// Copyright 2016 Dolphin Emulator Project / 2017 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#include <catch2/catch.hpp>

#include <array>
#include <bitset>
#include <string>
#include "common/file_util.h"
#include "core/core.h"
#include "core/core_timing.h"

// Numbers are chosen randomly to make sure the correct one is given.
static constexpr std::array<u64, 5> CB_IDS{{42, 144, 93, 1026, UINT64_C(0xFFFF7FFFF7FFFF)}};
static constexpr int MAX_SLICE_LENGTH = 20000; // Copied from CoreTiming internals

static std::bitset<CB_IDS.size()> callbacks_ran_flags;
static u64 expected_callback = 0;
static s64 lateness = 0;

template <unsigned int IDX>
void CallbackTemplate(u64 userdata, s64 cycles_late) {
    static_assert(IDX < CB_IDS.size(), "IDX out of range");
    callbacks_ran_flags.set(IDX);
    REQUIRE(CB_IDS[IDX] == userdata);
    REQUIRE(CB_IDS[IDX] == expected_callback);
    REQUIRE(lateness == cycles_late);
}

struct ScopeInit final {
    ScopeInit() {
        core_timing.Initialize();
    }
    ~ScopeInit() {
        core_timing.Shutdown();
    }

    Core::Timing::CoreTiming core_timing;
};

static void AdvanceAndCheck(Core::Timing::CoreTiming& core_timing, u32 idx, int downcount,
                            int expected_lateness = 0, int cpu_downcount = 0) {
    callbacks_ran_flags = 0;
    expected_callback = CB_IDS[idx];
    lateness = expected_lateness;

    // Pretend we executed X cycles of instructions.
    core_timing.AddTicks(core_timing.GetDowncount() - cpu_downcount);
    core_timing.Advance();

    REQUIRE(decltype(callbacks_ran_flags)().set(idx) == callbacks_ran_flags);
    REQUIRE(downcount == core_timing.GetDowncount());
}