import SimpleSchema from 'simpl-schema';
import Creatures from '/imports/api/creature/Creatures.js';
import { ValidatedMethod } from 'meteor/mdg:validated-method';
import { RateLimiterMixin } from 'ddp-rate-limiter-mixin';
import {assertEditPermission} from '/imports/api/creature/creaturePermissions.js';
import { parse, CompilationContext } from '/imports/parser/parser.js';
const PER_CREATURE_LOG_LIMIT = 100;

if (Meteor.isServer){
  var sendWebhookAsCreature = require('/imports/server/discord/sendWebhook.js').sendWebhookAsCreature;
}

let CreatureLogs = new Mongo.Collection('creatureLogs');

let CreatureLogSchema = new SimpleSchema({
	text: {
		type: String,
	},
  type: {
    type: String,
    allowedValues: ['roll', 'change', 'damage', 'info'],
    defaultValue: 'info',
  },
	// The real-world date that it occured, usually sorted by date
	date: {
		type: Date,
		autoValue: function() {
			// If the date isn't set, set it to now
			if (!this.isSet) {
				return new Date();
			}
		},
    index: 1,
	},
  creatureId: {
    type: String,
    regEx: SimpleSchema.RegEx.Id,
    index: 1,
  },
});

CreatureLogs.attachSchema(CreatureLogSchema);

function removeOldLogs(creatureId){
  // Find the first log that is over the limit
  let firstExpiredLog = CreatureLogs.find({
    creatureId
  }, {
    sort: {date: -1},
    skip: PER_CREATURE_LOG_LIMIT,
  });
  // Remove all logs older than the one over the limit
  CreatureLogs.remove({
    creatureId,
    date: {$lte: firstExpiredLog.date},
  });
}

function logWebhook({log, creature}){
  if (Meteor.isServer){
    sendWebhookAsCreature({
      creature,
      content: log.text,
    });
  }
}

const insertCreatureLog = new ValidatedMethod({
  name: 'creatureLogs.methods.insertCreatureLog',
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
	validate: new SimpleSchema({
		log: CreatureLogSchema.omit('type', 'date'),
	}).validator(),
  run({log}){
    const creatureId = log.creatureId;
    const creature = Creatures.findOne(creatureId, {fields: {
      readers: 1,
      writers: 1,
      owner: 1,
      'settings.discordWebhook': 1,
      name: 1,
      avatarPicture: 1,
    }});
    assertEditPermission(creature, this.userId);
    // Build the new log
    if (typeof log === 'string'){
      log = {text: log};
    }
    log.date = new Date();
    // Insert it
    let id = CreatureLogs.insert(log);
    if (Meteor.isServer){
      this.unblock();
      removeOldLogs(creatureId);
      logWebhook({log, creature});
    }
    return id;
  },
});


function equalIgnoringWhitespace(a, b){
  if (typeof a !== 'string' || typeof b !== 'string') return a === b;
  return a.replace(/\s/g,'') === b.replace(/\s/g, '');
}

const logRoll = new ValidatedMethod({
  name: 'creatureLogs.methods.logForCreature',
  mixins: [RateLimiterMixin],
  rateLimit: {
    numRequests: 5,
    timeInterval: 5000,
  },
	validate: new SimpleSchema({
		roll: {
			type: String,
		},
		creatureId: {
			type: String,
			regEx: SimpleSchema.RegEx.Id,
		},
	}).validator(),
  run({roll, creatureId}){
    const creature = Creatures.findOne(creatureId, {fields: {
      variables: 1,
      readers: 1,
      writers: 1,
      owner: 1,
      'settings.discordWebhook': 1,
      name: 1,
      avatarPicture: 1,
    }});
    assertEditPermission(creature, this.userId);
    let parsedResult = parse(roll);
    let logText;
    if (parsedResult === null) {
      logText = 'Unexpected end of input';
    }
    else try {
      logText = [];
      let rollContext = new CompilationContext();
      let compiled = parsedResult.compile(creature.variables, rollContext);
      let compiledString = compiled.toString();
      if (!equalIgnoringWhitespace(compiledString, roll)) logText.push(roll);
      logText.push(compiledString);
      let rolled = compiled.roll(creature.variables, rollContext);
      let rolledString = rolled.toString();
      if (rolledString !== compiledString) logText.push(rolled.toString());
      let result = rolled.reduce(creature.variables, rollContext);
      let resultString = result.toString();
      if (resultString !== rolledString) logText.push(resultString);
      logText = logText.join('\n\n');
    } catch (e){
      logText = 'Calculation error';
    }
    const log = {
      text: logText,
      creatureId,
      date: new Date(),
    };
    let id = CreatureLogs.insert(log);
    if (Meteor.isServer){
      this.unblock();
      removeOldLogs(creatureId);
      logWebhook({log, creature});
    }
    return id;
  },
});

export default CreatureLogs;
export { CreatureLogSchema, insertCreatureLog, logRoll};