# Copyright (c) 2007 John Rollin Wulff <johnw@orcasnet.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

module CrudActions
  def index
    redirect_to :action => 'list'
  end
  
  def list
    items_per_page = (params[:items_per_page]||10).to_i
    page = (params[:page]||1).to_i
    klass.with_scope :find => { :limit => items_per_page, :offset => (items_per_page * (page - 1)) } do
      records = klass.find :all
      pset records
    end
    @paginator = ActionController::Pagination::Paginator.new self,
                                                             klass.count,
                                                             items_per_page,
                                                             page
    @title = klass.to_s.humanize.pluralize
  end
  
  def show
    record = klass.find params[:id]
    set record
    @title = record.to_s
  end
  
  def new
    set klass.new(params[symbol])
    @title = "New #{klass.to_s.humanize}"
  end
  
  def edit
    record = klass.find(params[:id])
    set record
    @title = "Edit #{record}"
  end
  
  def create
    record = klass.new params[symbol]
    set record
    begin
      record.save!
      flash[:message] = "#{klass} #{record} successfully created"
      redirect_to :action => 'show', :id => record, :format => params[:format]
    rescue ActiveRecord::RecordInvalid
      flash[:error] = record.errors.full_messages
      render :action => 'new'
    end
  end
  
  def update
    record = klass.find params[symbol][:id]
    set record
    begin
      record.attributes = params[symbol]
      record.save!
      flash[:message] = "#{klass} #{record} successfully updated."
      redirect_to :action => 'show', :id => record, :format => params[:format]
    rescue ActiveRecord::RecordInvalid
      flash[:error] = record.errors.full_messages
      render :action => 'edit'
    end
  end
  
  def destroy
    record = klass.find params[:id]
    record = record.destroy
    flash[:message] = "#{klass} #{record} successfully destroyed."
    redirect_to :action => 'list'
  end
  
  private
    def pset(val)
      set(val, true)
    end
    
    def set(val, plural = false)
      str = klass.to_s.underscore
      str = str.pluralize if plural
      self.instance_variable_set '@' + str, val
    end
    
    def klass
      eval self.class.to_s.gsub('Controller', '')
    end
    
    def symbol
      klass.class_name.underscore.to_sym
    end
end