module GitTimer

# File lib/git_timer.rb, line 73
def current_branch_and_ticket_id
  list_of_branches = `git branch`.split("\n")
  current_branch = list_of_branches.find { |string| string.match(/^\* /) }.sub('* ', '')
  ticket_id = current_branch.match(/^([^_]*)_?/)
  ticket_id = ticket_id.captures.first if ticket_id != nil
  [current_branch, ticket_id]
end

# File lib/git_timer.rb, line 81
def failed_push?(ticket_id)
  last_entry = `tail -n 1 #{MAIN_PATH}`
  return false if last_entry == LOG_TITLE
  last_entry = last_entry.match(/^(\w*) \| (\w*[ ]?\w*) \| (.*)/).captures
  time_diff = (Time.now - Time.parse(last_entry[2])) / 60
  last_entry[0] == ticket_id && last_entry[1] == 'Code review' && time_diff < 11
end

# File lib/git_timer.rb, line 24
def initialize_git_hook(hook_path, hook_method)
  content =
  "#!/usr/bin/env ruby

  require 'git_timer'

  GitTimer.#{hook_method}
  "
  File.open(hook_path, 'w+') do |f|
    f.write content
  end
  FileUtils.chmod('+x', hook_path)
end

# File lib/git_timer.rb, line 66
def is_new_branch?(current_branch, previous_head, new_head)
  # if the refs of the previous and new heads are the same
  # and the number of checkouts equals one, a new branch has been created
  num_checkouts = `git reflog --date=local | grep -o #{current_branch} | wc -l`.strip.to_i
  previous_head == new_head && num_checkouts == 1
end

# File lib/git_timer.rb, line 13
def main
  unless File.exist?(MAIN_PATH)
    File.open(MAIN_PATH, 'w+') do |f|
      f.write LOG_TITLE
    end
    File.chmod(0777, MAIN_PATH)
  end
  initialize_git_hook(POST_CHECKOUT_PATH, 'post_checkout') unless File.exist?(POST_CHECKOUT_PATH)
  initialize_git_hook(PRE_PUSH_PATH, 'pre_push') unless File.exist?(PRE_PUSH_PATH)
end

# File lib/git_timer.rb, line 38
def post_checkout
  current_branch, ticket_id = current_branch_and_ticket_id
  previous_head = ARGV[0]
  new_head = ARGV[1]
  is_file_checkout = ARGV[2] == '0'
  if is_file_checkout
    puts 'This is a file checkout. Nothing to do.'
    exit 0
  end
  if is_new_branch?(current_branch, previous_head, new_head)
    register_activity({ ticket_id: ticket_id, ticket_state: 'In progress' })
  end
end

# File lib/git_timer.rb, line 52
def pre_push
  _, ticket_id = current_branch_and_ticket_id
  if failed_push?(ticket_id)
    new_lines = File.readlines(MAIN_PATH)
    new_lines.pop
    File.open(MAIN_PATH, 'w') do |f|
      new_lines.each do |line|
        f.write line
      end
    end
  end
  register_activity({ ticket_id: ticket_id, ticket_state: 'Code review' })
end

# File lib/git_timer.rb, line 89
def register_activity(ticket_info)
  ticket_id = ticket_info[:ticket_id]
  ticket_state = ticket_info[:ticket_state]
  File.open(MAIN_PATH, 'a') do |f|
    f.puts "#{ticket_id} | #{ticket_state} | #{Time.now}"
  end
end