class Git::Diff

# File lib/git/diff.rb, line 11
def initialize(base, from = nil, to = nil)
  @base = base
  @from = from&.to_s
  @to = to&.to_s

  @path = nil
  @full_diff_files = nil
end

# File lib/git/diff.rb, line 61
def [](key)
  process_full
  @full_diff_files.assoc(key)[1]
end

# File lib/git/diff.rb, line 87
def deletions
  stats_provider.deletions
end

# File lib/git/diff.rb, line 66
def each(&)
  process_full
  @full_diff_files.map { |file| file[1] }.each(&)
end

# File lib/git/diff.rb, line 91
def insertions
  stats_provider.insertions
end

# File lib/git/diff.rb, line 83
def lines
  stats_provider.lines
end

# File lib/git/diff.rb, line 79
def name_status
  path_status_provider.to_h
end

# File lib/git/diff.rb, line 56
def patch
  @base.lib.diff_full(@from, @to, { path_limiter: @path })
end

# File lib/git/diff.rb, line 40
def path(*paths)
  validate_paths_not_arrays(paths)

  cleaned_paths = paths.compact

  @path = if cleaned_paths.empty?
            nil
          elsif cleaned_paths.length == 1
            cleaned_paths.first
          else
            cleaned_paths
          end

  self
end

# File lib/git/diff.rb, line 71
def size
  stats_provider.total[:files]
end

# File lib/git/diff.rb, line 95
def stats
  {
    files: stats_provider.files,
    total: stats_provider.total
  }
end

# File lib/git/diff.rb, line 149
def path_status_provider
  @path_status_provider ||= Git::DiffPathStatus.new(@base, @from, @to, @path)
end

# File lib/git/diff.rb, line 143
def process_full
  return if @full_diff_files

  @full_diff_files = process_full_diff
end

# File lib/git/diff.rb, line 157
def process_full_diff
  FullDiffParser.new(@base, patch).parse
end

# File lib/git/diff.rb, line 153
def stats_provider
  @stats_provider ||= Git::DiffStats.new(@base, @from, @to, @path)
end

# File lib/git/diff.rb, line 135
def validate_paths_not_arrays(paths)
  return unless paths.any?(Array)

  raise ArgumentError,
        'path expects individual arguments, not arrays. ' \
        "Use path('lib/', 'docs/') not path(['lib/', 'docs/'])"
end