// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
// SPDX-License-Identifier: BSD-3-Clause

package lint

import (
	"testing"

	"sourcedock.dev/petrbalvin/gasm-devkit/asm"
)

func TestUnencodableInstruction(t *testing.T) {
	// MOVBE is a real x86 instruction the architecture table knows about;
	// before the encoder grows it, lint must flag the gap at edit time.
	diags := lintSrc(t, `
#include "textflag.h"
TEXT ·f(SB), NOSPLIT, $0
	MOVQ AX, BX
	RET
`)
	if codes(diags)[CodeUnencodable] != 0 {
		t.Fatalf("encodable instructions must not be flagged: %+v", diags)
	}

	// A mnemonic that is neither in the table nor encodable fires
	// unknown-instruction, not unencodable.
	diags = lintSrc(t, `
#include "textflag.h"
TEXT ·f(SB), NOSPLIT, $0
	FROBNICATE AX, BX
	RET
`)
	if codes(diags)[CodeUnencodable] != 0 || codes(diags)[CodeUnknownInstr] != 1 {
		t.Fatalf("unknown instruction must fire unknown-instruction only: %+v", diags)
	}
}

func TestEncodableMirror(t *testing.T) {
	// Spot-check the predicate against instructions from every dispatch
	// family of the encoder.
	yes := []string{
		"RET", "NOP", "CALL", "JMP", "JEQ", "JLT",
		"MOVQ", "MOVL", "ADDQ", "CMPQ", "LEAQ", "TESTL",
		"NOTL", "DECL", "SHRQ", "IMULQ", "PUSHQ", "POPQ",
		"BSWAPL", "TZCNTQ", "MOVBLZX", "MOVOU", "MOVSD",
		"PREFETCHT0", "PREFETCHNTA",
		"VMOVDQU", "VPCMPUB", "VPCOMPRESSD", "VPERMB", "VPGATHERDD", "VPSCATTERDD",
		"KMOVQ", "KANDNW", "VPMOVMSKB",
		"CMOVLGT", "SETNE", "PSHUFB", "PADDB",
	}
	for _, m := range yes {
		if !asm.Encodable(m) {
			t.Errorf("Encodable(%q) = false, want true", m)
		}
	}
	no := []string{"FROBNICATE", "MOVXX", "CMOVXX", "SETXX"}
	for _, m := range no {
		if asm.Encodable(m) {
			t.Errorf("Encodable(%q) = true, want false", m)
		}
	}
}