require 'rest-client'
require 'rest'
require 'json'
require 'time'

require_relative 'api_client_error'

module IronWorkerNG
  class APIClient
    AWS_US_EAST_HOST = 'worker-aws-us-east-1.iron.io'

    attr_accessor :token
    attr_accessor :project_id
    attr_accessor :scheme
    attr_accessor :host
    attr_accessor :port
    attr_accessor :api_version
    attr_accessor :user_agent

    attr_reader :options

    def initialize(options = {})
      load_from_hash(options)
      load_from_config(options[:config_file] || options['config_file'])
      load_from_config('iron.json')
      load_from_env('IRON_WORKER')
      load_from_env('IRON')
      load_from_config('~/.iron.json')
      load_from_hash(:scheme => 'https', :host => IronWorkerNG::APIClient::AWS_US_EAST_HOST, :port => 443, :api_version => 2, :user_agent => 'iron_worker_ng-' + IronWorkerNG.version)

      if (not @token) || (not @project_id)
        IronWorkerNG::Logger.error 'Both iron.io token and project_id must be specified' 
        raise 'Both iron.io token and project_id must be specified' 
      end

      @options = {
        :token => @token,
        :project_id => @project_id,

        :scheme => @scheme,
        :host => @host,
        :port => @port,
        :api_version => @api_version,
        :user_agent => @user_agent
      }

      @rest = Rest::Client.new
    end

    def load_from_hash(hash)
      return if hash.nil?

      @token ||= hash[:token] || hash['token']
      @project_id ||= hash[:project_id] || hash['project_id']

      @scheme ||= hash[:scheme] || hash['scheme']
      @host ||= hash[:host] || hash['host']
      @port ||= hash[:port] || hash['port']
      @api_version ||= hash[:api_version] || hash['api_version']
      @user_agent ||= hash[:user_agent] || hash['user_agent']
    end

    def load_from_env(prefix)
      @token ||= ENV[prefix + '_TOKEN']
      @project_id ||= ENV[prefix + '_PROJECT_ID']

      @scheme ||= ENV[prefix + '_SCHEME']
      @host ||= ENV[prefix + '_HOST']
      @port ||= ENV[prefix + '_PORT']
      @api_version ||= ENV[prefix + '_API_VERSION']
      @user_agent ||= ENV[prefix + '_USER_AGENT']
    end

    def load_from_config(config_file)
      return if config_file.nil?

      if File.exists?(File.expand_path(config_file))
        config = JSON.load(File.read(File.expand_path(config_file)))

        load_from_hash(config['iron_worker'])
        load_from_hash(config['iron'])
        load_from_hash(config)
      end
    end

    def common_request_hash
      {
        'Content-Type' => 'application/json',
        'Authorization' => "OAuth #{@token}",
        'User-Agent' => @user_agent
      }
    end

    def url
      "#{scheme}://#{host}:#{port}/#{api_version}/"
    end

    def get(method, params = {})
      request_hash = {}
      request_hash[:headers] = common_request_hash
      request_hash[:params] = params

      IronWorkerNG::Logger.debug "GET #{url + method} with params='#{request_hash.to_s}'"

      @rest.get(url + method, request_hash)
    end

    def post(method, params = {})
      request_hash = {}
      request_hash[:headers] = common_request_hash
      request_hash[:body] = params.to_json

      IronWorkerNG::Logger.debug "POST #{url + method} with params='#{request_hash.to_s}'" 

      @rest.post(url + method, request_hash)
    end

    def delete(method, params = {})
      request_hash = {}
      request_hash[:headers] = common_request_hash
      request_hash[:params] = params

      IronWorkerNG::Logger.debug "DELETE #{url + method} with params='#{request_hash.to_s}'"

      @rest.delete(url + method, request_hash)
    end

    # FIXME: retries support
    # FIXME: user agent support
    def post_file(method, file, params = {})
      request_hash = {}
      request_hash[:data] = params.to_json
      request_hash[:file] = file

      IronWorkerNG::Logger.debug "POST #{url + method + "?oauth=" + @token} with params='#{request_hash.to_s}'"

      RestClient.post(url + method + "?oauth=#{@token}", request_hash) 
    end

    def parse_response(response, parse_json = true)
      IronWorkerNG::Logger.debug "GOT #{response.code} with params='#{response.body}'"

      raise IronWorkerNG::APIClientError.new(response.body) if response.code != 200

      return response.body unless parse_json
      JSON.parse(response.body)
    end

    def codes_list(options = {})
      parse_response(get("projects/#{@project_id}/codes", options))
    end

    def codes_get(id)
      parse_response(get("projects/#{@project_id}/codes/#{id}"))
    end

    def codes_create(name, file, runtime, runner)
      parse_response(post_file("projects/#{@project_id}/codes", File.new(file, 'rb'), {:name => name, :runtime => runtime, :file_name => runner}))
    end

    def codes_delete(id)
      parse_response(delete("projects/#{@project_id}/codes/#{id}"))
    end

    def codes_revisions(id, options = {})
      parse_response(get("projects/#{@project_id}/codes/#{id}/revisions", options))
    end

    def codes_download(id, options = {})
      parse_response(get("projects/#{@project_id}/codes/#{id}/download", options), false)
    end

    def tasks_list(options = {})
      parse_response(get("projects/#{@project_id}/tasks", options))
    end

    def tasks_get(id)
      parse_response(get("projects/#{@project_id}/tasks/#{id}"))
    end

    def tasks_create(code_name, payload, options = {})
      parse_response(post("projects/#{@project_id}/tasks", {:tasks => [{:code_name => code_name, :payload => payload}.merge(options)]}))
    end

    def tasks_cancel(id)
      parse_response(post("projects/#{@project_id}/tasks/#{id}/cancel"))
    end

    def tasks_cancel_all(code_id)
      parse_response(post("projects/#{@project_id}/codes/#{code_id}/cancel_all"))
    end

    def tasks_log(id)
      parse_response(get("projects/#{@project_id}/tasks/#{id}/log"), false)
    end

    def tasks_set_progress(id, options = {})
      parse_response(post("projects/#{@project_id}/tasks/#{id}/progress", options))
    end

    def schedules_list(options = {})
      parse_response(get("projects/#{@project_id}/schedules", options))
    end

    def schedules_get(id)
      parse_response(get("projects/#{@project_id}/schedules/#{id}"))
    end

    def schedules_create(code_name, payload, options = {})
      options[:start_at] = options[:start_at].iso8601 if (not options[:start_at].nil?) && options[:start_at].class == Time
      options[:end_at] = options[:end_at].iso8601 if (not options[:end_at].nil?) && options[:end_at].class == Time

      parse_response(post("projects/#{@project_id}/schedules", {:schedules => [{:code_name => code_name, :payload => payload}.merge(options)]}))
    end

    def schedules_cancel(id)
      parse_response(post("projects/#{@project_id}/schedules/#{id}/cancel"))
    end
  end
end