/****************************************************************************
 Copyright (c) 2013-2017 Chukong Technologies
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.

 http://www.cocos2d-x.org

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
****************************************************************************/

#include "base/CCValue.h"
#include <cmath>
#include <sstream>
#include <iomanip>
#include "base/ccUtils.h"

NS_CC_BEGIN

const ValueVector ValueVectorNull;
const ValueMap ValueMapNull;
const ValueMapIntKey ValueMapIntKeyNull;

const Value Value::Null;

const std::string Value::NullString;

Value::Value()
: _type(Type::NONE)
{
    memset(&_field, 0, sizeof(_field));
}

Value::Value(unsigned char v)
: _type(Type::BYTE)
{
    _field.byteVal = v;
}

Value::Value(int v)
: _type(Type::INTEGER)
{
    _field.intVal = v;
}

Value::Value(unsigned int v)
: _type(Type::UNSIGNED)
{
    _field.unsignedVal = v;
}

Value::Value(float v)
: _type(Type::FLOAT)
{
    _field.floatVal = v;
}

Value::Value(double v)
: _type(Type::DOUBLE)
{
    _field.doubleVal = v;
}

Value::Value(bool v)
: _type(Type::BOOLEAN)
{
    _field.boolVal = v;
}

Value::Value(const char* v)
: _type(Type::STRING)
{
    _field.strVal = new (std::nothrow) std::string(v ? v : "");
}

Value::Value(const std::string& v)
: _type(Type::STRING)
{
    _field.strVal = new (std::nothrow) std::string(v);
}

Value::Value(std::string&& v) : _type(Type::STRING) {
    _field.strVal = new (std::nothrow) std::string(std::move(v));
}

Value::Value(const ValueVector& v)
: _type(Type::VECTOR)
{
    _field.vectorVal  = new (std::nothrow) ValueVector(v);
}

Value::Value(ValueVector&& v)
: _type(Type::VECTOR)
{
    _field.vectorVal  = new (std::nothrow) ValueVector(std::move(v));
}

Value::Value(const ValueMap& v)
: _type(Type::MAP)
{
    _field.mapVal = new (std::nothrow) ValueMap(v);
}

Value::Value(ValueMap&& v)
: _type(Type::MAP)
{
    _field.mapVal  = new (std::nothrow) ValueMap(std::move(v));
}

Value::Value(const ValueMapIntKey& v)
: _type(Type::INT_KEY_MAP)
{
    _field.intKeyMapVal  = new (std::nothrow) ValueMapIntKey(v);
}

Value::Value(ValueMapIntKey&& v)
: _type(Type::INT_KEY_MAP)
{
    _field.intKeyMapVal  = new (std::nothrow) ValueMapIntKey(std::move(v));
}

Value::Value(const Value& other)
: _type(Type::NONE)
{
    *this = other;
}

Value::Value(Value&& other)
: _type(Type::NONE)
{
    *this = std::move(other);
}

Value::~Value()
{
    clear();
}

Value& Value::operator= (const Value& other)
{
    if (this != &other) {
        reset(other._type);

        switch (other._type) {
            case Type::BYTE:
                _field.byteVal = other._field.byteVal;
                break;
            case Type::INTEGER:
                _field.intVal = other._field.intVal;
                break;
            case Type::UNSIGNED:
                _field.unsignedVal = other._field.unsignedVal;
                break;
            case Type::FLOAT:
                _field.floatVal = other._field.floatVal;
                break;
            case Type::DOUBLE:
                _field.doubleVal = other._field.doubleVal;
                break;
            case Type::BOOLEAN:
                _field.boolVal = other._field.boolVal;
                break;
            case Type::STRING:
                if (_field.strVal == nullptr)
                {
                    _field.strVal = new std::string();
                }
                *_field.strVal = *other._field.strVal;
                break;
            case Type::VECTOR:
                if (_field.vectorVal == nullptr)
                {
                    _field.vectorVal = new (std::nothrow) ValueVector();
                }
                *_field.vectorVal = *other._field.vectorVal;
                break;
            case Type::MAP:
                if (_field.mapVal == nullptr)
                {
                    _field.mapVal = new (std::nothrow) ValueMap();
                }
                *_field.mapVal = *other._field.mapVal;
                break;
            case Type::INT_KEY_MAP:
                if (_field.intKeyMapVal == nullptr)
                {
                    _field.intKeyMapVal = new (std::nothrow) ValueMapIntKey();
                }
                *_field.intKeyMapVal = *other._field.intKeyMapVal;
                break;
            default:
                break;
        }
    }
    return *this;
}

