import Store from '~/sidebar/stores/sidebar_store';
import createFlash from '~/flash';
import { __, sprintf } from '~/locale';
import toast from '~/vue_shared/plugins/global_toast';
import { refreshUserMergeRequestCounts } from '~/commons/nav/user_merge_requests';
import { visitUrl } from '../lib/utils/url_utility';
import Service from './services/sidebar_service';

export default class SidebarMediator {
  constructor(options) {
    if (!SidebarMediator.singleton) {
      this.initSingleton(options);
    }
    return SidebarMediator.singleton;
  }

  initSingleton(options) {
    this.store = new Store(options);
    this.service = new Service({
      endpoint: options.endpoint,
      moveIssueEndpoint: options.moveIssueEndpoint,
      projectsAutocompleteEndpoint: options.projectsAutocompleteEndpoint,
      fullPath: options.fullPath,
      iid: options.iid,
      issuableType: options.issuableType,
    });
    SidebarMediator.singleton = this;
  }

  assignYourself() {
    this.store.addAssignee(this.store.currentUser);
  }

  async saveAssignees(field) {
    const selected = this.store.assignees.map((u) => u.id);

    // If there are no ids, that means we have to unassign (which is id = 0)
    // And it only accepts an array, hence [0]
    const assignees = selected.length === 0 ? [0] : selected;
    const data = { assignee_ids: assignees };

    try {
      const { currentUserHasAttention } = this.store;
      const res = await this.service.update(field, data);

      this.store.overwrite('assignees', res.data.assignees);

      if (res.data.reviewers) {
        this.store.overwrite('reviewers', res.data.reviewers);
      }

      if (currentUserHasAttention && this.store.isAddingAssignee) {
        toast(__('Assigned user(s). Your attention request was removed.'));
      }

      return Promise.resolve(res);
    } catch (e) {
      return Promise.reject(e);
    }
  }

  async saveReviewers(field) {
    const selected = this.store.reviewers.map((u) => u.id);

    // If there are no ids, that means we have to unassign (which is id = 0)
    // And it only accepts an array, hence [0]
    const reviewers = selected.length === 0 ? [0] : selected;
    const data = { reviewer_ids: reviewers };

    try {
      const { currentUserHasAttention } = this.store;
      const res = await this.service.update(field, data);

      this.store.overwrite('reviewers', res.data.reviewers);
      this.store.overwrite('assignees', res.data.assignees);

      if (currentUserHasAttention && this.store.isAddingAssignee) {
        toast(__('Requested review. Your attention request was removed.'));
      }

      return Promise.resolve(res);
    } catch (e) {
      return Promise.reject();
    }
  }

  requestReview({ userId, callback }) {
    return this.service
      .requestReview(userId)
      .then(() => {
        this.store.updateReviewer(userId, 'reviewed');
        toast(__('Requested review'));
        callback(userId, true);
      })
      .catch(() => callback(userId, false));
  }

  removeCurrentUserAttentionRequested() {
    const currentUserId = gon.current_user_id;

    const currentUserReviewer = this.store.findReviewer({ id: currentUserId });
    const currentUserAssignee = this.store.findAssignee({ id: currentUserId });

    if (currentUserReviewer?.attention_requested || currentUserAssignee?.attention_requested) {
      // Update current users attention_requested state
      this.store.updateReviewer(currentUserId, 'attention_requested');
      this.store.updateAssignee(currentUserId, 'attention_requested');
    }
  }

  async toggleAttentionRequested(type, { user, callback, direction }) {
    const mutations = {
      add: (id) => this.service.requestAttention(id),
      remove: (id) => this.service.removeAttentionRequest(id),
    };

    try {
      const isReviewer = type === 'reviewer';
      const reviewerOrAssignee = isReviewer
        ? this.store.findReviewer(user)
        : this.store.findAssignee(user);

      await mutations[direction]?.(user.id);

      if (reviewerOrAssignee.attention_requested) {
        toast(
          sprintf(__('Removed attention request from @%{username}'), {
            username: user.username,
          }),
        );
      } else {
        const currentUserId = gon.current_user_id;
        const { currentUserHasAttention } = this.store;

        if (currentUserId !== user.id) {
          this.removeCurrentUserAttentionRequested();
        }

        toast(
          currentUserHasAttention && currentUserId !== user.id
            ? sprintf(
                __(
                  'Requested attention from @%{username}. Your own attention request was removed.',
                ),
                { username: user.username },
              )
            : sprintf(__('Requested attention from @%{username}'), { username: user.username }),
        );
      }

      this.store.updateReviewer(user.id, 'attention_requested');
      this.store.updateAssignee(user.id, 'attention_requested');

      refreshUserMergeRequestCounts();
      callback();
    } catch (error) {
      callback();
      createFlash({
        message: sprintf(__('Updating the attention request for %{username} failed.'), {
          username: user.username,
        }),
        error,
        captureError: true,
        actionConfig: {
          title: __('Try again'),
          clickHandler: () => this.toggleAttentionRequired(type, { user, callback, direction }),
        },
      });
    }
  }

  setMoveToProjectId(projectId) {
    this.store.setMoveToProjectId(projectId);
  }

  fetch() {
    return this.service
      .get()
      .then(([restResponse, graphQlResponse]) => {
        this.processFetchedData(restResponse.data, graphQlResponse.data);
      })
      .catch(() =>
        createFlash({
          message: __('Error occurred when fetching sidebar data'),
        }),
      );
  }

  processFetchedData(data) {
    this.store.setAssigneeData(data);
    this.store.setReviewerData(data);
    this.store.setTimeTrackingData(data);
  }

  fetchAutocompleteProjects(searchTerm) {
    return this.service.getProjectsAutocomplete(searchTerm).then(({ data }) => {
      this.store.setAutocompleteProjects(data);
      return this.store.autocompleteProjects;
    });
  }

  moveIssue() {
    return this.service.moveIssue(this.store.moveToProjectId).then(({ data }) => {
      if (window.location.pathname !== data.web_url) {
        visitUrl(data.web_url);
      }
    });
  }
}
