/*
 * archdep.c - Miscellaneous system-specific stuff.
 *
 * Written by
 *  Tibor Biczo <crown@mail.matav.hu>
 *  Andreas Boose <viceteam@t-online.de>
 *
 * This file is part of VICE, the Versatile Commodore Emulator.
 * See README for copyright notice.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 *  02111-1307  USA.
 *
 */

#include "vice.h"

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <windows.h>
#include <winsock.h>
#include <tlhelp32.h>
#include <tchar.h>

#include "ui.h"

#ifdef HAVE_DIR_H
#include <dir.h>
#endif

#ifdef HAVE_DIRECT_H
#include <direct.h>
#endif

#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif

#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif

#ifdef HAVE_IO_H
#include <io.h>
#endif

#ifdef HAVE_PROCESS_H
#include <process.h>
#endif

#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include "archdep.h"
#include "lib.h"
#include "log.h"
#include "machine.h"
#include "platform.h"
#include "system.h"
#include "util.h"

#define STDIN_FILENO  0
#define STDOUT_FILENO 1
#define STDERR_FILENO 2

#if defined(__WATCOMC__) || defined(WATCOM_COMPILE)
#define _P_WAIT P_WAIT
#define _spawnvp spawnvp
#endif

static char *orig_workdir;
static char *argv0;

int archdep_network_init(void)
{
    WORD wVersionRequested = MAKEWORD(1, 1);
    WSADATA wsaData;

    WSAStartup(wVersionRequested, &wsaData);

    return 0;
}

void archdep_network_shutdown(void)
{
    WSACleanup();
}

int archdep_init(int *argc, char **argv)
{
    _fmode = O_BINARY;

    _setmode(_fileno(stdin), O_BINARY);
    _setmode(_fileno(stdout), O_BINARY);

    argv0 = lib_stralloc(argv[0]);

    orig_workdir = getcwd(NULL, MAX_PATH);

    return 0;
}

static char *program_name = NULL;

char *archdep_program_name(void)
{
    if (program_name == NULL) {
        char *s, *e;
        int len;

        s = strrchr(argv0, '\\');
        if (s == NULL) {
            s = argv0;
        } else {
            s++;
        }
        e = strchr(s, '.');
        if (e == NULL) {
            e = argv0 + strlen(argv0);
        }

        len = (int)(e - s + 1);
        program_name = lib_malloc(len);
        memcpy(program_name, s, len - 1);
        program_name[len - 1] = 0;
    }

    return program_name;
}

static char *boot_path = NULL;

static HANDLE hkernel = NULL;
static HANDLE hpsapi = NULL;

typedef HANDLE (WINAPI *_CreateToolhelp32Snapshot) (
    DWORD dwFlags,
    DWORD th32ProcessID
);

typedef BOOL (WINAPI *_Module32First) (
    HANDLE hSnapshot,
    LPMODULEENTRY32 lpme
);

typedef BOOL (WINAPI *_Module32Next) (
    HANDLE hSnapshot,
    LPMODULEENTRY32 lpme
);

typedef BOOL (WINAPI *_EnumProcessModules) (
    HANDLE hProcess,      // handle to process
    HMODULE *lphModule,   // array of module handles
    DWORD cb,             // size of array
    LPDWORD lpcbNeeded    // number of bytes required
);

typedef DWORD (WINAPI *_GetModuleFileNameEx) (
    HANDLE hProcess,    // handle to process
    HMODULE hModule,    // handle to module
    LPTSTR lpFilename,  // path buffer
    DWORD nSize         // maximum characters to retrieve
);

static BOOL verify_exe(char *file_name)
{
    DWORD version_info_size;
    BOOL bResult = FALSE;
    char *company_name = NULL;
    int company_name_length = 0;

    version_info_size = GetFileVersionInfoSize(file_name, NULL);

    if (version_info_size) {
        BYTE *version_info_buffer = lib_malloc(version_info_size);

        if (GetFileVersionInfo(file_name, 0, version_info_size, (VOID*)version_info_buffer)) {
            if (VerQueryValue(version_info_buffer, "\\StringFileInfo\\04090000\\CompanyName", (void*)&company_name, &company_name_length)) {
                if (company_name) {
                    if (strncmp("Vice Team", company_name, company_name_length) == 0) {
                        bResult = TRUE;
                    }
                }
            }
        }

