namespace :git do

  def strategy
    @strategy ||= Capistrano::Git.new(self, fetch(:git_strategy, Capistrano::Git::DefaultStrategy))
  end

  set :git_environmental_variables, ->() {
    {
      git_askpass: "/bin/echo",
      git_ssh:     "#{fetch(:tmp_dir)}/#{fetch(:application)}/git-ssh.sh"
    }
  }

  desc 'Upload the git wrapper script, this script guarantees that we can script git without getting an interactive prompt'
  task :wrapper do
    on release_roles :all do
      execute :mkdir, "-p", "#{fetch(:tmp_dir)}/#{fetch(:application)}/"
      upload! StringIO.new("#!/bin/sh -e\nexec /usr/bin/ssh -o PasswordAuthentication=no -o StrictHostKeyChecking=no \"$@\"\n"), "#{fetch(:tmp_dir)}/#{fetch(:application)}/git-ssh.sh"
      execute :chmod, "+x", "#{fetch(:tmp_dir)}/#{fetch(:application)}/git-ssh.sh"
    end
  end

  desc 'Check that the repository is reachable'
  task check: :'git:wrapper' do
    fetch(:branch)
    on release_roles :all do
      with fetch(:git_environmental_variables) do
        exit 1 unless strategy.check
      end
    end
  end

  desc 'Clone the repo to the cache'
  task clone: :'git:wrapper' do
    on release_roles :all do
      if strategy.test
        info t(:mirror_exists, at: repo_path)
      else
        within deploy_path do
          with fetch(:git_environmental_variables) do
            strategy.clone
          end
        end
      end
    end
  end

  desc 'Update the repo mirror to reflect the origin state'
  task update: :'git:clone' do
    on release_roles :all do
      within repo_path do
        with fetch(:git_environmental_variables) do
          strategy.update
        end
      end
    end
  end

  desc 'Copy repo to releases'
  task create_release: :'git:update' do
    on release_roles :all do
      with fetch(:git_environmental_variables) do
        within repo_path do
          execute :mkdir, '-p', release_path
          strategy.release
        end
      end
    end
  end

  desc 'Determine the revision that will be deployed'
  task :set_current_revision do
    on release_roles :all do
      within repo_path do
        with fetch(:git_environmental_variables) do
          set :current_revision, strategy.fetch_revision
        end
      end
    end
  end
end