/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "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 ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#ifndef SPINE_STRING_H
#define SPINE_STRING_H

#include <spine/Extension.h>
#include <spine/SpineObject.h>

#include <stdio.h>
#include <string.h>

// Required for sprintf on MSVC
#ifdef _MSC_VER
    #pragma warning(disable : 4996)
#endif

namespace spine {
class SP_API String : public SpineObject {
public:
    String() : _length(0), _buffer(NULL) {
    }

    String(const char *chars, bool own = false) {
        if (!chars) {
            _length = 0;
            _buffer = NULL;
        } else {
            _length = strlen(chars);
            if (!own) {
                _buffer = SpineExtension::calloc<char>(_length + 1, __FILE__, __LINE__);
                memcpy((void *)_buffer, chars, _length + 1);
            } else {
                _buffer = (char *)chars;
            }
        }
    }

    String(const String &other) {
        if (!other._buffer) {
            _length = 0;
            _buffer = NULL;
        } else {
            _length = other._length;
            _buffer = SpineExtension::calloc<char>(other._length + 1, __FILE__, __LINE__);
            memcpy((void *)_buffer, other._buffer, other._length + 1);
        }
    }

    size_t length() const {
        return _length;
    }

    bool isEmpty() const {
        return _length == 0;
    }

    const char *buffer() const {
        return _buffer;
    }

    void own(const String &other) {
        if (this == &other) return;
        if (_buffer) {
            SpineExtension::free(_buffer, __FILE__, __LINE__);
        }
        _length = other._length;
        _buffer = other._buffer;
        other._length = 0;
        other._buffer = NULL;
    }

    void own(const char *chars) {
        if (_buffer == chars) return;
        if (_buffer) {
            SpineExtension::free(_buffer, __FILE__, __LINE__);
        }

        if (!chars) {
            _length = 0;
            _buffer = NULL;
        } else {
            _length = strlen(chars);
            _buffer = (char *)chars;
        }
    }

    void unown() {
        _length = 0;
        _buffer = NULL;
    }

    String &operator=(const String &other) {
        if (this == &other) return *this;
        if (_buffer) {
            SpineExtension::free(_buffer, __FILE__, __LINE__);
        }
        if (!other._buffer) {
            _length = 0;
            _buffer = NULL;
        } else {
            _length = other._length;
            _buffer = SpineExtension::calloc<char>(other._length + 1, __FILE__, __LINE__);
            memcpy((void *)_buffer, other._buffer, other._length + 1);
        }
        return *this;
    }

    String &operator=(const char *chars) {
        if (_buffer == chars) return *this;
        if (_buffer) {
            SpineExtension::free(_buffer, __FILE__, __LINE__);
        }
        if (!chars) {
            _length = 0;
            _buffer = NULL;
        } else {
            _length = strlen(chars);
            _buffer = SpineExtension::calloc<char>(_length + 1, __FILE__, __LINE__);
            memcpy((void *)_buffer, chars, _length + 1);
        }
        return *this;
    }

    String &append(const char *chars) {
        size_t len = strlen(chars);
        size_t thisLen = _length;
        _length = _length + len;
        bool same = chars == _buffer;
        _buffer = SpineExtension::realloc(_buffer, _length + 1, __FILE__, __LINE__);
        memcpy((void *)(_buffer + thisLen), (void *)(same ? _buffer : chars), len + 1);
        return *this;
    }

    String &append(const String &other) {
        size_t len = other.length();
        size_t thisLen = _length;
        _length = _length + len;
        bool same = other._buffer == _buffer;
        _buffer = SpineExtension::realloc(_buffer, _length + 1, __FILE__, __LINE__);
        memcpy((void *)(_buffer + thisLen), (void *)(same ? _buffer : other._buffer), len + 1);
        return *this;
    }

    String &append(int other) {
        char str[100];
        sprintf(str, "%i", other);
        append(str);
        return *this;
    }

    String &append(float other) {
        char str[100];
        sprintf(str, "%f", other);
        append(str);
        return *this;
    }

    friend bool operator==(const String &a, const String &b) {
        if (a._buffer == b._buffer) return true;
        if (a._length != b._length) return false;
        if (a._buffer && b._buffer) {
            return strcmp(a._buffer, b._buffer) == 0;
        } else {
            return false;
        }
    }

    friend bool operator!=(const String &a, const String &b) {
        return !(a == b);
    }

    ~String() {
        if (_buffer) {
            SpineExtension::free(_buffer, __FILE__, __LINE__);
        }
    }

private:
    mutable size_t _length;
    mutable char *_buffer;
};
} // namespace spine

#endif //SPINE_STRING_H
