require 'etc'
require 'json'
require 'pathname'
require 'fileutils'
require 'shellwords'

require 'octokit'
require 'sawyer'

require 'ext/dir'
require 'ext/utils'
require 'ext/string'
require 'ext/notify'
require 'ext/commify'
require 'ext/sawyer/resource'

require 'git/hub'

require 'git/multi/version'
require 'git/multi/settings'
require 'git/multi/commands'

module Git
  module Multi

    HOME             = Dir.home

    DEFAULT_WORKAREA = File.join(HOME, 'Workarea')
    WORKAREA         = git_option('git.multi.workarea', DEFAULT_WORKAREA)

    DEFAULT_TOKEN    = env_var('OCTOKIT_ACCESS_TOKEN') # same as Octokit
    TOKEN            = git_option('github.token', DEFAULT_TOKEN)

    CACHE            = File.join(HOME, '.git', 'multi')
    REPOSITORIES     = File.join(CACHE, 'repositories.byte')

    USER             = git_option('github.user')
    ORGANIZATIONS    = git_option('github.organizations').split(/\s*,\s*/)

    MAN_PAGE         = File.expand_path('../../man/git-multi.1', __dir__)
    HTML_PAGE        = File.expand_path('../../man/git-multi.html', __dir__)

    module_function

    #
    # local repositories (in WORKAREA)
    #

    @local_user_repositories = Hash.new { |repos, user|
      repos[user] = Dir.new(WORKAREA).git_repos(user)
    }

    @local_org_repositories = Hash.new { |repos, org|
      repos[org] = Dir.new(WORKAREA).git_repos(org)
    }

    def local_repositories
      (
        @local_user_repositories[USER] +
        ORGANIZATIONS.map { |org| @local_org_repositories[org] }
      ).flatten
    end

    #
    # remote repositories (on GitHub)
    #

    def github_repositories
      @github_repositories ||= (
        Git::Hub.user_repositories(USER) +
        ORGANIZATIONS.map { |org| Git::Hub.org_repositories(org) }
      ).flatten
    end

    def refresh_repositories
      File.directory?(CACHE) || FileUtils.mkdir_p(CACHE)

      File.open(REPOSITORIES, 'wb') do |file|
        Marshal.dump(github_repositories, file)
      end
    end

    #
    # the main `Git::Multi` capabilities
    #

    module Nike

      def just_do_it interactive, pipeline, options = {}
        working_dir = case options[:in_dir]
          when :parent_dir then self.parent_dir
          when :local_path then self.local_path
          else Dir.pwd
        end
        Dir.chdir(working_dir) do
          if $INTERACTIVE
            puts "%s (%s)" % [
              self.full_name.invert,
              self.fractional_index
            ]
            interactive.call(self)
          else
            pipeline.call(self)
          end
        end
      end

    end

    def repositories
      if File.size?(REPOSITORIES)
        @repositories ||= Marshal.load(File.read(REPOSITORIES)).tap do |projects|
          notify "Finished loading #{REPOSITORIES}"
          projects.each_with_index do |project, index|
            # ensure 'project' has handle on an Octokit client
            project.client = Git::Hub.send(:client)
            # adorn 'project', which is a Sawyer::Resource
            project.parent_dir = Pathname.new(File.join(WORKAREA, project.owner.login))
            project.local_path = Pathname.new(File.join(WORKAREA, project.full_name))
            project.fractional_index = "#{index + 1}/#{projects.count}"
            # fix 'project' => https://github.com/octokit/octokit.rb/issues/727
            project.compliant_ssh_url = 'ssh://%s/%s' % project.ssh_url.split(':', 2)
            # remove optional '.git' suffix from 'git@github.com:pvdb/git-multi.git'
            project.abbreviated_ssh_url = project.ssh_url.chomp('.git')
            # extend 'project' with 'just do it' capabilities
            project.extend Nike
          end
        end
      else
        refresh_repositories and repositories
      end
    end

    #
    # lists of repositories with a given state
    #

    def archived_repositories
      repositories.find_all(&:archived)
    end

    def forked_repositories
      repositories.find_all(&:fork)
    end

    def private_repositories
      repositories.find_all(&:private)
    end

    #
    # derived lists of repositories
    #

    def excess_repositories
      repository_full_names = repositories.map(&:full_name)
      local_repositories.reject { |project|
        repository_full_names.include? project.full_name
      }
    end

    def stale_repositories
      repository_full_names = github_repositories.map(&:full_name)
      repositories.reject { |project|
        repository_full_names.include? project.full_name
      }
    end

    def spurious_repositories
      cloned_repositories.find_all { |project|
        origin_url = `git -C #{project.local_path} config --get remote.origin.url`.chomp
        ![
          project.clone_url,
          project.ssh_url,
          project.compliant_ssh_url,
          project.abbreviated_ssh_url,
          project.git_url,
        ].include? origin_url
      }
    end

    def missing_repositories
      repositories.find_all { |project|
        !File.directory? project.local_path
      }
    end

    def cloned_repositories
      repositories.find_all { |project|
        File.directory? project.local_path
      }
    end

  end
end