require 'danger/plugin_support/plugin'

module Danger
  # One way to support internal plugins is via `plugin.import` this gives you
  # the chance to quickly iterate without the need for building rubygems. As such,
  # it does not have the stringent rules around documentation expected of a public plugin.
  # It's worth noting, that you can also have plugins inside `./danger_plugins` and they
  # will be automatically imported into your Dangerfile at launch.
  #
  # @example Import a plugin available over HTTP
  #
  #          device_grid = "https://raw.githubusercontent.com/fastlane/fastlane/master/danger-device_grid/lib/device_grid/plugin.rb"
  #          plugin.import device_grid
  #
  # @example Import from a local file reference
  #
  #          plugin.import "danger/plugins/watch_plugin.rb"
  #
  # @example Import all files inside a folder
  #
  #          plugin.import "danger/plugins/*.rb"
  #
  # @see  danger/danger
  # @tags core, plugins

  class DangerfileImportPlugin < Plugin
    def self.instance_name
      'plugin'
    end

    # @!group Plugins
    # Download a local or remote plugin and use it inside the Dangerfile.
    #
    # @param    [String] path
    #           a local path or a https URL to the Ruby file to import
    #           a danger plugin from.
    # @return [void]

    def import(path)
      raise '`import` requires a string' unless path.kind_of?(String)
      path += '.rb' unless path.end_with?('.rb')

      if path.start_with?('http')
        import_url(path)
      else
        import_local(path)
      end
    end

    private

    # @!group Plugins
    # Download a remote plugin and use it locally.
    #
    # @param    [String] url
    #           https URL to the Ruby file to use
    # @return [void]
    def import_url(url)
      raise 'URL is not https, for security reasons `danger` only supports encrypted requests' unless url.start_with?('https://')

      require 'tmpdir'
      require 'faraday'

      @http_client ||= Faraday.new do |b|
        b.adapter :net_http
      end
      content = @http_client.get(url)

      Dir.mktmpdir do |dir|
        path = File.join(dir, 'temporary_remote_action.rb')
        File.write(path, content.body)
        import_local(path)
      end
    end

    # @!group Plugins
    # Import one or more local plugins.
    #
    # @param    [String] path
    #           The path to the file to import
    #           Can also be a pattern (./**/*plugin.rb)
    # @return [void]
    def import_local(path)
      Dir[path].each do |file|
        # Without the expand_path it would fail if the path doesn't start with ./
        require File.expand_path(file)
        refresh_plugins
      end
    end
  end
end