class GitManager

# File lib/git_undo/git_manager.rb, line 2
def initialize(history_file)
  @history_file = history_file
  @command_list = []
end

# File lib/git_undo/git_manager.rb, line 17
def get_commands
  File.open(@history_file) do |file|
    file.each do |line|
      # find all git commands
      if /\Agit / =~ line
        @command_list << line.chomp
      end
    end
  end
end

# File lib/git_undo/git_manager.rb, line 28
def last_command
  @command_list.reverse.detect do |raw_command|
    command = parse_command(raw_command)[:action]
    GitReverser::VALID_COMMANDS.include?(command)
  end
end

# File lib/git_undo/git_manager.rb, line 35
def parse_command(command)
  tokens = command.split(' ')
  action = tokens[1]
  arguments = tokens[2..-1].join(' ')
  return { action: action, arguments: arguments }
end

# File lib/git_undo/git_manager.rb, line 7
def run
  get_commands
  if last_command
    puts "Last git command was: `#{last_command}`"
    undo_message(last_command)
  else
    puts "No git commands found!"
  end
end

# File lib/git_undo/git_manager.rb, line 42
def undo_command(action, arguments)
  reverser = GitReverser.new(arguments)

  case action
  when 'add'
    reverser.reverse_add
  when 'commit'
    reverser.reverse_commit
  when 'merge'
    reverser.reverse_merge
  when 'checkout','co'
    reverser.reverse_checkout
  when 'rebase'
    reverser.reverse_rebase
  end
end

# File lib/git_undo/git_manager.rb, line 59
def undo_message(command)
  command_hash = parse_command(command)
  undo = undo_command(command_hash[:action], command_hash[:arguments])
  if !undo
    puts "Sorry, I don't know how to undo that command"
  else
    puts "To undo, run `#{undo}`\nWould you like to automatically run this command now? (y/N)"
    option = gets.chomp.downcase
    if option == 'y'
      puts undo
      %x[ #{undo} ]
    end
  end
end