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# redMine - project management software

# Copyright (C) 2006  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

# 

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

class CustomField < ActiveRecord::Base

  has_many :custom_values, :dependent => :delete_all

  acts_as_list :scope => 'type = \'#{self.class}\''

  serialize :possible_values

  validates_presence_of :name, :field_format

  validates_uniqueness_of :name, :scope => :type

  validates_length_of :name, :maximum => 30

  validates_format_of :name, :with => /^[\w\s\.\'\-]*$/i

  validates_inclusion_of :field_format, :in => Redmine::CustomFieldFormat.available_formats

  def initialize(attributes = nil)

    super

    self.possible_values ||= []

  end

  def before_validation

    # make sure these fields are not searchable

    self.searchable = false if %w(int float date bool).include?(field_format)

    true

  end

  def validate

    if self.field_format == "list"

      errors.add(:possible_values, :blank) if self.possible_values.nil? || self.possible_values.empty?

      errors.add(:possible_values, :invalid) unless self.possible_values.is_a? Array

    end

    # validate default value

    v = CustomValue.new(:custom_field => self.clone, :value => default_value, :customized => nil)

    v.custom_field.is_required = false

    errors.add(:default_value, :invalid) unless v.valid?

  end

  # Makes possible_values accept a multiline string

  def possible_values=(arg)

    if arg.is_a?(Array)

      write_attribute(:possible_values, arg.compact.collect(&:strip).select {|v| !v.blank?})

    else

      self.possible_values = arg.to_s.split(/[\n\r]+/)

    end

  end

  def cast_value(value)

    casted = nil

    unless value.blank?

      case field_format

      when 'string', 'text', 'list'

        casted = value

      when 'date'

        casted = begin; value.to_date; rescue; nil end

      when 'bool'

        casted = (value == '1' ? true : false)

      when 'int'

        casted = value.to_i

      when 'float'

        casted = value.to_f

      end

    end

    casted

  end

  # Returns a ORDER BY clause that can used to sort customized

  # objects by their value of the custom field.

  # Returns false, if the custom field can not be used for sorting.

  def order_statement

    case field_format

      when 'string', 'text', 'list', 'date', 'bool'

        # COALESCE is here to make sure that blank and NULL values are sorted equally

        "COALESCE((SELECT cv_sort.value FROM #{CustomValue.table_name} cv_sort" + 

          " WHERE cv_sort.customized_type='#{self.class.customized_class.name}'" +

          " AND cv_sort.customized_id=#{self.class.customized_class.table_name}.id" +

          " AND cv_sort.custom_field_id=#{id} LIMIT 1), '')"

      when 'int', 'float'

        # Make the database cast values into numeric

        # Postgresql will raise an error if a value can not be casted!

        # CustomValue validations should ensure that it doesn't occur

        "(SELECT CAST(cv_sort.value AS decimal(60,3)) FROM #{CustomValue.table_name} cv_sort" + 

          " WHERE cv_sort.customized_type='#{self.class.customized_class.name}'" +

          " AND cv_sort.customized_id=#{self.class.customized_class.table_name}.id" +

          " AND cv_sort.custom_field_id=#{id} AND cv_sort.value <> '' AND cv_sort.value IS NOT NULL LIMIT 1)"

      else

        nil

    end

  end

  def <=>(field)

    position <=> field.position

  end

  def self.customized_class

    self.name =~ /^(.+)CustomField$/

    begin; $1.constantize; rescue nil; end

  end

  # to move in project_custom_field

  def self.for_all

    find(:all, :conditions => ["is_for_all=?", true], :order => 'position')

  end

  def type_name

    nil

  end

end