require "spec"
require "../src/list.cr"

describe "DoubleLinkedList" do
	it "add and remove values" do
		list = DoubleLinkedList(Int32).new
		list.push 1
		list.to_s.should eq "[ 1 ]"
		list.push 2
		list.to_s.should eq "[ 1, 2 ]"
		list << 3 << 4
		list.to_s.should eq "[ 1, 2, 3, 4 ]"
		list.insert_at(8, 1)
		list.to_s.should eq "[ 1, 8, 2, 3, 4 ]"
		list.insert_at(0, 0)
		list.to_s.should eq "[ 0, 1, 8, 2, 3, 4 ]"
		list.insert_at(5, 6)
		list.to_s.should eq "[ 0, 1, 8, 2, 3, 4, 5 ]"
		v = list.pop
		v.value.should eq 5
		list.to_s.should eq "[ 0, 1, 8, 2, 3, 4 ]"
		v = list.pop
		v.value.should eq 4
		list.to_s.should eq "[ 0, 1, 8, 2, 3 ]"
		v = list.pop
		v.value.should eq 3
		list.to_s.should eq "[ 0, 1, 8, 2 ]"
		v = list.pop
		v.value.should eq 2
		list.to_s.should eq "[ 0, 1, 8 ]"
		v = list.pop
		v.value.should eq 8
		list.to_s.should eq "[ 0, 1 ]"
		v = list.pop
		v.value.should eq 1
		list.to_s.should eq "[ 0 ]"
		v = list.pop
		v.value.should eq 0
		list.to_s.should eq "[  ]"

		expect_raises DoubleLinkedList::OutOfBounds do
			list.pop
		end

		expect_raises DoubleLinkedList::OutOfBounds do
			list[0]
		end

		list.size.should eq 0
	end

	it "insert_at" do
		list = DoubleLinkedList(Int32).new
		list.insert_at 2, 0
		list.insert_at 1, 0
		list.insert_at 3, 2
		list.insert_at 0, 0
		list.to_s.should eq "[ 0, 1, 2, 3 ]"
	end

	it "reverse" do
		list = DoubleLinkedList(Int32).new
		list.reverse.to_s.should eq "[  ]"
		list << 1 << 2 << 3 << 4
		list.reverse.to_s.should eq "[ 4, 3, 2, 1 ]"
	end

	it "concat" do
		list1 = DoubleLinkedList(Int32).new
		list2 = DoubleLinkedList(Int32).new
		list1 << 1 << 2
		list2 << 3 << 4
		list1.concat list2
		list1.to_s.should eq "[ 1, 2, 3, 4 ]"
	end

	it "+" do
		list1 = DoubleLinkedList(Int32).new
		list2 = DoubleLinkedList(Int32).new
		list1 << 1 << 2
		list2 << 3 << 4
		list3 = list1 + list2
		list1.to_s.should eq "[ 1, 2 ]"
		list2.to_s.should eq "[ 3, 4 ]"
		list3.to_s.should eq "[ 1, 2, 3, 4 ]"
	end

	it "shift" do
		list = DoubleLinkedList(Int32).new
		list << 1 << 2 << 3 << 4
		list.shift.value.should eq 1
		list.shift.value.should eq 2
		list.shift.value.should eq 3
		list.shift.value.should eq 4
	end

	it "peek" do
		list = DoubleLinkedList(Int32).new
		list << 1 << 2 << 3 << 4
		list.peek.value.should eq 4
		list.pop
		list.peek.value.should eq 3
	end
end