Value& Value::operator= (Value&& other)
{
    if (this != &other)
    {
        clear();
        switch (other._type)
        {
            case Type::BYTE:
                _field.byteVal = other._field.byteVal;
                break;
            case Type::INTEGER:
                _field.intVal = other._field.intVal;
                break;
            case Type::UNSIGNED:
                _field.unsignedVal = other._field.unsignedVal;
                break;
            case Type::FLOAT:
                _field.floatVal = other._field.floatVal;
                break;
            case Type::DOUBLE:
                _field.doubleVal = other._field.doubleVal;
                break;
            case Type::BOOLEAN:
                _field.boolVal = other._field.boolVal;
                break;
            case Type::STRING:
                _field.strVal = other._field.strVal;
                break;
            case Type::VECTOR:
                _field.vectorVal = other._field.vectorVal;
                break;
            case Type::MAP:
                _field.mapVal = other._field.mapVal;
                break;
            case Type::INT_KEY_MAP:
                _field.intKeyMapVal = other._field.intKeyMapVal;
                break;
            default:
                break;
        }
        _type = other._type;

        memset(&other._field, 0, sizeof(other._field));
        other._type = Type::NONE;
    }

    return *this;
}

Value& Value::operator= (unsigned char v)
{
    reset(Type::BYTE);
    _field.byteVal = v;
    return *this;
}

Value& Value::operator= (int v)
{
    reset(Type::INTEGER);
    _field.intVal = v;
    return *this;
}

Value& Value::operator= (unsigned int v)
{
    reset(Type::UNSIGNED);
    _field.unsignedVal = v;
    return *this;
}

Value& Value::operator= (float v)
{
    reset(Type::FLOAT);
    _field.floatVal = v;
    return *this;
}

Value& Value::operator= (double v)
{
    reset(Type::DOUBLE);
    _field.doubleVal = v;
    return *this;
}

Value& Value::operator= (bool v)
{
    reset(Type::BOOLEAN);
    _field.boolVal = v;
    return *this;
}

Value& Value::operator= (const char* v)
{
    reset(Type::STRING);
    *_field.strVal = v ? v : "";
    return *this;
}

Value& Value::operator= (const std::string& v)
{
    reset(Type::STRING);
    *_field.strVal = v;
    return *this;
}

Value& Value::operator=(std::string&& v) {
    reset(Type::STRING);
    *_field.strVal = std::move(v);
    return* this;
}

Value& Value::operator= (const ValueVector& v)
{
    reset(Type::VECTOR);
    *_field.vectorVal = v;
    return *this;
}

Value& Value::operator= (ValueVector&& v)
{
    reset(Type::VECTOR);
    *_field.vectorVal = std::move(v);
    return *this;
}

Value& Value::operator= (const ValueMap& v)
{
    reset(Type::MAP);
    *_field.mapVal = v;
    return *this;
}

Value& Value::operator= (ValueMap&& v)
{
    reset(Type::MAP);
    *_field.mapVal = std::move(v);
    return *this;
}

Value& Value::operator= (const ValueMapIntKey& v)
{
    reset(Type::INT_KEY_MAP);
    *_field.intKeyMapVal = v;
    return *this;
}

Value& Value::operator= (ValueMapIntKey&& v)
{
    reset(Type::INT_KEY_MAP);
    *_field.intKeyMapVal = std::move(v);
    return *this;
}

bool Value::operator!= (const Value& v)
{
    return !(*this == v);
}
bool Value::operator!= (const Value& v) const
{
    return !(*this == v);
}

