/* mz_os_win32.c -- System functions for Windows
   Version 2.3.3, June 10, 2018
   part of the MiniZip project

   Copyright (C) 2010-2018 Nathan Moinvaziri
     https://github.com/nmoinvaz/minizip

   This program is distributed under the terms of the same license as zlib.
   See the accompanying LICENSE file for the full text of the license.
*/

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <time.h>
#include <direct.h>
#include <errno.h>

#include <windows.h>
#include <wincrypt.h>

#include "mz.h"

#include "mz_os.h"
#include "mz_os_win32.h"

/***************************************************************************/

#if defined(WINAPI_FAMILY_PARTITION) && (!(defined(MZ_USE_WINRT_API)))
#  if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#    define MZ_USE_WINRT_API 1
#  endif
#endif

/***************************************************************************/

typedef struct DIR_int_s {
    void            *find_handle;
    WIN32_FIND_DATAW find_data;
    struct dirent    entry;
    uint8_t          end;
} DIR_int;

/***************************************************************************/

#if defined(HAVE_PKCRYPT) || defined(HAVE_AES)
int32_t mz_win32_rand(uint8_t *buf, int32_t size)
{
    HCRYPTPROV provider;
    unsigned __int64 pentium_tsc[1];
    int32_t len = 0;
    int32_t result = 0;


    if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT))
    {
        result = CryptGenRandom(provider, size, buf);
        CryptReleaseContext(provider, 0);
        if (result)
            return size;
    }

    for (len = 0; len < (int)size; len += 1)
    {
        if (len % 8 == 0)
            QueryPerformanceCounter((LARGE_INTEGER *)pentium_tsc);
        buf[len] = ((unsigned char*)pentium_tsc)[len % 8];
    }

    return len;
}
#endif

wchar_t *mz_win32_unicode_path_create(const char *path)
{
    wchar_t *path_wide = NULL;
    uint32_t path_wide_size = 0;

    path_wide_size = MultiByteToWideChar(CP_UTF8, 0, path, -1, NULL, 0);
    path_wide = (wchar_t *)MZ_ALLOC((path_wide_size + 1) * sizeof(wchar_t));
    memset(path_wide, 0, sizeof(wchar_t) * (path_wide_size + 1));

    MultiByteToWideChar(CP_UTF8, 0, path, -1, path_wide, path_wide_size);

    return path_wide;
}

void mz_win32_unicode_path_delete(wchar_t **path)
{
    if (path != NULL)
    {
        MZ_FREE(*path);
        *path = NULL;
    }
}

int32_t mz_win32_file_exists(const char *path)
{
    wchar_t *path_wide = NULL;
    DWORD attribs = 0;


    path_wide = mz_win32_unicode_path_create(path);
    attribs = GetFileAttributesW(path_wide);
    mz_win32_unicode_path_delete(&path_wide);

    if (attribs == 0xFFFFFFFF)
        return MZ_EXIST_ERROR;

    return MZ_OK;
}

int64_t mz_win32_get_file_size(const char *path)
{
    HANDLE handle = NULL;
    LARGE_INTEGER large_size;
    wchar_t *path_wide = NULL;


    path_wide = mz_win32_unicode_path_create(path);
#ifdef MZ_USE_WINRT_API
    handle = CreateFile2W(path_wide, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
#else
    handle = CreateFileW(path_wide, GENERIC_READ, 0, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
#endif
    mz_win32_unicode_path_delete(&path_wide);

    large_size.QuadPart = 0;

    if (handle != INVALID_HANDLE_VALUE)
    {
        GetFileSizeEx(handle, &large_size);
        CloseHandle(handle);
    }

    return large_size.QuadPart;
}

static void mz_win32_file_to_unix_time(FILETIME file_time, time_t *unix_time)
{
    uint64_t quad_file_time = 0;
    quad_file_time = file_time.dwLowDateTime;
    quad_file_time |= ((uint64_t)file_time.dwHighDateTime << 32);
    *unix_time = (time_t)((quad_file_time - 116444736000000000LL) / 10000000);
}

static void mz_win32_unix_to_file_time(time_t unix_time, FILETIME *file_time)
{
    uint64_t quad_file_time = 0;
    quad_file_time = ((uint64_t)unix_time * 10000000) + 116444736000000000LL;
    file_time->dwHighDateTime = (quad_file_time >> 32);
    file_time->dwLowDateTime = (uint32_t)(quad_file_time);
}

int32_t mz_win32_get_file_date(const char *path, time_t *modified_date, time_t *accessed_date, time_t *creation_date)
{
    WIN32_FIND_DATAW ff32;
    HANDLE handle = NULL;
    wchar_t *path_wide = NULL;
    int32_t err = MZ_INTERNAL_ERROR;

    path_wide = mz_win32_unicode_path_create(path);
    handle = FindFirstFileW(path_wide, &ff32);
    MZ_FREE(path_wide);

    if (handle != INVALID_HANDLE_VALUE)
    {
        if (modified_date != NULL)
            mz_win32_file_to_unix_time(ff32.ftLastWriteTime, modified_date);
        if (accessed_date != NULL)
            mz_win32_file_to_unix_time(ff32.ftLastAccessTime, accessed_date);
        if (creation_date != NULL)
            mz_win32_file_to_unix_time(ff32.ftCreationTime, creation_date);

