module Jasmine
  ConfigNotFound = Class.new(Exception)
  require 'yaml'
  require 'erb'
  def self.configure(&block)
    block.call(self.config)
  end

  def self.initialize_config
    return if @config
    @config = Jasmine::Configuration.new
    core_config = Jasmine::CoreConfiguration.new

    @config.add_path_mapper(Jasmine::PathMapper.method(:new))

    @config.jasmine_path = jasmine_path = '/__jasmine__'
    @config.src_path = src_path = '/'
    @config.spec_path = spec_path = '/__spec__'
    @config.boot_path = boot_path = '/__boot__'
    @config.runner_boot_path = runner_boot_path = '/__runner_boot__'
    @config.image_path = image_path = '/__images__'

    @config.jasmine_dir = core_config.path
    @config.boot_dir = core_config.boot_dir
    @config.boot_files = lambda { core_config.boot_files }
    @config.jasmine_files = lambda { core_config.js_files }
    @config.jasmine_css_files = lambda { core_config.css_files }
    @config.add_rack_path(jasmine_path, lambda { Rack::File.new(config.jasmine_dir) })
    @config.add_rack_path(boot_path, lambda { Rack::File.new(config.boot_dir) })
    @config.add_rack_path(runner_boot_path, lambda { Rack::File.new(config.runner_boot_dir) })
    if Jasmine::Dependencies.use_asset_pipeline?
      @config.add_rack_path(spec_path, lambda {
        sprockets_spec_env = Sprockets::Environment.new
        sprockets_spec_env.append_path @config.spec_dir
        Rails.application.assets.paths.each do |path|
          sprockets_spec_env.append_path(path)
        end
        sprockets_spec_env
      })
    else
      @config.add_rack_path(spec_path, lambda { Rack::File.new(config.spec_dir) })
    end
    @config.add_rack_path(image_path, lambda { Rack::File.new(core_config.images_dir) })
    @config.add_rack_path(src_path, lambda {
      Rack::Cascade.new([
        Rack::URLMap.new('/' => Rack::File.new(config.src_dir)),
        Rack::Jasmine::Runner.new(Jasmine::Page.new(config))
      ])
    })

    @config.add_rack_app(Rack::Head)
    @config.add_rack_app(Rack::Jasmine::CacheControl)

    if Jasmine::Dependencies.use_asset_pipeline?
      @config.add_path_mapper(lambda { |config|
        asset_expander = Jasmine::AssetExpander.new
        Jasmine::AssetPipelineMapper.new(config, asset_expander.method(:expand))
      })
      # In order to have asset helpers like asset_path and image_path, we need to require 'action_view/base'.  This
      # triggers run_load_hooks on action_view which, in turn, causes sprockets/railtie to load the Sprockets asset
      # helpers and set some configuration options.
      Rails.application.assets.context_class.instance_eval do
        if Jasmine::Dependencies.rails4?
          require 'action_view/base'
          Rails.application.assets.context_class.assets_prefix = Rails.application.config.assets.prefix
        end
      end
      @config.add_rack_path(Rails.application.config.assets.prefix, lambda {
        Rails.application.assets
      })
    end

    @config.runner = lambda do |formatter, jasmine_server_url|
      Jasmine::Runners::PhantomJs.new(formatter,
                                      jasmine_server_url,
                                      @config.prevent_phantom_js_auto_install,
                                      @config.show_console_log,
                                      @config.phantom_config_script,
                                      @config.show_full_stack_trace,
                                      @config.phantom_cli_options)
    end
  end

  def self.config
    initialize_config
    @config
  end

  def self.load_configuration_from_yaml(path = nil)
    path ||= File.join(Dir.pwd, 'spec', 'javascripts', 'support', 'jasmine.yml')
    if File.exist?(path)
      yaml_loader = lambda do |filepath|
        YAML::load(ERB.new(File.read(filepath)).result(binding)) if File.exist?(filepath)
      end
      yaml_config = Jasmine::YamlConfigParser.new(path, Dir.pwd, Jasmine::PathExpander.method(:expand), yaml_loader)
      Jasmine.configure do |config|
        config.jasmine_dir = yaml_config.jasmine_dir if yaml_config.jasmine_dir
        config.jasmine_files = lambda { yaml_config.jasmine_files } if yaml_config.jasmine_files.any?
        config.jasmine_css_files = lambda { yaml_config.jasmine_css_files } if yaml_config.jasmine_css_files.any?
        config.boot_dir = yaml_config.boot_dir if yaml_config.boot_dir
        config.boot_files = lambda { yaml_config.boot_files } if yaml_config.boot_files.any?

        config.src_dir = yaml_config.src_dir
        config.src_files = lambda { yaml_config.src_files }
        config.css_files = lambda { yaml_config.css_files }

        config.spec_dir = yaml_config.spec_dir
        config.helper_files = lambda { yaml_config.helpers }
        config.spec_files = lambda { yaml_config.spec_files }

        config.show_console_log = yaml_config.show_console_log
        config.stop_spec_on_expectation_failure = yaml_config.stop_spec_on_expectation_failure
        config.stop_on_spec_failure = yaml_config.stop_on_spec_failure
        config.random = yaml_config.random
        config.phantom_config_script = yaml_config.phantom_config_script
        config.phantom_cli_options = yaml_config.phantom_cli_options

        config.rack_options = yaml_config.rack_options
      end
      require yaml_config.spec_helper if File.exist?(yaml_config.spec_helper)
    else
     raise ConfigNotFound, "Unable to load jasmine config from #{path}"
    end
  end

  def self.load_spec(spec_path)
    return if spec_path.nil?
    Jasmine.configure do |c|
      c.spec_files = lambda { [spec_path] }
    end
  end
end