class GitParse

# File lib/git_team_stats/git_parse.rb, line 8
def initialize(directory)
  @commits = []

  @ignored_directories = []
  @start_date = nil
  @end_date = nil
  
  @directory = directory
end

# File lib/git_team_stats/git_parse.rb, line 59
def count_commits
  if @commits.empty?
    get_commits()
  end

  return @commits.count
end

# File lib/git_team_stats/git_parse.rb, line 19
def execute(command, directory = ".")
  directory = `cd #{directory}; #{command}`
end

# File lib/git_team_stats/git_parse.rb, line 67
def get_authors
  users = []
  get_authors_from_shortlog().lines.each do |line|
    if !users.any? {|user| user[:name] = line }
      users.push({
        :name => line.strip,
        :aliases => [line.strip]
      })
    end
  end
  return users
end

# File lib/git_team_stats/git_parse.rb, line 80
def get_authors_from_shortlog
  return execute("git shortlog -s | cut -c8-", @directory)
end

# File lib/git_team_stats/git_parse.rb, line 178
def get_commit_details

  puts "analyzing commits in #{@directory}".color(:yellow)
  
  bar = ProgressBar.new(@commits.length, :bar, :percentage, :eta);

  @commits.each { |commit|
    
    bar.increment!

    diff_tree = parse_diff_tree(commit[:hash])

    commit.merge!(diff_tree)
  }

  return @commits

end

# File lib/git_team_stats/git_parse.rb, line 24
def get_commits

  hash = ""

  puts "finding commits in #{@directory}".color(:yellow)
  rev_list = get_rev_list()
  bar = ProgressBar.new(rev_list.lines.length, :bar, :percentage, :eta);
  rev_list.lines.each do |line|
    bar.increment!
    if ( line =~ /^commit ([\w]+)/)
        hash = $1
        next
    else hash != ""
        if ( line =~ /^([\d]+)\s(.+)\s<(.+)>$/ )
            timestamp = $1.to_i
            committer = $2
            email = $3
        end
    
        @commits.push({
            :hash => hash,
            :committer => committer,
            :path => @directory,
            :timestamp => timestamp,
        })

        hash = ""
    end
  end

  return @commits
end

# File lib/git_team_stats/git_parse.rb, line 99
def get_diff_tree(commit_hash)
  return execute("git diff-tree %s --numstat" % commit_hash, @directory)
end

# File lib/git_team_stats/git_parse.rb, line 103
def get_file(commit_hash, file_name)
  return execute("git show %s:%s 2>&1" % [commit_hash, file_name], @directory)
end

# File lib/git_team_stats/git_parse.rb, line 84
def get_head_short_hash
  return execute("git rev-parse --short HEAD", @directory).strip
end

# File lib/git_team_stats/git_parse.rb, line 164
def get_language_for_file(file_name, commit_hash)
  escaped_file_name = file_name.gsub(/([\[\(\)\]\{\}\*\?\\])/, '\\\\\1')

  full_file_path = File.join(Dir.home, @directory.gsub(/^~/, ""), file_name)

  if File.file? full_file_path
    language = LanguageSniffer.detect(full_file_path).language;
  else 
    language = LanguageSniffer.detect(full_file_path, :content => get_file(commit_hash, escaped_file_name), :path => full_file_path).language;
  end

  return language
end

# File lib/git_team_stats/git_parse.rb, line 88
def get_rev_list
  date_str = ""
  if @start_date != nil
    date_str += "--max-age=%s " % [@start_date.to_i.to_s]
  end
  if @end_date != nil
    date_str += "--min-age=%s " % [@end_date.to_i.to_s]
  end
  return execute("git rev-list --reverse --pretty=format:\"%%at %%aN <%%aE>\" %s HEAD" % date_str, @directory)
end

# File lib/git_team_stats/git_parse.rb, line 107
def parse_diff_tree(commit_hash)

  total_lines = 0
  total_edits = 0
  file_types = {}

  diff_tree = get_diff_tree(commit_hash)

  diff_tree.lines.each do |line|
    
    if ( line =~ /^([\d]+)\s([\d]+)(.*[^\w](\w+))$/)

      insertions = $1.to_i
      deletions = $2.to_i

      lines = insertions - deletions
      edits = insertions + deletions

      file_name = $3.strip!

      extension = $4
      
      if (@ignored_directories.any?{ |obj| (file_name.index(obj) == 0) })
        next
      end
      
      language = get_language_for_file(file_name, commit_hash)

      if language == nil
        next
      end

      if (file_types.key? language.name.to_sym)
        file_types[language.name.to_sym][:lines] += lines
        file_types[language.name.to_sym][:edits] += edits
      else
        file_types[language.name.to_sym] = {
          :lines => lines,
          :edits => edits
        }
      end

      total_lines += lines
      total_edits += edits


    end
  end

  return {
      :lines => total_lines,
      :edits => total_edits,
      :file_types => file_types
  }

end