Checklists = new Mongo.Collection('checklists');

Checklists.attachSchema(new SimpleSchema({
  cardId: {
    type: String,
  },
  title: {
    type: String,
  },
  items: {
    type: [Object],
    defaultValue: [],
  },
  'items.$._id': {
    type: String,
  },
  'items.$.title': {
    type: String,
  },
  'items.$.sort': {
    type: Number,
    decimal: true,
  },
  'items.$.isFinished': {
    type: Boolean,
    defaultValue: false,
  },
  finishedAt: {
    type: Date,
    optional: true,
  },
  createdAt: {
    type: Date,
    denyUpdate: false,
    autoValue() { // eslint-disable-line consistent-return
      if (this.isInsert) {
        return new Date();
      } else {
        this.unset();
      }
    },
  },
  sort: {
    type: Number,
    decimal: true,
  },
}));

const self = Checklists;

Checklists.helpers({
  itemCount() {
    return this.items.length;
  },
  getItemsSorted() {
    return _.sortBy(this.items, 'sort');
  },
  finishedCount() {
    return this.items.filter((item) => {
      return item.isFinished;
    }).length;
  },
  isFinished() {
    return 0 !== this.itemCount() && this.itemCount() === this.finishedCount();
  },
  getItem(_id) {
    return _.findWhere(this.items, { _id });
  },
  itemIndex(itemId) {
    const items = self.findOne({_id : this._id}).items;
    return _.pluck(items, '_id').indexOf(itemId);
  },
  getNewItemId() {
    const itemCount = this.itemCount();
    let idx = 0;
    if (itemCount > 0) {
      const lastId = this.items[itemCount - 1]._id;
      const lastIdSuffix = lastId.substr(this._id.length);
      idx = parseInt(lastIdSuffix, 10) + 1;
    }
    return `${this._id}${idx}`;
  },
});

Checklists.allow({
  insert(userId, doc) {
    return allowIsBoardMemberByCard(userId, Cards.findOne(doc.cardId));
  },
  update(userId, doc) {
    return allowIsBoardMemberByCard(userId, Cards.findOne(doc.cardId));
  },
  remove(userId, doc) {
    return allowIsBoardMemberByCard(userId, Cards.findOne(doc.cardId));
  },
  fetch: ['userId', 'cardId'],
});

Checklists.before.insert((userId, doc) => {
  doc.createdAt = new Date();
  if (!doc.userId) {
    doc.userId = userId;
  }
});

Checklists.mutations({
  //for checklist itself
  setTitle(title) {
    return { $set: { title } };
  },
  //for items in checklist
  addItem(title) {
    const _id = this.getNewItemId();
    return {
      $addToSet: {
        items: {
          _id, title,
          isFinished: false,
          sort: this.itemCount(),
        },
      },
    };
  },
  addFullItem(item) {
    const itemsUpdate = {};
    this.items.forEach(function(iterItem, index) {
      if (iterItem.sort >= item.sort) {
        itemsUpdate[`items.${index}.sort`] = iterItem.sort + 1;
      }
    });
    if (!_.isEmpty(itemsUpdate)) {
      self.direct.update({ _id: this._id }, { $set: itemsUpdate });
    }
    return { $addToSet: { items: item } };
  },
  removeItem(itemId) {
    const item = this.getItem(itemId);
    const itemsUpdate = {};
    this.items.forEach(function(iterItem, index) {
      if (iterItem.sort > item.sort) {
        itemsUpdate[`items.${index}.sort`] = iterItem.sort - 1;
      }
    });
    if (!_.isEmpty(itemsUpdate)) {
      self.direct.update({ _id: this._id }, { $set: itemsUpdate });
    }
    return { $pull: { items: { _id: itemId } } };
  },
  editItem(itemId, title) {
    if (this.getItem(itemId)) {
      const itemIndex = this.itemIndex(itemId);
      return {
        $set: {
          [`items.${itemIndex}.title`]: title,
        },
      };
    }
    return {};
  },
  finishItem(itemId) {
    if (this.getItem(itemId)) {
      const itemIndex = this.itemIndex(itemId);
      return {
        $set: {
          [`items.${itemIndex}.isFinished`]: true,
        },
      };
    }
    return {};
  },
  resumeItem(itemId) {
    if (this.getItem(itemId)) {
      const itemIndex = this.itemIndex(itemId);
      return {
        $set: {
          [`items.${itemIndex}.isFinished`]: false,
        },
      };
    }
    return {};
  },
  toggleItem(itemId) {
    const item = this.getItem(itemId);
    if (item) {
      const itemIndex = this.itemIndex(itemId);
      return {
        $set: {
          [`items.${itemIndex}.isFinished`]: !item.isFinished,
        },
      };
    }
    return {};
  },
  sortItems(itemIDs) {
    const validItems = [];
    itemIDs.forEach((itemID) => {
      if (this.getItem(itemID)) {
        validItems.push(this.itemIndex(itemID));
      }
    });
    const modifiedValues = {};
    for (let i = 0; i < validItems.length; i++) {
      modifiedValues[`items.${validItems[i]}.sort`] = i;
    }
    return {
      $set: modifiedValues,
    };
  },
});