        lib_free(version_info_buffer);
    }

    return bResult;
}

const char *archdep_boot_path(void)
{
    HANDLE snap;
    MODULEENTRY32 ment;
    HANDLE hproc;
    int cbneed;
    int i;
    _CreateToolhelp32Snapshot func_CreateToolhelp32Snapshot = NULL;
    _Module32First func_Module32First = NULL;
    _Module32Next func_Module32Next = NULL;
    _EnumProcessModules func_EnumProcessModules = NULL;
    _GetModuleFileNameEx func_GetModuleFileNameEx = NULL;
    char *possible_trojan_path;

    possible_trojan_path = NULL;
    if (boot_path == NULL) {
        hkernel = LoadLibrary(TEXT("kernel32.dll"));
        if (hkernel) {
            OutputDebugString(TEXT("DLL: kernel32.dll loaded\n"));

            OutputDebugString(TEXT("DLL: getting address for CreateToolhelp32Snapshot"));
            func_CreateToolhelp32Snapshot = (_CreateToolhelp32Snapshot)GetProcAddress(hkernel, TEXT("CreateToolhelp32Snapshot"));
            if (func_CreateToolhelp32Snapshot) {
                OutputDebugString(TEXT("CreateToolhelp32Snaphshot success\n"));
            }
            else {
                OutputDebugString(TEXT("CreateToolhelp32Snaphshot fail\n"));
            }

            OutputDebugString(TEXT("DLL: getting address for Module32First"));
            func_Module32First = (_Module32First)GetProcAddress(hkernel, TEXT("Module32First"));
            if (func_Module32First) {
                OutputDebugString(TEXT("Module32First success\n"));
            }
            else {
                OutputDebugString(TEXT("Module32First fail\n"));
            }

            OutputDebugString(TEXT("DLL: getting address for Module32Next"));
            func_Module32Next = (_Module32Next)GetProcAddress(hkernel, TEXT("Module32Next"));
            if (func_Module32Next) {
                OutputDebugString(TEXT("Module32Next success\n"));
            }
            else {
                OutputDebugString(TEXT("Module32Next fail\n"));
            }
        }

        hpsapi = LoadLibrary(TEXT("psapi.dll"));
        if (hpsapi) {
            OutputDebugString(TEXT("DLL: psapi.dll loaded"));

            OutputDebugString(TEXT("DLL: getting address for EnumProcessModules"));
            func_EnumProcessModules = (_EnumProcessModules)GetProcAddress(hpsapi, TEXT("EnumProcessModules"));
            if (func_EnumProcessModules) {
                OutputDebugString(TEXT("EnumProcessModules success\n"));
            }
            else {
                OutputDebugString(TEXT("EnumProcessModules fail\n"));
            }

            OutputDebugString(TEXT("DLL: getting address for GetModuleFileNameEx"));
            func_GetModuleFileNameEx = (_GetModuleFileNameEx)GetProcAddress(hpsapi, TEXT("GetModuleFileNameExA"));
            if (func_GetModuleFileNameEx) {
                OutputDebugString(TEXT("GetModuleFileNameEx success\n"));
            }
            else {
                OutputDebugString(TEXT("GetModuleFileNameEx fail\n"));
            }
        }

