/**
 * WebView Utility Actions
 *
 * Helper module for sending utility actions to Flutter via HabibApp channel.
 * Actions: download_file, copy_to_clipboard, open_external_url, upload_file, buy_coin
 *
 * Docs: WEBVIEW_ACTION_DOWNLOAD.md
 */

// ─── Helpers ─────────────────────────────────────────────

/** Check if running inside Flutter WebView (HabibApp channel available). */
export function isInFlutterWebView(): boolean {
  return typeof window !== "undefined" && !!window.HabibApp?.postMessage;
}

/**
 * Low-level: send a JSON message to Flutter via HabibApp.postMessage.
 * Returns `true` if the message was dispatched, `false` if channel unavailable.
 */
export function postActionToFlutter(
  action: string,
  data?: Record<string, unknown>,
): boolean {
  if (!isInFlutterWebView()) return false;

  const message = data !== undefined ? { action, data } : { action };
  window.HabibApp!.postMessage(JSON.stringify(message));
  return true;
}

// ─── download_file ───────────────────────────────────────

export interface DownloadFileOptions {
  url: string;
  fileName?: string;
  title?: string;
  mimeType?: string;
  fileType?: "image" | "video" | "audio" | "document" | "archive" | "other";
  size?: number;
  metadata?: Record<string, unknown>;
}

/**
 * Ask Flutter to download a file natively.
 *
 * ```ts
 * downloadFile({ url: 'https://…/doc.pdf', fileName: 'doc.pdf', mimeType: 'application/pdf', fileType: 'document' });
 * ```
 */
export function downloadFile(options: DownloadFileOptions): boolean {
  return postActionToFlutter(
    "download_file",
    options as unknown as Record<string, unknown>,
  );
}

// ─── copy_to_clipboard ──────────────────────────────────

export interface CopyToClipboardOptions {
  text: string;
  label?: string;
  showToast?: boolean;
}

/**
 * Copy text to the device clipboard via Flutter.
 * Falls back to `navigator.clipboard.writeText` if not in WebView.
 */
export async function copyToClipboard(
  text: string,
  label?: string,
): Promise<boolean> {
  if (isInFlutterWebView()) {
    return postActionToFlutter("copy_to_clipboard", {
      text,
      label,
      showToast: true,
    });
  }

  // Fallback for normal browser
  try {
    await navigator.clipboard.writeText(text);
    return true;
  } catch {
    return false;
  }
}

// ─── open_external_url ──────────────────────────────────

export interface OpenExternalUrlOptions {
  url: string;
  mode?: "externalApplication" | "platformDefault";
  title?: string;
  showErrorToast?: boolean;
}

/**
 * Ask Flutter to open a URL in the external browser / app.
 *
 * ```ts
 * openExternalUrl({ url: 'https://habibapp.com' });
 * ```
 */
export function openExternalUrl(options: OpenExternalUrlOptions): boolean {
  return postActionToFlutter("open_external_url", {
    mode: "externalApplication",
    showErrorToast: true,
    ...options,
  } as Record<string, unknown>);
}

// ─── upload_file ─────────────────────────────────────────

export interface UploadFileOptions {
  mediaType: "image" | "video" | "image+video" | "audio" | "file";
  source?: "gallery" | "camera" | "any";
  multiple?: boolean;
  returnAs?: "upload" | "base64";
  uploadUrl?: string;
  fieldName?: string;
  uploadMethod?: string;
  headers?: Record<string, string>;
  maxBytes?: number;
  allowedExtensions?: string[];
  maxWidth?: number;
  maxHeight?: number;
  imageQuality?: number;
  title?: string;
}

/**
 * Ask Flutter to pick (and optionally upload) a file from the device.
 *
 * ```ts
 * uploadFile({
 *   mediaType: 'image',
 *   source: 'gallery',
 *   returnAs: 'upload',
 *   uploadUrl: '/hussainya/dashboard/upload-media/',
 *   maxBytes: 5_242_880,
 * });
 * ```
 */
export function uploadFile(options: UploadFileOptions): boolean {
  return postActionToFlutter(
    "upload_file",
    options as unknown as Record<string, unknown>,
  );
}

// ─── buy_coin ────────────────────────────────────────────

/**
 * Ask Flutter to open the Habib Coin packages list page (Add Coin).
 *
 * Used when a payment fails with "Not enough coins": the user tops up
 * natively, returns to the WebView and retries the payment.
 *
 * ```ts
 * buyHabibCoinPackages();
 * ```
 */
export function buyHabibCoinPackages(): boolean {
  return postActionToFlutter("buy_coin");
}