if (Meteor.isServer) {
  Meteor.startup(() => {
    Checklists._collection._ensureIndex({ cardId: 1, createdAt: 1 });
  });

  Checklists.after.insert((userId, doc) => {
    Activities.insert({
      userId,
      activityType: 'addChecklist',
      cardId: doc.cardId,
      boardId: Cards.findOne(doc.cardId).boardId,
      checklistId: doc._id,
    });
  });

  //TODO: so there will be no activity for adding item into checklist, maybe will be implemented in the future.
  // The future is now
  Checklists.after.update((userId, doc, fieldNames, modifier) => {
    if (fieldNames.includes('items')) {
      if (modifier.$addToSet) {
        Activities.insert({
          userId,
          activityType: 'addChecklistItem',
          cardId: doc.cardId,
          boardId: Cards.findOne(doc.cardId).boardId,
          checklistId: doc._id,
          checklistItemId: modifier.$addToSet.items._id,
        });
      } else if (modifier.$pull) {
        const activity = Activities.findOne({
          checklistItemId: modifier.$pull.items._id,
        });
        if (activity) {
          Activities.remove(activity._id);
        }
      }
    }
  });

  Checklists.before.remove((userId, doc) => {
    const activities = Activities.find({ checklistId: doc._id });
    if (activities) {
      activities.forEach((activity) => {
        Activities.remove(activity._id);
      });
    }
  });
}

//CARD COMMENT REST API
if (Meteor.isServer) {
  JsonRoutes.add('GET', '/api/boards/:boardId/cards/:cardId/checklists', function (req, res, next) {
    try {
      Authentication.checkUserId( req.userId);
      const paramCardId = req.params.cardId;
      JsonRoutes.sendResult(res, {
        code: 200,
        data: Checklists.find({ cardId: paramCardId }).map(function (doc) {
          return {
            _id: doc._id,
            title: doc.title,
          };
        }),
      });
    }
    catch (error) {
      JsonRoutes.sendResult(res, {
        code: 200,
        data: error,
      });
    }
  });

  JsonRoutes.add('GET', '/api/boards/:boardId/cards/:cardId/checklists/:checklistId', function (req, res, next) {
    try {
      Authentication.checkUserId( req.userId);
      const paramChecklistId = req.params.checklistId;
      const paramCardId = req.params.cardId;
      JsonRoutes.sendResult(res, {
        code: 200,
        data: Checklists.findOne({ _id: paramChecklistId, cardId: paramCardId }),
      });
    }
    catch (error) {
      JsonRoutes.sendResult(res, {
        code: 200,
        data: error,
      });
    }
  });

  JsonRoutes.add('POST', '/api/boards/:boardId/cards/:cardId/checklists', function (req, res, next) {
    try {
      Authentication.checkUserId( req.userId);
      const paramCardId = req.params.cardId;

      const checklistToSend = {};
      checklistToSend.cardId = paramCardId;
      checklistToSend.title = req.body.title;
      checklistToSend.items = [];
      const id = Checklists.insert(checklistToSend);
      const checklist = Checklists.findOne({_id: id});
      req.body.items.forEach(function (item) {
        checklist.addItem(item);
      }, this);


      JsonRoutes.sendResult(res, {
        code: 200,
        data: {
          _id: id,
        },
      });
    }
    catch (error) {
      JsonRoutes.sendResult(res, {
        code: 200,
        data: error,
      });
    }
  });

  JsonRoutes.add('DELETE', '/api/boards/:boardId/cards/:cardId/checklists/:checklistId', function (req, res, next) {
    try {
      Authentication.checkUserId( req.userId);
      const paramCommentId = req.params.commentId;
      const paramCardId = req.params.cardId;
      Checklists.remove({ _id: paramCommentId, cardId: paramCardId });
      JsonRoutes.sendResult(res, {
        code: 200,
        data: {
          _id: paramCardId,
        },
      });
    }
    catch (error) {
      JsonRoutes.sendResult(res, {
        code: 200,
        data: error,
      });
    }
  });
}