package chip8

import (
	"testing"
)

func slicesEqual(x, y []uint8) bool {
	if len(x) != len(y) {
		return false
	}
	for i, xi := range x {
		if xi != y[i] {
			return false
		}
	}
	return true
}

// This test is kinda shit, there's so much stuff we ain't testing
// Maybe fix
func TestCreateCPU(t *testing.T) {
	prog := []uint8{1, 2, 3, 4}
	new_cpu := NewCHIP8(prog)
	if !slicesEqual(new_cpu.memory[200:204], prog) {
		t.Errorf("CPU not initalized properly")
	}
}

func TestClearDisplay(t *testing.T) {
	cpu := Chip8{}
	for i := range cpu.graphics {
		cpu.graphics[i] = uint8(i % 255)
	}
	cpu.clearDisplay()
	graphics_array := cpu.GetGraphicsBuffer()
	graphics_slice := graphics_array[:]
	empty_slice := make([]uint8, len(cpu.graphics))
	if !slicesEqual(graphics_slice, empty_slice) {
		t.Errorf("Graphics buffer not cleared properly")
	}
}

func TestLeaveFunction(t *testing.T) {
	cpu := Chip8{pc: 50}
	cpu.stack = append(cpu.stack, 1, 2, 3, 4, 5)
	cpu.leaveFunction()
	if cpu.pc != 4 && len(cpu.stack) != 4 {
		t.Errorf("TestLeaveFunction not in expected state")
	}
}

func TestPasses(t *testing.T) {
	if 1 != 1 {
		t.Errorf("We should never get this!")
	}
}