/*

---------------------------------------------------------------------------

Open Asset Import Library (assimp)

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Copyright (c) 2006-2026, assimp team

All rights reserved.

Redistribution and use of this software in source and binary forms,

with or without modification, are permitted provided that the following

conditions are met:

* Redistributions of source code must retain the above

  copyright notice, this list of conditions and the

  following disclaimer.

* Redistributions in binary form must reproduce the above

  copyright notice, this list of conditions and the

  following disclaimer in the documentation and/or other

  materials provided with the distribution.

* Neither the name of the assimp team, nor the names of its

  contributors may be used to endorse or promote products

  derived from this software without specific prior

  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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*/

/** @file Default implementation of IOSystem using the standard C file functions */

#include <assimp/StringComparison.h>

#include <assimp/DefaultIOStream.h>

#include <assimp/DefaultIOSystem.h>

#include <assimp/ai_assert.h>

#include <stdlib.h>

#include <assimp/DefaultLogger.hpp>

#ifdef __unix__

#    include <stdlib.h>

#    include <sys/param.h>

#endif

#ifdef _WIN32

#    include <windows.h>

#endif

using namespace Assimp;

#ifdef _WIN32

const std::wstring wdummy;

static std::wstring Utf8ToWide(const char *in) {

    if (nullptr == in) {

        return wdummy;

    }

    int size = MultiByteToWideChar(CP_UTF8, 0, in, -1, nullptr, 0);

    // size includes terminating null; std::wstring adds null automatically

    std::wstring out(static_cast<size_t>(size) - 1, L'\0');

    MultiByteToWideChar(CP_UTF8, 0, in, -1, &out[0], size);

    return out;

}

const std::string dummy;

static std::string WideToUtf8(const wchar_t *in) {

    if (nullptr == in) {

        return dummy;

    }

    int size = WideCharToMultiByte(CP_UTF8, 0, in, -1, nullptr, 0, nullptr, nullptr);

    // size includes terminating null; std::string adds null automatically

    std::string out(static_cast<size_t>(size) - 1, '\0');

    WideCharToMultiByte(CP_UTF8, 0, in, -1, &out[0], size, nullptr, nullptr);

    return out;

}

#endif

// ------------------------------------------------------------------------------------------------

// Tests for the existence of a file at the given path.

bool DefaultIOSystem::Exists(const char *pFile) const {

    if (pFile == nullptr) {

        return false;

    }

#ifdef _WIN32

    struct __stat64 filestat;

    if (_wstat64(Utf8ToWide(pFile).c_str(), &filestat) != 0) {

        return false;

    }

#else

  struct stat statbuf;

    if (stat(pFile, &statbuf) != 0) {

        return false;

    }

    // test for a regular file

    if (!S_ISREG(statbuf.st_mode)) {

        return false;

    }

#endif

    return true;

}

// ------------------------------------------------------------------------------------------------

// Open a new file with a given path.

IOStream *DefaultIOSystem::Open(const char *strFile, const char *strMode) {

    ai_assert(strFile != nullptr);

    ai_assert(strMode != nullptr);

    FILE *file;

#ifdef _WIN32

    std::wstring name = Utf8ToWide(strFile);

    if (name.empty()) {

        return nullptr;

    }

    file = ::_wfopen(name.c_str(), Utf8ToWide(strMode).c_str());

#else

    file = ::fopen(strFile, strMode);

#endif

    if (!file) {

        return nullptr;

    }

    return new DefaultIOStream(file, strFile);

}

// ------------------------------------------------------------------------------------------------

// Closes the given file and releases all resources associated with it.

void DefaultIOSystem::Close(IOStream *pFile) {

    delete pFile;

}

// ------------------------------------------------------------------------------------------------

// Returns the operation specific directory separator

char DefaultIOSystem::getOsSeparator() const {

#ifndef _WIN32

    return '/';

#else

    return '\\';

#endif

}

// ------------------------------------------------------------------------------------------------

// IOSystem default implementation (ComparePaths isn't a pure virtual function)

bool IOSystem::ComparePaths(const char *one, const char *second) const {

    return !ASSIMP_stricmp(one, second);

}

// ------------------------------------------------------------------------------------------------

// Convert a relative path into an absolute path

inline static std::string MakeAbsolutePath(const char *in) {

    ai_assert(in);

    std::string out;

#ifdef _WIN32

    wchar_t *ret = ::_wfullpath(nullptr, Utf8ToWide(in).c_str(), 0);

    if (ret) {

        out = WideToUtf8(ret);

        free(ret);

    }

#else

    char *ret = realpath(in, nullptr);

    if (ret) {

        out = ret;

        free(ret);

    }

#endif

    else {

        // preserve the input path, maybe someone else is able to fix

        // the path before it is accessed (e.g. our file system filter)

        ASSIMP_LOG_WARN("Invalid path: ", std::string(in));

        out = in;

    }

    return out;

}

// ------------------------------------------------------------------------------------------------

// DefaultIOSystem's more specialized implementation

bool DefaultIOSystem::ComparePaths(const char *one, const char *second) const {

    // chances are quite good both paths are formatted identically,

    // so we can hopefully return here already

    if (!ASSIMP_stricmp(one, second))

        return true;

    std::string temp1 = MakeAbsolutePath(one);

    std::string temp2 = MakeAbsolutePath(second);

    return !ASSIMP_stricmp(temp1, temp2);

}

// ------------------------------------------------------------------------------------------------

std::string DefaultIOSystem::fileName(const std::string &path) {

    std::string ret = path;

    std::size_t last = ret.find_last_of("\\/");

    if (last != std::string::npos) ret = ret.substr(last + 1);

    return ret;

}

// ------------------------------------------------------------------------------------------------

std::string DefaultIOSystem::completeBaseName(const std::string &path) {

    std::string ret = fileName(path);

    std::size_t pos = ret.find_last_of('.');

    if (pos != std::string::npos) ret = ret.substr(0, pos);

    return ret;

}

// ------------------------------------------------------------------------------------------------

std::string DefaultIOSystem::absolutePath(const std::string &path) {

    std::string ret = path;

    std::size_t last = ret.find_last_of("\\/");

    if (last != std::string::npos) ret = ret.substr(0, last);

    return ret;

}

// ------------------------------------------------------------------------------------------------