#!/usr/bin/env ruby

require 'bundler/setup'
require 'mkalias'
require 'usage'

VALID_OPTIONS = %w(new list show remove add_signal remove_signal).freeze

def usage
  puts Usage.header
  puts Usage.option_new
  puts Usage.option_list
  puts Usage.option_show
  puts Usage.option_remove
  puts Usage.option_signals
  puts Usage.attention
  abort
end

def new
  usage if ARGV.count < 3

  alias_name = ARGV[1]
  commands = ARGV[2..-1]
  result = Mkalias.new_alias(alias_name, commands)

  if result
    puts " - Created Alias: #{alias_name}"
    check_signal
  else
    puts " ERROR: O Alias [#{alias_name}] já existe"
  end
end

def list
  alias_names = Mkalias.list_alias

  puts 'Registered Alias:'
  alias_names.each do |alias_name|
    puts " - #{alias_name}"
  end
end

def check_alias_exists(alias_list, used_alias_names)
  alias_not_founded = alias_list - used_alias_names
  unless alias_not_founded.empty?
    alias_not_founded = alias_not_founded.join(', ')
    puts "Alias not founded: #{alias_not_founded}"
    puts ''
  end
end

def show
  alias_names = ARGV.count < 2 ? Mkalias.list_alias : ARGV[1..-1]
  commands = Mkalias.show_alias(alias_names)

  check_alias_exists(alias_names, commands.keys)

  unless commands.empty?
    commands.each do |alias_name, alias_commands|
      puts "-> #{alias_name}"
      alias_commands.each { |alias_command| puts " $ #{alias_command}" }
      puts ''
    end
  end
end

def remove
  usage if ARGV.count < 2

  alias_names = ARGV[1..-1]
  removed_alias = Mkalias.remove_alias(alias_names)

  check_alias_exists(alias_names, removed_alias)
  unless removed_alias.empty?
    puts 'Removed Alias:'
    removed_alias.each { |alias_name| puts "- #{alias_name}" }
    check_signal
  end
end

def add_signal
  result = Mkalias.add_signal

  if result
    puts "Add signal to call 'source ~/.bashrc'"
    puts " - Run '$ source ~/.bashrc' to update your bash"
  else
    puts 'The signal has already been added'
  end
end

def remove_signal
  result = Mkalias.remove_signal

  if result
    puts 'The signal was removed'
    puts " - Run '$ source ~/.bashrc' to update your bash"
  else
    puts 'The signal does not exist to be removed'
  end
end

def check_signal
  if Mkalias.signal?
    `kill -USR1 #{Process.ppid}`
  else
    puts " - Run '$ source ~/.bashrc' to use your alias"
  end
end

def main
  usage if ARGV.count == 0 || !VALID_OPTIONS.include?(ARGV[0])

  option = ARGV[0]
  send(option.to_s)
end

main