import { Meteor } from 'meteor/meteor';
import { Mongo } from 'meteor/mongo';
import { ValidatedMethod } from 'meteor/mdg:validated-method';
import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
import SimpleSchema from 'simpl-schema';
import ColorSchema from '/imports/api/properties/subSchemas/ColorSchema.js';
import ChildSchema, { RefSchema } from '/imports/api/parenting/ChildSchema.js';
import propertySchemasIndex from '/imports/api/properties/propertySchemasIndex.js';
import Libraries from '/imports/api/library/Libraries.js';
import { assertEditPermission } from '/imports/api/sharing/sharingPermissions.js';
import { softRemove } from '/imports/api/parenting/softRemove.js';
import SoftRemovableSchema from '/imports/api/parenting/SoftRemovableSchema.js';
import { storedIconsSchema } from '/imports/api/icons/Icons.js';
import '/imports/api/library/methods/index.js';
import { updateReferenceNodeWork } from '/imports/api/library/methods/updateReferenceNode.js';
import STORAGE_LIMITS from '/imports/constants/STORAGE_LIMITS.js';
import { restore } from '/imports/api/parenting/softRemove.js';
import { getAncestry } from '/imports/api/parenting/parenting.js';
import { reorderDocs } from '/imports/api/parenting/order.js';

let LibraryNodes = new Mongo.Collection('libraryNodes');

let LibraryNodeSchema = new SimpleSchema({
  _id: {
    type: String,
    regEx: SimpleSchema.RegEx.Id,
  },
  type: {
    type: String,
    allowedValues: Object.keys(propertySchemasIndex),
  },
  tags: {
    type: Array,
    defaultValue: [],
    maxCount: STORAGE_LIMITS.tagCount,
  },
  'tags.$': {
    type: String,
    max: STORAGE_LIMITS.tagLength,
  },
  icon: {
    type: storedIconsSchema,
    optional: true,
    max: STORAGE_LIMITS.icon,
  },

  // Library-specific properties, these can be stripped from the resulting
  // creature properties

  // Will this property show up in the slot-fill dialog
  fillSlots: {
    type: Boolean,
    optional: true,
    index: 1,
  },
  // Will this property show up in the insert-from-library dialog
  searchable: {
    type: Boolean,
    optional: true,
    index: 1,
  },
  libraryTags: {
    type: Array,
    optional: true,
    maxCount: STORAGE_LIMITS.tagCount,
  },
  'libraryTags.$': {
    type: String,
    max: STORAGE_LIMITS.tagLength,
  },
  // Overrides the type when searching for properties
  slotFillerType: {
    type: String,
    optional: true,
    max: STORAGE_LIMITS.variableName,
  },
  // Image to display when filling the slot
  slotFillImage: {
    type: String,
    optional: true,
    max: STORAGE_LIMITS.url,
  },
  // Fill more than one quantity in a slot, like feats and ability score
  // improvements, filtered out of UI if there isn't space in quantityExpected
  slotQuantityFilled: {
    type: SimpleSchema.Integer,
    optional: true, // Undefined implies 1
  },
  // Filters out of UI if condition isn't met, but isn't otherwise enforced
  slotFillerCondition: {
    type: String,
    optional: true,
    max: STORAGE_LIMITS.calculation,
  },
  // Text to display if slot filler condition fails
  slotFillerConditionNote: {
    type: String,
    optional: true,
    max: STORAGE_LIMITS.calculation,
  },
});

// Set up server side search index
if (Meteor.isServer) {
  LibraryNodes._ensureIndex({
    'name': 'text',
    'tags': 'text',
  });
}

for (let key in propertySchemasIndex) {
  let schema = new SimpleSchema({});
  schema.extend(LibraryNodeSchema);
  schema.extend(ColorSchema);
  schema.extend(propertySchemasIndex[key]);
  schema.extend(ChildSchema);
  schema.extend(SoftRemovableSchema);
  LibraryNodes.attachSchema(schema, {
    selector: { type: key }
  });
}

function getLibrary(node) {
  if (!node) throw new Meteor.Error('No node provided');
  let library = Libraries.findOne(node.ancestors[0].id);
  if (!library) throw new Meteor.Error('Library does not exist');
  return library;
}

function assertNodeEditPermission(node, userId) {
  let lib = getLibrary(node);
  return assertEditPermission(lib, userId);
}

const insertNode = new ValidatedMethod({
  name: 'libraryNodes.insert',
  validate: new SimpleSchema({
    libraryNode: {
      type: Object,
      blackbox: true,
    },
    parentRef: RefSchema,
  }).validator(),
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
  run({ libraryNode, parentRef }) {
    // get the new ancestry
    let { parentDoc, ancestors } = getAncestry({ parentRef });

