export interface Folder {
  id: number;
  name: string;
  system: boolean;
  messageCount: number;
  unreadCount: number;
}

export interface Message {
  id: number;
  folderId: number;
  senderEmail: string;
  senderName?: string | null;
  recipientEmail: string;
  ccEmail?: string | null;
  subject: string;
  body: string;
  html: boolean;
  read: boolean;
  flagged: boolean;
  spam: boolean;
  messageSize?: number | null;
  receivedAt: string;
  hasAttachments: boolean;
  attachmentCount: number;
  answeredBy?: string | null;   // login that answered it from the web client (shared mailboxes)
}

/** MailboxAccess.Entry — a mailbox of the logged-in user (left menu) */
export interface MailboxEntry {
  email: string;
  displayName: string;
  kind: 'OWN' | 'MEMBER' | 'ATTACHED';
  shared: boolean;
  unread: number;
}

export interface Attachment {
  id: number;
  filename: string;
  contentType: string;
  sizeBytes: number;
}

export interface Contact {
  id?: number;
  name: string;
  email: string;
  phone?: string;
  company?: string;
}

export interface BlacklistEntry {
  id: number;
  senderEmail: string;
  reason?: string | null;
  createdAt?: string;
}

export interface Profile {
  email: string;
  displayName: string;
  usedBytes: number;
  quotaBytes: number;
  createdAt: string;
  admin?: boolean;        // may manage mailboxes (Settings → Mailboxes)
}

/** MailboxAdminController.MailboxView */
export interface Mailbox {
  id: number;
  email: string;
  displayName: string;
  active: boolean;
  admin: boolean;
  trap: boolean;          // what it sends to outside addresses stays in its own INBOX (staging@)
  shared: boolean;        // shared mailbox: no login of its own, members open it
  members: string[];      // who may open it
  usedBytes: number;
  quotaBytes: number;
  createdAt: string;
}

/** MailLists.MailList — mail to the address → a copy to every member, into the folder (null — INBOX) */
export interface MailList {
  id: number;
  address: string;
  folder: string | null;
  description: string | null;
  openToOutside: boolean;
  members: string[];
}

/** password — generated by the server, shown once; null when the administrator chose it */
export interface MailboxCreated {
  mailbox: Mailbox;
  password: string | null;
}

export interface ServerConfig {
  registrationEnabled: boolean;
  domains: string[];
}

export interface Draft {
  to: string;
  cc: string;
  subject: string;
  body: string;
  html: boolean;
}

/** System folders: label and icon in the web client. */
export const FOLDER_VIEW: Record<string, { label: string; icon: string }> = {
  INBOX: { label: 'Inbox', icon: 'inbox' },
  Drafts: { label: 'Drafts', icon: 'edit_note' },
  Sent: { label: 'Sent', icon: 'send' },
  Spam: { label: 'Spam', icon: 'report' },
  Trash: { label: 'Trash', icon: 'delete' }
};

export function folderLabel(folder: Folder): string {
  return folder.system ? (FOLDER_VIEW[folder.name]?.label ?? folder.name) : folder.name;
}

export function folderIcon(folder: Folder): string {
  return folder.system ? (FOLDER_VIEW[folder.name]?.icon ?? 'folder') : 'folder';
}

export function formatBytes(bytes: number | null | undefined): string {
  const value = bytes ?? 0;
  if (value < 1024) return `${value} B`;
  if (value < 1024 * 1024) return `${(value / 1024).toFixed(1)} KB`;
  if (value < 1024 * 1024 * 1024) return `${(value / 1024 / 1024).toFixed(1)} MB`;
  return `${(value / 1024 / 1024 / 1024).toFixed(2)} GB`;
}

/** Text of an API error: our {error}, Spring's {message}, or the status. */
export function errorText(error: unknown): string {
  const e = error as { error?: { error?: string; message?: string; status?: number } | string; status?: number; message?: string };
  if (e?.error && typeof e.error === 'object') {
    // Spring's error body: {status, error: "Bad Request", message: "No such mailbox: …"} — the reason is in message
    const body = e.error;
    const springBody = typeof body.status === 'number';
    return (springBody ? body.message || body.error : body.error || body.message) || `Error ${e.status ?? ''}`.trim();
  }
  if (typeof e?.error === 'string' && e.error) return e.error;
  if (e?.status === 0) return 'Server is not reachable';
  return e?.message || 'Something went wrong';
}