# frozen_string_literal: true

class KeyVortex
  class Limitation
    attr_reader :type, :constraints

    def initialize(type, *constraints)
      @type = type
      @constraints = constraints
    end

    def add_constraint(*constraints)
      constraints.each do |constraint|
        unless constraint.is_a?(KeyVortex::Constraint::Base)
          raise KeyVortex::Error,
                "Not a constraint: #{constraint.class}"
        end
      end

      @constraints += constraints
    end

    def encompasses?(limitation)
      @constraints.all? do |constraint|
        limitation.encompasses_constraint?(constraint)
      end
    end

    def encompasses_constraint?(constraint)
      applicable_constraints(constraint).any? do |con|
        con.within?(constraint)
      end
    end

    def within?(limitation)
      limitation.constraints.all? do |constraint|
        within_constraint?(constraint)
      end
    end

    def within_constraint?(constraint)
      applicable_constraints(constraint).any? do |con|
        con.within?(constraint)
      end
    end

    def applicable_constraints(constraint)
      @constraints.select do |con|
        con.applies_to?(constraint)
      end
    end

    def accepts?(value)
      value.is_a?(type) && @constraints.all? { |constraint| constraint.accepts?(value) }
    end

    JSON_ADDITIONS = {
      BigDecimal: "json/add/bigdecimal",
      Complex: "json/add/complex",
      Date: "json/add/date",
      DateTime: "json/add/date_time",
      Exception: "json/add/exception",
      OpenStruct: "json/add/ostruct",
      Range: "json/add/range",
      Rational: "json/add/rational",
      Regexp: "json/add/regexp",
      Set: "json/add/set",
      Struct: "json/add/struct",
      Symbol: "json/add/symbol",
      Time: "json/add/time"
    }.freeze

    def enable_json_additions
      path = JSON_ADDITIONS[@type.class.name]
      require path if path
    end

    def to_s
      "Limitation: #{@type}\n\t#{@constraints.join('\n\t')}"
    end
  end
end