    // Check permission to edit
    let root;
    if (parentRef.collection === 'libraries') {
      root = parentDoc;
    } else if (parentRef.collection === 'libraryNodes') {
      root = Libraries.findOne(parentDoc.ancestors[0].id);
    } else {
      throw `${parentRef.collection} is not a valid parent collection`
    }
    assertEditPermission(root, this.userId);

    // Set the ancestry of the library node
    libraryNode.parent = parentRef;
    libraryNode.ancestors = ancestors;
    // Remove its ID if it came with one to force a random one to be generated
    // server-side
    delete libraryNode._id;

    // Insert the node
    const nodeId = LibraryNodes.insert(libraryNode);

    // Update the node if it was a reference node
    if (libraryNode.type == 'reference') {
      libraryNode._id = nodeId;
      updateReferenceNodeWork(libraryNode, this.userId);
    }

    // Tree structure changed by insert, reorder the tree
    reorderDocs({
      collection: LibraryNodes,
      ancestorId: root._id,
    });

    // Return the id of the inserted node
    return nodeId;
  },
});

const updateLibraryNode = new ValidatedMethod({
  name: 'libraryNodes.update',
  validate({ _id, path }) {
    if (!_id) return false;
    // We cannot change these fields with a simple update
    switch (path[0]) {
      case 'type':
      case 'order':
      case 'parent':
      case 'ancestors':
        return false;
    }
  },
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
  run({ _id, path, value }) {
    let node = LibraryNodes.findOne(_id);
    assertNodeEditPermission(node, this.userId);
    let pathString = path.join('.');
    let modifier;
    // unset empty values
    if (value === null || value === undefined) {
      modifier = { $unset: { [pathString]: 1 } };
    } else {
      modifier = { $set: { [pathString]: value } };
    }
    let numUpdated = LibraryNodes.update(_id, modifier, {
      selector: { type: node.type },
    });
    if (node.type == 'reference') {
      node = LibraryNodes.findOne(_id);
      updateReferenceNodeWork(node, this.userId);
    }
    return numUpdated;
  },
});

const pushToLibraryNode = new ValidatedMethod({
  name: 'libraryNodes.push',
  validate: null,
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
  run({ _id, path, value }) {
    let node = LibraryNodes.findOne(_id);
    assertNodeEditPermission(node, this.userId);
    return LibraryNodes.update(_id, {
      $push: { [path.join('.')]: value },
    }, {
      selector: { type: node.type },
    });
  }
});

const pullFromLibraryNode = new ValidatedMethod({
  name: 'libraryNodes.pull',
  validate: null,
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
  run({ _id, path, itemId }) {
    let node = LibraryNodes.findOne(_id);
    assertNodeEditPermission(node, this.userId);
    return LibraryNodes.update(_id, {
      $pull: { [path.join('.')]: { _id: itemId } },
    }, {
      selector: { type: node.type },
      getAutoValues: false,
    });
  }
});

const softRemoveLibraryNode = new ValidatedMethod({
  name: 'libraryNodes.softRemove',
  validate: new SimpleSchema({
    _id: SimpleSchema.RegEx.Id
  }).validator(),
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
  run({ _id }) {
    let node = LibraryNodes.findOne(_id);
    assertNodeEditPermission(node, this.userId);
    softRemove({ _id, collection: LibraryNodes });
  }
});

const restoreLibraryNode = new ValidatedMethod({
  name: 'libraryNodes.restore',
  validate: new SimpleSchema({
    _id: SimpleSchema.RegEx.Id
  }).validator(),
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
  run({ _id }) {
    // Permissions
    let node = LibraryNodes.findOne(_id);
    assertNodeEditPermission(node, this.userId);
    // Do work
    restore({ _id, collection: LibraryNodes });
  }
});

export default LibraryNodes;
export {
  LibraryNodeSchema,
  insertNode,
  updateLibraryNode,
  pullFromLibraryNode,
  pushToLibraryNode,
  softRemoveLibraryNode,
  restoreLibraryNode,
};