module ActiveRecord
  module Validations
    class UniquenessValidator < ActiveModel::EachValidator # :nodoc:
      def initialize(options)
        if options[:conditions] && !options[:conditions].respond_to?(:call)
          raise ArgumentError, "#{options[:conditions]} was passed as :conditions but is not callable. " \
                               "Pass a callable instead: `conditions: -> { where(approved: true) }`"
        end
        super({ case_sensitive: true }.merge!(options))
      end

      # Unfortunately, we have to tie Uniqueness validators to a class.
      def setup(klass)
        @klass = klass
      end

      def validate_each(record, attribute, value)
        finder_class = find_finder_class_for(record)
        table = finder_class.arel_table
        value = deserialize_attribute(record, attribute, value)

        relation = build_relation(finder_class, table, attribute, value)
        relation = relation.and(table[finder_class.primary_key.to_sym].not_eq(record.id)) if record.persisted?
        relation = scope_relation(record, table, relation)
        relation = finder_class.unscoped.where(relation)
        relation = relation.merge(options[:conditions]) if options[:conditions]

        if relation.exists?
          error_options = options.except(:case_sensitive, :scope, :conditions)
          error_options[:value] = value

          record.errors.add(attribute, :taken, error_options)
        end
      end

    protected

      # The check for an existing value should be run from a class that
      # isn't abstract. This means working down from the current class
      # (self), to the first non-abstract class. Since classes don't know
      # their subclasses, we have to build the hierarchy between self and
      # the record's class.
      def find_finder_class_for(record) #:nodoc:
        class_hierarchy = [record.class]

        while class_hierarchy.first != @klass
          class_hierarchy.unshift(class_hierarchy.first.superclass)
        end

        class_hierarchy.detect { |klass| !klass.abstract_class? }
      end

      def build_relation(klass, table, attribute, value) #:nodoc:
        if reflection = klass.reflect_on_association(attribute)
          attribute = reflection.foreign_key
          value = value.attributes[reflection.primary_key_column.name]
        end

        column = klass.columns_hash[attribute.to_s]
        value  = klass.connection.type_cast(value, column)
        value  = value.to_s[0, column.limit] if value && column.limit && column.text?

        if !options[:case_sensitive] && value && column.text?
          # will use SQL LOWER function before comparison, unless it detects a case insensitive collation
          klass.connection.case_insensitive_comparison(table, attribute, column, value)
        else
          value = klass.connection.case_sensitive_modifier(value) unless value.nil?
          table[attribute].eq(value)
        end
      end

      def scope_relation(record, table, relation)
        Array(options[:scope]).each do |scope_item|
          if reflection = record.class.reflect_on_association(scope_item)
            scope_value = record.send(reflection.foreign_key)
            scope_item  = reflection.foreign_key
          else
            scope_value = record.read_attribute(scope_item)
          end
          relation = relation.and(table[scope_item].eq(scope_value))
        end

        relation
      end

      def deserialize_attribute(record, attribute, value)
        coder = record.class.serialized_attributes[attribute.to_s]
        value = coder.dump value if value && coder
        value
      end
    end

