'use strict'

const commands = require('redis-commands')
const Multi = require('./multi')
const RedisClient = require('../').RedisClient
const Command = require('./command')

// TODO: Rewrite this including the individual commands into a Commands class
// that provided a functionality to add new commands to the client
commands.list.forEach((command) => {
  // Some rare Redis commands use special characters in their command name
  // Convert those to a underscore to prevent using invalid function names
  const commandName = command.replace(/(?:^([0-9])|[^a-zA-Z0-9_$])/g, '_$1')

  // Do not override existing functions
  if (!RedisClient.prototype[command]) {
    RedisClient.prototype[command] = function () {
      let arr
      let len = arguments.length
      let callback
      let i = 0
      if (Array.isArray(arguments[0])) {
        arr = arguments[0]
        if (len === 2) {
          callback = arguments[1]
        }
      } else if (len > 1 && Array.isArray(arguments[1])) {
        if (len === 3) {
          callback = arguments[2]
        }
        len = arguments[1].length
        arr = new Array(len + 1)
        arr[0] = arguments[0]
        for (; i < len; i += 1) {
          arr[i + 1] = arguments[1][i]
        }
      } else {
        // The later should not be the average use case
        if (len !== 0 && (typeof arguments[len - 1] === 'function' || typeof arguments[len - 1] === 'undefined')) {
          len--
          callback = arguments[len]
        }
        arr = new Array(len)
        for (; i < len; i += 1) {
          arr[i] = arguments[i]
        }
      }
      return this.internalSendCommand(new Command(command, arr, callback))
    }
    if (RedisClient.prototype[command] !== commandName) {
      Object.defineProperty(RedisClient.prototype[command], 'name', {
        value: commandName
      })
    }
  }

  // Do not override existing functions
  if (!Multi.prototype[command]) {
    Multi.prototype[command] = function () {
      let arr
      let len = arguments.length
      let callback
      let i = 0
      if (Array.isArray(arguments[0])) {
        arr = arguments[0]
        if (len === 2) {
          callback = arguments[1]
        }
      } else if (len > 1 && Array.isArray(arguments[1])) {
        if (len === 3) {
          callback = arguments[2]
        }
        len = arguments[1].length
        arr = new Array(len + 1)
        arr[0] = arguments[0]
        for (; i < len; i += 1) {
          arr[i + 1] = arguments[1][i]
        }
      } else {
        // The later should not be the average use case
        if (len !== 0 && (typeof arguments[len - 1] === 'function' || typeof arguments[len - 1] === 'undefined')) {
          len--
          callback = arguments[len]
        }
        arr = new Array(len)
        for (; i < len; i += 1) {
          arr[i] = arguments[i]
        }
      }
      this.queue.push(new Command(command, arr, callback))
      return this
    }
    if (Multi.prototype[command] !== commandName) {
      Object.defineProperty(Multi.prototype[command], 'name', {
        value: commandName
      })
    }
  }
})