        if (func_EnumProcessModules) {
            OutputDebugString(TEXT("BOOT path NT method\n"));
            hproc = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_VM_READ, FALSE, GetCurrentProcessId());
            cbneed = 0;
            func_EnumProcessModules(hproc, NULL, 0, (LPDWORD)&cbneed);
            if (cbneed) {
                HMODULE *modules = lib_malloc(cbneed);
                int n_modules = cbneed / sizeof(HMODULE);
                if (func_EnumProcessModules(hproc, modules, cbneed, (LPDWORD)&cbneed)) {
                    for (i = 0; i < n_modules; i++) {
                        TCHAR st_temp[MAX_PATH];
                        char temp[MAX_PATH];
                        if (func_GetModuleFileNameEx(hproc, modules[i], st_temp, MAX_PATH)) {
                            system_wcstombs(temp, st_temp, MAX_PATH);
                            OutputDebugString(st_temp);
                            if (verify_exe(temp)) {
                                util_fname_split(temp, &boot_path, NULL);
                                break;
                            } else if (i == 0) {
                                possible_trojan_path = lib_stralloc(temp);
                            }
                        }
                    }
                }
                lib_free(modules);
            }
            CloseHandle(hproc);
        } else if (func_CreateToolhelp32Snapshot && func_Module32First && func_Module32Next) {
            OutputDebugString(TEXT("BOOT path Win9x method\n"));
            snap = func_CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, GetCurrentProcessId());
            memset(&ment, 0, sizeof(MODULEENTRY32));
            ment.dwSize = sizeof(MODULEENTRY32);
            func_Module32First(snap, &ment);
            OutputDebugString(ment.szExePath);
            if (verify_exe(ment.szExePath)) {
                util_fname_split(ment.szExePath, &boot_path, NULL);
            } else {
                possible_trojan_path = lib_stralloc(ment.szExePath);
                while (func_Module32Next(snap, &ment)) {
                    OutputDebugString(ment.szExePath);
                    if (verify_exe(ment.szExePath)) {
                        util_fname_split(ment.szExePath, &boot_path, NULL);
                        break;
                    }
                }
            }
            CloseHandle(snap);
        } else {
            TCHAR st_temp[MAX_PATH];
            char temp[MAX_PATH];
            OutputDebugString(TEXT("BOOT path NT4 without PSAPI\n"));
            if (GetModuleFileName(NULL, st_temp, MAX_PATH)) {
                system_wcstombs(temp, st_temp, MAX_PATH);
                if (!verify_exe(temp)) {
                    possible_trojan_path = lib_stralloc(temp);
                }
                util_fname_split(temp, &boot_path, NULL);
            } else {
                OutputDebugString(TEXT("Module file name could not be obtained\n"));
            }
        }
        OutputDebugString(TEXT("boot path:"));
        OutputDebugString(boot_path);
        OutputDebugString(TEXT("\n"));

        /* This should not happen, but you never know...  */
        if (boot_path == NULL) {
            boot_path = lib_stralloc(".\\");
        }
    }

    if (possible_trojan_path) {
        archdep_startup_log_error("Vice detected a possible trojan running in its process space\n\n%s\n\nPlease run your favourite Antivirus software!", possible_trojan_path);

        lib_free(possible_trojan_path);
    }

    return boot_path;
}

char *archdep_default_sysfile_pathlist(const char *emu_id)
{
    static char *default_path;

    if (default_path == NULL) {
        const char *boot_path = archdep_boot_path();

        default_path = util_concat(boot_path, "\\", emu_id, ARCHDEP_FINDPATH_SEPARATOR_STRING,
                                   boot_path, "\\DRIVES", ARCHDEP_FINDPATH_SEPARATOR_STRING,
                                   boot_path, "\\PRINTER", NULL);
    }

    return default_path;
}

/* Return a malloc'ed backup file name for file `fname'.  */
char *archdep_make_backup_filename(const char *fname)
{
    char *tmp;

    tmp = util_concat(fname, NULL);
    tmp[strlen(tmp) - 1] = '~';
    return tmp;
}

char *archdep_default_save_resource_file_name(void)
{
    return archdep_default_resource_file_name();
}

char *archdep_default_resource_file_name(void)
{
    return util_concat(archdep_boot_path(), "\\vice.ini", NULL);
}

char *archdep_default_fliplist_file_name(void)
{
    return util_concat(archdep_boot_path(), "\\fliplist-", machine_get_name(), ".vfl", NULL);
}

char *archdep_default_autostart_disk_image_file_name(void)
{
    const char *home;

    home = archdep_boot_path();
    return util_concat(home, "\\autostart-", machine_get_name(), ".d64", NULL);
}