    module ClassMethods
      # Validates whether the value of the specified attributes are unique
      # across the system. Useful for making sure that only one user
      # can be named "davidhh".
      #
      #   class Person < ActiveRecord::Base
      #     validates_uniqueness_of :user_name
      #   end
      #
      # It can also validate whether the value of the specified attributes are
      # unique based on a <tt>:scope</tt> parameter:
      #
      #   class Person < ActiveRecord::Base
      #     validates_uniqueness_of :user_name, scope: :account_id
      #   end
      #
      # Or even multiple scope parameters. For example, making sure that a
      # teacher can only be on the schedule once per semester for a particular
      # class.
      #
      #   class TeacherSchedule < ActiveRecord::Base
      #     validates_uniqueness_of :teacher_id, scope: [:semester_id, :class_id]
      #   end
      #
      # It is also possible to limit the uniqueness constraint to a set of
      # records matching certain conditions. In this example archived articles
      # are not being taken into consideration when validating uniqueness
      # of the title attribute:
      #
      #   class Article < ActiveRecord::Base
      #     validates_uniqueness_of :title, conditions: -> { where.not(status: 'archived') }
      #   end
      #
      # When the record is created, a check is performed to make sure that no
      # record exists in the database with the given value for the specified
      # attribute (that maps to a column). When the record is updated,
      # the same check is made but disregarding the record itself.
      #
      # Configuration options:
      #
      # * <tt>:message</tt> - Specifies a custom error message (default is:
      #   "has already been taken").
      # * <tt>:scope</tt> - One or more columns by which to limit the scope of
      #   the uniqueness constraint.
      # * <tt>:conditions</tt> - Specify the conditions to be included as a
      #   <tt>WHERE</tt> SQL fragment to limit the uniqueness constraint lookup
      #   (e.g. <tt>conditions: -> { where(status: 'active') }</tt>).
      # * <tt>:case_sensitive</tt> - Looks for an exact match. Ignored by
      #   non-text columns (+true+ by default).
      # * <tt>:allow_nil</tt> - If set to +true+, skips this validation if the
      #   attribute is +nil+ (default is +false+).
      # * <tt>:allow_blank</tt> - If set to +true+, skips this validation if the
      #   attribute is blank (default is +false+).
      # * <tt>:if</tt> - Specifies a method, proc or string to call to determine
      #   if the validation should occur (e.g. <tt>if: :allow_validation</tt>,
      #   or <tt>if: Proc.new { |user| user.signup_step > 2 }</tt>). The method,
      #   proc or string should return or evaluate to a +true+ or +false+ value.
      # * <tt>:unless</tt> - Specifies a method, proc or string to call to
      #   determine if the validation should ot occur (e.g. <tt>unless: :skip_validation</tt>,
      #   or <tt>unless: Proc.new { |user| user.signup_step <= 2 }</tt>). The
      #   method, proc or string should return or evaluate to a +true+ or +false+
      #   value.
      #
      # === Concurrency and integrity
      #
      # Using this validation method in conjunction with ActiveRecord::Base#save
      # does not guarantee the absence of duplicate record insertions, because
      # uniqueness checks on the application level are inherently prone to race
      # conditions. For example, suppose that two users try to post a Comment at
      # the same time, and a Comment's title must be unique. At the database-level,
      # the actions performed by these users could be interleaved in the following manner:
      #
      #               User 1                 |               User 2
      #  ------------------------------------+--------------------------------------
      #  # User 1 checks whether there's     |
      #  # already a comment with the title  |
      #  # 'My Post'. This is not the case.  |
      #  SELECT * FROM comments              |
      #  WHERE title = 'My Post'             |
      #                                      |
      #                                      | # User 2 does the same thing and also
      #                                      | # infers that his title is unique.
      #                                      | SELECT * FROM comments
      #                                      | WHERE title = 'My Post'
      #                                      |
      #  # User 1 inserts his comment.       |
      #  INSERT INTO comments                |
      #  (title, content) VALUES             |
      #  ('My Post', 'hi!')                  |
      #                                      |
      #                                      | # User 2 does the same thing.
      #                                      | INSERT INTO comments
      #                                      | (title, content) VALUES
      #                                      | ('My Post', 'hello!')
      #                                      |
      #                                      | # ^^^^^^
      #                                      | # Boom! We now have a duplicate
      #                                      | # title!
      #
      # This could even happen if you use transactions with the 'serializable'
      # isolation level. The best way to work around this problem is to add a unique
      # index to the database table using
      # ActiveRecord::ConnectionAdapters::SchemaStatements#add_index. In the
      # rare case that a race condition occurs, the database will guarantee
      # the field's uniqueness.
      #
      # When the database catches such a duplicate insertion,
      # ActiveRecord::Base#save will raise an ActiveRecord::StatementInvalid
      # exception. You can either choose to let this error propagate (which
      # will result in the default Rails exception page being shown), or you
      # can catch it and restart the transaction (e.g. by telling the user
      # that the title already exists, and asking him to re-enter the title).
      # This technique is also known as
      # {optimistic concurrency control}[http://en.wikipedia.org/wiki/Optimistic_concurrency_control].
      #
      # The bundled ActiveRecord::ConnectionAdapters distinguish unique index
      # constraint errors from other types of database errors by throwing an
      # ActiveRecord::RecordNotUnique exception. For other adapters you will
      # have to parse the (database-specific) exception message to detect such
      # a case.
      #
      # The following bundled adapters throw the ActiveRecord::RecordNotUnique exception:
      #
      # * ActiveRecord::ConnectionAdapters::MysqlAdapter.
      # * ActiveRecord::ConnectionAdapters::Mysql2Adapter.
      # * ActiveRecord::ConnectionAdapters::SQLite3Adapter.
      # * ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.
      def validates_uniqueness_of(*attr_names)
        validates_with UniquenessValidator, _merge_attributes(attr_names)
      end
    end
  end
end