module Git

  # object that holds the last X commits on given branch
  class Log
    include Enumerable

    def initialize(base, count = 30)
      dirty_log
      @base = base
      @count = count
    end

    def all
      dirty_log
      @all = true
      self
    end

    def object(objectish)
      dirty_log
      @object = objectish
      return self
    end

    def author(regex)
      dirty_log
      @author = regex
      return self
    end

    def grep(regex)
      dirty_log
      @grep = regex
      return self
    end

    def path(path)
      dirty_log
      @path = path
      return self
    end

    def skip(num)
      dirty_log
      @skip = num
      return self
    end

    def since(date)
      dirty_log
      @since = date
      return self
    end

    def until(date)
      dirty_log
      @until = date
      return self
    end

    def between(sha1, sha2 = nil)
      dirty_log
      @between = [sha1, sha2]
      return self
    end

    def cherry
      dirty_log
      @cherry = true
      return self
    end

    def to_s
      self.map { |c| c.to_s }.join("\n")
    end


    # forces git log to run

    def size
      check_log
      @commits.size rescue nil
    end

    def each(&block)
      check_log
      @commits.each(&block)
    end

    def first
      check_log
      @commits.first rescue nil
    end

    def last
      check_log
      @commits.last rescue nil
    end

    def [](index)
      check_log
      @commits[index] rescue nil
    end


    private

      def dirty_log
        @dirty_flag = true
      end

      def check_log
        if @dirty_flag
          run_log
          @dirty_flag = false
        end
      end

      # actually run the 'git log' command
      def run_log
        log = @base.lib.full_log_commits(
          count: @count, all: @all, object: @object, path_limiter: @path, since: @since,
          author: @author, grep: @grep, skip: @skip, until: @until, between: @between,
          cherry: @cherry
        )
        @commits = log.map { |c| Git::Object::Commit.new(@base, c['sha'], c) }
      end

  end

end