# reference: http://github.com/ahe/2dc_jqgrid

module Gridify
  class Grid
    
    # ----------------------
    # generate the grid javascript for a view
    # options:
    #     :script => true generates <script> tag (true)
    #     :ready  => true generates jquery ready function (true)
    def to_javascript( options={} )
      options = { :script => true, :ready => true }.merge(options)
      
      s = ''
      if options[:script]
        s << %Q^
        <script type="text/javascript">
        var lastsel_#{dom_id};
        ^       
      end

      s << js_helpers

      if options[:ready]
        s << %Q^
        jQuery(document).ready(function(){
        ^
      end
      
      s << jqgrid_javascript(options)
                  
      if options[:ready]
        s << %Q^
        });
        ^ 
      end
      if options[:script]
        s << %Q^
        </script>
        ^
      end
      s     
    end
    
    def to_json
      jqgrid_properties.to_json_with_js
    end
  
    # alias :to_s, :to_javascript
    def to_s( options={} )
      to_javascript( options )
    end
            
    # ------------------
    protected
    # ------------------
  
    # //{ url: '/notes/{id}', mtype: 'PUT', reloadAfterSubmit: false, closeAfterEdit: true },  // edit settings
    # //{ url: '/notes', mtype: 'POST', reloadAfterSubmit: false, closeAfterEdit: true },  // add settings
    # //{ url: '/notes/{id}', mtype: 'DELETE', reloadAfterSubmit: false },  // delete settings
  
    # get the button options
    def edit_button_options
      # 'url' => '/notes/{id}', 'mtype' => 'PUT'
      #         {afterSubmit:function(r,data){return #{options[:error_handler_return_value]}(r,data,'edit');}},
      
      # note, closeAfterEdit will not close if response returns a non-empty string (even if "success" message)
      merge_options_defaults( edit_button || inline_edit, 
        'reloadAfterSubmit' => true, 
        'closeAfterEdit' => true,
        'afterSubmit' => "javascript: function(r,data){return #{error_handler_return_value}(r,data,'edit');}"
      )
    end
    
    def add_button_options
      # 'url' => '/notes', 'mtype' => 'POST'
      merge_options_defaults( add_button, 
        'reloadAfterSubmit' => true, 
        'closeAfterAdd' => true,
        'afterSubmit' => "javascript: function(r,data){return #{error_handler_return_value}(r,data,'add');}"
      )
    end
    
    def delete_button_options
      # 'url' => '/notes/{id}', 'mtype' => 'DELETE'
      merge_options_defaults( delete_button, 
        'reloadAfterSubmit' => true,
        'afterSubmit' => "javascript: function(r,data){return #{error_handler_return_value}(r,data,'delete');}"
      )
    end
    
    def search_button_options
      if search_advanced
        merge_options_defaults( search_advanced, 'multipleSearch' => true)
      else
        merge_options_defaults( search_button)
      end
    end
    
    def view_button_options
      merge_options_defaults( view_button)
    end
    
    # generate the jqGrid initial values in json
    #   maps our attributes to jqGrid options; omit values when same as jqGrid defaults
    def jqgrid_properties
      vals                     = {}
      vals[:ajaxGridOptions]   = ajax_grid_options if ajax_grid_options
      
      # data and request options
      vals[:url]               = url if url
      vals[:editurl]           = url if editable
      vals[:restful]           = true if restful
      vals[:inline_edit]       = inline_edit if inline_edit.present? 
      vals[:postData]          = { :grid => name, :datatype => data_type } #identify which grid making the request
      vals[:colNames]          = colNames if colNames.present?
      vals[:colModel]          = column_model if colModel.present?
      #vals[:colModel]          = colModel if colModel.present?
      vals[:datatype]          = data_type if data_type
      if data_format.present?
        case data_type
          when :xml
            vals[:xmlReader]     = data_format
          when :json
            vals[:jsonReader]    = data_format
        end
      end
        
      vals[:loadonce]          = load_once if load_once

      vals[:sortname]          = sort_by if sort_by
      vals[:sortorder]         = sort_order if sort_order && sort_by
      vals[:rowNum]            = rows_per_page if rows_per_page
      vals[:rowTotal]          = total_rows if total_rows
      vals[:page]              = current_page if current_page

      # grid options
      vals[:height]           = height if height
      vals[:gridview]         = grid_view # faster views, NOTE theres cases when this needs to be disabled
      
      case width_fit
        when :fitted
          #vals[:autowidth]    = false #default
          #vals[:shrinkToFit]  = true #default
          vals[:forceFit]      = true
          vals[:width]         = width if width
        
        when :scroll
          #vals[:autowidth]    = false #default
          vals[:shrinkToFit]   = false
          #vals[:forceFit]     = #ignored by jqGrid
          vals[:width]         = width if width
        
        else #when :fluid
          vals[:autowidth]     = true
          #vals[:shrinkToFit]  = true #default
          vals[:forceFit]      = true
          #vals[:width]        = is ignored
          vals[:resizeStop]    = 'javascript: gridify_fluid_recalc_width'
      end
      
      vals[:sortable]          = true if arranger_type.include?(:sortable)
      
