#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include <stdint.h>
#include <assert.h>

#include "windef.h"
#include "winbase.h"
#include "winnls.h"
#include "winuser.h"
#include "winternl.h"

#include "steamclient_private.h"

WINE_DEFAULT_DEBUG_CHANNEL(steamclient);

CREATE_TYPE_INFO_VTABLE;

#ifdef __ASM_USE_THISCALL_WRAPPER

#define DEFINE_VTBL_WRAPPER(off)            \
    __ASM_GLOBAL_FUNC(vtbl_wrapper_ ## off, \
        "popl %eax\n\t"                     \
        "popl %ecx\n\t"                     \
        "pushl %eax\n\t"                    \
        "movl 0(%ecx), %eax\n\t"            \
        "jmp *" #off "(%eax)\n\t")

DEFINE_VTBL_WRAPPER(0);
DEFINE_VTBL_WRAPPER(4);
DEFINE_VTBL_WRAPPER(8);
DEFINE_VTBL_WRAPPER(12);
DEFINE_VTBL_WRAPPER(16);
DEFINE_VTBL_WRAPPER(20);
DEFINE_VTBL_WRAPPER(24);
DEFINE_VTBL_WRAPPER(28);
DEFINE_VTBL_WRAPPER(32);
DEFINE_VTBL_WRAPPER(36);
DEFINE_VTBL_WRAPPER(40);
DEFINE_VTBL_WRAPPER(44);
DEFINE_VTBL_WRAPPER(48);
DEFINE_VTBL_WRAPPER(52);
DEFINE_VTBL_WRAPPER(56);

#endif

char g_tmppath[PATH_MAX];

static CRITICAL_SECTION steamclient_cs = { NULL, -1, 0, 0, 0, 0 };
static HANDLE steam_overlay_event;

BOOL WINAPI DllMain(HINSTANCE instance, DWORD reason, void *reserved)
{
    TRACE("(%p, %u, %p)\n", instance, reason, reserved);

    switch (reason)
    {
        case DLL_PROCESS_ATTACH:
            DisableThreadLibraryCalls(instance);
            steam_overlay_event = CreateEventA(NULL, TRUE, FALSE, "__wine_steamclient_GameOverlayActivated");
#ifdef __x86_64__
            init_type_info_rtti( (char *)instance );
            init_rtti( (char *)instance );
#endif /* __x86_64__ */
            break;
        case DLL_PROCESS_DETACH:
            CloseHandle(steam_overlay_event);
            break;
    }

    return TRUE;
}

static BYTE *alloc_start, *alloc_end;

static int8_t allocated_from_steamclient_dll( void *ptr )
{
    return (BYTE *)ptr >= alloc_start && (BYTE *)ptr < alloc_end;
}

static void *get_mem_from_steamclient_dll(size_t size, unsigned int version, void *vtbl)
{
    static BYTE * const error_ptr = (BYTE *)~(ULONG_PTR)0;
    static const unsigned int magic = 0x53ba947a;
    static struct
    {
        unsigned int version;
        void *vtbl;
        size_t size;
        void *ptr;
    }
    allocated[256];
    static unsigned int allocated_count;
    static BYTE *alloc_base;
    unsigned int i;

    if (alloc_base == error_ptr)
    {
        /* Previously failed to locate the section. */
        return NULL;
    }

    if (alloc_base && (IsBadReadPtr(alloc_start, sizeof(magic)) || *(unsigned int *)alloc_start != magic))
    {
        TRACE("steamclient.dll reloaded.\n");
        alloc_base = alloc_start = alloc_end = NULL;
        allocated_count = 0;
    }

    for (i = 0; i < allocated_count; ++i)
    {
        if ((vtbl && allocated[i].vtbl == vtbl) || (!vtbl && allocated[i].version == version))
        {
            if (allocated[i].size != size)
            {
                FIXME("Size does not match.\n");
                return NULL;
            }
            return allocated[i].ptr;
        }
    }

    if (allocated_count == ARRAY_SIZE(allocated))
    {
        FIXME("Too many interface versions.\n");
        return NULL;
    }

    if (!alloc_base)
    {
        static const WCHAR steamclientW[] = {'s','t','e','a','m','c','l','i','e','n','t','.','d','l','l',0};
        const IMAGE_SECTION_HEADER *sec;
        const IMAGE_NT_HEADERS *nt;
        HMODULE mod;

