module YSI
  class Engine
    attr_reader :assertions
    attr_reader :executor
    attr_writer :tag_date
    attr_accessor :version, :release_archive
    attr_accessor :out
    attr_accessor :data_dir

    def initialize
      @assertions = []
      @out = STDOUT
      @data_dir = File.expand_path("~/.ysi")
      self.dry_run = false
    end

    def dry_run=(dry_run)
      if dry_run
        @executor = DryExecutor.new
      else
        @executor = Executor.new
      end
    end

    def dry_run?
      @executor.is_a?(DryExecutor)
    end

    def read_config(yaml)
      config = YAML.load(yaml)
      parse(config)
    end

    def read(filename)
      config = YAML.load_file(filename)
      parse(config)
    end

    def parse(config)
      config.each do |key,value|
        if key == "include"
          included_file = value
          configs_path = File.expand_path("../../../configs", __FILE__)
          read(File.join(configs_path, included_file + ".conf"))
        elsif key == "assertions"
          assertions = value
          if assertions
            assertions.each do |assertion_name, parameters|
              if assertion_name == "version_number"
                out.puts "Warning: use `version` instead of `version_number`."
                out.puts
                assertion_name = "version"
              end

              assertion = YSI::Assertion.class_for_name(assertion_name).new(self)
              if parameters
                parameters.each do |parameter_name, parameter_value|
                  assertion.send(parameter_name + "=", parameter_value)
                end
              end
              @assertions << assertion
            end
          end
        end
      end
    end

    def check_assertion(assertion_class)
      assertion_class.new(self).check
    end

    def project_name
      File.basename(Dir.pwd)
    end

    def github_project_name
      if !@github_project_name
        origin = Git.new(Executor.new).origin
        @github_project_name = origin.match("git@github.com:(.*)")[1]
      end
      @github_project_name
    end

    def project_url
      "https://github.com/#{github_project_name}"
    end

    def release_url
      "https://github.com/#{github_project_name}/releases/tag/#{tag}"
    end

    def config_url
      "https://raw.githubusercontent.com/#{github_project_name}/master/yes_ship_it.conf"
    end

    def tag
      "v#{version}"
    end

    def tag_date
      @tag_date && @tag_date.utc
    end

    def release_archive_file_name
      File.basename(release_archive)
    end

    def dependency_errored?(assertion, errored_assertions)
      assertion.needs.each do |need|
        errored_assertions.each do |errored_assertion|
          if errored_assertion.class == need
            return true
          end
        end
      end
      false
    end

    def run
      failed_assertions = []
      errored_assertions = []
      skipped_assertions = []

      @assertions.each do |assertion|
        out.print "Checking #{assertion.display_name}: "
        if dependency_errored?(assertion, errored_assertions) ||
           dependency_errored?(assertion, skipped_assertions)
          out.puts "skip (because dependency errored)"
          skipped_assertions << assertion
          next
        end
        begin
          success = assertion.check
          if success
            out.puts success
          else
            out.puts "fail"
            failed_assertions.push(assertion)
          end
        rescue AssertionError => e
          out.puts "error"
          out.puts "  " + e.message
          errored_assertions.push(assertion)
        end
      end

      out.puts

      if !errored_assertions.empty?
        out.puts "Couldn't ship #{project_name}. Help me."
        return 1
      else
        if failed_assertions.empty?
          if tag_date
            out.puts "#{project_name} #{version} already shipped on #{tag_date}"
          else
            out.puts "#{project_name} #{version} already shipped"
          end
          return 0
        else
          failed_assertions.each do |assertion|
            if dry_run?
              out.print "Dry run: "
            end
            out.print "Asserting #{assertion.display_name}: "
            begin
              success = assertion.assert(executor)
            rescue AssertionError => e
              out.puts "error"
              out.puts "  " + e.message
              out.puts
              out.puts "Ran into an error. Stopping shipping."
              return 1
            end
            out.puts success
          end

          out.puts
          if dry_run?
            out.puts "Did a dry run of shipping #{project_name} #{version}." +
              " Nothing was changed."
          else
            out.puts "Shipped #{project_name} #{version}. Hooray!"
          end
          return 0
        end
      end
    end
  end
end