property :repository,      String, name_property: true
property :master_token,    String
property :force_os,        String
property :force_dist,      String
property :type,            String, equal_to: %w(deb rpm gem), default: lazy { node['packagecloud']['default_type'] }
property :base_url,        String, default: 'https://packagecloud.io'
property :priority,        [Integer, TrueClass, FalseClass], default: false
property :metadata_expire, String, regex: [/^\d+[d|h|m]?$/], default: '300'

action :add do
  case new_resource.type
  when 'deb'
    install_deb
  when 'rpm'
    install_rpm
  when 'gem'
    install_gem
  else
    raise "#{new_resource.type} is an unknown package type."
  end
end

action_class.class_eval do
  include ::PackageCloud::Helper

  require 'uri'

  def gpg_url(base_url, repo, format, master_token)
    base_install_url = ::File.join(base_url, node['packagecloud']['base_repo_path'])
    ext = (format == :deb) ? 'list' : 'repo'
    gpg_key_url_endpoint = construct_uri_with_options(base_url: base_install_url, repo: repo, endpoint: "gpg_key_url.#{ext}")
    unless master_token.nil?
      gpg_key_url_endpoint.user = master_token
      gpg_key_url_endpoint.password = ''
    end

    URI(get(gpg_key_url_endpoint, install_endpoint_params).body.chomp)
  end

  def install_deb
    base_url = new_resource.base_url
    repo_url = construct_uri_with_options(base_url: base_url, repo: new_resource.repository, endpoint: os_platform)

    Chef::Log.debug("#{new_resource.name} deb repo url = #{repo_url}")

    package 'wget'
    package 'apt-transport-https'
    package 'lsb-release'

    ohai "reload-lsb-#{filename}" do
      plugin 'lsb'
      action :nothing
      subscribes :reload, 'package[lsb-release]', :immediately
    end

    repo_url = read_token(repo_url)

    template "/etc/apt/sources.list.d/#{filename}.list" do
      source 'apt.erb'
      cookbook 'packagecloud'
      mode '0644'
      variables lazy {
        { base_url: repo_url.to_s,
          distribution: dist_name,
          component: 'main' }
      }

      notifies :run, "execute[apt-key-add-#{filename}]", :immediately
      notifies :run, "execute[apt-get-update-#{filename}]", :immediately
    end

    execute "apt-key-add-#{filename}" do # ~FC041
      command lazy {
        gpg_url = gpg_url(new_resource.base_url, new_resource.repository, :deb, new_resource.master_token)
        "wget --auth-no-challenge -qO - #{gpg_url} | apt-key add -"
      }
      action :nothing
    end

    execute "apt-get-update-#{filename}" do
      command "apt-get update -o Dir::Etc::sourcelist=\"sources.list.d/#{filename}.list\"" \
              ' -o Dir::Etc::sourceparts="-"' \
              ' -o APT::Get::List-Cleanup="0"'
      action :nothing
    end
  end

  def install_rpm
    given_base_url = new_resource.base_url
    base_repo_url = ::File.join(given_base_url, node['packagecloud']['base_repo_path'])
    base_url_endpoint = construct_uri_with_options(base_url: base_repo_url, repo: new_resource.repository, endpoint: 'rpm_base_url')

    if new_resource.master_token
      base_url_endpoint.user     = new_resource.master_token
      base_url_endpoint.password = ''
    end

    base_url = URI(get(base_url_endpoint, install_endpoint_params).body.chomp)

