#!/usr/bin/env ruby

require 'thor'
require 'colorize'
require 'pathname'

class GitHookInstall < Thor
  include Thor::Actions

  def self.exit_on_failure?
    true
  end

  def self.source_root
    File.join(File.dirname(__FILE__),"..", "lib", "captain_hoog", "templates")
  end

  class_option :type, type: :string, default: 'pre-commit'
  class_option :project_dir, type: :string, default: Dir.getwd
  class_option :plugins_dir, type: :string, default: Dir.getwd

  map %w[--version -v] => :__print_version

  desc "install","Installs the hook into your Git repository"
  def install(*args)
    check_if_git_present
    check_if_option_present("plugins_dir")
    # deprecated:
    # "#{options[:plugins_dir]}/#{options[:type]}"
    install_hook({ as: options[:type],
                   context: {
                     root_dir: Dir.getwd,
                     plugins_dir: options[:plugins_dir],
                     project_dir: options[:project_dir]
                   }
                })
    puts "Installed hook as #{options[:type]} hook".green
  end

  desc "remove", "Removes a hook from your Git repository"
  def remove(*args)
    check_if_git_present
    remove_hook(as: options[:type])
    puts "The #{options[:type]} hook is removed.".green
  end

  option :from, type: :string, required: true
  option :to, type: :string, required: true
  desc "move", "Moves a hook from type to another"
  def move(*args)
    check_if_git_present
    if options[:from] == options[:to]
      puts "--from and --to arguments are the same".red
      raise Thor::Error
    else
      move_hook(options)
      puts "The #{options[:from]} hook is moved to #{options[:to]} hook.".green
    end
  end
  
  desc "version, -v", "Prints out the version"
  def __print_version 
    puts CaptainHoog::VERSION
  end

  private

  def is_git_repository?
   File.exists?(File.join(Dir.getwd, ".git"))
 end

  def install_hook(config)
    opts        = config[:context]
    opts[:type] = config[:as]
    copy_config_file(opts)
    template("install.erb",File.join(hooks_dir, config[:as]), opts)
    FileUtils.chmod(0755,File.join(hooks_dir, config[:as]))
  end

  def remove_hook(config)
    FileUtils.rm_rf(File.join(hooks_dir, config[:as]))
  end

  def move_hook(config)
    from = File.join(hooks_dir, config[:from])
    to   = File.join(hooks_dir, config[:to])
    FileUtils.mv(from, to)
  end

  def hooks_dir
    git_dir.join(".git", "hooks")
  end

  def git_dir
    Pathname.new(Dir.getwd)
  end

  def check_if_git_present
    if not is_git_repository?
      puts "I can't detect a Git repository".red
      raise Thor::Error
    end
  end

  def check_if_option_present(type)
    unless options.has_key?(type)
      puts "No value provided for required options '--#{type}'".red
      raise Thor::Error
    end
  end

  def copy_config_file(opts={})
    template('hoogfile.erb', git_dir.join('hoogfile.yml'), opts)
  end

end

GitHookInstall.start(ARGV)