bool Value::operator== (const Value& v)
{
    const auto &t = *this;
    return t == v;
}
bool Value::operator== (const Value& v) const
{
    if (this == &v) return true;
    if (v._type != this->_type) return false;
    if (this->isNull()) return true;
    switch (_type)
    {
        case Type::BYTE:    return v._field.byteVal     == this->_field.byteVal;
        case Type::INTEGER: return v._field.intVal      == this->_field.intVal;
        case Type::UNSIGNED:return v._field.unsignedVal == this->_field.unsignedVal;
        case Type::BOOLEAN: return v._field.boolVal     == this->_field.boolVal;
        case Type::STRING:  return *v._field.strVal     == *this->_field.strVal;
        case Type::FLOAT:   return std::abs(v._field.floatVal  - this->_field.floatVal)  <= FLT_EPSILON;
        case Type::DOUBLE:  return std::abs(v._field.doubleVal - this->_field.doubleVal) <= DBL_EPSILON;
        case Type::VECTOR:
        {
            const auto &v1 = *(this->_field.vectorVal);
            const auto &v2 = *(v._field.vectorVal);
            const auto size = v1.size();
            if (size == v2.size())
            {
                for (size_t i = 0; i < size; i++)
                {
                    if (v1[i] != v2[i]) return false;
                }
                return true;
            }
            return false;
        }
        case Type::MAP:
        {
            const auto &map1 = *(this->_field.mapVal);
            const auto &map2 = *(v._field.mapVal);
            for (const auto &kvp : map1)
            {
                auto it = map2.find(kvp.first);
                if (it == map2.end() || it->second != kvp.second)
                {
                    return false;
                }
            }
            return true;
        }
        case Type::INT_KEY_MAP:
        {
            const auto &map1 = *(this->_field.intKeyMapVal);
            const auto &map2 = *(v._field.intKeyMapVal);
            for (const auto &kvp : map1)
            {
                auto it = map2.find(kvp.first);
                if (it == map2.end() || it->second != kvp.second)
                {
                    return false;
                }
            }
            return true;
        }
        default:
            break;
    };

    return false;
}

/// Convert value to a specified type
unsigned char Value::asByte() const
{
    CCASSERT(_type != Type::VECTOR && _type != Type::MAP && _type != Type::INT_KEY_MAP, "Only base type (bool, string, float, double, int) could be converted");

    switch (_type) {
    case Type::BYTE:
        return _field.byteVal;
    case Type::INTEGER:
        return static_cast<unsigned char>(_field.intVal);

    case Type::UNSIGNED:
        return static_cast<unsigned char>(_field.unsignedVal);

    case Type::STRING:
        return static_cast<unsigned char>(atoi(_field.strVal->c_str()));

    case Type::FLOAT:
        return static_cast<unsigned char>(_field.floatVal);

    case Type::DOUBLE:
        return static_cast<unsigned char>(_field.doubleVal);

    case Type::BOOLEAN:
        return _field.boolVal ? 1 : 0;
    }

    return 0;
}

int Value::asInt() const
{
    CCASSERT(_type != Type::VECTOR && _type != Type::MAP && _type != Type::INT_KEY_MAP, "Only base type (bool, string, float, double, int) could be converted");
    switch (_type) {
    case Type::INTEGER:
        return _field.intVal;

    case Type::UNSIGNED:
        CCASSERT(_field.unsignedVal < INT_MAX, "Can only convert values < INT_MAX");
        return (int)_field.unsignedVal;

    case Type::BYTE:
        return _field.byteVal;

    case Type::STRING:
        return atoi(_field.strVal->c_str());

    case Type::FLOAT:
        return static_cast<int>(_field.floatVal);

    case Type::DOUBLE:
        return static_cast<int>(_field.doubleVal);

    case Type::BOOLEAN:
        return _field.boolVal ? 1 : 0;
    }
    return 0;
}


unsigned int Value::asUnsignedInt() const
{
    CCASSERT(_type != Type::VECTOR && _type != Type::MAP && _type != Type::INT_KEY_MAP, "Only base type (bool, string, float, double, int) could be converted");
    switch (_type) {
    case Type::UNSIGNED:
        return _field.unsignedVal;

    case Type::INTEGER:
        CCASSERT(_field.intVal >= 0, "Only values >= 0 can be converted to unsigned");
        return static_cast<unsigned int>(_field.intVal);

    case Type::BYTE:
        return static_cast<unsigned int>(_field.byteVal);

    case Type::STRING:
        // NOTE: strtoul is required (need to augment on unsupported platforms)
        return static_cast<unsigned int>(strtoul(_field.strVal->c_str(), nullptr, 10));

    case Type::FLOAT:
        return static_cast<unsigned int>(_field.floatVal);

    case Type::DOUBLE:
        return static_cast<unsigned int>(_field.doubleVal);

    case Type::BOOLEAN:
        return _field.boolVal ? 1u : 0u;
    }

    return 0u;
}

float Value::asFloat() const
{
    CCASSERT(_type != Type::VECTOR && _type != Type::MAP && _type != Type::INT_KEY_MAP, "Only base type (bool, string, float, double, int) could be converted");
    switch (_type) {
    case Type::FLOAT:
        return _field.floatVal;

