module ActionView
  module Helpers
    
    module JavaScriptHelper
      
      # This function can be used to render rjs inline
      #
      # <%= javascript_function do |page|
      #   page.replace_html :list, :partial => 'list', :object => @list
      # end %>
      #
      def javascript_function(*args, &block)
        html_options = args.extract_options!
        function = args[0] || ''

        html_options.symbolize_keys!
        function = update_page(&block) if block_given?
        javascript_tag(function)
      end
      
      def jquery_id(id)
        id.to_s.count('#.*,>+~:[/ ') == 0 ? "##{id}" : id
      end
          
      def jquery_ids(ids)
        Array(ids).map{|id| jquery_id(id)}.join(',')
      end

    end
    
    module PrototypeHelper
      
      unless const_defined? :JQUERY_VAR
        JQUERY_VAR = '$'
      end
          
      unless const_defined? :JQCALLBACKS
        JQCALLBACKS = Set.new([ :beforeSend, :complete, :error, :success ] + (100..599).to_a)
        AJAX_OPTIONS = Set.new([ :before, :after, :condition, :url,
                         :asynchronous, :method, :insertion, :position,
                         :form, :with, :update, :script ]).merge(JQCALLBACKS)
      end
      
      def periodically_call_remote(options = {})
        frequency = options[:frequency] || 10 # every ten seconds by default
        code = "setInterval(function() {#{remote_function(options)}}, #{frequency} * 1000)"
        javascript_tag(code)
      end
      
      def remote_function(options)
        javascript_options = options_for_ajax(options)

        update = ''
        if options[:update] && options[:update].is_a?(Hash)
          update  = []
          update << "success:'#{options[:update][:success]}'" if options[:update][:success]
          update << "failure:'#{options[:update][:failure]}'" if options[:update][:failure]
          update  = '{' + update.join(',') + '}'
        elsif options[:update]
          update << "'#{options[:update]}'"
        end

        function = "#{JQUERY_VAR}.ajax(#{javascript_options})"

        function = "#{options[:before]}; #{function}" if options[:before]
        function = "#{function}; #{options[:after]}"  if options[:after]
        function = "if (#{options[:condition]}) { #{function}; }" if options[:condition]
        function = "if (confirm('#{escape_javascript(options[:confirm])}')) { #{function}; }" if options[:confirm]
        return function
      end
      
      class JavaScriptGenerator
        module GeneratorMethods
          
          def insert_html(position, id, *options_for_render)
            insertion = position.to_s.downcase
            insertion = 'append' if insertion == 'bottom'
            insertion = 'prepend' if insertion == 'top'
            call "#{JQUERY_VAR}(\"#{jquery_id(id)}\").#{insertion}", render(*options_for_render)
          end
          
          def replace_html(id, *options_for_render)
            insert_html(:html, id, *options_for_render)
          end
          
          def replace(id, *options_for_render)
            call "#{JQUERY_VAR}(\"#{jquery_id(id)}\").replaceWith", render(*options_for_render)
          end
          
          def remove(*ids)
            call "#{JQUERY_VAR}(\"#{jquery_ids(ids)}\").remove"
          end
          
          def show(*ids)
            call "#{JQUERY_VAR}(\"#{jquery_ids(ids)}\").show"
          end
          
          def hide(*ids)
            call "#{JQUERY_VAR}(\"#{jquery_ids(ids)}\").hide"
          end

          def toggle(*ids)
            call "#{JQUERY_VAR}(\"#{jquery_ids(ids)}\").toggle"
          end
          
          def jquery_id(id)
            id.to_s.count('#.*,>+~:[/ ') == 0 ? "##{id}" : id
          end
          
          def jquery_ids(ids)
            Array(ids).map{|id| jquery_id(id)}.join(',')
          end
          
        end
      end
      
    protected
      def options_for_ajax(options)
        js_options = build_callbacks(options)
        
