import trelloMembersMapper from './trelloMembersMapper';
import wekanMembersMapper from './wekanMembersMapper';

BlazeComponent.extendComponent({
  title() {
    return `import-board-title-${Session.get('importSource')}!`;
  },
}).register('importHeaderBar');

BlazeComponent.extendComponent({
  onCreated() {
    this.error = new ReactiveVar('');
    this.steps = ['importTextarea', 'importMapMembers'];
    this._currentStepIndex = new ReactiveVar(0);
    this.importedData = new ReactiveVar();
    this.membersToMap = new ReactiveVar([]);
    this.importSource = Session.get('importSource');
  },

  currentTemplate() {
    return this.steps[this._currentStepIndex.get()];
  },

  nextStep() {
    const nextStepIndex = this._currentStepIndex.get() + 1;
    if (nextStepIndex >= this.steps.length) {
      this.finishImport();
    } else {
      this._currentStepIndex.set(nextStepIndex);
    }
  },

  importData(evt) {
    evt.preventDefault();
    const dataJson = this.find('.js-import-json').value;
    try {
      const dataObject = JSON.parse(dataJson);
      this.setError('');
      this.importedData.set(dataObject);
      const membersToMap = this._prepareAdditionalData(dataObject);
      // store members data and mapping in Session
      // (we go deep and 2-way, so storing in data context is not a viable option)
      this.membersToMap.set(membersToMap);
      this.nextStep();
    } catch (e) {
      this.setError('error-json-malformed');
    }
  },

  setError(error) {
    this.error.set(error);
  },

  finishImport() {
    const additionalData = {};
    const membersMapping = this.membersToMap.get();
    if (membersMapping) {
      const mappingById = {};
      membersMapping.forEach((member) => {
        if (member.wekanId) {
          mappingById[member.id] = member.wekanId;
        }
      });
      additionalData.membersMapping = mappingById;
    }
    this.membersToMap.set([]);
    Meteor.call('importBoard',
      this.importedData.get(),
      additionalData,
      this.importSource,
      (err, res) => {
        if (err) {
          this.setError(err.error);
        } else {
          Utils.goBoardId(res);
        }
      }
    );
  },

  _prepareAdditionalData(dataObject) {
    const importSource = Session.get('importSource');
    let membersToMap;
    switch (importSource) {
    case 'trello':
      membersToMap = trelloMembersMapper.getMembersToMap(dataObject);
      break;
    case 'wekan':
      membersToMap = wekanMembersMapper.getMembersToMap(dataObject);
      break;
    }
    return membersToMap;
  },

  _screenAdditionalData() {
    return 'mapMembers';
  },
}).register('import');

BlazeComponent.extendComponent({
  template() {
    return 'importTextarea';
  },

  instruction() {
    return `import-board-instruction-${Session.get('importSource')}!`;
  },

  events() {
    return [{
      submit(evt) {
        return this.parentComponent().importData(evt);
      },
    }];
  },
}).register('importTextarea');

BlazeComponent.extendComponent({
  onCreated() {
    this.autorun(() => {
      this.parentComponent().membersToMap.get().forEach(({ wekanId }) => {
        if (wekanId) {
          this.subscribe('user-miniprofile', wekanId);
        }
      });
    });
  },

  members() {
    return this.parentComponent().membersToMap.get();
  },

  _refreshMembers(listOfMembers) {
    return this.parentComponent().membersToMap.set(listOfMembers);
  },

  /**
   * Will look into the list of members to import for the specified memberId,
   * then set its property to the supplied value.
   * If unset is true, it will remove the property from the rest of the list as well.
   *
   * use:
   * - memberId = null to use selected member
   * - value = null to unset a property
   * - unset = true to ensure property is only set on 1 member at a time
   */
  _setPropertyForMember(property, value, memberId, unset = false) {
    const listOfMembers = this.members();
    let finder = null;
    if(memberId) {
      finder = (member) => member.id === memberId;
    } else {
      finder = (member) => member.selected;
    }
    listOfMembers.forEach((member) => {
      if(finder(member)) {
        if(value !== null) {
          member[property] = value;
        } else {
          delete member[property];
        }
        if(!unset) {
          // we shortcut if we don't care about unsetting the others
          return false;
        }
      } else if(unset) {
        delete member[property];
      }
      return true;
    });
    // Session.get gives us a copy, we have to set it back so it sticks
    this._refreshMembers(listOfMembers);
  },

  setSelectedMember(memberId) {
    return this._setPropertyForMember('selected', true, memberId, true);
  },

  /**
   * returns the member with specified id,
   * or the selected member if memberId is not specified
   */
  getMember(memberId = null) {
    const allMembers = this.members();
    let finder = null;
    if (memberId) {
      finder = (user) => user.id === memberId;
    } else {
      finder = (user) => user.selected;
    }
    return allMembers.find(finder);
  },

  mapSelectedMember(wekanId) {
    return this._setPropertyForMember('wekanId', wekanId, null);
  },

  unmapMember(memberId){
    return this._setPropertyForMember('wekanId', null, memberId);
  },

  onSubmit(evt) {
    evt.preventDefault();
    this.parentComponent().nextStep();
  },

  onMapMember(evt) {
    const memberToMap = this.currentData();
    if(memberToMap.wekan) {
      // todo xxx ask for confirmation?
      this.unmapMember(memberToMap.id);
    } else {
      this.setSelectedMember(memberToMap.id);
      Popup.open('importMapMembersAdd')(evt);
    }
  },

  events() {
    return [{
      'submit': this.onSubmit,
      'click .js-select-member': this.onMapMember,
    }];
  },
}).register('importMapMembers');

BlazeComponent.extendComponent({
  onRendered() {
    this.find('.js-map-member input').focus();
  },

  onSelectUser(){
    Popup.getOpenerComponent().mapSelectedMember(this.currentData()._id);
    Popup.back();
  },

  events() {
    return [{
      'click .js-select-import': this.onSelectUser,
    }];
  },
}).register('importMapMembersAddPopup');