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

package verify

import (
	"runtime"
	"testing"
)

// requireArchHost skips unless the test binary runs on the named GOARCH: the
// JIT executes native code, so an arm64 kernel only runs on an arm64 CPU
// (real hardware or qemu-user emulation).
func requireArchHost(t *testing.T, goarch string) {
	t.Helper()
	if runtime.GOARCH != goarch {
		t.Skipf("runs only on %s hosts (this host is %s)", goarch, runtime.GOARCH)
	}
}

// TestPlainCallArm64 checks the bare JIT call path (no ABI sentinels) on
// arm64: the trampoline, the kernel and the result read-back.
func TestPlainCallArm64(t *testing.T) {
	requireArchHost(t, "arm64")

	k, err := Load("../testdata/verify/abi_arm64.s")
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	t.Cleanup(k.Close)

	args := make([]byte, 24)
	PutUint64(args, 0, 3)
	PutUint64(args, 8, 4)
	out, err := k.CallFunc("cleanAdd", args)
	if err != nil {
		t.Fatalf("CallFunc: %v", err)
	}
	if got := int64(GetUint64(out, 16)); got != 7 {
		t.Errorf("cleanAdd(3, 4) = %d, want 7", got)
	}
}

// TestPlainCallRiscv64 is TestPlainCallArm64 for riscv64.
func TestPlainCallRiscv64(t *testing.T) {
	requireArchHost(t, "riscv64")

	k, err := Load("../testdata/verify/abi_riscv64.s")
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	t.Cleanup(k.Close)

	args := make([]byte, 24)
	PutUint64(args, 0, 3)
	PutUint64(args, 8, 4)
	out, err := k.CallFunc("cleanAdd", args)
	if err != nil {
		t.Fatalf("CallFunc: %v", err)
	}
	if got := int64(GetUint64(out, 16)); got != 7 {
		t.Errorf("cleanAdd(3, 4) = %d, want 7", got)
	}
}

// TestPlainCallLoong64 is TestPlainCallArm64 for loong64.
func TestPlainCallLoong64(t *testing.T) {
	requireArchHost(t, "loong64")

	k, err := Load("../testdata/verify/abi_loong64.s")
	if err != nil {
		t.Fatalf("Load: %v", err)
	}
	t.Cleanup(k.Close)

	args := make([]byte, 24)
	PutUint64(args, 0, 3)
	PutUint64(args, 8, 4)
	out, err := k.CallFunc("cleanAdd", args)
	if err != nil {
		t.Fatalf("CallFunc: %v", err)
	}
	if got := int64(GetUint64(out, 16)); got != 7 {
		t.Errorf("cleanAdd(3, 4) = %d, want 7", got)
	}
}