# Git Pivotal Tracker Integration
# Copyright (c) 2013 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

module GitPivotalTrackerIntegration
  module Command

    # The class that encapsulates starting a Pivotal Tracker Story
    class Start < Base

      # Starts a Pivotal Tracker story by doing the following steps:
      # * Create a branch
      # * Add default commit hook
      # * Start the story on Pivotal Tracker
      #
      # @param [String, nil] filter a filter for selecting the story to start.  This
      #   filter can be either:
      #   * a story id
      #   * a story type (feature, bug, chore)
      #   * +nil+
      # @return [void]
      def run(args)
        filter = args[0]
        $LOG.debug("#{self.class} in project:#{@project.name} pwd:#{pwd} branch:#{Util::Git.branch_name} args:#{filter}")
        self.check_branch
        story = nil
        if (!args.nil? && args.any?{|arg| arg.include?("-n")})
          story = self.create_story(args)
        else
          story = Util::Story.select_story @project, filter
        end

        abort "There are no available stories." if story.nil?

        if story.story_type == "feature" && story.estimate.to_i < 0
          story.estimate = estimate_story
          story.save
        end

        $LOG.debug("story:#{story.name}")
        Util::Story.pretty_print story

        Util::Git.create_branch feature_branch(story)
        @configuration.story = story
        Util::Git.add_hook 'prepare-commit-msg', File.join(File.dirname(__FILE__), !OS.windows? ? 'prepare-commit-msg.sh' : 'prepare-commit-msg-win.sh' )

        start_on_tracker story
      end

      def check_branch
        current_branch = Util::Git.branch_name
        # suggested_branch = (Util::Shell.exec "git config --get git-pivotal-tracker-integration.feature-root 2>/dev/null", false).chomp
        suggested_branch = 'develop'

        if !suggested_branch.nil? && suggested_branch.length !=0 && current_branch != suggested_branch
          $LOG.warn("Currently checked out branch is '#{current_branch}'.")
          should_change_branch = ask("Your currently checked out branch is '#{current_branch}'. Do you want to checkout '#{suggested_branch}' before starting?(Y/n)")
          if should_change_branch != "n"
            $LOG.debug("Checking out branch '#{suggested_branch}'")
            print "Checking out branch '#{suggested_branch}'...\n\n"
            $LOG.debug(Util::Shell.exec "git checkout --quiet #{suggested_branch}")
          end
        end
      end

      private

      def feature_branch(story)
        prefix = "#{story.id}-"
        story_name = "#{story.name.gsub(/[^0-9a-z\\s]/i, '_')}"
        if(story_name.length > 30)
          suggested_suffix = story_name[0..27]
          suggested_suffix << "__"
        else
          suggested_suffix = story_name
        end
        branch_name = ask("Enter branch name (#{story.id}-<#{suggested_suffix}>): ")
        branch_name = branch_name.empty? ? "#{prefix}#{suggested_suffix}" : "#{prefix}#{branch_name}"
        branch_name.gsub(/[^0-9a-z\\s\-]/i, '_')
      end

      def start_on_tracker(story)
        print 'Starting story on Pivotal Tracker... '
        story.attributes = {
            :current_state   => 'started',
            :owner_ids        => [@client.me.id],
        }
        story.save
        puts 'OK'
      end

    end

  end
end