require_relative '../../spec_helper'
require_relative 'fixtures/classes'

describe "Hash#[]=" do
  it "associates the key with the value" do
    h = { a: 1 }
    h[:b] = 2
    h.should == { b:2, a:1 }
  end

  it "returns the assigned value" do
    h = {}
    h.send(:[]=, 1, 2).should == 2
  end

  it "duplicates string keys using dup semantics" do
    # dup doesn't copy singleton methods
    key = +"foo"
    def key.reverse() "bar" end
    h = {}
    h[key] = 0
    h.keys[0].reverse.should == "oof"
  end

  it "stores unequal keys that hash to the same value" do
    h = {}
    k1 = ["x"]
    k2 = ["y"]
    # So they end up in the same bucket
    k1.should_receive(:hash).and_return(0)
    k2.should_receive(:hash).and_return(0)

    h[k1] = 1
    h[k2] = 2
    h.size.should == 2
  end

  it "accepts keys with private #hash method" do
    key = HashSpecs::KeyWithPrivateHash.new
    h = {}
    h[key] = "foo"
    h[key].should == "foo"
  end

  it " accepts keys with an Integer hash" do
    o = mock(hash: 1 << 100)
    h = {}
    h[o] = 1
    h[o].should == 1
  end

  it "duplicates and freezes string keys" do
    key = +"foo"
    h = {}
    h[key] = 0
    key << "bar"

    h.should == { "foo" => 0 }
    h.keys[0].should.frozen?
  end

  it "doesn't duplicate and freeze already frozen string keys" do
    key = "foo".freeze
    h = {}
    h[key] = 0
    h.keys[0].should.equal?(key)
  end

  it "keeps the existing key in the hash if there is a matching one" do
    h = { "a" => 1, "b" => 2, "c" => 3, "d" => 4 }
    key1 = HashSpecs::ByValueKey.new(13)
    key2 = HashSpecs::ByValueKey.new(13)
    h[key1] = 41
    key_in_hash = h.keys.last
    key_in_hash.should.equal?(key1)
    h[key2] = 42
    last_key = h.keys.last
    last_key.should.equal?(key_in_hash)
    last_key.should_not.equal?(key2)
  end

  it "keeps the existing String key in the hash if there is a matching one" do
    h = { "a" => 1, "b" => 2, "c" => 3, "d" => 4 }
    key1 = "foo".dup
    key2 = "foo".dup
    key1.should_not.equal?(key2)
    h[key1] = 41
    frozen_key = h.keys.last
    frozen_key.should_not.equal?(key1)
    h[key2] = 42
    h.keys.last.should.equal?(frozen_key)
    h.keys.last.should_not.equal?(key2)
  end

  it "raises a FrozenError if called on a frozen instance" do
    -> { HashSpecs.frozen_hash[1] = 2 }.should.raise(FrozenError)
  end

  it "does not raise an exception if changing the value of an existing key during iteration" do
    hash = {1 => 2, 3 => 4, 5 => 6}
    hash.each { hash[1] = :foo }
    hash.should == {1 => :foo, 3 => 4, 5 => 6}
  end

  it "does not dispatch to hash for Boolean, Integer, Float, String, or Symbol" do
    code = <<-EOC
      load '#{fixture __FILE__, "name.rb"}'
      hash = {}
      [true, false, 1, 2.0, "hello", :ok].each do |value|
        hash[value] = 42
        raise "incorrect value" unless hash[value] == 42
        hash[value] = 43
        raise "incorrect value" unless hash[value] == 43
      end
      puts "OK"
      puts hash.size
    EOC
    result = ruby_exe(code, args: "2>&1")
    result.should == "OK\n6\n"
  end
end