      # header layer
      vals[:caption]           = title if title
      vals[:hidegrid]          = false unless collapsible
      vals[:hiddengrid]        = true if collapsed
      
      # row formatting
      vals[:altrows]           = true if alt_rows
      vals[:altclass]          = alt_rows if alt_rows.is_a?(String)
      
      vals[:rownumbers]        = true if row_numbers
      vals[:rownumWidth]       = row_numbers if row_numbers.is_a?(Numeric)
      
      if inline_edit 
        vals[:scrollrows]      = true
        vals[:multiselect]     = true if multi_select
        vals[:onSelectRow]     = "javascript: function(id, status) { if(id && id!==lastsel_#{dom_id}) { jQuery('##{dom_id}').jqGrid('restoreRow', lastsel_#{dom_id}); jQuery('##{dom_id}').jqGrid('editRow', id, true, #{inline_edit_handler}, #{error_handler}); lastsel_#{dom_id}=id}}"     
      elsif select_rows #.present?
        vals[:scrollrows]      = true
        vals[:onSelectRow]     = select_rows
        vals[:multiselect]     = true if multi_select
      else
        vals[:hoverrows]       = false
        vals[:beforeSelectRow] = "javascript: function(){ false; }"
      end
      
      # pager layer
      if pager
        vals[:pager]           = "##{pager}" 
        vals[:viewrecords]     = true     # display total records in the query (eg "1 - 10 of 25")
        vals[:rowList]         = paging_choices
        if paging_controls.is_a?(Hash)
          # allow override of jqGrid pager options
          vals.merge!(paging_controls)
        elsif !paging_controls
          vals[:rowList]       = []
          vals[:pgbuttons]     = false
          vals[:pginput]       = false
          vals[:recordtext]    = "{2} records"
        end
      end
      
      #subgrid
      if sub_grid      
        vals[:subGrid]      = sub_grid
        vals[:subGridUrl]   = sub_grid_url
        vals[:subGridModel] = sub_grid_model
        vals[:gridview]     = false
      end
      
      #events
      #vals[:serializeGridData] = serialize_grid_data if serialize_grid_data
      
      vals[:loadonce]          = load_once if load_once
      
      # allow override of native jqGrid options
      vals.merge(jqgrid_options)
      
     
    end
    
    # -----------------
    def jqgrid_javascript( options={} )
      s = ''

      if table_to_grid
        s << %Q^
        tableToGrid("##{dom_id}", #{to_json});
        ^
        s << %Q^
        grid_#{dom_id} = jQuery("##{dom_id}")
        ^ 
      else
        s << %Q^
        grid_#{dom_id} = jQuery("##{dom_id}").jqGrid(#{to_json})
        ^
      end
      
      s << ';'

      # tag the grid as fluid so we can find it on resize events  
      if width_fit == :fluid 
        s << %Q^
        jQuery("##{dom_id}").addClass("fluid");
        ^                    
      end

      # override tableToGrid colmodel options as needed (sortable)
      #s << %Q^ .jqGrid('setColProp','Title',{sortable: false})^

      # resize method
      if resizable
        s << %Q^
        jQuery("##{dom_id}").jqGrid('gridResize', #{resizable.to_json});
        ^  
      end

      # pager buttons (navGrid)
      if pager
        nav_params = { 
          'edit' => edit_button.present?,
          'add' => add_button.present?,
          'del' => delete_button.present?,
          'search' => search_button.present? || search_advanced.present?,
          'view' => view_button.present?,
          'refresh' => refresh_button.present?
        }.merge(jqgrid_nav_options||{})
        
        s << %Q^
        jQuery("##{dom_id}").jqGrid('navGrid', '##{pager}',
               #{nav_params.to_json},
               #{edit_button_options.to_json_with_js},
               #{add_button_options.to_json_with_js},
               #{delete_button_options.to_json_with_js},
               #{search_button_options.to_json_with_js},
               #{view_button_options.to_json_with_js}
               );
        ^
      end
      
