module TextMagic

  class API

    extend Charset
    extend Validation

    # Creates new API instance with specified credentials. These will be
    # used in all requests to the TextMagic SMS gateway done through
    # this instance. Multiple instances with different credentials can
    # be used at the same time.
    #
    # Example usage:
    #
    #   api = TextMagic::API.new("fred", "secret")
    def initialize(username, password)
      @username = username
      @password = password
    end

    # Executes an account command by sending a request to the TextMagic's
    # SMS gateway.
    #
    # This method returns an object with balance attribute.
    # In case the request to the SMS gateway is not successful or the server
    # returns an error response, an Error is raised.
    #
    # Example usage:
    #
    #  api.account.balance
    #  # => 314.15
    def account
      hash = Executor.execute("account", @username, @password)
      TextMagic::API::Response.account(hash)
    end

    # Executes a send command by sending a request to the TextMagic's
    # SMS gateway.
    #
    # If called with a single phone number, this method returns a string message id.
    # If called with multiple phone numbers, it will return an hash of message ids
    # with phone numbers as keys.
    # In both cases the returned object is extended with +sent_text+ and +parts_count+
    # attributes.
    # In case the request to the SMS gateway is not successful or the server returns
    # an error response, an Error is raised.
    #
    # The optional parameters you can specify in the options Hash are:
    # * +unicode+: accepted values are +true+, +false+, +0+ and +1+. If not specified,
    #   the method will determine the unicode value based on the characters in
    #   the text.
    # * +max_length+: accepted values are +nil+, +1+, +2+ and +3+, defaults to nil.
    #   If not specified, the SMS gateway will apply its own default value.
    # * +send_time+: allows you to postpone sending of the message. Note that the message
    #   will be sent to the SMS gateway immediately and will wait there until the specified
    #   time. You can either supply a numeric value denoting number of seconds since
    #   1.1.1970, or a Time object.
    #
    # Example usage:
    #
    #  api.send("Hi Wilma", "999314159265")
    #  # => "141421"
    #  response = api.send("Hello everybody", "999314159265", "999271828182", :max_length => 2)
    #  # => { "999314159265" => "141421", "999271828182" => "173205" }
    #  response.parts_count
    #  # => 1
    #
    # Multiple phone numbers can be supplied as an array or as a list of arguments:
    #
    #  api.send("Hello everybody", ["999314159265", "999271828182"])
    #  api.send("Hello everybody", "999314159265", "999271828182")
    #
    # If you want to send a message to a single phone number but still
    # want to get a hash response, put the phone number in an array:
    #
    #  api.send("Hi Barney", ["999271828182"])
    #
    # Postponed sending:
    #
    #  api.send("Two hours later", "999314159265", :send_time => Time.now.to_i + 7200)
    def send(text, *args)
      raise Error.new(1, "Message text is empty") unless text
      options = args.last.is_a?(Hash) ? args.pop : {}
      unicode = API.is_unicode(text)
      options[:unicode] = case options[:unicode]
      when 1, true then 1
      when 0, false then 0
      when nil then unicode ? 1 : 0
      else raise Error.new(10, "Wrong parameter value #{options[:unicode]} for parameter unicode")
      end
      raise Error.new(6, "Message contains invalid characters") if unicode && options[:unicode].zero?
      raise Error.new(7, "Message too long") unless API.validate_text_length(text, unicode)
      single = args.size == 1 && args.first.is_a?(String)
      phones = args.flatten
      raise Error.new(9, "Invalid phone number format") unless API.validate_phones(phones)
      options[:send_time] = options[:send_time].to_i if options[:send_time]
      hash = Executor.execute("send", @username, @password, options.merge(text: text, phone: phones.join(",")))
      TextMagic::API::Response.send(hash, single)
    end

