# -*- encoding : utf-8 -*-
require 'git_stats/hash_initializable'

module GitStats
  module GitData
    class Commit
      include HashInitializable

      attr_reader :repo, :sha, :stamp, :date, :author

      def files
        @files ||= repo.run_and_parse("git ls-tree -r #{self.sha} -- #{repo.tree_path}").map do |file|
          Blob.new(repo: repo, filename: file[:filename], sha: file[:sha])
        end.extend(ByFieldFinder)
      end

      def binary_files
        @binary_files ||= files.select { |f| f.binary? }
      end

      def text_files
        @text_files ||= files - binary_files
      end

      def files_by_extension
        @files_by_extension ||= files.inject({}) { |acc, f| acc[f.extension] ||= []; acc[f.extension] << f; acc }
      end

      def files_by_extension_count
        @files_by_extension_count ||= Hash[files_by_extension.map { |ext, files| [ext, files.count] }]
      end

      def lines_by_extension
        @lines_by_extension ||= Hash[files_by_extension.map { |ext, files|
          [ext, files.map(&:lines_count).sum]
        }.delete_if { |ext, lines_count| lines_count == 0 }]
      end

      def files_count
        @files_count ||= repo.run("git ls-tree -r --name-only #{self.sha} -- #{repo.tree_path}| wc -l").to_i
      end

      def lines_count
        @lines_count ||= repo.run("git diff --shortstat `git hash-object -t tree /dev/null` #{self.sha} -- #{repo.tree_path}").lines.map do |line|
          line[/(\d+) insertions?/, 1].to_i
        end.sum
      end

      def short_stat
        @short_stat ||= ShortStat.new(self)
      end

      def to_s
        "#{self.class} #@sha"
      end

      def ==(other)
        [self.repo, self.sha, self.stamp, self.date, self.author] ==
            [other.repo, other.sha, other.stamp, other.date, other.author]
      end
    end
  end
end