * If this param is set, the "dest", "rename" and "flatten" params will be ignored.
   */
  readonly file?: string;

  /**
   * Change destination file or folder name.
   */
  readonly rename?: string | ((name: string, extension: string, fullPath: string) => string);

  /**
   * Modify file contents.
   */
  readonly transform?: (contents: Buffer, name: string) => any;
}

interface CopyOptions extends globby.GlobbyOptions, fs.CopyOptions {
  /**
   * Copy items once. Useful in watch mode.
   * @default false
   */
  readonly copyOnce?: boolean;

  /**
   * Remove the directory structure of copied files.
   * @default true
   */
  readonly flatten?: boolean;

  /**
   * Rollup hook the plugin should use.
   * @default 'buildEnd'
   */
  readonly hook?: string;

  /**
   * Array of targets to copy.
   * @default []
   */
  readonly targets?: readonly Target[];

  /**
   * Output copied items to console.
   * @default false
   */
  readonly verbose?: boolean;
}

/**
 * Copy files and folders using Rollup
 */
export default function copyMerge(options?: CopyOptions): rollup.Plugin;