require 'uri'
module Mirage
  class Client
    Defaults = Struct.new(:method, :status, :delay, :content_type, :default)
    include Mirage::Web
    attr_reader :url


    # Creates an instance of the Mirage client that can be used to interact with the Mirage Server
    #
    #   Client.new => a client that is configured to connect to Mirage on http://localhost:7001/mirage (the default settings for Mirage)
    #   Client.new(URL) => a client that is configured to connect to an instance of Mirage running on the specified url.
    #
    #   a block can be passed to configure the client with defaults: see configure
    def initialize url="http://localhost:7001/mirage", &block
      @url = url
      reset
      configure &block if block_given?
    end


    # Configures default settings to be applied to all response templates put on to Mirage
    #
    #   Example:
    #   Client.new.configure do
    #     defaults.method = :post
    #     defaults.status = 202
    #     defaults.default = true
    #     defaults.delay = 2
    #     defaults.content_type = "text/xml"
    #   end
    def configure &block
      yield @defaults
    end

    # Remove any defaults applied to this client
    def reset
      @defaults = Defaults.new
    end

    def stop
      Mirage.stop :port => URI.parse(@url).port
    end


    # Set a text or file based response template, to be hosted at a given end point. A block can be specified to configure the template
    # client.set(endpoint, response, &block) => unique id that can be used to call back to the server
    #
    # Examples:
    # client.put('greeting', 'hello')
    #
    # client.put('greeting', 'hello') do |response|
    #   response.pattern = 'pattern' #regex or string literal applied against the request querystring and body
    #   response.method = :post #By default templates will respond to get requests
    #   response.content_type = 'text/html' #defaults text/plain
    #   response.default = true # defaults to false. setting to true will allow this template to respond to request made to sub resources should it match.
    # end
    def put endpoint, response_value, &block
      response = Mirage::Response.new response_value
      @defaults.each_pair{|key, value|response.send("#{key}=", value) if value}
      yield response if block_given?

      build_response(http_put("#{@url}/templates/#{endpoint}", response.value, response.headers))
    end

    # Use to look to preview the content of a response template would return to a client without actually triggering.
    # client.response(response_id) => response held on the server as a String
    def response response_id
      response = build_response(http_get("#{@url}/templates/#{response_id}"))
      case response
        when String then
          return response
        when Mirage::Web::FileResponse then
          return response.response.body
      end

    end

    # Clear Content from Mirage
    #
    # If a response id is not valid, a ResponseNotFound exception will be thrown
    #
    # Example Usage:
    #   client.clear -> clear all responses and associated requests
    #   client.clear(response_id) -> Clear the response and tracked request for a given response id
    #   client.clear(:requests) -> Clear all tracked request information
    #   client.clear(:request => response_id) -> Clear the tracked request for a given response id
    def clear thing=nil

      case thing
        when :requests
          http_delete("#{@url}/requests")
        when Numeric then
          http_delete("#{@url}/templates/#{thing}")
        when Hash then
          puts "deleteing request #{thing[:request]}"
          http_delete("#{@url}/requests/#{thing[:request]}") if thing[:request]
        else
          NilClass
          http_delete("#{@url}/templates")
      end

    end


    # Retrieve the last request that triggered a response to be returned. If the request contained content in its body, this is returned. If the
    # request did not have any content in its body then what ever was in the request query string is returned instead
    #
    # Example Usage
    #   client.request(response_id) -> Tracked request as a String
    def request response_id
      build_response(http_get("#{@url}/requests/#{response_id}"))
    end

    # Save the state of the Mirage server so that it can be reverted back to that exact state at a later time.
    def save
      http_put("#{@url}/backup", '').code == 200
    end


    # Revert the state of Mirage back to the state that was last saved
    # If there is no snapshot to rollback to, nothing happens
    def revert
      http_put(@url, '').code == 200
    end


    # Check to see if mirage is running on the url that the client is pointing to
    def running?
      Mirage.running?(@url)
    end

    # Clear down the Mirage Server and load any defaults that are in Mirages default responses directory.
    def prime
      build_response(http_put("#{@url}/defaults", ''))
    end

    private
    def build_response response
      case response.code.to_i
        when 500 then
          raise ::Mirage::InternalServerException.new(response.body, response.code.to_i)
        when 404 then
          raise ::Mirage::ResponseNotFound.new(response.body, response.code.to_i)
        else
          response.body
      end
    end
  end
end