import $ from 'jquery';
import axios from '~/lib/utils/axios_utils';
import Visibility from 'visibilityjs';
import Flash from '../../flash';
import Poll from '../../lib/utils/poll';
import * as types from './mutation_types';
import * as utils from './utils';
import * as constants from '../constants';
import service from '../services/notes_service';
import loadAwardsHandler from '../../awards_handler';
import sidebarTimeTrackingEventHub from '../../sidebar/event_hub';
import { isInViewport, scrollToElement } from '../../lib/utils/common_utils';

let eTagPoll;

export const expandDiscussion = ({ commit }, data) => commit(types.EXPAND_DISCUSSION, data);

export const collapseDiscussion = ({ commit }, data) => commit(types.COLLAPSE_DISCUSSION, data);

export const setNotesData = ({ commit }, data) => commit(types.SET_NOTES_DATA, data);

export const setNoteableData = ({ commit }, data) => commit(types.SET_NOTEABLE_DATA, data);

export const setUserData = ({ commit }, data) => commit(types.SET_USER_DATA, data);

export const setLastFetchedAt = ({ commit }, data) => commit(types.SET_LAST_FETCHED_AT, data);

export const setInitialNotes = ({ commit }, discussions) =>
  commit(types.SET_INITIAL_DISCUSSIONS, discussions);

export const setTargetNoteHash = ({ commit }, data) => commit(types.SET_TARGET_NOTE_HASH, data);

export const setNotesFetchedState = ({ commit }, state) =>
  commit(types.SET_NOTES_FETCHED_STATE, state);

export const toggleDiscussion = ({ commit }, data) => commit(types.TOGGLE_DISCUSSION, data);

export const fetchDiscussions = ({ commit }, path) =>
  service
    .fetchDiscussions(path)
    .then(res => res.json())
    .then(discussions => {
      commit(types.SET_INITIAL_DISCUSSIONS, discussions);
    });

export const refetchDiscussionById = ({ commit, state }, { path, discussionId }) =>
  new Promise(resolve => {
    service
      .fetchDiscussions(path)
      .then(res => res.json())
      .then(discussions => {
        const selectedDiscussion = discussions.find(discussion => discussion.id === discussionId);
        if (selectedDiscussion) {
          commit(types.UPDATE_DISCUSSION, selectedDiscussion);
          // We need to refetch as it is now the transformed one in state
          const discussion = utils.findNoteObjectById(state.discussions, discussionId);

          resolve(discussion);
        }
      })
      .catch(() => {});
  });

export const deleteNote = ({ commit }, note) =>
  service.deleteNote(note.path).then(() => {
    commit(types.DELETE_NOTE, note);
  });

export const updateNote = ({ commit }, { endpoint, note }) =>
  service
    .updateNote(endpoint, note)
    .then(res => res.json())
    .then(res => {
      commit(types.UPDATE_NOTE, res);
    });

export const replyToDiscussion = ({ commit }, { endpoint, data }) =>
  service
    .replyToDiscussion(endpoint, data)
    .then(res => res.json())
    .then(res => {
      commit(types.ADD_NEW_REPLY_TO_DISCUSSION, res);

      return res;
    });

export const createNewNote = ({ commit }, { endpoint, data }) =>
  service
    .createNewNote(endpoint, data)
    .then(res => res.json())
    .then(res => {
      if (!res.errors) {
        commit(types.ADD_NEW_NOTE, res);
      }
      return res;
    });

export const removePlaceholderNotes = ({ commit }) => commit(types.REMOVE_PLACEHOLDER_NOTES);

export const toggleResolveNote = ({ commit }, { endpoint, isResolved, discussion }) =>
  service
    .toggleResolveNote(endpoint, isResolved)
    .then(res => res.json())
    .then(res => {
      const mutationType = discussion ? types.UPDATE_DISCUSSION : types.UPDATE_NOTE;

      commit(mutationType, res);
    });

export const closeIssue = ({ commit, dispatch, state }) => {
  dispatch('toggleStateButtonLoading', true);
  return service
    .toggleIssueState(state.notesData.closePath)
    .then(res => res.json())
    .then(data => {
      commit(types.CLOSE_ISSUE);
      dispatch('emitStateChangedEvent', data);
      dispatch('toggleStateButtonLoading', false);
    });
};

export const reopenIssue = ({ commit, dispatch, state }) => {
  dispatch('toggleStateButtonLoading', true);
  return service
    .toggleIssueState(state.notesData.reopenPath)
    .then(res => res.json())
    .then(data => {
      commit(types.REOPEN_ISSUE);
      dispatch('emitStateChangedEvent', data);
      dispatch('toggleStateButtonLoading', false);
    });
};

export const toggleStateButtonLoading = ({ commit }, value) =>
  commit(types.TOGGLE_STATE_BUTTON_LOADING, value);

export const emitStateChangedEvent = ({ getters }, data) => {
  const event = new CustomEvent('issuable_vue_app:change', {
    detail: {
      data,
      isClosed: getters.openState === constants.CLOSED,
    },
  });

  document.dispatchEvent(event);
};

export const toggleIssueLocalState = ({ commit }, newState) => {
  if (newState === constants.CLOSED) {
    commit(types.CLOSE_ISSUE);
  } else if (newState === constants.REOPENED) {
    commit(types.REOPEN_ISSUE);
  }
};

export const saveNote = ({ commit, dispatch }, noteData) => {
  // For MR discussuions we need to post as `note[note]` and issue we use `note.note`.
  const note = noteData.data['note[note]'] || noteData.data.note.note;
  let placeholderText = note;
  const hasQuickActions = utils.hasQuickActions(placeholderText);
  const replyId = noteData.data.in_reply_to_discussion_id;
  const methodToDispatch = replyId ? 'replyToDiscussion' : 'createNewNote';

