// Copyright 2026 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later

#include <gtest/gtest.h>

#include "Core/Core.h"
#include "Core/HW/WII_IPC.h"
#include "Core/System.h"

namespace IOS
{
namespace
{
constexpr u32 PPCCTRL = 0x04;
constexpr u32 ARMCTRL = 0x0c;
constexpr u32 ARM_IRQMASK = 0x3c;
constexpr u32 IX1 = 0x10;
constexpr u32 X1 = 0x01;

WiiIPC& Fresh(bool attached)
{
  Core::DeclareAsCPUThread();
  auto& ipc = Core::System::GetInstance().GetWiiIPC();
  ipc.Reset();
  ipc.SetStarletAttached(attached);
  ipc.WriteStarletRegister(ARM_IRQMASK, INT_CAUSE_IPC_STARLET);
  return ipc;
}

TEST(StarletProbeInterrupt, WithoutTheFlagX1NeverReachesTheStarlet)
{
  // master's behaviour, with no Starlet object in the system.
  auto& ipc = Fresh(false);
  ipc.WriteStarletRegister(ARMCTRL, IX1);
  ipc.WriteStarletRegister(PPCCTRL, X1);
  EXPECT_FALSE(ipc.IsStarletIRQAsserted());
}

TEST(StarletProbeInterrupt, WithTheFlagTheModelRaisesItOnX1AndIX1)
{
  auto& ipc = Fresh(true);
  ipc.WriteStarletRegister(ARMCTRL, IX1);
  EXPECT_FALSE(ipc.IsStarletIRQAsserted());
  ipc.WriteStarletRegister(PPCCTRL, X1);
  EXPECT_TRUE(ipc.IsStarletIRQAsserted());
}

TEST(StarletProbeInterrupt, WithoutIX1TheCauseWaitsForIt)
{
  auto& ipc = Fresh(true);
  ipc.WriteStarletRegister(PPCCTRL, X1);
  EXPECT_FALSE(ipc.IsStarletIRQAsserted());
  // The same model line, on the Starlet's first ARMCTRL write.
  ipc.WriteStarletRegister(ARMCTRL, IX1);
  EXPECT_TRUE(ipc.IsStarletIRQAsserted());
}

TEST(StarletProbeInterrupt, ResetClearsTheFlag)
{
  auto& ipc = Fresh(true);
  ipc.Reset();
  ipc.WriteStarletRegister(ARM_IRQMASK, INT_CAUSE_IPC_STARLET);
  ipc.WriteStarletRegister(ARMCTRL, IX1);
  ipc.WriteStarletRegister(PPCCTRL, X1);
  EXPECT_FALSE(ipc.IsStarletIRQAsserted());
}
}  // namespace
}  // namespace IOS