FILE *archdep_open_default_log_file(void)
{
    char *fname;
    FILE *f;

    fname = util_concat(archdep_boot_path(), "\\vice.log", NULL);
    f = fopen(fname, "wt");
    lib_free(fname);

    return f;
}

int archdep_num_text_lines(void)
{
    return 25;
}

int archdep_num_text_columns(void)
{
    return 80;
}

int archdep_default_logger(const char *level_string, const char *txt)
{
    TCHAR *st_out;

    char *out = lib_msprintf("*** %s %s\n", level_string, txt);
    st_out = system_mbstowcs_alloc(out);
    OutputDebugString(st_out);
    system_mbstowcs_free(st_out);
    lib_free(out);
    return 0;
}

int archdep_path_is_relative(const char *path)
{
    if (path == NULL) {
        return 0;
    }

    /* `c:\foo', `c:/foo', `c:foo', `\foo' and `/foo' are absolute.  */

    return !((isalpha(path[0]) && path[1] == ':') || path[0] == '/' || path[0] == '\\');
}

#ifndef _S_IREAD
#define _S_IREAD S_IREAD
#endif

#ifndef _S_IWRITE
#define _S_IWRITE S_IWRITE
#endif

int archdep_spawn(const char *name, char **argv, char **pstdout_redir, const char *stderr_redir)
{
    int new_stdout, new_stderr;
    int old_stdout_mode, old_stderr_mode;
    int old_stdout, old_stderr;
    int retval;
    char *stdout_redir = NULL;

    /* DINK! remove dependancy on unzip.exe being in the system path */
    /* now it will work just as good with unzip.exe in the same dir as x64.exe */
    char *spawn_name = NULL;
    char *unzipfn = NULL;

    spawn_name = (char *)name;
    if (!strcmp(name, "unzip")) {
        unzipfn = util_concat(boot_path, "\\", "unzip.exe", NULL);
        if (util_file_exists(unzipfn)) {
            spawn_name = unzipfn;
        }
    }
    /* !DINK */

    if (pstdout_redir != NULL) {
        if (*pstdout_redir == NULL) {
            *pstdout_redir = archdep_tmpnam();
        }
        stdout_redir = *pstdout_redir;
    }

    new_stdout = new_stderr = old_stdout = old_stderr = -1;

    /* Make sure we are in binary mode.  */
    old_stdout_mode = _setmode(STDOUT_FILENO, _O_BINARY);
    old_stderr_mode = _setmode(STDERR_FILENO, _O_BINARY);

    /* Redirect stdout and stderr as requested, saving the old
       descriptors.  */
    if (stdout_redir != NULL) {
        old_stdout = _dup(STDOUT_FILENO);
        new_stdout = _open(stdout_redir, _O_WRONLY | _O_TRUNC | _O_CREAT, _S_IWRITE | _S_IREAD);
        if (new_stdout == -1) {
            log_error(LOG_DEFAULT, "open(\"%s\") failed: %s.", stdout_redir, strerror(errno));
            retval = -1;
            goto cleanup;
        }
        _dup2(new_stdout, STDOUT_FILENO);
    }
    if (stderr_redir != NULL) {
        old_stderr = _dup(STDERR_FILENO);
        new_stderr = _open(stderr_redir, _O_WRONLY | _O_TRUNC | _O_CREAT, _S_IWRITE | _S_IREAD);
        if (new_stderr == -1) {
            log_error(LOG_DEFAULT, "open(\"%s\") failed: %s.", stderr_redir, strerror(errno));
            retval = -1;
            goto cleanup;
        }
        _dup2(new_stderr, STDERR_FILENO);
    }

    /* Spawn the child process.  */
    retval = (int)_spawnvp(_P_WAIT, spawn_name, (const char * const *)argv);

cleanup:
    if (old_stdout >= 0) {
        _dup2(old_stdout, STDOUT_FILENO);
        _close(old_stdout);
    }
    if (old_stderr >= 0) {
        _dup2(old_stderr, STDERR_FILENO);
        _close(old_stderr);
    }
    if (old_stdout_mode >= 0) {
        _setmode(STDOUT_FILENO, old_stdout_mode);
    }
    if (old_stderr_mode >= 0) {
        _setmode(STDERR_FILENO, old_stderr_mode);
    }
    if (new_stdout >= 0) {
        _close(new_stdout);
    }
    if (new_stderr >= 0) {
        _close(new_stderr);
    }