        FindClose(handle);
        err = MZ_OK;
    }

    return err;
}

int32_t mz_win32_set_file_date(const char *path, time_t modified_date, time_t accessed_date, time_t creation_date)
{
    HANDLE handle = NULL;
    FILETIME ftm_creation, ftm_accessed, ftm_modified;
    wchar_t *path_wide = NULL;
    int32_t err = MZ_OK;


    path_wide = mz_win32_unicode_path_create(path);
#ifdef MZ_USE_WINRT_API
    handle = CreateFile2W(path_wide, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
#else
    handle = CreateFileW(path_wide, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
#endif
    mz_win32_unicode_path_delete(&path_wide);

    if (handle != INVALID_HANDLE_VALUE)
    {
        GetFileTime(handle, &ftm_creation, &ftm_accessed, &ftm_modified);

        if (modified_date != 0)
            mz_win32_unix_to_file_time(modified_date, &ftm_modified);
        if (accessed_date != 0)
            mz_win32_unix_to_file_time(accessed_date, &ftm_accessed);
        if (creation_date != 0)
            mz_win32_unix_to_file_time(creation_date, &ftm_creation);

        if (SetFileTime(handle, &ftm_creation, &ftm_accessed, &ftm_modified) == 0)
            err = MZ_INTERNAL_ERROR;

        CloseHandle(handle);
    }

    return err;
}

int32_t mz_win32_get_file_attribs(const char *path, uint32_t *attributes)
{
    wchar_t *path_wide = NULL;
    int32_t err = MZ_OK;

    path_wide = mz_win32_unicode_path_create(path);
    *attributes = GetFileAttributesW(path_wide);
    MZ_FREE(path_wide);

    if (*attributes == INVALID_FILE_ATTRIBUTES)
        err = MZ_INTERNAL_ERROR;

    return err;
}

int32_t mz_win32_set_file_attribs(const char *path, uint32_t attributes)
{
    wchar_t *path_wide = NULL;
    int32_t err = MZ_OK;

    path_wide = mz_win32_unicode_path_create(path);
    if (SetFileAttributesW(path_wide, attributes) == 0)
        err = MZ_INTERNAL_ERROR;
    MZ_FREE(path_wide);

    return err;
}

int32_t mz_win32_make_dir(const char *path)
{
    wchar_t *path_wide = NULL;
    int32_t err = 0;


    path_wide = mz_win32_unicode_path_create(path);
    err = _wmkdir(path_wide);
    mz_win32_unicode_path_delete(&path_wide);

    if (err != 0 && errno != EEXIST)
        return MZ_INTERNAL_ERROR;

    return MZ_OK;
}

DIR *mz_win32_open_dir(const char *path)
{
    WIN32_FIND_DATAW find_data;
    DIR_int *dir_int = NULL;
    wchar_t *path_wide = NULL;
    char fixed_path[320];
    void *handle = NULL;


    fixed_path[0] = 0;
    mz_path_combine(fixed_path, path, sizeof(fixed_path));
    mz_path_combine(fixed_path, "*", sizeof(fixed_path));

    path_wide = mz_win32_unicode_path_create(fixed_path);
    handle = FindFirstFileW(path_wide, &find_data);
    mz_win32_unicode_path_delete(&path_wide);

    if (handle == INVALID_HANDLE_VALUE)
        return NULL;

    dir_int = (DIR_int *)MZ_ALLOC(sizeof(DIR_int));
    dir_int->find_handle = handle;
    dir_int->end = 0;

    memcpy(&dir_int->find_data, &find_data, sizeof(dir_int->find_data));

    return (DIR *)dir_int;
}

struct dirent* mz_win32_read_dir(DIR *dir)
{
    DIR_int *dir_int;

    if (dir == NULL)
        return NULL;

    dir_int = (DIR_int *)dir;
    if (dir_int->end)
        return NULL;

    WideCharToMultiByte(CP_UTF8, 0, dir_int->find_data.cFileName, -1,
        dir_int->entry.d_name, sizeof(dir_int->entry.d_name), NULL, NULL);

    if (FindNextFileW(dir_int->find_handle, &dir_int->find_data) == 0)
    {
        if (GetLastError() != ERROR_NO_MORE_FILES)
            return NULL;

        dir_int->end = 1;
    }

    return &dir_int->entry;
}

int32_t mz_win32_close_dir(DIR *dir)
{
    DIR_int *dir_int;

    if (dir == NULL)
        return MZ_PARAM_ERROR;

    dir_int = (DIR_int *)dir;
    if (dir_int->find_handle != INVALID_HANDLE_VALUE)
        FindClose(dir_int->find_handle);
    MZ_FREE(dir_int);
    return MZ_OK;
}

int32_t mz_win32_is_dir(const char *path)
{
    wchar_t *path_wide = NULL;
    uint32_t attribs = 0;

    path_wide = mz_win32_unicode_path_create(path);
    attribs = GetFileAttributesW(path_wide);
    mz_win32_unicode_path_delete(&path_wide);

    if (attribs != 0xFFFFFFFF)
    {
        if (attribs & FILE_ATTRIBUTE_DIRECTORY)
            return MZ_OK;
    }

    return MZ_EXIST_ERROR;
}