        url_options = options[:url]
        url_options = url_options.merge(:escape => false) if url_options.is_a?(Hash)
        js_options['url'] = "'#{url_for(url_options)}'"
        js_options['async'] = false if options[:type] == :synchronous
        js_options['type'] = options[:method] ? method_option_to_s(options[:method]) : ( options[:form] ? "'post'" : nil )
        js_options['dataType'] = options[:datatype] ? "'#{options[:datatype]}'" : (options[:update] ? nil : "'script'")
        
        if options[:form]
          js_options['data'] = "#{JQUERY_VAR}.param(#{JQUERY_VAR}(this).serializeArray())"
        elsif options[:submit]
          js_options['data'] = "#{JQUERY_VAR}(\"##{options[:submit]} :input\").serialize()"
        elsif options[:with]
          js_options['data'] = options[:with].gsub("Form.serialize(this.form)","#{JQUERY_VAR}.param(#{JQUERY_VAR}(this.form).serializeArray())")
        end
        
        js_options['type'] ||= "'post'"
        if options[:method]
          if method_option_to_s(options[:method]) == "'put'" || method_option_to_s(options[:method]) == "'delete'"
            js_options['type'] = "'post'"
            if js_options['data']
              js_options['data'] << " + '&"
            else
              js_options['data'] = "'"
            end
            js_options['data'] << "_method=#{options[:method]}'"
          end
        end
        
        if respond_to?('protect_against_forgery?') && protect_against_forgery?
          if js_options['data']
            js_options['data'] << " + '&"
          else
            js_options['data'] = "'"
          end
          js_options['data'] << "#{request_forgery_protection_token}=' + encodeURIComponent('#{escape_javascript form_authenticity_token}')"
        end
        js_options['data'] = "''" if js_options['type'] == "'post'" && js_options['data'].nil?
        options_for_javascript(js_options.reject {|key, value| value.nil?})
      end
      
      def build_update_for_success(html_id, insertion=nil)
        insertion = build_insertion(insertion)
        "#{JQUERY_VAR}('#{jquery_id(html_id)}').#{insertion}(request);"
      end

      def build_update_for_error(html_id, insertion=nil)
        insertion = build_insertion(insertion)
        "#{JQUERY_VAR}('#{jquery_id(html_id)}').#{insertion}(request.responseText);"
      end

      def build_insertion(insertion)
        insertion = insertion ? insertion.to_s.downcase : 'html'
        insertion = 'append' if insertion == 'bottom'
        insertion = 'prepend' if insertion == 'top'
        insertion
      end

      def build_observer(klass, name, options = {})
        if options[:with] && (options[:with] !~ /[\{=(.]/)
          options[:with] = "'#{options[:with]}=' + value"
        else
          options[:with] ||= 'value' unless options[:function]
        end

        callback = options[:function] || remote_function(options)
        javascript  = "#{JQUERY_VAR}('#{jquery_id(name)}').delayedObserver("
        javascript << "#{options[:frequency] || 0}, "
        javascript << "function(element, value) {"
        javascript << "#{callback}}"
        #javascript << ", '#{options[:on]}'" if options[:on]
        javascript << ")"
        javascript_tag(javascript)
      end
      
      def build_callbacks(options)
        callbacks = {}
        options[:beforeSend] = '';
        [:uninitialized,:loading,:loaded].each do |key|
          options[:beforeSend] << (options[key].last == ';' ? options.delete(key) : options.delete(key) << ';') if options[key]
        end
        options.delete(:beforeSend) if options[:beforeSend].blank?
        options[:error] = options.delete(:failure) if options[:failure]
        if options[:update]
          if options[:update].is_a?(Hash)
            options[:update][:error] = options[:update].delete(:failure) if options[:update][:failure]
            if options[:update][:success]
              options[:success] = build_update_for_success(options[:update][:success], options[:position]) << (options[:success] ? options[:success] : '')
            end
            if options[:update][:error]
              options[:error] = build_update_for_error(options[:update][:error], options[:position]) << (options[:error] ? options[:error] : '')
            end
          else
            options[:success] = build_update_for_success(options[:update], options[:position]) << (options[:success] ? options[:success] : '')
          end
        end
        options.each do |callback, code|
          if JQCALLBACKS.include?(callback)
            callbacks[callback] = "function(request){#{code}}"
          end
        end
        callbacks
      end
      