    # Executes a message_status command by sending a request to the TextMagic's
    # SMS gateway.
    #
    # If called with a single +id+, this method returns a single string value
    # denoting the message status. This string is extended with custom attributes
    # +text+, +status+, +created_time+, +completed_time+, +reply_number+ and
    # +credits_cost+. If called with multiple ids, it returns a hash of such
    # strings with message ids as keys.
    # In case the request to the SMS gateway is not successful or the server returns
    # an error response, an Error is raised.
    #
    # Example usage:
    #
    #  status = api.message_status("141421")
    #  # => "d"
    #  status.completed_time
    #  # => Fri May 22 10:10:18 +0200 2009
    #
    # Example with multiple ids:
    #
    #  statuses = api.message_status("141421", "173205")
    #  # => { "141421" => "r", "173205" => "d" }
    #  statuses["141421"].text
    #  # => "Hi Wilma"
    #  statuses["173205"].created_time
    #  # => Thu May 28 16:41:45 +0200 2009
    #
    # Multiple ids can be supplied as an array or as a list of arguments:
    #
    #  api.send("Hello everybody", ["999314159265", "999271828182"])
    #  api.send("Hello everybody", "999314159265", "999271828182")
    #
    # If you want to request status for a single message but still want to get
    # a hash response, put the id in an array:
    #
    #  api.message_status(["141421"])
    #
    # <b>It is strongly encouraged to setup callbacks to receive updates on message status
    # instead of using this method.</b>
    def message_status(*ids)
      single = ids.size == 1 && ids.first.is_a?(String)
      ids.flatten!
      raise TextMagic::API::Error.new(4, "Insufficient parameters") if ids.empty?
      hash = Executor.execute("message_status", @username, @password, ids: ids.join(","))
      TextMagic::API::Response.message_status(hash, single)
    end
    alias status message_status

    # Executes a receive command by sending a request to the TextMagic's
    # SMS gateway.
    #
    # This method returnes an array with retrieved messages. Every member of
    # the array is a string with +from+, +text+, +timestamp+ and +message_id+
    # attributes. The value of every string contains a phone number and text.
    # In case the request to the SMS gateway is not successful or the server returns
    # an error response, an Error is raised.
    #
    # This method accepts an optional +last_retrieved_id+ value. If called
    # with this argument, the gateway will only return replies newer than the
    # one with specified id.
    #
    # Example usage:
    #
    #  replies = api.receive
    #  # => ["999271828182: Hello Fred", "999314159265: Good day"]
    #  replies.first.text
    #  # => "Hello Fred"
    #  replies.first.from
    #  # => "999314159265"
    #  replies.last.message_id
    #  # => "223606"
    #  api.receive "223606"
    #  # => []
    #
    # <b>It is strongly encouraged to setup callbacks to receive replies instead of
    # using this method.</b>
    def receive(last_retrieved_id = nil)
      hash = Executor.execute("receive", @username, @password, last_retrieved_id: last_retrieved_id)
      TextMagic::API::Response.receive(hash)
    end

    # Executes a delete_reply command by sending a request to the TextMagic's
    # SMS gateway.
    #
    # This method always returns true.
    # In case the request to the SMS gateway is not successful or the server returns
    # an error response, an Error is raised.
    #
    # Example usage:
    #
    #  api.delete_reply("141421")
    #  api.delete_reply("173205", "223606")
    #  api.delete_reply(["244948", "264575"])
    def delete_reply(*ids)
      ids.flatten!
      raise TextMagic::API::Error.new(4, "Insufficient parameters") if ids.empty?
      Executor.execute("delete_reply", @username, @password, ids: ids.join(","))
      true
    end
    alias delete delete_reply

    # Executes a check_number command by sending a request to the TextMagic's
    # SMS gateway.
    #
    # If called with a single phone number, this method returns an OpenStruct instance
    # with credit price and country code for the given phone number. If called with
    # multiple phone numbers, the method returns a hash of such instances with phone
    # numbers as keys.
    # In case the request to the SMS gateway is not successful or the server returns
    # an error response, an Error is raised.
    #
    # Example usage:
    #
    #  check = api.check_number("447624800500")
    #  check.price
    #  # => 0.8
    #  check.country
    #  # => "GB"
    #
    # Example with multiple phone numbers:
    #
    #  check = api.check_number("447624800500", "61428102137")
    #  check["447624800500"].price
    #  # => 0.8
    #  check["61428102137"].country
    #  # => "AU"
    #
    # Multiple phone number can be supplied as an array or as a list of arguments:
    #
    #  api.check_number(["447624800500", "61428102137"])
    #  api.check_number("447624800500", "61428102137")
    #
    # If you want to check a single phone number but still want to get
    # a hash response, put the number in an array:
    #
    #  api.check_number(["447624800500"])
    def check_number(*phones)
      single = phones.size == 1 && phones.first.is_a?(String)
      phones.flatten!
      raise TextMagic::API::Error.new(4, "Insufficient parameters") if phones.empty?
      hash = Executor.execute("check_number", @username, @password, phone: phones.join(","))
      TextMagic::API::Response.check_number(hash, single)
    end
    alias check check_number

  end

end