import _ from 'lodash';
import { ClosedGroup, getMessageQueue } from '..';
import { ConversationTypeEnum } from '../../models/conversationAttributes';
import { MessageModel } from '../../models/message';
import { addKeyPairToCacheAndDBIfNeeded } from '../../receiver/closedGroups';
import { ECKeyPair } from '../../receiver/keypairs';
import { openConversationWithMessages } from '../../state/ducks/conversations';
import { updateConfirmModal } from '../../state/ducks/modalDialog';
import { getSwarmPollingInstance } from '../apis/snode_api';
import {
  generateClosedGroupPublicKey,
  generateCurve25519KeyPairWithoutPrefix,
  generateGroupV3Keypair,
} from '../crypto';
import {
  ClosedGroupNewMessage,
  ClosedGroupNewMessageParams,
} from '../messages/outgoing/controlMessage/group/ClosedGroupNewMessage';
import { PubKey } from '../types';
import { UserUtils } from '../utils';
import { forceSyncConfigurationNowIfNeeded } from '../utils/syncUtils';
import { getConversationController } from './ConversationController';

export async function createClosedGroup(groupName: string, members: Array<string>, isV3: boolean) {
  const setOfMembers = new Set(members);

  const us = UserUtils.getOurPubKeyStrFromCache();

  const identityKeyPair = await generateGroupV3Keypair();
  if (!identityKeyPair) {
    throw new Error('Could not create identity keypair for new closed group v3');
  }

  // a v3 pubkey starts with 03 and an old one starts with 05
  const groupPublicKey = isV3 ? identityKeyPair.pubkey : await generateClosedGroupPublicKey();

  // the first encryption keypair is generated the same for all versions of closed group
  const encryptionKeyPair = await generateCurve25519KeyPairWithoutPrefix();
  if (!encryptionKeyPair) {
    throw new Error('Could not create encryption keypair for new closed group');
  }

  // Create the group
  const convo = await getConversationController().getOrCreateAndWait(
    groupPublicKey,
    isV3 ? ConversationTypeEnum.GROUPV3 : ConversationTypeEnum.GROUP
  );
  await convo.setIsApproved(true, false);

  // Ensure the current user is a member
  setOfMembers.add(us);
  const listOfMembers = [...setOfMembers];
  const admins = [us];
  const existingExpireTimer = 0;

  const groupDetails: ClosedGroup.GroupInfo = {
    id: groupPublicKey,
    name: groupName,
    members: listOfMembers,
    admins,
    activeAt: Date.now(),
    expireTimer: existingExpireTimer,
  };

  const groupDetailsV3: ClosedGroup.GroupInfoV3 = {
    id: groupPublicKey,
    identityPrivateKey: isV3 ? identityKeyPair.privateKey : undefined,
    isV3: true,
    name: groupName,
    members: listOfMembers,
    admins,
    activeAt: Date.now(),
    expireTimer: existingExpireTimer,
  };

  // used for UI only, adding of a message to remind who is in the group and the name of the group
  const groupDiff: ClosedGroup.GroupDiff = {
    newName: groupName,
    joiningMembers: listOfMembers,
  };

  const dbMessage = await ClosedGroup.addUpdateMessage(convo, groupDiff, us, Date.now());
  // be sure to call this before sending the message.
  // the sending pipeline needs to know from GroupUtils when a message is for a medium group
  await ClosedGroup.updateOrCreateClosedGroup(isV3 ? groupDetailsV3 : groupDetails);
  await convo.commit();
  convo.updateLastMessage();

  if (isV3) {
    // we need to send a group info and encryption keys message to the batch endpoint with both seqno being 0
    throw new Error('fixme');
  }

  // Send a closed group update message to all members individually
  const allInvitesSent = await sendToGroupMembers(
    listOfMembers,
    groupPublicKey,
    groupName,
    admins,
    encryptionKeyPair,
    dbMessage,
    existingExpireTimer
  );

  if (allInvitesSent) {
    const newHexKeypair = encryptionKeyPair.toHexKeyPair();

    const isHexKeyPairSaved = await addKeyPairToCacheAndDBIfNeeded(groupPublicKey, newHexKeypair);

    if (isHexKeyPairSaved) {
      window?.log?.info('Dropping already saved keypair for group', groupPublicKey);
    }

