##
# Provides an interface to the git commits related to a specific ticket
class GitTicket
  attr_reader :ticket
  attr_accessor :git_command

  ##
  # Creates a new diff from all commits referencing a given ticket.
  #
  # @param [String] ticket_reference The ticket reference to use
  # @param [String] diff_target The git reference to diff against.
  def initialize(ticket_reference)
    @ticket = ticket_reference
    @git_command = "git -c color.ui=always" # So our output is colourised
  end

  ##
  # Sets and returns the commit messages for each commit
  # @return [Array<String>] The commit messages
  def commit_messages
    return @commit_messages if @commit_messages

    @commit_messages = []
    shas.each do |sha|
      message, _status = Open3.capture2("#{git_command} show #{sha} -s")
      @commit_messages.push(message)
    end

    @commit_messages
  end

  ##
  # Sets and returns the patches for each commit.
  #
  # @return [Array<String>] The diffs
  def patches
    return @patches if @patches

    @patches = []
    shas.each do |sha|
      patch, _status = Open3.capture2("#{git_command} show #{sha} --patch")
      @patches.push(patch)
    end

    @patches
  end
  ##

  # Sets and returns the commit SHAs referenced.
  #
  # @return [Array<String>] The commit SHAs
  def shas
    return @shas if @shas

    @shas, _status = Open3.capture2("#{git_command} log --all --grep #{@ticket} --format=%H")
    @shas = @shas.split("\n")
  end
end