require 'date'
require 'ostruct'

class OpenStruct
  def temp hash
    OpenStruct.new(@table.merge(hash))
  end
end

module Merb
  module FormControls
    #
    # this is the main merb form control helper. It can build
    # either textfield, textarea, date selects, or time selects.
    #
    # <%= control_for @post, :title, :text, :id => 'foo', :size => 53 %>
    # <%= control_for @post, :intro, :textarea, :class => 'post_intro', 
    #	                                          :rows => 10, :cols => 50 %>
    # <%= control_for @post, :created_at, :time %>
    # <%= control_for @post, :published_at, :date %>
    #
    # TODO : is this useful enough? Needs some love
    def control_for(obj, meth, type, opts={})
      instance = obj
      obj = obj.class
      o = OpenStruct.new(:name  => "#{obj.to_s.downcase}[#{meth}]",
                         :value => (instance.send(meth) rescue nil),
                         :title => (opts.has_key?(:title) ? opts.delete(:title) : nil),
                         :html  => opts)            
      Control.send(type, o)                
    end
    
    module Control
      
      # This is ripped wholesale from Ramaze with some modifications to work
      # with AR objects instead of Og. Thanks again to Michael Fellinger
      class << self

        def number(o)
          o.value ||= 0
          text(o)
        end

        def text(o)
          o.value ||= ""
          tag = ''
          tag << "#{o.title}: " if o.title
          tag << %{<input type="text" name="#{o.name}" value="#{o.value}" #{o.html ? o.html.map{|k,v| "#{k}=\"#{v}\""}.join(' ') : nil}/>}
        end

        def textarea(o)
          o.value ||= ""
          %{<textarea name="#{o.name}" #{o.html ? o.html.map{|k,v| "#{k}=\"#{v}\""}.join(' ') : nil}>#{o.value}</textarea>}
        end

        def date(o)
          o.value ||= Date.today
          selects = []
          selects << date_day(o.temp(:value => o.value.day))
          selects << date_month(o.temp(:value => o.value.month))
          selects << date_year(o.temp(:value => o.value.year))
          selects.join("\n")
        end

        def time(o)
          o.value ||= Time.now
          selects = []
          selects << date_day(o.temp(:value => o.value.day))
          selects << date_month(o.temp(:value => o.value.month))
          selects << date_year(o.temp(:value => o.value.year))
          selects << time_hour(o.temp(:value => o.value.hour))
          selects << time_minute(o.temp(:value => o.value.min))
          selects << time_second(o.temp(:value => o.value.sec))
          selects.join("\n")
        end

        def time_second(o) select(o.name+'[second]', (0...60),o.value) end
        def time_minute(o) select(o.name+'[minute]', (0...60),o.value) end
        def time_hour(o)   select(o.name+'[hour]', (0...24),o.value) end
        def date_day(o)    select(o.name+'[day]', (1..31),o.value) end
        def date_month(o)  select(o.name+'[month]', (1..12),o.value) end
        def date_year(o)   select(o.name+'[year]', (1950..2050),o.value) end

        def select(name, range, default)
          out = %{<select name="#{name}">\n}
          range.each do |i|
            out << %{  <option value="#{i}"#{' selected="selected"' if default == i}>#{i}</option>\n}
          end
          out << "</select>\n"
        end
      end

    end # Control
  end # FormHelper
end  # Merb