# frozen_string_literal: false

# @!parse
#   class ActiveRecord::Migration
#     # Remove a check constraint from the table
#     #
#     # @param [#to_s] table (nil) The qualified name of the table
#     # @param [#to_s] expression (nil) The SQL expression
#     # @option [Boolean] :if_exists (false) Suppress the error when the constraint is absent
#     # @option [#to_s] :name (nil) The optional name of the constraint
#     # @option [Boolean] :inherit (true) If the constraint should be inherited by subtables
#     # @option [#to_s] :comment (nil) The comment describing the constraint
#     # @yield [c] the block with the constraint's definition
#     # @yieldparam Object receiver of methods specifying the constraint
#     # @return [void]
#     #
#     # Definition for the `drop_check_constraint` operation
#     #
#     # The constraint can be identified by the table and explicit name
#     #
#     #   drop_check_constraint :users, name: "phone_is_long_enough"
#     #
#     # Alternatively the name can be got from the expression.
#     # Be careful! the expression must have exactly the same form
#     # as stored in the database:
#     #
#     #   drop_check_constraint :users, "length((phone::text) > 10)"
#     #
#     # To made operation reversible the expression must be provided:
#     #
#     #   drop_check_constraint "users" do |c|
#     #     c.expression "length((phone::text) > 10)"
#     #     c.inherit false
#     #     c.comment "The phone is 10+ chars long"
#     #   end
#     #
#     # The operation can be called with `if_exists` option.
#     #
#     #   drop_check_constraint :users,
#     #                         name: "phone_is_long_enough",
#     #                         if_exists: true
#     #
#     # In this case the operation is always irreversible due to
#     # uncertainty of the previous state of the database.
#     def drop_check_constraint(table, expression = nil, **options, &block); end
#   end
module PGTrunk::Operations::CheckConstraints
  # @private
  class DropCheckConstraint < Base
    validates :new_name, absence: true

    def to_sql(_version)
      sql = "ALTER TABLE #{table.to_sql} DROP CONSTRAINT"
      sql << " IF EXISTS" if if_exists
      sql << " #{name.name.inspect};"
    end

    def invert
      irreversible!("if_exists: true") if if_exists
      AddCheckConstraint.new(**to_h)
    end
  end
end