typedef HRESULT W32_SetThreadDescription_Type(HANDLE hThread, PCWSTR lpThreadDescription);

#define W32_KERNEL32_EXT_X_LIST X(SetThreadDescription)

#define X(x) global W32_##x##_Type* w32_##x##_func;
W32_KERNEL32_EXT_X_LIST
#undef X

// =============================================================================
// Entity Functions

internal W32_Entity* w32_entity_alloc(W32_EntityKind kind)
{
    W32_Entity* result = 0;
    EnterCriticalSection(&w32_state.entity_mutex);
    {
        result = w32_state.entity_free;
        if (result)
        {
            SLL_stack_pop(w32_state.entity_free);
        }
        else
        {
            result = push_array_no_zero(w32_state.entity_arena, W32_Entity, 1);
        }
        MemoryZeroStruct(result);
    }
    LeaveCriticalSection(&w32_state.entity_mutex);
    result->kind = kind;
    return result;
}

internal void w32_entity_release(W32_Entity* entity)
{
    entity->kind = W32_EntityKind_Null;
    EnterCriticalSection(&w32_state.entity_mutex);
    SLL_stack_push(w32_state.entity_free, entity);
    LeaveCriticalSection(&w32_state.entity_mutex);
}

// =============================================================================
// Time functions

internal uint64 now_time_us()
{
    uint64        result = 0;
    LARGE_INTEGER large_int_counter;
    if (QueryPerformanceCounter(&large_int_counter))
    {
        result = (large_int_counter.QuadPart * Million(1)) / w32_state.microsecond_resolution;
    }
    return result;
}

internal void sleep_ms(uint32 ms)
{
    Sleep(ms);
}

// =============================================================================
// System

internal SystemInfo* get_system_info()
{
    return &w32_state.system_info;
}

// =============================================================================
// Thread Info

internal uint32 tid()
{
    DWORD id = GetCurrentThreadId();
    return (uint32)id;
}

internal void set_platform_thread_name(String8 name)
{
    TempArena scratch = scratch_begin(0, 0);

    // Win10 and +
    if (w32_SetThreadDescription_func)
    {
        String16 name16 = str16_from_8(scratch.arena, name);
        HRESULT  hr     = w32_SetThreadDescription_func(GetCurrentThread(), (WCHAR*)name16.str);
    }

    // Old way by raising exception
    {
        String8 name_copy = str8_copy(scratch.arena, name);
#pragma pack(push, 8)
        typedef struct THREADNAME_INFO THREADNAME_INFO;
        struct THREADNAME_INFO
        {
            uint32 dwType;     // Must be 0x1000.
            char*  szName;     // Pointer to name (in user addr space).
            uint32 dwThreadID; // Thread ID (-1=caller thread).
            uint32 dwFlags;    // Reserved for future use, must be zero.
        };
#pragma pack(pop)
        THREADNAME_INFO info;
        info.dwType     = 0x1000;
        info.szName     = (char*)name_copy.str;
        info.dwThreadID = tid();
        info.dwFlags    = 0;
#pragma warning(push)
#pragma warning(disable : 6320 6322)
        __try
        {
            RaiseException(0x406D1388, 0, sizeof(info) / sizeof(void*), (const ULONG_PTR*)&info);
        }
        __except (EXCEPTION_EXECUTE_HANDLER)
        {
        }
#pragma warning(pop)
    }
    scratch_end(scratch);
}

// =============================================================================
// Synchronization primitive functions

// read write mutexes

internal RWMutex rw_mutex_alloc()
{
    W32_Entity* entity = w32_entity_alloc(W32_EntityKind_RWMutex);
    InitializeSRWLock(&entity->rw_mutex);
    RWMutex result = { IntFromPtr(entity) };
    return result;
}

internal void rw_mutex_release(RWMutex rw_mutex)
{
    W32_Entity* entity = (W32_Entity*)PtrFromInt(rw_mutex.handle[0]);
    w32_entity_release(entity);
}

internal void rw_mutex_take(RWMutex rw_mutex, bool32 write_mode)
{
    W32_Entity* entity = (W32_Entity*)PtrFromInt(rw_mutex.handle[0]);
    if (write_mode)
    {
        AcquireSRWLockExclusive(&entity->rw_mutex);
    }
    else
    {
        AcquireSRWLockShared(&entity->rw_mutex);
    }
}

internal void rw_mutex_drop(RWMutex rw_mutex, bool32 write_mode)
{
    W32_Entity* entity = (W32_Entity*)PtrFromInt(rw_mutex.handle[0]);
    if (write_mode)
    {
        ReleaseSRWLockExclusive(&entity->rw_mutex);
    }
    else
    {
        ReleaseSRWLockShared(&entity->rw_mutex);
    }
}