    end
    
    class JavaScriptElementProxy < JavaScriptProxy #:nodoc:
      
      unless const_defined? :JQUERY_VAR
        JQUERY_VAR = ActionView::Helpers::PrototypeHelper::JQUERY_VAR
      end
      
      def initialize(generator, id)
        id = id.to_s.count('#.*,>+~:[/ ') == 0 ? "##{id}" : id
        @id = id
        super(generator, "#{JQUERY_VAR}(\"#{id}\")")
      end
      
      def replace_html(*options_for_render)
        call 'html', @generator.send(:render, *options_for_render)
      end

      def replace(*options_for_render)
        call 'replaceWith', @generator.send(:render, *options_for_render)
      end
      
      def reload(options_for_replace={})
        replace(options_for_replace.merge({ :partial => @id.to_s.sub(/^#/,'') }))
      end
      
      def value()
        call 'val()'
      end

      def value=(value)
        call 'val', value
      end
      
    end
    
    class JavaScriptElementCollectionProxy < JavaScriptCollectionProxy #:nodoc:\
      
      unless const_defined? :JQUERY_VAR
        JQUERY_VAR = ActionView::Helpers::PrototypeHelper::JQUERY_VAR
      end
      
      def initialize(generator, pattern)
        super(generator, "#{JQUERY_VAR}(#{pattern.to_json})")
      end
    end
    
    module ScriptaculousHelper
      
      unless const_defined? :JQUERY_VAR
        JQUERY_VAR = ActionView::Helpers::PrototypeHelper::JQUERY_VAR
      end
      
      unless const_defined? :SCRIPTACULOUS_EFFECTS
        SCRIPTACULOUS_EFFECTS = {
          :appear => {:method => 'fadeIn'},
          :blind_down => {:method => 'blind', :mode => 'show', :options => {:direction => 'vertical'}},
          :blind_up => {:method => 'blind', :mode => 'hide', :options => {:direction => 'vertical'}},
          :blind_right => {:method => 'blind', :mode => 'show', :options => {:direction => 'horizontal'}},
          :blind_left => {:method => 'blind', :mode => 'hide', :options => {:direction => 'horizontal'}},
          :bounce_in => {:method => 'bounce', :mode => 'show', :options => {:direction => 'up'}},
          :bounce_out => {:method => 'bounce', :mode => 'hide', :options => {:direction => 'up'}},
          :drop_in => {:method => 'drop', :mode => 'show', :options => {:direction => 'up'}},
          :drop_out => {:method => 'drop', :mode => 'hide', :options => {:direction => 'down'}},
          :fade => {:method => 'fadeOut'},
          :fold_in => {:method => 'fold', :mode => 'hide'},
          :fold_out => {:method => 'fold', :mode => 'show'},
          :grow => {:method => 'scale', :mode => 'show'},
          :shrink => {:method => 'scale', :mode => 'hide'},
          :slide_down => {:method => 'slide', :mode => 'show', :options => {:direction => 'up'}},
          :slide_up => {:method => 'slide', :mode => 'hide', :options => {:direction => 'up'}},
          :slide_right => {:method => 'slide', :mode => 'show', :options => {:direction => 'left'}},
          :slide_left => {:method => 'slide', :mode => 'hide', :options => {:direction => 'left'}},
          :squish => {:method => 'scale', :mode => 'hide', :options => {:origin => "['top','left']"}},
          :switch_on => {:method => 'clip', :mode => 'show', :options => {:direction => 'vertical'}},
          :switch_off => {:method => 'clip', :mode => 'hide', :options => {:direction => 'vertical'}},
          :toggle_appear => {:method => 'fadeToggle'},
          :toggle_slide => {:method => 'slide', :mode => 'toggle', :options => {:direction => 'up'}},
          :toggle_blind => {:method => 'blind', :mode => 'toggle', :options => {:direction => 'vertical'}},
        }
      end
      
      def visual_effect(name, element_id = false, js_options = {})
        element = element_id ? element_id : "this"
        
        if SCRIPTACULOUS_EFFECTS.has_key? name.to_sym
          effect = SCRIPTACULOUS_EFFECTS[name.to_sym]
          name = effect[:method]
          mode = effect[:mode]
          js_options = js_options.merge(effect[:options]) if effect[:options]
        end
        
