/*************************************************************************
	> File Name : CJudgeUtils.h
	> Author : FengChao
	> EMail : smile.fengchao@gmail.com 
	> Created Time : Fri 17 Jul 2020 09:34:47 AM CST
 ************************************************************************/

#ifndef _JUDGE_COMMON_H_
#define _JUDGE_COMMON_H_

#include <iostream>
#include <cstdio>
#include <map>
#include <set>
#include <string>
#include <stdint.h>
#include <pthread.h>
#include <mutex>
#include <memory>
#include "CLog.h"

class CNonCopyable
{
protected:
    CNonCopyable() {}
    ~CNonCopyable() {}
private:
    CNonCopyable(const CNonCopyable &);
    const CNonCopyable& operator=(const CNonCopyable &);
};

class CMutexLockGuard:CNonCopyable
{
 public:
    explicit CMutexLockGuard(pthread_mutex_t& mutex)
    : m_mutex(mutex)
    {
        pthread_mutex_lock(&m_mutex);
    }

    ~CMutexLockGuard()
    {
        pthread_mutex_unlock(&m_mutex);
    }

private:
    pthread_mutex_t& m_mutex;
};

template<class T>
class CSingleton 
{
private:
        static std::once_flag SingletonFlag;
        static std::unique_ptr<T> Instance;

protected:
        CSingleton() = default;
        CSingleton(const T&) = delete;
        CSingleton& operator=(const T&) = delete;

public:
        static T& GetInstance() 
		{
                std::call_once(SingletonFlag, [=]() {
                        Instance.reset(new T); 
                        }); 

                return *(Instance.get());
        }   
};

template <class T> std::unique_ptr<T> CSingleton <T>::Instance = nullptr;
template <class T> std::once_flag CSingleton <T>::SingletonFlag;

class INIReader 
{
public:
    explicit INIReader() {}
    ~INIReader() {}
    
    /// @brief 解析文件
    /// @return 0 成功
    /// @return <0 失败
    /// @note 每次调用会清除上一次的解析结果
    int32_t Parse(const std::string& filename);
    
    void Clear();
    
    /// @brief 获取string类型字段的值，字段未配置时使用默认值
    std::string Get(const std::string& section, const std::string& name,
                    const std::string& default_value);
    
    // Get an integer (long) value from INI file, returning default_value
    // if not found or not a valid integer (decimal "1234", "-1234",
    // or hex "0x4d2").
    int32_t GetInt32(const std::string& section, const std::string& name,
                    int32_t default_value);
    
    uint32_t GetUInt32(const std::string& section, const std::string& name,
                    uint32_t default_value);
    
    int64_t GetInt64(const std::string& section, const std::string& name,
                    int64_t default_value);
    
    uint64_t GetUInt64(const std::string& section, const std::string& name,
                    uint64_t default_value);
    
    // Get a real (floating point double) value from INI file, returning
    // default_value if not found or not a valid floating point value
    // according to strtod().
    double GetReal(const std::string& section, const std::string& name, double default_value);
    
    // Get a boolean value from INI file, returning default_value
    // if not found or if not a valid true/false value. Valid true
    // values are "true", "yes", "on", "1", and valid false values are
    // "false", "no", "off", "0" (not case sensitive).
    bool GetBoolean(const std::string& section, const std::string& name, bool default_value);
    
    // Returns all the section names from the INI file, in alphabetical order,
    // but in the original casing
    const std::set<std::string>& GetSections() const;
    
    // Returns all the field names from a section in the INI file, in
    // alphabetical order, but in the original casing. Returns an
    // empty set if the field name is unknown
    std::set<std::string> GetFields(const std::string& section);
    
    /// @brief 返回最后错误字符串描述
    /// @return 最后一次错误的信息
    const char* GetLastError() const { return m_last_error; }
private:
    int32_t ParseFile(FILE* file);
private:
    char m_last_error[256];
    std::set<std::string> m_sections;
    std::map<std::string, std::map<std::string, std::string> > m_fields;
};

#endif