module RailsDbAdmin
  module ErpApp
    module Desktop
      class QueriesController < BaseController

        def save_query
          query = params[:query]
          query_name  = params[:query_name]

          @query_support.save_query(query, query_name)

          render :json => {:success => true}
        end

        def saved_queries
          names = @query_support.get_saved_query_names

          names_hash_array = []

          names_hash_array = names.collect do |name|
            {:display => name, :value => name}
          end unless names.empty?

          render :json => {:data => names_hash_array}
        end

        def delete_query
          query_name  = params[:query_name]
          @query_support.delete_query(query_name)

          render :json => {:success => true}
        end

        def saved_queries_tree
          names = @query_support.get_saved_query_names

          queries = []

          queries = names.collect do |name|
            {:text => name, :id => name, :iconCls => 'icon-document', :leaf => true}
          end unless names.empty?

          render :json => queries
        end

        def open_query
          query_name = params[:query_name]
          query = @query_support.get_query(query_name)

          render :json => {:success => true, :query => query}
        end

        def open_and_execute_query
          result = {}
          query_name = params[:query_name]

          query = @query_support.get_query(query_name)
          columns, values, exception = @query_support.execute_sql(query)

          if columns.blank? || values.blank?
            result = {:success => false, :query => query,
              :exception => "Empty result set"}
          elsif exception.nil?

            columns_array = columns.collect do |column|
              RailsDbAdmin::Extjs::JsonColumnBuilder.build_readonly_column(column)
            end

            fields_array = columns.collect do |column|
              {:name => column}
            end

            result = {:success => true, :query => query,
              :columns => columns_array,
              :fields => fields_array, :data => values}
          else
            result = {:success => false, :query => query,
              :exception => exception.gsub("\n", " ")}
          end

          render :json => result
        end

        def select_top_fifty
          table = params[:table]
          sql, results = @query_support.select_top_fifty(table)

          columns = @database_connection_class.connection.columns(table)

          render :json => {:success => true,
            :sql => sql,
            :columns => RailsDbAdmin::Extjs::JsonColumnBuilder.build_grid_columns(columns),
            :fields => RailsDbAdmin::Extjs::JsonColumnBuilder.build_store_fields(columns),
            :data => results}
        end

        def execute_query
          sql = params[:sql]
          selection = params[:selected_sql]
          sql = sql.rstrip
          cursor_pos = params[:cursor_pos].to_i

          #append a semicolon as the last character if the
          #user forgot
          if !sql.end_with?(";")
            sql << ";"
          end

          sql_arr = sql.split("\n")
          sql_stmt_arry = []
          sql_str = ""

          #search for the query to run based on cursor position if there
          #was nothing selected by the user
          if (selection == nil || selection == "")
            last_stmt_end = 0
            sql_arr.each_with_index do |val,idx|
              if val.match(';')
                sql_stmt_arry << {:begin => (sql_stmt_arry.length > 0) ? last_stmt_end +1 : 0, :end => idx}
                last_stmt_end = idx
              end
            end

            last_sql_stmt = sql_stmt_arry.length-1
            #run the first complete query if we're in whitespace
            #at the beginning of the text area
            if cursor_pos <= sql_stmt_arry[0].fetch(:begin)
              sql_str = sql_arr.values_at(sql_stmt_arry[0].fetch(:begin)..
                sql_stmt_arry[0].fetch(:end)).join(" ")
              #run the last query if we're in whitespace at the end of the
              #textarea
            elsif cursor_pos > sql_stmt_arry[last_sql_stmt].fetch(:begin)
              sql_str = sql_arr.values_at(
                sql_stmt_arry[last_sql_stmt].fetch(:begin)..
                sql_stmt_arry[last_sql_stmt].fetch(:end)).join(" ")
              #run query based on cursor position
            else
              sql_stmt_arry.each do |sql_stmt|
                if cursor_pos >= sql_stmt.fetch(:begin) &&
                    cursor_pos <= sql_stmt.fetch(:end)
                  sql_str = sql_arr.values_at(sql_stmt.fetch(:begin)..
                    sql_stmt.fetch(:end)).join(" ")
                end
              end
            end
          else
            sql_str = selection
          end

          columns, values, exception = @query_support.execute_sql(sql_str)

          if !exception.nil?
            result = {:success => false, :exception => exception.gsub("\n"," ")}
          elsif columns.empty? || values.empty?
            result = {:success => false, :exception => "Empty result set"}
          else exception.nil?
            columns_array = columns.collect do |column|
              RailsDbAdmin::Extjs::JsonColumnBuilder.build_readonly_column(column)
            end

            fields_array = columns.collect do |column|
              {:name => column}
            end

            result = {:success => true, :sql => sql,
              :columns => columns_array,
              :fields => fields_array, :data => values}
          end
          render :json => result
        end

      end #QueriesController
    end #Desktop
  end #ErpApp
end #RailsDbAdmin