defmodule Juspay.Customers do
  import Juspay
  import Juspay.Exception

  @moduledoc """

  Represents a customer who is using your service.

  """

  @doc """

  Create a new customer entity. You may invoke this method whenever someone registers in your website or App.
  JusPay will respond with an ID that you can persist in your Database. Pass this ID at the time of order creation
  to ensure proper linking of orders/payments belonging to a customer.

  ## Examples

       # input in the form of map (works with both string keyed map and atom keyed map)

       iex> Juspay.Customers.create(%{ :object_reference_id => "guest_user",
                                  :mobile_number => "9988776655",
                                  :email_address => "customer@mail.com",
                                  :first_name => "John",
                                  :last_name => "Smith",
                                  :mobile_country_code => "91"
                                })

       # input in the form of list

       iex> Juspay.Customers.create([ object_reference_id: "guest_user",
                                mobile_number:"9988776655",
                                email_address: "customer@mail.com",
                                first_name: "John",
                                last_name: "Smith",
                                mobile_country_code: "91"
                              ])

      # response

      %{
        "id" => "cst_om2l6ctlptxwxuzj",
        "object" => "customer",
        "object_reference_id" => "guest_user",
        "mobile_number" => "9988776655",
        "date_created" => "2016-08-02T08:07:52+0000",
        "last_updated" => "2016-08-02T08:07:52+0000",
        "email_address" => "customer@gmail.com",
        "first_name" => "John",
        "last_name" => "Smith",
        "mobile_country_code" => "91"
      }

  """

  @spec create(list|map()) :: map()
  def create(parameters) do
    parameters = check_params(parameters)
    method = "POST"
    url = "/customers"
    response = request(method,url,parameters)
  end

  @doc false
  @spec list(list) :: list
  def list(parameters \\ []) do
    method = "GET"
    url = "/customers"
    offset = parameters[:offset]
    count = parameters[:count]
    if count == NIL and offset == NIL do
          IO.inspect "count & offset can be passed if required.\n"
    end
    response = request(method,url,[])
  end

  @doc """

  This will return customer information for given identifier.

  ## Examples

       # input in the form of map (works with both string keyed map and atom keyed map)

       iex> Juspay.Customers.get(%{ :customer_id => "guest_user" }) or Customers.create([customer_id: "guest_user" ])

       # input in the form of list

       iex> Juspay.Customers.get([ customer_id: "guest_user" ])

      # response

      %{
        "id" => "cst_om2l6ctlptxwxuzj",
        "object" => "customer",
        "object_reference_id" => "guest_user",
        "mobile_number" => "9988776655",
        "date_created" => "2016-08-02T08:07:52+0000",
        "last_updated" => "2016-08-02T08:07:52+0000",
        "email_address" => "customer@gmail.com",
        "first_name" => "John",
        "last_name" => "Smith",
        "mobile_country_code" => "91"
      }

  """
  @spec get(list|map()) :: map()
  def get(parameters) do
   parameters = check_params(parameters)
    customer_id =parameters[:customer_id]
    if customer_id == NIL do
      raise ArgumentError,Juspay.Exception.invalidArgumentError(" Error -> customer_id is a required field for Cards.get()")
    end
    method = "GET"
    url = "/customers/" <> customer_id
    response = request(method,url,parameters)
  end

  @doc """

  Update information related to a  particulat customer.

  ## Examples

       # input in the form of map (works with both string keyed map and atom keyed map)

       iex> Juspay.Customers.update(%{
                                :customer_id => "guest_user",
                                :mobile_number => "9988776688",
                                :customer_email => "customer@mail.com",
                                :first_name => "udpate_firstname",
                                :last_name =>"udpate_lastname",
                                :mobile_country_code => "91"
                              })

       # input in the form of list

       iex> Juspay.Customers.update([
                              customer_id: "guest_user",
                              mobile_number: "9988776688",
                              customer_email: "customer@mail.com",
                              first_name: "udpate_firstname",
                              last_name: "udpate_lastname",
                              mobile_country_code: "91"
                              ])

      # response

      %{
        "id" => "cst_om2l6ctlptxwxuzj",
        "object" => "customer",
        "object_reference_id" => "guest_user",
        "mobile_number" => "9988776688",
        "date_created" => "2016-08-02T08:07:52+0000",
        "last_updated" => "2016-08-02T08:07:58+0000",
        "email_address" => "customer@gmail.com",
        "first_name" => "John",
        "last_name" => "Smith",
        "mobile_country_code" => "91"
      }

  """

  @spec update(list|map()) :: map()
  def update(parameters) do
   parameters = check_params(parameters)
    customer_id =parameters[:customer_id]
    if customer_id == NIL do
      raise ArgumentError,Juspay.Exception.invalidArgumentError(" Error -> customer_id is a required field for Cards.update()")
    end
    method = "POST"
    url = "/customers/" <> customer_id
    response = request(method,url,parameters)
  end

  @doc false
  def  delete(parameters) do
    raise "ERROR: Not Implemented"
  end

end