import { Data } from '../../data/data';
import { ConversationCollection, ConversationModel } from '../../models/conversation';
import { BlockedNumberController } from '../../util';
import { getSwarmFor } from '../apis/snode_api/snodePool';
import { PubKey } from '../types';
import { actions as conversationActions } from '../../state/ducks/conversations';
import { OpenGroupData } from '../../data/opengroups';
import _ from 'lodash';
import { getOpenGroupManager } from '../apis/open_group_api/opengroupV2/OpenGroupManagerV2';

import { deleteAllMessagesByConvoIdNoConfirmation } from '../../interactions/conversationInteractions';
import { ConversationTypeEnum } from '../../models/conversationAttributes';

let instance: ConversationController | null;

export const getConversationController = () => {
  if (instance) {
    return instance;
  }
  instance = new ConversationController();

  return instance;
};

export class ConversationController {
  private readonly conversations: ConversationCollection;
  private _initialFetchComplete: boolean = false;
  private _initialPromise?: Promise<any>;

  /**
   * Do not call this constructor. You get the ConversationController through getConversationController() only
   */
  constructor() {
    this.conversations = new ConversationCollection();
  }

  // FIXME this could return | undefined
  public get(id: string): ConversationModel {
    if (!this._initialFetchComplete) {
      throw new Error('getConversationController().get() needs complete initial fetch');
    }

    return this.conversations.get(id);
  }

  public getOrThrow(id: string): ConversationModel {
    if (!this._initialFetchComplete) {
      throw new Error('getConversationController().get() needs complete initial fetch');
    }

    const convo = this.conversations.get(id);

    if (convo) {
      return convo;
    }
    throw new Error(`Conversation ${id} does not exist on getConversationController().get()`);
  }
  // Needed for some model setup which happens during the initial fetch() call below
  public getUnsafe(id: string): ConversationModel | undefined {
    return this.conversations.get(id);
  }

  public getOrCreate(id: string, type: ConversationTypeEnum) {
    if (typeof id !== 'string') {
      throw new TypeError("'id' must be a string");
    }

    if (
      type !== ConversationTypeEnum.PRIVATE &&
      type !== ConversationTypeEnum.GROUP &&
      type !== ConversationTypeEnum.GROUPV3
    ) {
      throw new TypeError(`'type' must be 'private' or 'group' or 'groupv3' but got: '${type}'`);
    }

    if (!this._initialFetchComplete) {
      throw new Error('getConversationController().get() needs complete initial fetch');
    }

    let conversation = this.conversations.get(id);
    if (conversation) {
      return conversation;
    }

    conversation = this.conversations.add({
      id,
      type,
    });

    const create = async () => {
      try {
        await Data.saveConversation(conversation.attributes);
      } catch (error) {
        window?.log?.error(
          'Conversation save failed! ',
          id,
          type,
          'Error:',
          error && error.stack ? error.stack : error
        );
        throw error;
      }

      return conversation;
    };

    conversation.initialPromise = create();
    conversation.initialPromise.then(() => {
      if (window?.inboxStore) {
        window.inboxStore?.dispatch(
          conversationActions.conversationAdded({
            id: conversation.id,
            data: conversation.getConversationModelProps(),
          })
        );
      }
      if (!conversation.isPublic() && conversation.isActive()) {
        // NOTE: we request snodes updating the cache, but ignore the result

        void getSwarmFor(id);
      }
    });

    return conversation;
  }

  public getContactProfileNameOrShortenedPubKey(pubKey: string): string {
    const conversation = getConversationController().get(pubKey);
    if (!conversation) {
      return pubKey;
    }
    return conversation.getContactProfileNameOrShortenedPubKey();
  }

  public isMediumGroup(hexEncodedGroupPublicKey: string): boolean {
    const convo = this.conversations.get(hexEncodedGroupPublicKey);
    if (convo) {
      return !!convo.isMediumGroup();
    }
    return false;
  }

  public async getOrCreateAndWait(
    id: string | PubKey,
    type: ConversationTypeEnum
  ): Promise<ConversationModel> {
    const initialPromise =
      this._initialPromise !== undefined ? this._initialPromise : Promise.resolve();
    return initialPromise.then(() => {
      if (!id) {
        return Promise.reject(new Error('getOrCreateAndWait: invalid id passed.'));
      }
      const pubkey = id && (id as any).key ? (id as any).key : id;
      const conversation = this.getOrCreate(pubkey, type);

      if (conversation) {
        return conversation.initialPromise.then(() => conversation);
      }

      return Promise.reject(new Error('getOrCreateAndWait: did not get conversation'));
    });
  }