    case Type::BYTE:
        return static_cast<float>(_field.byteVal);

    case Type::STRING:
        return static_cast<float>(utils::atof(_field.strVal->c_str()));

    case Type::INTEGER:
        return static_cast<float>(_field.intVal);

    case Type::UNSIGNED:
        return static_cast<float>(_field.unsignedVal);

    case Type::DOUBLE:
        return static_cast<float>(_field.doubleVal);

    case Type::BOOLEAN:
        return _field.boolVal ? 1.0f : 0.0f;
    }
    return 0.0f;
}

double Value::asDouble() const
{
    CCASSERT(_type != Type::VECTOR && _type != Type::MAP && _type != Type::INT_KEY_MAP, "Only base type (bool, string, float, double, int) could be converted");
    switch (_type) {
    case Type::DOUBLE:
        return _field.doubleVal;

    case Type::BYTE:
        return static_cast<double>(_field.byteVal);

    case Type::STRING:
        return static_cast<double>(utils::atof(_field.strVal->c_str()));

    case Type::INTEGER:
        return static_cast<double>(_field.intVal);

    case Type::UNSIGNED:
        return static_cast<double>(_field.unsignedVal);

    case Type::FLOAT:
        return static_cast<double>(_field.floatVal);

    case Type::BOOLEAN:
        return _field.boolVal ? 1.0 : 0.0;
    }
    return 0.0;
}

bool Value::asBool() const
{
    CCASSERT(_type != Type::VECTOR && _type != Type::MAP && _type != Type::INT_KEY_MAP, "Only base type (bool, string, float, double, int) could be converted");
    switch (_type) {
    case Type::BOOLEAN:
        return _field.boolVal;

    case Type::BYTE:
        return _field.byteVal == 0 ? false : true;

    case Type::STRING:
        return (*_field.strVal == "0" || *_field.strVal == "false") ? false : true;

    case Type::INTEGER:
        return _field.intVal == 0 ? false : true;

    case Type::UNSIGNED:
        return _field.unsignedVal == 0 ? false : true;

    case Type::FLOAT:
        return _field.floatVal == 0.0f ? false : true;

    case Type::DOUBLE:
        return _field.doubleVal == 0.0 ? false : true;
    }

    return false;
}

std::string Value::asString() const
{
    CCASSERT(_type != Type::VECTOR && _type != Type::MAP && _type != Type::INT_KEY_MAP, "Only base type (bool, string, float, double, int) could be converted");

    if (_type == Type::STRING)
    {
        return *_field.strVal;
    }

    enum { NUMBER_MAX_DIGITS = 63 };

    std::string ret;
    size_t n = 0;
    switch (_type)
    {
        case Type::BYTE:
            ret = std::to_string(_field.byteVal);
            break;
        case Type::INTEGER:
            ret = std::to_string(_field.intVal);
            break;
        case Type::UNSIGNED:
            ret = std::to_string(_field.unsignedVal);
            break;
        case Type::FLOAT:
            ret.resize(NUMBER_MAX_DIGITS);
            n = snprintf(&ret.front(), NUMBER_MAX_DIGITS + 1, "%.*g", 7/*precision*/, _field.floatVal);
            if (n > 0) ret.resize(n);
            break;
        case Type::DOUBLE:
            ret.resize(NUMBER_MAX_DIGITS);
            n = snprintf(&ret.front(), NUMBER_MAX_DIGITS + 1, "%.*g", 17/*precision*/, _field.doubleVal);
            if (n > 0) ret.resize(n);
            break;
        case Type::BOOLEAN:
            ret = (_field.boolVal ? "true" : "false");
            break;
        default:
            break;
    }
    return ret;
}

const std::string& Value::asStringRef() const
{
    if (_type == Type::STRING)
        return *_field.strVal;
    return Value::NullString;
}

ValueVector& Value::asValueVector()
{
    CCASSERT(_type == Type::VECTOR, "The value type isn't Type::VECTOR");
    return *_field.vectorVal;
}

const ValueVector& Value::asValueVector() const
{
    CCASSERT(_type == Type::VECTOR, "The value type isn't Type::VECTOR");
    return *_field.vectorVal;
}