        if (!(mod = GetModuleHandleW(steamclientW)))
        {
            /* That is steamclient64.dll for x64 but no known use cases on x64.*/
            WARN("Module not found, err %u.\n", GetLastError());
            alloc_base = error_ptr;
            return NULL;
        }
        if (!(nt = RtlImageNtHeader(mod)))
        {
            FIXME("Got NULL NT image headers.\n");
            alloc_base = error_ptr;
            return NULL;
        }
        sec = (const IMAGE_SECTION_HEADER *)((const BYTE *)&nt->OptionalHeader + nt->FileHeader.SizeOfOptionalHeader);
        for (i = 0; i < nt->FileHeader.NumberOfSections; i++)
        {
            if (!memcmp(sec[i].Name, ".data", 5))
            {
                alloc_start = alloc_base = (BYTE *)mod + sec[i].VirtualAddress;
                alloc_end = alloc_base + sec[i].SizeOfRawData;
                if (alloc_end - alloc_start < sizeof(magic))
                {
                    ERR(".data section is too small.\n");
                    alloc_base = error_ptr;
                    return NULL;
                }
                TRACE("Found .data section, start %p, end %p.\n", alloc_base, alloc_end);
                *(unsigned int *)alloc_base = magic;
                alloc_base += sizeof(unsigned int);
                break;
            }
        }
        if (i == nt->FileHeader.NumberOfSections)
        {
            FIXME(".data section not found.\n");
            alloc_base = error_ptr;
            return NULL;
        }
    }

    if (alloc_end - alloc_base < size)
    {
        FIXME("Not enough section size left.\n");
        return NULL;
    }
    allocated[allocated_count].version = version;
    allocated[allocated_count].vtbl = vtbl;
    allocated[allocated_count].size = size;
    allocated[allocated_count].ptr = alloc_base;
    alloc_base += size;

    return allocated[allocated_count++].ptr;
}

void *alloc_mem_for_iface(size_t size, const char *iface_version)
{
    const char steamclient_iface_name[] = "SteamClient";
    unsigned int version;
    void *ret;

    /* Mafia II depends on SteamClient interface pointer to point inside
     * native Windows steamclient.dll. */
    if (strncmp(iface_version, steamclient_iface_name, ARRAY_SIZE(steamclient_iface_name) - 1))
         goto fallback;

    version = atoi(iface_version + ARRAY_SIZE(steamclient_iface_name) - 1);
    if (!version)
    {
        FIXME("Could not get iface version from %s.\n", iface_version);
        goto fallback;
    }

    if ((ret = get_mem_from_steamclient_dll(size, version, NULL)))
        return ret;

fallback:
    return HeapAlloc(GetProcessHeap(), 0, size);
}

void *alloc_vtable(void *vtable, unsigned int method_count, const char *iface_version)
{
    static const char *iface_names[] =
    {
        "SteamUser",
        "SteamFriends",
        "SteamUtils",
        "STEAMUSERSTATS",
        "STEAMAPPS",
        "SteamNetworking",
        "SteamClient",
    };
    unsigned int i;
    char *ret;

    for (i = 0; i < ARRAY_SIZE(iface_names); ++i)
        if (!strncmp(iface_version, iface_names[i], strlen(iface_names[i]) - 1))
            break;

    if (i == ARRAY_SIZE(iface_names))
        return vtable;

    if (!(ret = get_mem_from_steamclient_dll(method_count * sizeof(void *), 0, vtable)))
        return vtable;

    TRACE("iface %s, method_count %d, allocating from module.\n", iface_version, method_count);

    memcpy(ret, vtable, method_count * sizeof(void *));
    return ret;
}

struct steamclient_interface
{
    struct list entry;
    const char *name;
    void *u_iface;
    struct w_steam_iface *w_iface;
};

static struct list steamclient_interfaces = LIST_INIT(steamclient_interfaces);

struct w_steam_iface *create_win_interface(const char *name, void *u_iface)
{
    struct steamclient_interface *e;
    struct w_steam_iface *ret = NULL;
    iface_constructor constructor;

    TRACE("trying to create %s\n", name);

    if (!u_iface)
        return NULL;

    EnterCriticalSection(&steamclient_cs);