  $('.notes-form .flash-container').hide(); // hide previous flash notification
  commit(types.REMOVE_PLACEHOLDER_NOTES); // remove previous placeholders

  if (replyId) {
    if (hasQuickActions) {
      placeholderText = utils.stripQuickActions(placeholderText);
    }

    if (placeholderText.length) {
      commit(types.SHOW_PLACEHOLDER_NOTE, {
        noteBody: placeholderText,
        replyId,
      });
    }

    if (hasQuickActions) {
      commit(types.SHOW_PLACEHOLDER_NOTE, {
        isSystemNote: true,
        noteBody: utils.getQuickActionText(note),
        replyId,
      });
    }
  }

  return dispatch(methodToDispatch, noteData).then(res => {
    const { errors } = res;
    const commandsChanges = res.commands_changes;

    if (hasQuickActions && errors && Object.keys(errors).length) {
      eTagPoll.makeRequest();

      $('.js-gfm-input').trigger('clear-commands-cache.atwho');
      Flash('Commands applied', 'notice', noteData.flashContainer);
    }

    if (commandsChanges) {
      if (commandsChanges.emoji_award) {
        const votesBlock = $('.js-awards-block').eq(0);

        loadAwardsHandler()
          .then(awardsHandler => {
            awardsHandler.addAwardToEmojiBar(votesBlock, commandsChanges.emoji_award);
            awardsHandler.scrollToAwards();
          })
          .catch(() => {
            Flash(
              'Something went wrong while adding your award. Please try again.',
              'alert',
              noteData.flashContainer,
            );
          });
      }

      if (commandsChanges.spend_time != null || commandsChanges.time_estimate != null) {
        sidebarTimeTrackingEventHub.$emit('timeTrackingUpdated', res);
      }
    }

    if (errors && errors.commands_only) {
      Flash(errors.commands_only, 'notice', noteData.flashContainer);
    }
    if (replyId) {
      commit(types.REMOVE_PLACEHOLDER_NOTES);
    }

    return res;
  });
};

const pollSuccessCallBack = (resp, commit, state, getters, dispatch) => {
  if (resp.notes && resp.notes.length) {
    const { notesById } = getters;

    resp.notes.forEach(note => {
      if (notesById[note.id]) {
        commit(types.UPDATE_NOTE, note);
      } else if (note.type === constants.DISCUSSION_NOTE || note.type === constants.DIFF_NOTE) {
        const discussion = utils.findNoteObjectById(state.discussions, note.discussion_id);

        if (discussion) {
          commit(types.ADD_NEW_REPLY_TO_DISCUSSION, note);
        } else if (note.type === constants.DIFF_NOTE) {
          dispatch('fetchDiscussions', state.notesData.discussionsPath);
        } else {
          commit(types.ADD_NEW_NOTE, note);
        }
      } else {
        commit(types.ADD_NEW_NOTE, note);
      }
    });
  }

  commit(types.SET_LAST_FETCHED_AT, resp.last_fetched_at);

  return resp;
};

export const poll = ({ commit, state, getters, dispatch }) => {
  eTagPoll = new Poll({
    resource: service,
    method: 'poll',
    data: state,
    successCallback: resp =>
      resp.json().then(data => pollSuccessCallBack(data, commit, state, getters, dispatch)),
    errorCallback: () => Flash('Something went wrong while fetching latest comments.'),
  });

  if (!Visibility.hidden()) {
    eTagPoll.makeRequest();
  } else {
    service.poll(state);
  }

  Visibility.change(() => {
    if (!Visibility.hidden()) {
      eTagPoll.restart();
    } else {
      eTagPoll.stop();
    }
  });
};

export const stopPolling = () => {
  eTagPoll.stop();
};

export const restartPolling = () => {
  eTagPoll.restart();
};

export const fetchData = ({ commit, state, getters }) => {
  const requestData = {
    endpoint: state.notesData.notesPath,
    lastFetchedAt: state.lastFetchedAt,
  };

  service
    .poll(requestData)
    .then(resp => resp.json)
    .then(data => pollSuccessCallBack(data, commit, state, getters))
    .catch(() => Flash('Something went wrong while fetching latest comments.'));
};

export const toggleAward = ({ commit, getters }, { awardName, noteId }) => {
  commit(types.TOGGLE_AWARD, { awardName, note: getters.notesById[noteId] });
};

export const toggleAwardRequest = ({ dispatch }, data) => {
  const { endpoint, awardName } = data;

  return service
    .toggleAward(endpoint, { name: awardName })
    .then(res => res.json())
    .then(() => {
      dispatch('toggleAward', data);
    });
};

export const scrollToNoteIfNeeded = (context, el) => {
  if (!isInViewport(el[0])) {
    scrollToElement(el);
  }
};

export const fetchDiscussionDiffLines = ({ commit }, discussion) =>
  axios.get(discussion.truncatedDiffLinesPath).then(({ data }) => {
    commit(types.SET_DISCUSSION_DIFF_LINES, {
      discussionId: discussion.id,
      diffLines: data.truncated_diff_lines,
    });
  });

// prevent babel-plugin-rewire from generating an invalid default during karma tests
export default () => {};