# File:     12_hour_time_select.rb
# Created:  July 16, 2006
# Author:   Andrew Dorr at CubeSix Technologies Inc.
# Wiki:     http://wiki.rubyonrails.org/rails/pages/12+hour+time+select
# Download: http://cubesix.net/rails/plugins/12_hour_time_select/
# 
# Description:
# This is a simple plugin that overrides the default select_time method
# in order to provide support for a 12 hour clock. The 24 hour time 
# functionality is fully retained.
# 
# Use: 
# Copy the 12_hour_time_select directory and its contents to your 
# vendor/plugins/ directory
# In your view, add <%= select_time(datetime, :twelve_hour => true) %>
# 
# For example, when creating a time object in your controller, do like so:
#     @new_job.time = params[:date] + ' ' + 
#       params[:time][:hour] + ':' + 
#       params[:time][:minute] + ' ' + 
#       params[:time][:meridiem]
# 
# Ruby will take care of the rest.
# 
# Credits:
# 
# Based on:
# flex_times by Sean Cribbs (http://wiki.rubyonrails.org/rails/pages/FlexTimes+Plugin)
# 12_hour_time by Nick M.   (http://wiki.rubyonrails.com/rails/pages/12-Hour+Time+Plugin)
# Ruby on Rails DateHelper  (http://api.rubyonrails.com/classes/ActionView/Helpers/DateHelper.html)
# 
# Feel free to do what you will with this code, but credit me if you make 
# changes and rerelease it.

module ActionView::Helpers::DateHelper

  def select_time(datetime = Time.now, options = {})
    if options[:twelve_hour]
      h = select_hour(datetime, options) + select_minute(datetime, options) + select_meridiem(datetime, options) + (options[:include_seconds] ? select_second(datetime, options) : '')
    else
      h = select_hour(datetime, options) + select_minute(datetime, options) + (options[:include_seconds] ? select_second(datetime, options) : '')
    end
  end
  
  def select_hour(datetime, options = {})
    hour_options = []
    
    if options[:twelve_hour]
      first_hour, last_hour = 1, 12
      hr_format = "%I"
    else
      first_hour, last_hour = 0, 23
      hr_format = "%H"
    end
    
    first_hour.upto(last_hour) do |hour|
      time = Time.local(0, 1, 1, ((datetime.kind_of?(Fixnum)) ? datetime : datetime.hour))
      selected = (time.strftime("%H").to_i == hour) ? ' selected="selected"' : ''
      hour_options << %(<option value="#{leading_zero_on_single_digits(hour)}"#{selected}>#{leading_zero_on_single_digits(hour)}</option>\n)
    end
    
    select_html(options[:field_name] || 'hour', hour_options, options[:prefix], options[:include_blank], options[:discard_type], options[:disabled])
  end
  
  def select_meridiem(datetime, options={})
    meridiem_options = []

    ["AM", "PM"].each do |value|
      time = Time.local(0, 1, 1, ((datetime.kind_of?(Fixnum)) ? datetime : datetime.hour))
      selected = (time.strftime("%p") == value) ? ' selected="selected"' : ''
      meridiem_options << %(<option value="#{value}"#{selected}>#{value}</option>\n)
    end

    select_html(options[:field_name] || 'meridiem', meridiem_options, options[:prefix], options[:include_blank], options[:discard_type], options[:disabled])
  end

end