module ForestLiana
  class OperatorValueParser

    def self.parse(value)
      operator = nil
      value_comparison = nil

      if value.first == '!'
        operator = '!='
        value_comparison = value[1..-1]
      elsif value.first == '>'
        operator = '>'
        value_comparison = value[1..-1]
      elsif value.first == '<'
        operator = '<'
        value_comparison = value[1..-1]
      elsif value.include?('*')
        operator = 'LIKE'
        value_comparison = value.gsub('*', '%')
      elsif value === '$present'
        operator = 'IS NOT NULL'
        value_comparison = nil
      elsif value === '$blank'
        operator = 'IS NULL'
        value_comparison = nil
      else
        operator = '='
        value_comparison = value
      end

      [operator, value_comparison]
    end

    def self.get_condition(field, operator, value, resource, timezone)
      field_name = self.get_field_name(field, resource)

      operator_date_interval_parser = OperatorDateIntervalParser
        .new(value, timezone)

      if operator_date_interval_parser.is_interval_date_value()
        filter = operator_date_interval_parser.get_interval_date_filter()
        "#{field_name} #{filter}"
      else
        # NOTICE: Set the integer value instead of a string if "enum" type
        # NOTICE: Rails 3 do not have a defined_enums method
        if resource.respond_to?(:defined_enums) &&
          resource.defined_enums.has_key?(field)
          value = resource.defined_enums[field][value]
        end

        where = "#{field_name} #{operator}"
        where += " #{self.format_value(resource, field, value)}" if value
        where
      end
    end

    def self.get_field_name(field, resource)
      if field.split(':').size < 2
        "#{resource.quoted_table_name}." +
        "#{ActiveRecord::Base.connection.quote_column_name(field)}"
      else
        association = field.split(':')[0].pluralize
        "#{ActiveRecord::Base.connection.quote_column_name(association)}." +
        "#{ActiveRecord::Base.connection.quote_column_name(field.split(':')[1])}"
      end
    end

    def self.format_value(resource, field, value)
      column = resource.columns.find { |c| c.name == field }
      if column.type == :boolean
        ForestLiana::AdapterHelper.cast_boolean(value)
      else
        "'#{value}'"
      end
    end

  end
end