package z80

import "testing"

// 16-bit loads and increments/decrements.
func TestLD_rp_nn_AND_INC_DEC_rp(t *testing.T) {
	cpu, mem, _ := testCPU()
	loadProgram(cpu, mem, 0x0000,
		0x01, 0x34, 0x12, // LD BC,1234
		0x11, 0x78, 0x56, // LD DE,5678
		0x21, 0xCD, 0xAB, // LD HL,ABCD
		0x31, 0xFE, 0xFF, // LD SP,FFFE
		0x03, // INC BC
		0x13, // INC DE
		0x23, // INC HL
		0x33, // INC SP
		0x0B, // DEC BC
		0x1B, // DEC DE
		0x2B, // DEC HL
		0x3B, // DEC SP
	)

	c := mustStep(t, cpu)
	assertEq(t, c, 10, "LD BC,nn cycles")
	assertEq(t, cpu.GetBC(), uint16(0x1234), "LD BC")
	c = mustStep(t, cpu)
	assertEq(t, c, 10, "LD DE,nn cycles")
	assertEq(t, cpu.GetDE(), uint16(0x5678), "LD DE")
	c = mustStep(t, cpu)
	assertEq(t, c, 10, "LD HL,nn cycles")
	assertEq(t, cpu.GetHL(), uint16(0xABCD), "LD HL")
	c = mustStep(t, cpu)
	assertEq(t, c, 10, "LD SP,nn cycles")
	assertEq(t, cpu.SP, uint16(0xFFFE), "LD SP")

	assertEq(t, mustStep(t, cpu), 6, "INC BC cycles")
	assertEq(t, cpu.GetBC(), uint16(0x1235), "INC BC")
	assertEq(t, mustStep(t, cpu), 6, "INC DE cycles")
	assertEq(t, cpu.GetDE(), uint16(0x5679), "INC DE")
	assertEq(t, mustStep(t, cpu), 6, "INC HL cycles")
	assertEq(t, cpu.GetHL(), uint16(0xABCE), "INC HL")
	assertEq(t, mustStep(t, cpu), 6, "INC SP cycles")
	assertEq(t, cpu.SP, uint16(0xFFFF), "INC SP")

	assertEq(t, mustStep(t, cpu), 6, "DEC BC cycles")
	assertEq(t, cpu.GetBC(), uint16(0x1234), "DEC BC")
	assertEq(t, mustStep(t, cpu), 6, "DEC DE cycles")
	assertEq(t, cpu.GetDE(), uint16(0x5678), "DEC DE")
	assertEq(t, mustStep(t, cpu), 6, "DEC HL cycles")
	assertEq(t, cpu.GetHL(), uint16(0xABCD), "DEC HL")
	assertEq(t, mustStep(t, cpu), 6, "DEC SP cycles")
	assertEq(t, cpu.SP, uint16(0xFFFE), "DEC SP")
}