// =============================================================================
// Memory

internal void* reserve_memory(uint64 size)
{
    void* result = VirtualAlloc(0, size, MEM_RESERVE, PAGE_READWRITE);
    return result;
}

internal bool32 commit_memory(void* ptr, uint64 size)
{
    bool32 result = (VirtualAlloc(ptr, size, MEM_COMMIT, PAGE_READWRITE) != 0);
    return result;
}

internal void* reserve_memory_large(uint64 size)
{
    // Windows do not allow commiting large pages
    void* result = VirtualAlloc(0, size, MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES, PAGE_READWRITE);
    return result;
}

internal bool32 commit_memory_large(void* ptr, uint64 size)
{
    (void)ptr;
    (void)size;
    return 1;
}

internal void decommit_memory(void* ptr, uint64 size)
{
    VirtualFree(ptr, size, MEM_DECOMMIT);
}

internal void release_memory(void* ptr, uint64 size)
{
    (void)size; // Unused on windows
    VirtualFree(ptr, 0, MEM_RELEASE);
}

// =============================================================================
// Aborting

internal void abort_self(uint64 exit_code)
{
    ExitProcess((int)exit_code);
}

// =============================================================================
// Entry points

internal void w32_entry_point(int argc, WCHAR** wargv)
{
    // Dynamically load some windows function that are not guaranteed in all sdk
    {
#define X(x) w32_##x##_func = (void*)GetProcAddress(module, Stringify(x));
        HMODULE module;

        module = LoadLibraryA("kernek32.dll");
        W32_KERNEL32_EXT_X_LIST
        FreeLibrary(module);
#undef X
    }

    SYSTEM_INFO sys_info = { 0 };
    GetSystemInfo(&sys_info);

    {
        w32_state.microsecond_resolution = 1;
        LARGE_INTEGER large_int_resolution;
        if (QueryPerformanceCounter(&large_int_resolution))
        {
            w32_state.microsecond_resolution = large_int_resolution.QuadPart;
        }
    }

    SystemInfo* info      = &w32_state.system_info;
    info->page_size       = sys_info.dwPageSize;
    info->large_page_size = GetLargePageMinimum();

    Arena* args_arena = arena_alloc(.reserve_size = MB(1), .commit_size = KB(32));
    char** argv       = push_array(args_arena, char*, argc);
    for (int i = 0; i < argc; ++i)
    {
        String16 arg16 = str16_cstring((uint16*)wargv[i]);
        String8  arg8  = str8_from_16(args_arena, arg16);
        argv[i]        = (char*)arg8.str;
    }

    // Thread context
    TCTX* tctx = tctx_alloc();
    tctx_select(tctx);

    // setup w32 state
    Arena* arena = arena_alloc();
    {
        w32_state.arena = arena;
        {
            SystemInfo* info                                = &w32_state.system_info;
            DWORD       size                                = MAX_COMPUTERNAME_LENGTH + 1;
            uint8       buffer[MAX_COMPUTERNAME_LENGTH + 1] = { 0 };
            if (GetComputerNameA((char*)buffer, &size))
            {
                info->machine_name = str8_copy(arena, str8(buffer, size));
            }
        }
    }

    // setup entity storage
    InitializeCriticalSection(&w32_state.entity_mutex);
    w32_state.entity_arena = arena_alloc();

    main_thread_core_entry_point(argc, argv);

    tctx_release(tctx);
}

int wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nShowCmd)
{
    (void)hInstance;
    (void)hPrevInstance;
    (void)lpCmdLine;
    (void)nShowCmd;
    w32_entry_point(__argc, __wargv);
    return 0;
}