/*
 * .============.
 * // M A K E / \
 * // C++ DEV / \
 * // E A S Y / \/ \
 * ++ ----------. \/\ .
 * \\ \ \ /\ /
 * \\ \ \ /
 * \\ \ \ /
 * -============'
 *
 * Copyright (c) 2018 Hevake and contributors, all rights reserved.
 *
 * This file is part of cpp-tbox (https://github.com/cpp-main/cpp-tbox)
 * Use of this source code is governed by MIT license that can be found
 * in the LICENSE file in the root of the source tree. All contributing
 * project authors may be found in the CONTRIBUTORS.md file in the root
 * of the source tree.
 */
#include "json.h"

#include <fstream>

#include <tbox/base/json.hpp>
#include <tbox/base/assert.h>

namespace tbox {
namespace util {
namespace json {

bool Get(const Json &js, bool &field_value)
{
 if (!js.is_boolean())
 return false;
 field_value = js.get<bool>();
 return true;
}

bool Get(const Json &js, unsigned int &field_value) {
 if (!js.is_number_unsigned())
 return false;
 field_value = js.get<unsigned int>();
 return true;
}

bool Get(const Json &js, double &field_value)
{
 if (!js.is_number())
 return false;
 field_value = js.get<double>();
 return true;
}

bool Get(const Json &js, std::string &field_value)
{
 if (!js.is_string())
 return false;
 field_value = js.get<std::string>();
 return true;
}

bool Get(const Json &js,int &field_value)
{
 if (!js.is_number_integer())
 return false;
 field_value = js.get<int>();
 return true;
}

bool GetField(const Json &js, const std::string &field_name, bool &field_value)
{
 if (!js.contains(field_name))
 return false;
 return Get(js.at(field_name), field_value);
}

bool GetField(const Json &js, const std::string &field_name, unsigned int &field_value)
{
 if (!js.contains(field_name))
 return false;
 return Get(js.at(field_name), field_value);
}

bool GetField(const Json &js, const std::string &field_name, int &field_value)
{
 if (!js.contains(field_name))
 return false;
 return Get(js.at(field_name), field_value);
}

bool GetField(const Json &js, const std::string &field_name, double &field_value)
{
 if (!js.contains(field_name))
 return false;
 return Get(js.at(field_name), field_value);
}

bool GetField(const Json &js, const std::string &field_name, std::string &field_value)
{
 if (!js.contains(field_name))
 return false;
 return Get(js.at(field_name), field_value);
}

bool HasObjectField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_object();
}

bool HasArrayField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_array();
}

bool HasBooleanField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_boolean();
}

bool HasNumberField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_number();
}

bool HasFloatField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_number_float();
}

bool HasIntegerField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_number_integer();
}

bool HasUnsignedField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_number_unsigned();
}

bool HasStringField(const Json &js, const std::string &field_name)
{
 if (!js.contains(field_name))
 return false;
 auto &js_field = js.at(field_name);
 return js_field.is_string();
}

Json Load(const std::string &filename)
{
 Json js;
 std::ifstream input_json_file(filename);
 if (input_json_file.is_open()) {
 try {
 input_json_file >> js;
 } catch (const std::exception &e) {
 throw ParseJsonFileError(filename, e.what());
 }
 } else {
 throw OpenFileError(filename);
 }

 return js;
}

/**
 * 通过数[],{},"的方式找JSON字串的结束位置
 */
int FindEndPos(const char *str_ptr, size_t str_len)
{
 TBOX_ASSERT(str_ptr != nullptr);

 bool is_started = false;//! 是否已开始,防止开头是空格或TAB
 int braces_level = 0; //! 花括号的层级
 int square_level = 0; //! 方括号的层级
 bool in_string = false; //! 是否在字串中

 for (size_t i = 0; i < str_len; ++i) {
 char ch = str_ptr[i];
 if (!is_started && ::isgraph(ch))
 is_started = true;

 if (ch == '"') {
 if (in_string) {
 //! 要防止 \" 与 \\" \\\\\" 这些转义符的情况
 //! 如果 " 前面是连续的 \ 那就对应数 \ 的个数。如果是单数,则"失效
 in_string = false;
 for (size_t j = (i - 1); j != 0 && str_ptr[j] == '\\'; --j)
 in_string = !in_string;
 } else {
 in_string = true;
 }
 } else {
 if (in_string) //! 如果在字串里,就直接略过
 continue;

 switch (ch) {
 case '[': ++square_level; break;
 case ']': --square_level; break;
 case '{': ++braces_level; break;
 case '}': --braces_level; break;
 }
 }

 if (braces_level == 0 &&
 square_level == 0 &&
 !in_string &&
 is_started) {
 return i + 1;
 }

 if (braces_level < 0 || square_level < 0)
 return -1;
 }

 return 0;
}

}
}
}