  /**
   * Usually, we want to mark private contact deleted as inactive (active_at = undefined).
   * That way we can still have the username and avatar for them, but they won't appear in search results etc.
   * For the blinded contact deletion though, we want to delete it completely because we merged it to an unblinded convo.
   */
  public async deleteBlindedContact(blindedId: string) {
    if (!this._initialFetchComplete) {
      throw new Error(
        'getConversationController().deleteBlindedContact() needs complete initial fetch'
      );
    }
    if (!PubKey.hasBlindedPrefix(blindedId)) {
      throw new Error('deleteBlindedContact allow accepts blinded id');
    }
    window.log.info(`deleteBlindedContact with ${blindedId}`);
    const conversation = this.conversations.get(blindedId);
    if (!conversation) {
      window.log.warn(`deleteBlindedContact no such convo ${blindedId}`);
      return;
    }

    // we remove the messages left in this convo. The caller has to merge them if needed
    await deleteAllMessagesByConvoIdNoConfirmation(conversation.id);

    conversation.set({ didApproveMe: false, isApproved: false });
    await conversation.commit();
  }

  public async deleteContact(id: string) {
    if (!this._initialFetchComplete) {
      throw new Error('getConversationController().deleteContact() needs complete initial fetch');
    }

    window.log.info(`deleteContact with ${id}`);

    const conversation = this.conversations.get(id);
    if (!conversation) {
      window.log.warn(`deleteContact no such convo ${id}`);
      return;
    }

    // Closed/Medium group leaving
    if (conversation.isClosedGroup()) {
      window.log.info(`deleteContact ClosedGroup case: ${id}`);
      await conversation.leaveClosedGroup();
      // open group v2
    } else if (conversation.isOpenGroupV2()) {
      window?.log?.info('leaving open group v2', conversation.id);
      const roomInfos = OpenGroupData.getV2OpenGroupRoom(conversation.id);
      if (roomInfos) {
        getOpenGroupManager().removeRoomFromPolledRooms(roomInfos);

        // remove the roomInfos locally for this open group room
        try {
          await OpenGroupData.removeV2OpenGroupRoom(conversation.id);
        } catch (e) {
          window?.log?.info('removeV2OpenGroupRoom failed:', e);
        }
      }
    }

    // those are the stuff to do for all contact types
    window.log.info(`deleteContact destroyingMessages: ${id}`);

    await deleteAllMessagesByConvoIdNoConfirmation(conversation.id);
    window.log.info(`deleteContact message destroyed: ${id}`);
    // if this conversation is a private conversation it's in fact a `contact` for desktop.
    // we just want to remove everything related to it, set the active_at to undefined
    // so conversation still exists (useful for medium groups members or opengroups) but is not shown on the UI
    if (conversation.isPrivate()) {
      window.log.info(`deleteContact isPrivate, marking as inactive: ${id}`);

      conversation.set({
        active_at: undefined,
        isApproved: false,
      });
      await conversation.commit();
    } else {
      window.log.info(`deleteContact !isPrivate, removing convo from DB: ${id}`);

      await Data.removeConversation(id);
      window.log.info(`deleteContact !isPrivate, convo removed from DB: ${id}`);

      this.conversations.remove(conversation);
      if (window?.inboxStore) {
        window.inboxStore?.dispatch(
          conversationActions.conversationChanged({
            id: conversation.id,
            data: conversation.getConversationModelProps(),
          })
        );
        window.inboxStore?.dispatch(conversationActions.conversationRemoved(conversation.id));
      }
      window.log.info(`deleteContact !isPrivate, convo removed from store: ${id}`);
    }
  }

  public getConversations(): Array<ConversationModel> {
    return Array.from(this.conversations.models);
  }

  public unsafeDelete(convo: ConversationModel) {
    this.conversations.remove(convo);
  }

  public async load() {
    if (this.conversations.length) {
      throw new Error('ConversationController: Already loaded!');
    }

    const load = async () => {
      try {
        const start = Date.now();
        const collection = await Data.getAllConversations();

        this.conversations.add(collection.models);

        this._initialFetchComplete = true;
        const promises: any = [];
        this.conversations.forEach((conversation: ConversationModel) => {
          if (!conversation.get('lastMessage')) {
            // tslint:disable-next-line: no-void-expression
            promises.push(conversation.updateLastMessage());
          }
        });

        await Promise.all(promises);
        window?.log?.info(
          `ConversationController: done with initial fetch in ${Date.now() - start}ms.`
        );
      } catch (error) {
        window?.log?.error(
          'ConversationController: initial fetch failed',
          error && error.stack ? error.stack : error
        );
        throw error;
      }
    };
    await BlockedNumberController.load();

    this._initialPromise = load();

    return this._initialPromise;
  }

  public loadPromise() {
    return this._initialPromise;
  }
  public reset() {
    this._initialPromise = Promise.resolve();
    this._initialFetchComplete = false;
    if (window?.inboxStore) {
      window.inboxStore?.dispatch(conversationActions.removeAllConversations());
    }
    this.conversations.reset([]);
  }
}