ESX.EnsureMigrations = function(module)

  print('[esx] ensure migrations => ' .. module)

  local dir

  if module == 'base' then
    dir = 'migrations'
  else
    dir = 'modules/' .. module .. '/migrations'
  end

  local result      = MySQL.Sync.fetchAll('SELECT * FROM `migrations` WHERE `module` = @module', {['@module'] = module})
  local initial     = true
  local i           = 0
  local hasmigrated = false

  if #result > 0 then
    i           = result[1].last + 1
    initial     = false
  end

  local sql = nil

  repeat

    sql = LoadResourceFile(GetCurrentResourceName(), dir .. '/' .. i .. '.sql')

    if sql ~= nil then

      print('[esx] [' .. module .. '] => running migration #' .. i)

      MySQL.Sync.execute(sql)

      if initial then
        MySQL.Sync.execute('INSERT INTO `migrations` (module, last) VALUES (@module, @last)', {['@module'] = module, ['@last'] = 0})
      else
        MySQL.Sync.execute('UPDATE `migrations` SET `last` = @last WHERE `module` = @module', {['@module'] = module, ['@last'] = i})
      end

      hasmigrated = true

    end

    i = i + 1

  until sql == nil

  if not hasmigrated then
    -- print('[esx] [' .. module .. '] => no pending migration')
  end

end

ESX.FileExists = function(name)

  local f=io.open(name, 'r')

  if f~=nil then
    io.close(f)
    return true
  else
    return false
  end

end

ESX.Trace = function(msg)
	if Config.EnableDebug then
		print(('[es_extended] [^2TRACE^7] %s^7'):format(msg))
	end
end

ESX.SetTimeout = function(msec, cb)
	local id = ESX.TimeoutCount + 1

	SetTimeout(msec, function()
		if ESX.CancelledTimeouts[id] then
			ESX.CancelledTimeouts[id] = nil
		else
			cb()
		end
	end)

	ESX.TimeoutCount = id

	return id
end

ESX.RegisterCommand = function(name, group, cb, allowConsole, suggestion)
	if type(name) == 'table' then
		for k,v in ipairs(name) do
			ESX.RegisterCommand(v, group, cb, allowConsole, suggestion)
		end

		return
	end

	if ESX.RegisteredCommands[name] then
		print(('[es_extended] [^3WARNING^7] An command "%s" is already registered, overriding command'):format(name))

		if ESX.RegisteredCommands[name].suggestion then
			TriggerClientEvent('chat:removeSuggestion', -1, ('/%s'):format(name))
		end
	end

	if suggestion then
		if not suggestion.arguments then suggestion.arguments = {} end
		if not suggestion.help then suggestion.help = '' end

		TriggerClientEvent('chat:addSuggestion', -1, ('/%s'):format(name), suggestion.help, suggestion.arguments)
	end

	ESX.RegisteredCommands[name] = {group = group, cb = cb, allowConsole = allowConsole, suggestion = suggestion}

	RegisterCommand(name, function(playerId, args, rawCommand)
		local command = ESX.RegisteredCommands[name]

		if not command.allowConsole and playerId == 0 then
			print(('[es_extended] [^3WARNING^7] %s'):format(_U('commanderror_console')))
		else
			local xPlayer, error = ESX.GetPlayerFromId(playerId), nil

			if command.suggestion then
				if command.suggestion.validate then
					if #args ~= #command.suggestion.arguments then
						error = _U('commanderror_argumentmismatch', #args, #command.suggestion.arguments)
					end
				end

				if not error and command.suggestion.arguments then
					local newArgs = {}

					for k,v in ipairs(command.suggestion.arguments) do
						if v.type then
							if v.type == 'number' then
								local newArg = tonumber(args[k])

								if newArg then
									newArgs[v.name] = newArg
								else
									error = _U('commanderror_argumentmismatch_number', k)
								end
							elseif v.type == 'player' or v.type == 'playerId' then
								local targetPlayer = tonumber(args[k])

								if args[k] == 'me' then targetPlayer = playerId end

								if targetPlayer then
									local xTargetPlayer = ESX.GetPlayerFromId(targetPlayer)

									if xTargetPlayer then
										if v.type == 'player' then
											newArgs[v.name] = xTargetPlayer
										else
											newArgs[v.name] = targetPlayer
										end
									else
										error = _U('commanderror_invalidplayerid')
									end
								else
									error = _U('commanderror_argumentmismatch_number', k)
								end
							elseif v.type == 'string' then
								newArgs[v.name] = args[k]
							elseif v.type == 'item' then
								if ESX.Items[args[k]] then
									newArgs[v.name] = args[k]
								else
									error = _U('commanderror_invaliditem')
								end
							elseif v.type == 'weapon' then
								if ESX.GetWeapon(args[k]) then
									newArgs[v.name] = string.upper(args[k])
								else
									error = _U('commanderror_invalidweapon')
								end
							elseif v.type == 'any' then
								newArgs[v.name] = args[k]
							end
						end

