require 'rake'
require 'fileutils'
require 'rspec/core/rake_task'
 
module Henry
  
  class Task
    
    # The Henry Task implementation for Rspec
    class RspecTask < Task

      # The temporary output file path for the RspecTask execution.
      OUT_PATH = 'rspec.out'

      # The reports path template.
      REPORTS_DIR = '.henry/reports/${FORMAT}'
      
      # Executes the Task and returns its results.
      def execute
        begin
          Rake.application['spec'].invoke 
 
          self.execution.code = 'OK'
          self.execution.message = 'OK'
          self.execution.output = File.open(OUT_PATH, 'r').read
          self.execution.log = self.logger.log_as_hash
        rescue Exception => e
          self.execution.code = 'ERROR'
          self.execution.message = 'ERROR'
          self.execution.output = File.open(OUT_PATH, 'r').read
          self.execution.backtrace = e.message
          self.execution.log = self.logger.log_as_hash
        end
      end

      # Configures the Task.
      #
      # @param [Hash] params the task params.
      # @param [Hash] extended_context the task extended context.
      def configure(params, extended_context)
        File.open(OUT_PATH, 'w') { |f| }

        # Makes available the spec rake task.
        RSpec::Core::RakeTask.new do |t|
          if self.data.options
            t.pattern = self.data.options['pattern'] || 'spec/*'
            t.rspec_opts = "#{self.custom_options} #{extended_context['options']}"
          else
            t.pattern = 'spec/*'
            t.rspec_opts = "#{self.default_options} #{extended_context['options']}"
          end
        end

        self.export_params(params)
      end

    protected

      # Returns the custom rspec_opts that user may have passed.
      #
      # @return [String]
      def custom_options
        "#{self.format_options} #{self.tags_options} #{self.report_options}" 
      end

      # Returns the default rspec_opts.
      #
      # @return [String]
      def default_options
        "--color --format documentation --format documentation --out #{OUT_PATH}"
      end

      # Returns the rspec_opts related with formatting.
      #
      # @return [String]
      def format_options
        "--color --format #{self.data.options['format'] || 'documentation'} --format #{self.data.options['format'] || 'documentation'} --out #{OUT_PATH}"
      end
      
      # Returns the rspec_opts related with tags to be run.
      #
      # @return [String]
      def tags_options
        return '' if self.data.options['tags'].nil?

        self.data.options['tags'].collect do |tag|
          "--tag #{tag}"
        end.join(' ')
      end

      # Returns the rspec_opts related with report paaths and formats.
      #
      # @return [String]
      def report_options
        return '' if self.data.reports.nil?

        self.data.reports.collect do |report_options|
          FileUtils.mkdir_p(self.reports_dir(report_options['format']))
          "--format #{report_options['format']} --out #{self.report_file_path(report_options['format'], report_options['name'])}"
        end.join(' ')
      end

      # Returns the report file path for the given format and file name.
      #
      # @param [String] format the rspec formatter name.
      # @param [String] file_name the report file name template.
      # @return [String] the report file path.
      def report_file_path(format, file_name)
        "#{self.reports_dir(format)}/#{self.report_file_name(file_name)}"
      end

      # Interpolates and returns the report file name.
      #
      # @param [String] file_name the report file name.
      # @returns [String] the report file name.
      def report_file_name(file_name)
        file_name.gsub(/\${[A-Z_]+}/, '${TASK_NAME}' => self.name, '${DATE}' => DateTime.now.to_s).gsub(' ', '_')
      end

      # Interpolates and returns the reports directory for the given format.
      #
      # @param [String] format the formatter name.
      # @return [Stiring] the reports directory.
      def reports_dir(format)
        REPORTS_DIR.gsub(/\${[A-Z_]+}/, '${FORMAT}' => format).gsub(' ', '_')
      end

    end

  end

end