// What the e-mail program's and the e-mail server's windows show, as the
// room keeps them and every client shows them (plan §7.3), after
// GUIApplicationEmailAnwendungWindow and GUIApplicationEmailServerWindow
// (measured with tools/java-oracle's MailWindowRun).

import { addressText, type EmailClientAccount, type Mail } from '@mdg-filius/core';

/** The e-mail program: its account (null before one is set) and its two folders, oldest first. */
export interface EmailClientView {
  readonly account: EmailClientAccount | null;
  readonly inbox: readonly Mail[];
  readonly sent: readonly Mail[];
}

/** The e-mail server: its button, its domain, and each account with the number of mails it holds. */
export interface EmailServerView {
  readonly active: boolean;
  readonly domain: string;
  readonly accounts: readonly { readonly username: string; readonly mails: number }[];
}

/** posteingangAktualisieren: a received mail's row — its sender's name, else its address, nothing without a sender — and its subject. */
export function inboxRow(mail: Mail): readonly [string, string] {
  const sender = mail.sender === null ? '' : (mail.sender.name ?? mail.sender.mailAddress ?? '');
  return [sender, mail.subject ?? ''];
}

/** gesendeteAktualisieren: a sent mail's row — its recipients as Email.holeEmpfaengerListe writes them — and its subject. */
export function sentRow(mail: Mail): readonly [string, string] {
  return [mail.to.map((each) => addressText(each) ?? 'null').join(', '), mail.subject ?? ''];
}

/**
 * emailVerfassen with a mail to answer: to its sender, the subject after
 * Java's "RE:", the text quoted below "<sender> wrote:" (replyLayout: each
 * line after "> ").
 */
export function replyForm(mail: Mail, words: { readonly re: string; readonly wrote: string }): { readonly to: string; readonly subject: string; readonly text: string } {
  const sender = mail.sender === null ? 'null' : (addressText(mail.sender) ?? 'null');
  return {
    to: sender,
    subject: `${words.re} ${mail.subject ?? 'null'}`,
    text: `\n\n${sender} ${words.wrote}\n> ${mail.text.replaceAll('\n', '\n> ')}`,
  };
}