        [:color, :direction].each do |option|
          js_options[option] = "'#{js_options[option]}'" if js_options[option]
        end
        
        if js_options.has_key? :duration
          speed = js_options.delete :duration
          speed = (speed * 1000).to_i unless speed.nil?
        else
          speed = js_options.delete :speed
        end
        
        if ['fadeIn','fadeOut','fadeToggle'].include?(name)
          javascript = "#{JQUERY_VAR}('#{jquery_id(element_id)}').#{name}("
          javascript << "#{speed}" unless speed.nil?
          javascript << ");"
        else
          javascript = "#{JQUERY_VAR}('#{jquery_id(element_id)}').#{mode || 'effect'}('#{name}'"
          javascript << ",#{options_for_javascript(js_options)}" unless speed.nil? && js_options.empty?
          javascript << ",#{speed}" unless speed.nil?
          javascript << ");"
        end
        
      end
      
      def sortable_element_js(element_id, options = {}) #:nodoc:
        #convert similar attributes
        options[:handle] = ".#{options[:handle]}" if options[:handle]
        if options[:tag] || options[:only]
          options[:items] = "> "
          options[:items] << options.delete(:tag) if options[:tag]
          options[:items] << ".#{options.delete(:only)}" if options[:only]
        end
        options[:connectWith] = options.delete(:containment).map {|x| "##{x}"} if options[:containment]
        options[:containment] = options.delete(:container) if options[:container]
        options[:dropOnEmpty] = false unless options[:dropOnEmpty]
        options[:helper] = "'clone'" if options[:ghosting] == true
        options[:axis] = case options.delete(:constraint)
          when "vertical"
            "y"
          when "horizontal"
            "x"
          when false
            nil
          when nil
            "y"
        end
        options.delete(:axis) if options[:axis].nil?
        options.delete(:overlap)
        options.delete(:ghosting)
        
        if options[:onUpdate] || options[:url]
          options[:with] ||= "#{JQUERY_VAR}(this).sortable('serialize',{key:'#{element_id}[]'})"
          options[:onUpdate] ||= "function(){" + remote_function(options) + "}"
        end
        
        options.delete_if { |key, value| PrototypeHelper::AJAX_OPTIONS.include?(key) }
        options[:update] = options.delete(:onUpdate) if options[:onUpdate]
        
        [:axis, :cancel, :containment, :cursor, :handle, :tolerance, :items, :placeholder].each do |option|
          options[option] = "'#{options[option]}'" if options[option]
        end
        
        options[:connectWith] = array_or_string_for_javascript(options[:connectWith]) if options[:connectWith]
        
        %(#{JQUERY_VAR}('#{jquery_id(element_id)}').sortable(#{options_for_javascript(options)});)
      end
      
      def draggable_element_js(element_id, options = {})
        %(#{JQUERY_VAR}("#{jquery_id(element_id)}").draggable(#{options_for_javascript(options)});)
      end
      
      def drop_receiving_element_js(element_id, options = {})
        #convert similar options
        options[:hoverClass] = options.delete(:hoverclass) if options[:hoverclass]
        options[:drop] = options.delete(:onDrop) if options[:onDrop]
        
        if options[:drop] || options[:url]
          options[:with] ||= "'id=' + encodeURIComponent(#{JQUERY_VAR}(ui.draggable).attr('id'))"
          options[:drop] ||= "function(ev, ui){" + remote_function(options) + "}"
        end
        
        options.delete_if { |key, value| PrototypeHelper::AJAX_OPTIONS.include?(key) }

        options[:accept] = array_or_string_for_javascript(options[:accept]) if options[:accept]    
        [:activeClass, :hoverClass, :tolerance].each do |option|
          options[option] = "'#{options[option]}'" if options[option]
        end
        
        %(#{JQUERY_VAR}('#{jquery_id(element_id)}').droppable(#{options_for_javascript(options)});)
      end
      
    end
    
  end
end