    Chef::Log.debug("#{new_resource.name} rpm base url = #{base_url}")

    package 'pygpgme' do
      ignore_failure true
    end

    log 'pygpgme_warning' do
      message 'The pygpgme package could not be installed. This means GPG verification is not possible for any RPM installed on your system. ' \
              'To fix this, add a repository with pygpgme. Usualy, the EPEL repository for your system will have this. ' \
              'More information: https://fedoraproject.org/wiki/EPEL#How_can_I_use_these_extra_packages.3F and https://github.com/opscode-cookbooks/yum-epel'

      level :warn
      not_if 'rpm -qa | grep -qw pygpgme'
    end

    ruby_block 'disable repo_gpgcheck if no pygpgme' do
      block do
        template = run_context.resource_collection.find(template: "/etc/yum.repos.d/#{filename}.repo")
        template.variables[:repo_gpgcheck] = 0
      end
      not_if 'rpm -qa | grep -qw pygpgme'
    end

    gpg_url = gpg_url(new_resource.base_url, new_resource.repository, :rpm, new_resource.master_token)

    template "/etc/yum.repos.d/#{filename}.repo" do
      source 'yum.erb'
      cookbook 'packagecloud'
      mode '0644'
      variables base_url: base_url.to_s,
                name: filename,
                gpg_url: gpg_url.to_s,
                repo_gpgcheck: 1,
                description: filename,
                priority: new_resource.priority,
                metadata_expire: new_resource.metadata_expire

      notifies :run, "execute[yum-makecache-#{filename}]", :immediately
      notifies :run, "ruby_block[yum-cache-reload-#{filename}]", :immediately
    end

    # get the metadata for this repo only
    execute "yum-makecache-#{filename}" do
      command "yum -q makecache -y --disablerepo=* --enablerepo=#{filename}"
      action :nothing
    end

    # reload internal Chef yum cache
    ruby_block "yum-cache-reload-#{filename}" do
      block { Chef::Provider::Package::Yum::YumCache.instance.reload }
      action :nothing
    end
  end

  def install_gem
    base_url = new_resource.base_url

    repo_url = construct_uri_with_options(base_url: base_url, repo: new_resource.repository)
    repo_url = read_token(repo_url, true).to_s

    execute "install packagecloud #{new_resource.name} repo as gem source" do
      command "gem source --add #{repo_url}"
      not_if "gem source --list | grep #{repo_url}"
    end
  end

  def read_token(repo_url, gems = false)
    return repo_url unless new_resource.master_token

    base_url = new_resource.base_url

    base_repo_url = ::File.join(base_url, node['packagecloud']['base_repo_path'])

    uri = construct_uri_with_options(base_url: base_repo_url, repo: new_resource.repository, endpoint: 'tokens.text')
    uri.user     = new_resource.master_token
    uri.password = ''

    resp = post(uri, install_endpoint_params)

    Chef::Log.debug("#{new_resource.name} TOKEN = #{resp.body.chomp}")

    if rhel5? && !gems
      repo_url
    else
      repo_url.user     = resp.body.chomp
      repo_url.password = ''
      repo_url
    end
  end

  def install_endpoint_params
    dist = dist_name

    hostname = node['packagecloud']['hostname_override'] ||
               node['fqdn'] ||
               node['hostname']

    if !hostname || hostname.empty?
      raise("Can't determine hostname!  Set node['packagecloud']['hostname_override'] " \
            'if it cannot be automatically determined by Ohai.')
    end

    { os: os_platform,
      dist: dist,
      name: hostname }
  end

  def os_platform
    new_resource.force_os || node['platform']
  end

  def dist_name
    new_resource.force_dist || value_for_platform_family(
      'debian' => node['lsb']['codename'],
      'amazon' => '6',
      %w(rhel fedora) => node['platform_version']
    )
  end

  def filename
    new_resource.name.gsub(/[^0-9A-z.\-]/, '_')
  end

  def rhel5?
    platform_family?('rhel') && node['platform_version'].to_i == 5
  end

  def construct_uri_with_options(options)
    required_options = [:base_url, :repo]

    required_options.each do |opt|
      unless options[opt]
        raise ArgumentError,
              "A required option :#{opt} was not specified"
      end
    end

    options[:base_url] = append_trailing_slash(options[:base_url])
    options[:repo]     = append_trailing_slash(options[:repo])

    URI.join(options.delete(:base_url), options.inject([]) { |mem, opt| mem << opt[1] }.join)
  end

  def append_trailing_slash(str)
    str.end_with?('/') ? str : str + '/'
  end
end