/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsVersionComparator_h__
#define nsVersionComparator_h__

#include <stdlib.h>
#include <string.h>
#include <assert.h>
#if defined(_WIN32) && !defined(UPDATER_NO_STRING_GLUE_STL)
#include <wchar.h>
#include <stdint.h>

#endif

/**
 * In order to compare version numbers in Mozilla, you need to use the
 * mozilla::Version class.  You can construct an object of this type by passing
 * in a string version number to the constructor.  Objects of this type can be
 * compared using the standard comparison operators.
 *
 * For example, let's say that you want to make sure that a given version
 * number is not older than 15.a2.  Here's how you would write a function to
 * do that.
 *
 * bool IsVersionValid(const char* version) {
 *   return mozilla::Version("15.a2") <= mozilla::Version(version);
 * }
 *
 * Or, since Version's constructor is implicit, you can simplify this code:
 *
 * bool IsVersionValid(const char* version) {
 *   return mozilla::Version("15.a2") <= version;
 * }
 *
 * On Windows, if your version strings are wide characters, you should use the
 * mozilla::VersionW variant instead.  The semantics of that class is the same
 * as Version.
 */

namespace mozilla {

int32_t CompareVersions(const char* aStrA, const char* aStrB);

#ifdef _WIN32
int32_t CompareVersions(const wchar_t* aStrA, const wchar_t* aStrB);
#endif

struct Version
{
    explicit Version(const char* aVersionString)
    {
        versionContent = strdup(aVersionString);
    }

    const char* ReadContent() const
    {
        return versionContent;
    }

    ~Version()
    {
        free(versionContent);
    }

    bool operator<(const Version& aRhs) const
    {
        return CompareVersions(versionContent, aRhs.ReadContent()) == -1;
    }
    bool operator<=(const Version& aRhs) const
    {
        return CompareVersions(versionContent, aRhs.ReadContent()) < 1;
    }
    bool operator>(const Version& aRhs) const
    {
        return CompareVersions(versionContent, aRhs.ReadContent()) == 1;
    }
    bool operator>=(const Version& aRhs) const
    {
        return CompareVersions(versionContent, aRhs.ReadContent()) > -1;
    }
    bool operator==(const Version& aRhs) const
    {
        return CompareVersions(versionContent, aRhs.ReadContent()) == 0;
    }
    bool operator!=(const Version& aRhs) const
    {
        return CompareVersions(versionContent, aRhs.ReadContent()) != 0;
    }
    bool operator<(const char* aRhs) const
    {
        return CompareVersions(versionContent, aRhs) == -1;
    }
    bool operator<=(const char* aRhs) const
    {
        return CompareVersions(versionContent, aRhs) < 1;
    }
    bool operator>(const char* aRhs) const
    {
        return CompareVersions(versionContent, aRhs) == 1;
    }
    bool operator>=(const char* aRhs) const
    {
        return CompareVersions(versionContent, aRhs) > -1;
    }
    bool operator==(const char* aRhs) const
    {
        return CompareVersions(versionContent, aRhs) == 0;
    }
    bool operator!=(const char* aRhs) const
    {
        return CompareVersions(versionContent, aRhs) != 0;
    }

private:
    char* versionContent;
};

#ifdef _WIN32
struct VersionW
{
    explicit VersionW(const wchar_t* aVersionStringW)
    {
        versionContentW =
            reinterpret_cast<wchar_t*>(wcsdup(aVersionStringW));
    }

    const wchar_t* ReadContentW() const
    {
        return versionContentW;
    }

    ~VersionW()
    {
        free(versionContentW);
    }

    bool operator<(const VersionW& aRhs) const
    {
        return CompareVersions(versionContentW, aRhs.ReadContentW()) == -1;
    }
    bool operator<=(const VersionW& aRhs) const
    {
        return CompareVersions(versionContentW, aRhs.ReadContentW()) < 1;
    }
    bool operator>(const VersionW& aRhs) const
    {
        return CompareVersions(versionContentW, aRhs.ReadContentW()) == 1;
    }
    bool operator>=(const VersionW& aRhs) const
    {
        return CompareVersions(versionContentW, aRhs.ReadContentW()) > -1;
    }
    bool operator==(const VersionW& aRhs) const
    {
        return CompareVersions(versionContentW, aRhs.ReadContentW()) == 0;
    }
    bool operator!=(const VersionW& aRhs) const
    {
        return CompareVersions(versionContentW, aRhs.ReadContentW()) != 0;
    }

private:
    wchar_t* versionContentW;
};
#endif

} // namespace mozilla

#endif // nsVersionComparator_h__