    LIST_FOR_EACH_ENTRY(e, &steamclient_interfaces, struct steamclient_interface, entry)
    {
        if (e->u_iface == u_iface && !strcmp(e->name, name))
        {
            ret = e->w_iface;
            TRACE("-> %p\n", ret);
            goto done;
        }
    }

    if ((constructor = find_iface_constructor( name )))
    {
        ret = constructor( u_iface );
        if (allocated_from_steamclient_dll( ret ) || allocated_from_steamclient_dll( ret->vtable ))
        {
            /* Don't cache interfaces allocated from steamclient.dll space.
             * steamclient may get reloaded by the app, miss the previous
             * data and potentially have different load address. */
            goto done;
        }

        e = HeapAlloc( GetProcessHeap(), 0, sizeof(*e) );
        e->name = strdup( name );
        e->u_iface = u_iface;
        e->w_iface = ret;
        list_add_tail( &steamclient_interfaces, &e->entry );

        goto done;
    }

done:
    LeaveCriticalSection(&steamclient_cs);
    if (!ret) ERR("Don't recognize interface name: %s\n", name);
    return ret;
}

static int load_steamclient(void)
{
    char steam_app_id[4096], ignore_child_processes[4096];
    struct steamclient_init_params params = {0};

    if (!GetEnvironmentVariableA("SteamAppId", steam_app_id, ARRAY_SIZE(steam_app_id)))
        params.steam_app_id_unset = GetLastError() == ERROR_ENVVAR_NOT_FOUND;
    else
        params.steam_app_id = steam_app_id;

    if (!GetEnvironmentVariableA("IgnoreChildProcesses", ignore_child_processes, ARRAY_SIZE(ignore_child_processes)))
        params.ignore_child_processes_unset = GetLastError() == ERROR_ENVVAR_NOT_FOUND;
    else
        params.ignore_child_processes = ignore_child_processes;

    if (STEAMCLIENT_CALL( steamclient_init, &params )) return 0;
    return 1;
}

void *CDECL CreateInterface(const char *name, int *return_code)
{
    struct steamclient_CreateInterface_params params = {.name = name, .return_code = return_code};

    TRACE("name: %s, return_code: %p\n", name, return_code);
    if (!load_steamclient()) return NULL;
    if (STEAMCLIENT_CALL( steamclient_CreateInterface, &params )) return NULL;
    return create_win_interface( name, params._ret );
}

static void execute_pending_callbacks(void)
{
    struct steamclient_next_callback_params params = {0};

    while (!STEAMCLIENT_CALL( steamclient_next_callback, &params ) && params._ret)
    {
        if (!params.callback || params.size > params.callback->size)
            params.callback = realloc( params.callback, params.size );
        else switch (params.callback->type)
        {
        case SOCKETS_DEBUG_OUTPUT:
            TRACE( "SOCKETS_DEBUG_OUTPUT func %p, type %u, msg %s.\n", params.callback->sockets_debug_output.pfnFunc,
                   params.callback->sockets_debug_output.type, wine_dbgstr_a( params.callback->sockets_debug_output.msg ) );
            params.callback->sockets_debug_output.pfnFunc( params.callback->sockets_debug_output.type, params.callback->sockets_debug_output.msg );
            break;
        case WARNING_MESSAGE_HOOK:
            TRACE( "WARNING_MESSAGE_HOOK func %p, severity %d, msg %s.\n", params.callback->warning_message_hook.pFunction,
                   params.callback->warning_message_hook.severity, wine_dbgstr_a( params.callback->warning_message_hook.msg ) );
            params.callback->warning_message_hook.pFunction( params.callback->warning_message_hook.severity, params.callback->warning_message_hook.msg );
            break;
        case CALL_CDECL_FUNC_DATA:
            TRACE( "CALL_CDECL_FUNC_DATA func %p, data %p.\n", params.callback->call_cdecl_func_data.pFunc, params.callback->call_cdecl_func_data.data );
            params.callback->call_cdecl_func_data.pFunc( params.callback->call_cdecl_func_data.data );
            break;
        case CALL_IFACE_VTABLE_0:
            TRACE( "CALL_IFACE_VTABLE_0 iface %p, arg0 %#jx, arg1 %#jx, arg2 %#jx.\n", params.callback->call_iface_vtable.iface,
                   params.callback->call_iface_vtable.arg0, params.callback->call_iface_vtable.arg1, params.callback->call_iface_vtable.arg2 );
            CALL_VTBL_FUNC( params.callback->call_iface_vtable.iface, 0, void, (void *, intptr_t, intptr_t, intptr_t), (params.callback->call_iface_vtable.iface,
                            params.callback->call_iface_vtable.arg0, params.callback->call_iface_vtable.arg1, params.callback->call_iface_vtable.arg2) );
            break;
        case CALL_IFACE_VTABLE_1:
            TRACE( "CALL_IFACE_VTABLE_1 iface %p, arg0 %#jx, arg1 %#jx, arg2 %#jx.\n", params.callback->call_iface_vtable.iface,
                   params.callback->call_iface_vtable.arg0, params.callback->call_iface_vtable.arg1, params.callback->call_iface_vtable.arg2 );
            CALL_VTBL_FUNC( params.callback->call_iface_vtable.iface, 4, void, (void *, intptr_t, intptr_t, intptr_t), (params.callback->call_iface_vtable.iface,
                            params.callback->call_iface_vtable.arg0, params.callback->call_iface_vtable.arg1, params.callback->call_iface_vtable.arg2) );
            break;
        case CALL_IFACE_VTABLE_2:
            TRACE( "CALL_IFACE_VTABLE_2 iface %p, arg0 %#jx, arg1 %#jx, arg2 %#jx.\n", params.callback->call_iface_vtable.iface,
                   params.callback->call_iface_vtable.arg0, params.callback->call_iface_vtable.arg1, params.callback->call_iface_vtable.arg2 );
            CALL_VTBL_FUNC( params.callback->call_iface_vtable.iface, 8, void, (void *, intptr_t, intptr_t, intptr_t), (params.callback->call_iface_vtable.iface,
                            params.callback->call_iface_vtable.arg0, params.callback->call_iface_vtable.arg1, params.callback->call_iface_vtable.arg2) );
            break;

