require_relative '../../spec_helper'

ruby_version_is ""..."3.4" do
  require 'bigdecimal'

  describe "BigDecimal#<=" do
    before :each do
      @zero = BigDecimal("0")
      @zero_pos = BigDecimal("+0")
      @zero_neg = BigDecimal("-0")
      @mixed = BigDecimal("1.23456789")
      @pos_int = BigDecimal("2E5555")
      @neg_int = BigDecimal("-2E5555")
      @pos_frac = BigDecimal("2E-9999")
      @neg_frac = BigDecimal("-2E-9999")

      @int_mock = mock('123')
      class << @int_mock
        def coerce(other)
          return [other, BigDecimal('123')]
        end
        def <=(other)
          BigDecimal('123') <= other
        end
      end

      @values = [@mixed, @pos_int, @neg_int, @pos_frac, @neg_frac,
        -2**32, -2**31, -2**30, -2**16, -2**8, -100, -10, -1,
        @zero , 1, 2, 10, 10.5, 2**8, 2**16, 2**32, @int_mock, @zero_pos, @zero_neg]

      @infinity = BigDecimal("Infinity")
      @infinity_neg = BigDecimal("-Infinity")

      @float_infinity = Float::INFINITY
      @float_infinity_neg = -Float::INFINITY

      @nan = BigDecimal("NaN")
    end

    it "returns true if a <= b" do
      one = BigDecimal("1")
      two = BigDecimal("2")

      frac_1 = BigDecimal("1E-99999")
      frac_2 = BigDecimal("0.9E-99999")

      (@zero <= one).should == true
      (two <= @zero).should == false

      (frac_2 <= frac_1).should == true
      (two <= two).should == true
      (frac_1 <= frac_1).should == true

      (@neg_int <= @pos_int).should == true
      (@pos_int <= @neg_int).should == false
      (@neg_int <= @pos_frac).should == true
      (@pos_frac <= @neg_int).should == false
      (@zero <= @zero_pos).should == true
      (@zero <= @zero_neg).should == true
      (@zero_neg <= @zero_pos).should == true
      (@zero_pos <= @zero_neg).should == true
    end

    it "properly handles infinity values" do
      @values.each { |val|
        (val <= @infinity).should == true
        (@infinity <= val).should == false
        (val <= @infinity_neg).should == false
        (@infinity_neg <= val).should == true
      }
      (@infinity <= @infinity).should == true
      (@infinity_neg <= @infinity_neg).should == true
      (@infinity <= @infinity_neg).should == false
      (@infinity_neg <= @infinity).should == true
    end

    it "properly handles Float infinity values" do
      @values.each { |val|
        (val <= @float_infinity).should == true
        (@float_infinity <= val).should == false
        (val <= @float_infinity_neg).should == false
        (@float_infinity_neg <= val).should == true
      }
    end

    it "properly handles NaN values" do
      @values += [@infinity, @infinity_neg, @nan]
      @values.each { |val|
        (@nan <= val).should == false
        (val <= @nan).should == false
      }
    end

    it "raises an ArgumentError if the argument can't be coerced into a BigDecimal" do
      -> {@zero         <= nil }.should raise_error(ArgumentError)
      -> {@infinity     <= nil }.should raise_error(ArgumentError)
      -> {@infinity_neg <= nil }.should raise_error(ArgumentError)
      -> {@mixed        <= nil }.should raise_error(ArgumentError)
      -> {@pos_int      <= nil }.should raise_error(ArgumentError)
      -> {@neg_frac     <= nil }.should raise_error(ArgumentError)
    end
  end
end
