"use client";

/**
 * Content handed over by the share chooser: a small sessionStorage payload
 * the wizards pick up on mount. Files are rebuilt from base64 into real File
 * objects so the normal intake (validation, compression, parsing) runs.
 */

export type PendingShareFile = { name: string; type: string; data: string };

const KEY = "freezmo.share.pending.v1";

export function setPendingShare(payload: { text?: string; files?: PendingShareFile[] }): void {
  try {
    window.sessionStorage.setItem(KEY, JSON.stringify(payload));
  } catch {
    /* private mode */
  }
}

function base64ToBytes(base64: string): Uint8Array {
  const binary = atob(base64);
  const bytes = new Uint8Array(binary.length);
  for (let index = 0; index < binary.length; index++) bytes[index] = binary.charCodeAt(index);
  return bytes;
}

/** Reads and clears the pending share; returns real File objects. */
export function takePendingShare(): { text: string; files: File[] } | null {
  try {
    const raw = window.sessionStorage.getItem(KEY);
    if (!raw) return null;
    window.sessionStorage.removeItem(KEY);
    const parsed = JSON.parse(raw) as { text?: string; files?: PendingShareFile[] };
    const files = (parsed.files ?? []).map(
      (file) => new File([base64ToBytes(file.data) as unknown as BlobPart], file.name, { type: file.type }),
    );
    return { text: parsed.text ?? "", files };
  } catch {
    return null;
  }
}