ValueMap& Value::asValueMap()
{
    CCASSERT(_type == Type::MAP, "The value type isn't Type::MAP");
    return *_field.mapVal;
}

const ValueMap& Value::asValueMap() const
{
    CCASSERT(_type == Type::MAP, "The value type isn't Type::MAP");
    return *_field.mapVal;
}

ValueMapIntKey& Value::asIntKeyMap()
{
    CCASSERT(_type == Type::INT_KEY_MAP, "The value type isn't Type::INT_KEY_MAP");
    return *_field.intKeyMapVal;
}

const ValueMapIntKey& Value::asIntKeyMap() const
{
    CCASSERT(_type == Type::INT_KEY_MAP, "The value type isn't Type::INT_KEY_MAP");
    return *_field.intKeyMapVal;
}

static std::string getTabs(int depth)
{
    std::string tabWidth;

    for (int i = 0; i < depth; ++i)
    {
        tabWidth += "\t";
    }

    return tabWidth;
}

static std::string visit(const Value& v, int depth);

static std::string visitVector(const ValueVector& v, int depth)
{
    std::stringstream ret;

    if (depth > 0)
        ret << "\n";

    ret << getTabs(depth) << "[\n";

    int i = 0;
    for (const auto& child : v)
    {
        ret << getTabs(depth+1) << i << ": " << visit(child, depth + 1);
        ++i;
    }

    ret << getTabs(depth) << "]\n";

    return ret.str();
}

template <class T>
static std::string visitMap(const T& v, int depth)
{
    std::stringstream ret;

    if (depth > 0)
        ret << "\n";

    ret << getTabs(depth) << "{\n";

    for (auto& iter : v)
    {
        ret << getTabs(depth + 1) << iter.first << ": ";
        ret << visit(iter.second, depth + 1);
    }

    ret << getTabs(depth) << "}\n";

    return ret.str();
}

static std::string visit(const Value& v, int depth)
{
    std::stringstream ret;

    switch (v.getType())
    {
        case Value::Type::NONE:
        case Value::Type::BYTE:
        case Value::Type::INTEGER:
        case Value::Type::UNSIGNED:
        case Value::Type::FLOAT:
        case Value::Type::DOUBLE:
        case Value::Type::BOOLEAN:
        case Value::Type::STRING:
            ret << v.asString() << "\n";
            break;
        case Value::Type::VECTOR:
            ret << visitVector(v.asValueVector(), depth);
            break;
        case Value::Type::MAP:
            ret << visitMap(v.asValueMap(), depth);
            break;
        case Value::Type::INT_KEY_MAP:
            ret << visitMap(v.asIntKeyMap(), depth);
            break;
        default:
            CCASSERT(false, "Invalid type!");
            break;
    }

    return ret.str();
}

std::string Value::getDescription() const
{
    std::string ret("\n");
    ret += visit(*this, 0);
    return ret;
}

void Value::clear()
{
    // Free memory the old value allocated
    switch (_type)
    {
        case Type::BYTE:
            _field.byteVal = 0;
            break;
        case Type::INTEGER:
            _field.intVal = 0;
            break;
        case Type::UNSIGNED:
            _field.unsignedVal = 0u;
            break;
        case Type::FLOAT:
            _field.floatVal = 0.0f;
            break;
        case Type::DOUBLE:
            _field.doubleVal = 0.0;
            break;
        case Type::BOOLEAN:
            _field.boolVal = false;
            break;
        case Type::STRING:
            CC_SAFE_DELETE(_field.strVal);
            break;
        case Type::VECTOR:
            CC_SAFE_DELETE(_field.vectorVal);
            break;
        case Type::MAP:
            CC_SAFE_DELETE(_field.mapVal);
            break;
        case Type::INT_KEY_MAP:
            CC_SAFE_DELETE(_field.intKeyMapVal);
            break;
        default:
            break;
    }

    _type = Type::NONE;
}

void Value::reset(Type type)
{
    if (_type == type)
        return;

    clear();

    // Allocate memory for the new value
    switch (type)
    {
        case Type::STRING:
            _field.strVal = new (std::nothrow) std::string();
            break;
        case Type::VECTOR:
            _field.vectorVal = new (std::nothrow) ValueVector();
            break;
        case Type::MAP:
            _field.mapVal = new (std::nothrow) ValueMap();
            break;
        case Type::INT_KEY_MAP:
            _field.intKeyMapVal = new (std::nothrow) ValueMapIntKey();
            break;
        default:
            break;
    }

    _type = type;
}

NS_CC_END