        case CALL_IFACE_VTABLE_0_ADD_PLAYER_TO_LIST:
            TRACE( "CALL_IFACE_VTABLE_0_ADD_PLAYER_TO_LIST iface %p, name %s, score %u, time_played %f.\n", params.callback->add_player_to_list.iface,
                   params.callback->add_player_to_list.name, params.callback->add_player_to_list.score, params.callback->add_player_to_list.time_played );
            CALL_VTBL_FUNC( params.callback->add_player_to_list.iface, 0, void, (void *, const char *, int32_t, float), (params.callback->add_player_to_list.iface,
                            params.callback->add_player_to_list.name, params.callback->add_player_to_list.score, params.callback->add_player_to_list.time_played) );
            break;
        case CALL_IFACE_VTABLE_0_RULES_RESPONDED:
        {
            const char *value = params.callback->rules_responded.rule_and_value + strlen( params.callback->rules_responded.rule_and_value ) + 1;
            TRACE( "CALL_IFACE_VTABLE_0_RULES_RESPONDED iface %p, rule %s, value %s.\n", params.callback->rules_responded.iface,
                   params.callback->rules_responded.rule_and_value, value );
            CALL_VTBL_FUNC( params.callback->rules_responded.iface, 0, void, (void *, const char *, const char *), (params.callback->rules_responded.iface,
                            params.callback->rules_responded.rule_and_value, value) );
            break;
        }
        }
    }

    free( params.callback );
}

static void *last_callback_data;

int8_t CDECL Steam_FreeLastCallback( int32_t pipe )
{
    struct steamclient_Steam_FreeLastCallback_params params = {.pipe = pipe};
    TRACE( "%u\n", pipe );

    if (!load_steamclient()) return 0;

    HeapFree( GetProcessHeap(), 0, last_callback_data );
    last_callback_data = NULL;

    STEAMCLIENT_CALL( steamclient_Steam_FreeLastCallback, &params );
    return params._ret;
}

int8_t CDECL Steam_BGetCallback( int32_t pipe, w_CallbackMsg_t *win_msg, int32_t *ignored )
{
    u_CallbackMsg_t u_msg;
    struct steamclient_Steam_BGetCallback_params params =
    {
        .pipe = pipe,
        .w_msg = win_msg,
        .ignored = ignored,
        .u_msg = &u_msg,
    };
    struct steamclient_callback_message_receive_params receive_params =
    {
        .u_msg = &u_msg,
        .w_msg = win_msg,
    };