    // Subscribe to this group id
    getSwarmPollingInstance().addGroupId(new PubKey(groupPublicKey));
  }

  await forceSyncConfigurationNowIfNeeded();

  await openConversationWithMessages({ conversationKey: groupPublicKey, messageId: null });
}

/**
 * Sends a group invite message to each member of the group.
 * @returns Array of promises for group invite messages sent to group members.
 * This function takes care of the groupv3 specificities
 */
async function sendToGroupMembers(
  listOfMembers: Array<string>,
  groupPublicKey: string,
  groupName: string,
  admins: Array<string>,
  encryptionKeyPair: ECKeyPair,
  dbMessage: MessageModel,
  existingExpireTimer: number,
  isRetry: boolean = false
): Promise<any> {
  const promises = createInvitePromises(
    listOfMembers,
    groupPublicKey,
    groupName,
    admins,
    encryptionKeyPair,
    dbMessage,
    existingExpireTimer
  );
  window?.log?.info(`Sending invites for group ${groupPublicKey} to ${listOfMembers}`);
  // evaluating if all invites sent, if failed give the option to retry failed invites via modal dialog
  const inviteResults = await Promise.all(promises);
  const allInvitesSent = _.every(inviteResults, inviteResult => inviteResult !== false);

  if (allInvitesSent) {
    // if (true) {
    if (isRetry) {
      const invitesTitle =
        inviteResults.length > 1
          ? window.i18n('closedGroupInviteSuccessTitlePlural')
          : window.i18n('closedGroupInviteSuccessTitle');

      window.inboxStore?.dispatch(
        updateConfirmModal({
          title: invitesTitle,
          message: window.i18n('closedGroupInviteSuccessMessage'),
          hideCancel: true,
        })
      );
    }
    return allInvitesSent;
  } else {
    // Confirmation dialog that recursively calls sendToGroupMembers on resolve

    window.inboxStore?.dispatch(
      updateConfirmModal({
        title:
          inviteResults.length > 1
            ? window.i18n('closedGroupInviteFailTitlePlural')
            : window.i18n('closedGroupInviteFailTitle'),
        message:
          inviteResults.length > 1
            ? window.i18n('closedGroupInviteFailMessagePlural')
            : window.i18n('closedGroupInviteFailMessage'),
        okText: window.i18n('closedGroupInviteOkText'),
        onClickOk: async () => {
          const membersToResend: Array<string> = new Array<string>();
          inviteResults.forEach((result, index) => {
            const member = listOfMembers[index];
            // group invite must always contain the admin member.
            if (result !== true || admins.includes(member)) {
              membersToResend.push(member);
            }
          });
          if (membersToResend.length > 0) {
            const isRetrySend = true;
            await sendToGroupMembers(
              membersToResend,
              groupPublicKey,
              groupName,
              admins,
              encryptionKeyPair,
              dbMessage,
              existingExpireTimer,
              isRetrySend
            );
          }
        },
      })
    );
  }
  return allInvitesSent;
}

function createInvitePromises(
  listOfMembers: Array<string>,
  groupPublicKey: string,
  groupName: string,
  admins: Array<string>,
  encryptionKeyPair: ECKeyPair,
  dbMessage: MessageModel,
  existingExpireTimer: number
) {
  return listOfMembers.map(async m => {
    const messageParams: ClosedGroupNewMessageParams = {
      groupId: groupPublicKey,
      name: groupName,
      members: listOfMembers,
      admins,
      keypair: encryptionKeyPair,
      timestamp: Date.now(),
      identifier: dbMessage.id,
      expireTimer: existingExpireTimer,
    };
    const message = new ClosedGroupNewMessage(messageParams);
    return getMessageQueue().sendToPubKeyNonDurably(PubKey.cast(m), message);
  });
}