      if arranger_type.include?(:hide_show)
        s << %Q^
        jQuery("##{dom_id}").jqGrid('navButtonAdd','##{pager}',{ 
               caption: "Columns", 
               title: "Hide/Show Columns", 
               onClickButton : function (){ jQuery("##{dom_id}").jqGrid('setColumns',
                 #{arranger_options(:hide_show).to_json_with_js} );
               }
        });
        ^
      end
      if arranger_type.include?(:chooser)
        # hackey way to build the string but gets it done
        chooser_code = %Q^ function (){ jQuery('##{dom_id}').jqGrid('columnChooser', {
                          done : function (perm) {
                            if (perm)  {
                              this.jqGrid('remapColumns', perm, true);
                              var gwdth = this.jqGrid('getGridParam','width');
                              this.jqGrid('setGridWidth',gwdth);
                            }
                          } })}^
        chooser_opts = {
          'caption' => 'Columns',
          'title' => 'Arrange Columns',
          'onClickButton' => 'chooser_code'
        }.merge(arranger_options(:chooser))
        s << %Q^
        jQuery("##{dom_id}").jqGrid('navButtonAdd','##{pager}', #{chooser_opts.to_json.gsub('"chooser_code"', chooser_code)} );
        ^
      end
      
      if search_toolbar
        # I wish we could put this in the header rather than the pager
        s << %Q^
        jQuery("##{dom_id}").jqGrid('navButtonAdd',"##{pager}", { caption:"Toggle", title:"Toggle Search Toolbar", buttonicon: 'ui-icon-pin-s', onClickButton: function(){ grid_#{dom_id}[0].toggleToolbar() } });
        jQuery("##{dom_id}").jqGrid('navButtonAdd',"##{pager}", { caption:"Clear", title:"Clear Search", buttonicon: 'ui-icon-refresh', onClickButton: function(){ grid_#{dom_id}[0].clearToolbar() } });
        jQuery("##{dom_id}").jqGrid('filterToolbar');
        ^
      end
      
      if sortable_rows
        # I wish we could put this in the header rather than the pager
        s << %Q^
        jQuery("##{dom_id}").jqGrid('sortableRows');
        ^
      end
      
      # TODO: built in event handlers, eg
      # loadError 
      # onSelectRow, onDblClickRow, onRightClickRow etc
      
      #unless search_toolbar == :visible
      #  s << %Q^
      #  grid_#{dom_id}[0].toggleToolbar();
      #  ^
      #end

      # # keep page controls centered (jqgrid bug) [eg appears when :width_fit => :scroll]
      # s << %Q^ $("##{pager}_left").css("width", "auto"); ^
        
      s     
    end

    # ------------------
    def js_helpers
      # just move this into appliaction.js?

      # gridify_fluid_recalc_width: allow grid resize on window resize events
      # recalculate width of grid based on parent container; handles multiple grids
      # ref: http://www.trirand.com/blog/?page_id=393/feature-request/Resizable%20grid/
      
      # afterSubmit: display error message in response
      
      %Q^
      function gridify_fluid_recalc_width(){
        if (grids = jQuery('.fluid.ui-jqgrid-btable:visible')) {
          grids.each(function(index) {
            gridId = jQuery(this).attr('id');
            gridParentWidth = jQuery('#gbox_' + gridId).parent().width();
            jQuery('#' + gridId).jqGrid('setGridWidth', gridParentWidth);
          });
        }
      };
            
      jQuery(window).live('resize', gridify_fluid_recalc_width);
      function gridify_action_error_handler(r, data, action){
        if (r.responseText != '') {
          return [false, r.responseText];
        } else  {
          return true;
        }
      }
      ^
    end


    # if(r.responseText != "") {
    #   $('#{error_container}').html(r.responseText);
    #   $('#{error_container}').slideDown();
    #   //window.setTimeout(function() { // Hide error div after 6 seconds
    #   // $('#{error_container}').slideUp();
    #   //}, 6000);
    #   return false;
    # }
    # return true;
    
    # lets options be true or a hash, merges into defaults and returns a hash
    def merge_options_defaults( options, defaults={} )
      if options
        defaults.merge( options==true ? {} : options)
      else
        {}
      end
    end
       
  end
end

class Hash
  # replace embedded '"javascript: foo"' with 'foo'
  def to_json_with_js
    self.to_json.gsub(/\"javascript: ([^"]*)\"/) {|string| string[1..-2].gsub('javascript:','') }
  end
end

module JqgridJson
  include ActionView::Helpers::JavaScriptHelper
  include HandleAttributes

  def to_subgrid_json(attributes)
    json = %Q({)
    if self.empty?
      json << "}"
    else
      json <<= %Q("rows":[)
      each do |elem|
        elem.id ||= index(elem)
        json << %Q({"id":"#{elem.id}","cell":[)
        couples = elem.attributes.symbolize_keys
        attributes.each do |atr|
          value = get_atr_value(elem, atr, couples)
          value = escape_javascript(value) if value and value.is_a? String
          json << %Q("#{value}",)
        end
        json.chop! << "]},"
      end
      json.chop! << "]}"
    end
  end
end

class Array
  include JqgridJson
end