/*
 Copyright (C) 2024 3NSoft Inc.

 This program is free software: you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation, either version 3 of the License, or (at your option) any later
 version.

 This program is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 this program. If not, see <http://www.gnu.org/licenses/>.
*/

import { areAddressesEqual } from './address-utils.ts';
import { filter, streamFrom } from './stream-utils.ts';

type IncomingMessage = web3n.asmail.IncomingMessage;
type OutgoingMessage = web3n.asmail.OutgoingMessage;
type DeliveryProgress = web3n.asmail.DeliveryProgress;

export type MsgType = 'chat';

export function watchIncomingMsgs(
  msgType: MsgType,
): ReadableStream<IncomingMessage> {
  return streamFrom<IncomingMessage>(
    obs => w3n.mail!.inbox.subscribe('message', obs),
  ).pipeThrough(filter(m => (m.msgType === msgType)));
}

export async function sendMsg(
  msg: OutgoingMessage,
  progress?: (p: DeliveryProgress) => void,
) {
  if (!msg.recipients || (msg.recipients.length === 0)) {
    throw new Error(`No recipients given in the message`);
  }
  const recipients = msg.recipients.concat();
  msg.carbonCopy?.forEach(addr => {
    if (!recipients.find(a => areAddressesEqual(a, addr))) {
      recipients.push(addr);
    }
  });
  const deliveryId = `#${Date.now()}-${Math.floor(Number.MAX_SAFE_INTEGER * Math.random())}`;
  await w3n.mail!.delivery.addMsg(recipients, msg, deliveryId);
  try {
    await new Promise<void>((resolve, reject) => {
      let isDone = false;
      w3n.mail!.delivery.observeDelivery(deliveryId, {
        next: p => {
          if (isDone) {
            return;
          }
          try {
            progress?.(p);
          } catch (err) {
            console.error(err);
          }
          if (p.allDone) {
            isDone = true;
            if (p.allDone === 'all-ok') {
              resolve();
            } else if (p.allDone === 'with-errors') {
              reject(p);
            }
          }
        },
        complete: () => {
          if (!isDone) {
            isDone = true;
            resolve();
          }
        },
        error: err => {
          if (!isDone) {
            isDone = true;
            reject(err);
          }
        },
      });
    });
  } finally {
    w3n.mail!.delivery.rmMsg(deliveryId).catch(err => console.error(err));
  }
}
