#!/usr/bin/env ruby

unless File.respond_to? :realpath
  class File #:nodoc:
    def self.realpath path
      return realpath(File.readlink(path)) if symlink?(path)
      path
    end
  end
end
$: << File.expand_path(File.dirname(File.realpath(__FILE__)) + '/../lib')

require 'hatchet'
require 'thor'
require 'threaded'
require 'date'
require 'yaml'

class HatchetCLI < Thor
  desc "ci:install_heroku", "installs the `heroku` cli"
  define_method("ci:install_heroku") do
    if `which heroku` && $?.success?
      puts "The `heroku` command is already installed"
      return
    else
      puts "installing `heroku` command"
    end
    script = File.expand_path File.join(__dir__, "../etc/setup_heroku.sh")
    cmd(script)
  end

  desc "ci:setup", "sets up project to run on a linux CI environment"
  define_method("ci:setup") do
    script = File.expand_path File.join(__dir__, "../etc/ci_setup.rb")
    cmd(script)
  end

  desc "install", "installs repos defined in 'hatchet.json'"
  def install
    warn_dot_ignore!
    lock_hash = load_lockfile
    puts "Installing repos for hatchet"

    missing_commit = false
    dirs.map do |directory, git_repo|
      Threaded.later do
        commit = lock_hash[directory]
        directory = File.expand_path(directory)
        if !Dir[directory]&.empty?
          puts "== pulling '#{git_repo}' into '#{directory}'\n"
          pull(directory, git_repo)
        else
          puts "== cloning '#{git_repo}' into '#{directory}'\n"
          clone(directory, git_repo)
        end
        if commit
          checkout_commit(directory, commit)
        else
          missing_commit = true
        end
      end
    end.map(&:join)

    self.lock if missing_commit
  end

  desc "locks to specific git commits", "updates hatchet.lock"
  def lock
    lock_hash = {}
    lockfile_hash = load_lockfile(create_if_does_not_exist: true)
    dirs.map do |directory, git_repo|
      Threaded.later do
        puts "== locking #{directory}"
        unless Dir.exist?(directory)
          raise "Bad git repo #{git_repo.inspect}" if bad_repo?(git_repo)
          clone(directory, git_repo, quiet: false)
        end

        if lockfile_hash[directory] == "master"
          lock_hash[directory] = "master"
        elsif lockfile_hash[directory] == "main"
          lock_hash[directory] = "main"
        else
          commit = commit_at_directory(directory)
          lock_hash[directory] = commit
        end
      end
    end.map(&:join)

    lock_hash = lock_hash.sort
    File.open('hatchet.lock', 'w') {|f| f << lock_hash.to_yaml }

    puts "Done!"
  end

  desc "list", "lists all repos and their destination listed in hatchet.json"
  def list
    repos.each do |repo, directory|
      puts "#{repo}: #{directory}"
    end
  end

  desc "destroy [NAME]", "Deletes applications"
  option :all, :type => :boolean
  def destroy(name=nil)
    api_key      = ENV['HEROKU_API_KEY'] || `heroku auth:token`.chomp
    platform_api = PlatformAPI.connect_oauth(api_key, cache: Moneta.new(:Null))
    api_rate_limit = ApiRateLimit.new(platform_api)
    reaper       = Hatchet::Reaper.new(api_rate_limit: api_rate_limit)

    if options[:all]
      reaper.destroy_all
    elsif !name.nil?
      reaper.destroy_by_name(name)
    else
      raise "Must provide an app name or --all"
    end
  end

  private
  def load_lockfile(create_if_does_not_exist: false)
    return YAML.safe_load(File.read('hatchet.lock')).to_h
  rescue Errno::ENOENT
    if create_if_does_not_exist
      FileUtils.touch('hatchet.lock')
      {}
    else
      raise "No such file found `hatchet.lock` please run `$ bundle exec hatchet lock`"
    end
  end

  def bad_repo?(url)
    `git ls-remote --exit-code -h "#{url}"`
    $? != 0
  end

  def warn_dot_ignore!
    return false unless File.exist?('.gitignore')

    gitignore = File.open('.gitignore').read
    repo_path = config.repo_directory_path.gsub(/^\.\//, '') # remove ./ from front of dir
    return if gitignore.include?(repo_path)
    puts "WARNING: add #{File.join(repo_path, '*')} to your .gitignore file \n\n"
  end

  def config
    @config ||= Hatchet::Config.new
  end

  def repos
    config.repos
  end

  def dirs
    config.dirs
  end

  def checkout_commit(directory, commit)
    cmd("cd #{directory} && git fetch origin #{commit} && git checkout #{commit} && git checkout - && git reset --hard #{commit}")
  end

  def commit_at_directory(directory)
    cmd("cd #{directory} && git log -n1  --pretty=format:%H").strip
  end

  def pull(path, git_repo, commit: false)
    cmd("cd #{path} && git pull --rebase #{git_repo} --quiet")
  end

  def clone(path, git_repo, quiet: true)
    path = File.join(path, '..') # up one dir to prevent repos/codetriage/codetriage/#...
    FileUtils.mkdir_p(path)
    cmd("cd #{path} && git clone #{git_repo} --quiet", quiet: quiet)
  end

  def cmd(command, let_fail: false, stdin: nil, quiet: true)
    command = "printf '#{stdin}' | #{command}" if stdin
    puts "Running: #{command}" unless quiet
    result = `#{command}`
    return result if let_fail
    raise "Command #{command} failed:\n#{result}" unless $?.success?
    return result
  end
end

HatchetCLI.start(ARGV)