    TRACE("%u, %p, %p\n", pipe, win_msg, ignored);

    if (!load_steamclient()) return 0;

    execute_pending_callbacks();

next_event:
    STEAMCLIENT_CALL( steamclient_Steam_BGetCallback, &params );
    if (!params._ret) return FALSE;

    if (!(win_msg->m_pubParam = HeapAlloc( GetProcessHeap(), 0, win_msg->m_cubParam ))) return FALSE;
    last_callback_data = win_msg->m_pubParam;
    STEAMCLIENT_CALL( steamclient_callback_message_receive, &receive_params );

    if (win_msg->m_iCallback == 0x14b) /* GameOverlayActivated_t::k_iCallback */
    {
        uint8_t activated = *(uint8_t *)win_msg->m_pubParam;
        FIXME( "HACK: Steam overlay %sactivated, %sabling all input events.\n",
               activated ? "" : "de", activated ? "dis" : "en" );
        if (activated)
        {
            SetEvent( steam_overlay_event );
            keybd_event( VK_LSHIFT, 0x2a /* lshift scancode */, KEYEVENTF_KEYUP, 0 );
            keybd_event( VK_RSHIFT, 0x36 /* rshift scancode */, KEYEVENTF_KEYUP, 0 );
            keybd_event( VK_TAB, 0x0f /* tab scancode */, KEYEVENTF_KEYUP, 0 );
        }
        else
        {
            if (WaitForSingleObject( steam_overlay_event, 0 ) == WAIT_TIMEOUT)
            {
                FIXME( "Spurious steam overlay deactivate event, skipping.\n" );
                Steam_FreeLastCallback( pipe );
                goto next_event;
            }
            ResetEvent( steam_overlay_event );
        }
    }

    execute_pending_callbacks();
    return params._ret;
}

int8_t CDECL Steam_GetAPICallResult( int32_t pipe, uint64_t call, void *w_callback,
                                   int w_callback_len, int id, int8_t *failed )
{
    struct steamclient_Steam_GetAPICallResult_params params =
    {
        .pipe = pipe,
        .call = call,
        .w_callback = w_callback,
        .w_callback_len = w_callback_len,
        .id = id,
        .failed = failed,
    };

    TRACE( "%u, x, %p, %u, %u, %p\n", pipe, w_callback, w_callback_len, id, failed );

    if (!load_steamclient()) return FALSE;
    STEAMCLIENT_CALL( steamclient_Steam_GetAPICallResult, &params );
    return params._ret;
}

void CDECL Steam_ReleaseThreadLocalMemory(int bThreadExit)
{
    struct steamclient_Steam_ReleaseThreadLocalMemory_params params = {.thread_exit = bThreadExit};
    TRACE("%d\n", bThreadExit);

    if (!load_steamclient()) return;

    STEAMCLIENT_CALL( steamclient_Steam_ReleaseThreadLocalMemory, &params );
}

void CDECL Breakpad_SteamMiniDumpInit( uint32_t a, const char *b, const char *c )
{
    TRACE("\n");
}

void CDECL Breakpad_SteamSetAppID( uint32_t appid )
{
    TRACE("\n");
}

int CDECL Breakpad_SteamSetSteamID( uint64_t steamid )
{
    TRACE("\n");
    return 1;
}

int CDECL Breakpad_SteamWriteMiniDumpSetComment(const char *comment)
{
    TRACE("\n");
    return 1;
}

void CDECL Breakpad_SteamWriteMiniDumpUsingExceptionInfoWithBuildId(int a, int b)
{
    TRACE("\n");
}

int8_t CDECL Steam_IsKnownInterface( const char *pchVersion )
{
    struct steamclient_Steam_IsKnownInterface_params params = {.version = pchVersion};
    TRACE("%s\n", pchVersion);
    load_steamclient();
    STEAMCLIENT_CALL( steamclient_Steam_IsKnownInterface, &params );
    return params._ret;
}

void CDECL Steam_NotifyMissingInterface( int32_t hSteamPipe, const char *pchVersion )
{
    struct steamclient_Steam_NotifyMissingInterface_params params = {.pipe = hSteamPipe, .version = pchVersion};
    TRACE("%u %s\n", hSteamPipe, pchVersion);
    load_steamclient();
    STEAMCLIENT_CALL( steamclient_Steam_NotifyMissingInterface, &params );
}