						if error then break end
					end

					args = newArgs
				end
			end

			if error then
				if playerId == 0 then
					print(('[es_extended] [^3WARNING^7] %s^7'):format(error))
				else
					xPlayer.triggerEvent('chat:addMessage', {args = {'^1SYSTEM', error}})
				end
			else
				cb(xPlayer or false, args, function(msg)
					if playerId == 0 then
						print(('[es_extended] [^3WARNING^7] %s^7'):format(msg))
					else
						xPlayer.triggerEvent('chat:addMessage', {args = {'^1SYSTEM', msg}})
					end
				end)
			end
		end
	end, true)

	if type(group) == 'table' then
		for k,v in ipairs(group) do
			ExecuteCommand(('add_ace group.%s command.%s allow'):format(v, name))
		end
	else
		ExecuteCommand(('add_ace group.%s command.%s allow'):format(group, name))
	end
end

ESX.ClearTimeout = function(id)
	ESX.CancelledTimeouts[id] = true
end

ESX.RegisterServerCallback = function(name, cb)
	ESX.ServerCallbacks[name] = cb
end

ESX.TriggerServerCallback = function(name, requestId, source, cb, ...)
	if ESX.ServerCallbacks[name] then
		ESX.ServerCallbacks[name](source, cb, ...)
	else
		print(('[es_extended] [^3WARNING^7] Server callback "%s" does not exist. Make sure that the server sided file really is loading, an error in that file might cause it to not load.'):format(name))
	end
end

ESX.SavePlayer = function(xPlayer, cb)

  local data       = xPlayer.serializeDB()
  local statement  = 'UPDATE users SET'
  local fields     = {}

  local first = true

  for k,v in pairs(data) do

    if first then
      statement = statement .. ' `' .. k .. '` = ' .. '@' .. k
      first = false
    else
      statement = statement .. ', `' .. k .. '` = ' .. '@' .. k
    end

    fields['@' .. k] = v

  end

  statement = statement .. ' WHERE `identifier` = @identifier'

  print(statement)
  print(ESX.DumpTable(fields))

  MySQL.Async.execute(statement, fields, function(rowsChanged)

		print(('[es_extended] [^2INFO^7] Saved player "%s^7"'):format(xPlayer.getName()))

    if cb then
			cb()
    end

  end)

end

ESX.SavePlayers = function(cb)
	local xPlayers, asyncTasks = ESX.GetPlayers(), {}

	for i=1, #xPlayers, 1 do
		table.insert(asyncTasks, function(cb2)
			local xPlayer = ESX.GetPlayerFromId(xPlayers[i])
			ESX.SavePlayer(xPlayer, cb2)
		end)
	end

	Async.parallelLimit(asyncTasks, 8, function(results)
		print(('[es_extended] [^2INFO^7] Saved %s player(s)'):format(#xPlayers))
		if cb then
			cb()
		end
	end)
end

ESX.StartDBSync = function()
	function saveData()
		ESX.SavePlayers()
		SetTimeout(10 * 60 * 1000, saveData)
	end

	SetTimeout(10 * 60 * 1000, saveData)
end

ESX.GetPlayers = function()
	local sources = {}

	for k,v in pairs(ESX.Players) do
		table.insert(sources, k)
	end

	return sources
end

ESX.GetPlayerFromId = function(source)
	return ESX.Players[tonumber(source)]
end

ESX.GetPlayerFromIdentifier = function(identifier)
	for k,v in pairs(ESX.Players) do
		if v.identifier == identifier then
			return v
		end
	end
end

ESX.RegisterUsableItem = function(item, cb)
	ESX.UsableItemsCallbacks[item] = cb
end

ESX.UseItem = function(source, item)
	ESX.UsableItemsCallbacks[item](source)
end

ESX.GetItemLabel = function(item)
	if ESX.Items[item] then
		return ESX.Items[item].label
	end
end

ESX.CreatePickup = function(type, name, count, label, playerId, components, tintIndex)
	local pickupId = (ESX.PickupId == 65635 and 0 or ESX.PickupId + 1)
	local xPlayer = ESX.GetPlayerFromId(playerId)

	ESX.Pickups[pickupId] = {
		type  = type,
		name  = name,
		count = count,
		label = label,
		coords = xPlayer.getCoords(),
	}

	if type == 'item_weapon' then
		ESX.Pickups[pickupId].components = components
		ESX.Pickups[pickupId].tintIndex = tintIndex
	end

	TriggerClientEvent('esx:createPickup', -1, pickupId, label, playerId, type, name, components, tintIndex)
	ESX.PickupId = pickupId
end

ESX.DoesJobExist = function(job, grade)
	grade = tostring(grade)

	if job and grade then
		if ESX.Jobs[job] and ESX.Jobs[job].grades[grade] then
			return true
		end
	end

	return false
end