gistfile1.txt

require 'colorize'
require 'mixlib/shellout'
require_relative 'cli'

module Farm
  class Migrator
    def initialize(envs)
      @envs = envs
      run
    end

    def run
      fail "The 'migrate' option requires 2 arguments.".red if ARGV[1].nil? || ARGV[2].nil?
      fail 'One of the provided environments is invalid.'.red unless @envs.include?(ARGV[1]) && @envs.include?(ARGV[2])

      new_files?(ARGV[1], ARGV[2])
      compare_files(ARGV[1], ARGV[2])
    end

    def compare_files(src, dst)
      Dir.glob("env.#{src}/*.tf").each do |file|
        file = file.split('/')[1]
        next unless File.exist?("env.#{dst}/#{file}")
        next if file == 'env.tf'

        f1 = parse("env.#{src}/#{file}")
        f2 = parse("env.#{dst}/#{file}")

        # returns true if there's no differences (diff returns 0)
        next if system("diff env.#{src}/#{file} env.#{dst}/#{file} > /dev/null")

        File.open("env.#{dst}/#{file}", "w+") do |f|
          f1.concat(f2).uniq.each { |e| f.puts(e) }
        end

        puts "The content of 'env.#{src}/#{file}' and 'env.#{dst}/#{file}' has been merged.".light_blue
      end
    end

    def copy_files(files, src, dst)
      files.each do |file|
        FileUtils.cp("env.#{src}/#{file}", "env.#{dst}/#{file}", :verbose => true)
      end
    end

    def new_files?(src, dst) # rubocop:disable Metrics/MethodLength
      src_files = []
      Dir.glob("env.#{src}/*").each do |e|
        src_files << e.split('/')[1]
      end

      dst_files = []
      Dir.glob("env.#{dst}/*").each do |e|
        dst_files << e.split('/')[1]
      end

      diff = src_files - dst_files
      return false if diff.empty?

      puts "The following files are present in 'env.#{src}' and missing in 'env.#{dst}': #{diff}".yellow
      print 'Do you want to copy the missing files? (yes/no): '.light_blue
      a = $stdin.gets.chomp
      a == 'yes' ? copy_files(diff, src, dst) : fail('Aborting.')
    end

    def parse(file)
      data = []
      File.foreach(file).slice_after(/^}$/).each do |slice|
        data << slice
      end
      data
    end
  end
end