    return retval;
}

/* return mallocīd version of full pathname of orig_name */
int archdep_expand_path(char **return_path, const char *orig_name)
{
    /*  Win32 version   */
    *return_path = lib_stralloc(orig_name);
    return 0;
}

void archdep_startup_log_error(const char *format, ...)
{
    char *tmp;
    va_list args;

    va_start(args, format);
    tmp = lib_mvsprintf(format, args);
    va_end(args);

    ui_error_string(tmp);
    lib_free(tmp);
}

char *archdep_quote_parameter(const char *name)
{
    char *a,*b,*c;

    a = util_subst(name, "[", "\\[");
    b = util_subst(a, "]", "\\]");
    c = util_concat("\"", b, "\"", NULL);
    lib_free(a);
    lib_free(b);
    return c;
}

char *archdep_filename_parameter(const char *name)
{
    char *exp;
    char *a;

    archdep_expand_path(&exp, name);
    a = util_concat("\"", exp, "\"", NULL);
    lib_free(exp);
    return a;
}

char *archdep_tmpnam(void)
{
    if (getenv("temp")) {
        return util_concat(getenv("temp"), tmpnam(NULL), NULL);
    } else if (getenv("tmp")) {
        return util_concat(getenv("tmp"), tmpnam(NULL), NULL);
    } else {
        return lib_stralloc(tmpnam(NULL));
    }
}

FILE *archdep_mkstemp_fd(char **filename, const char *mode)
{
    char *tmp;
    FILE *fd;

    if (getenv("temp")) {
        tmp = util_concat(getenv("temp"), tmpnam(NULL), NULL);
    } else if (getenv("tmp")) {
        tmp = util_concat(getenv("tmp"), tmpnam(NULL), NULL);
    } else {
        tmp = lib_stralloc(tmpnam(NULL));
    }

    fd = fopen(tmp, mode);

    if (fd == NULL) {
        return NULL;
    }

    *filename = tmp;

    return fd;
}

int archdep_file_is_gzip(const char *name)
{
    size_t l = strlen(name);

    if ((l < 4 || strcasecmp(name + l - 3, ".gz")) && (l < 3 || strcasecmp(name + l - 2, ".z")) && (l < 4 || toupper(name[l - 1]) != 'Z' || name[l - 4] != '.')) {
        return 0;
    }
    return 1;
}

int archdep_file_set_gzip(const char *name)
{
    return 0;
}

int archdep_mkdir(const char *pathname, int mode)
{
    return _mkdir(pathname);
}

int archdep_stat(const char *file_name, unsigned int *len, unsigned int *isdir)
{
    struct stat statbuf;

    if (stat(file_name, &statbuf) < 0) {
        return -1;
    }

    *len = statbuf.st_size;
    *isdir = S_ISDIR(statbuf.st_mode);

    return 0;
}

/* set permissions of given file to rw, respecting current umask */
int archdep_fix_permissions(const char *file_name)
{
    return _chmod(file_name, _S_IREAD | _S_IWRITE);
}

int archdep_file_is_blockdev(const char *name)
{
    return 0;
}

int archdep_file_is_chardev(const char *name)
{
    if (strcmp(name, "/dev/cbm") == 0) {
        return 1;
    }

    return 0;
}

void archdep_shutdown(void)
{
    lib_free(boot_path);
    lib_free(argv0);
    lib_free(orig_workdir);
}

void archdep_workaround_nop(const char *otto)
{
}

int archdep_rtc_get_centisecond(void)
{
    SYSTEMTIME t;

    GetSystemTime(&t);
    return (int)(t.wMilliseconds / 10);
}

char *archdep_get_runtime_os(void)
{
#ifdef WINMIPS
    return "MIPS NT";
#else
    return platform_get_windows_runtime_os();
#endif
}

char *archdep_get_runtime_cpu(void)
{
#if defined(__i386__) || defined(__i486__) || defined(__i586__) || defined(__i686__) || defined(__amd64__) || defined(__x86_64__)
    return platform_get_x86_runtime_cpu();
#else
    /* TODO: add runtime cpu detection code */
    /* arm/mips/alpha/ppc/ia64/sh */
    return "Unknown CPU";
#endif
}
