#pragma once
#include <iostream>
#include <windows.h>
#include <wininet.h>
#include <map>
#include <functional>
using namespace std;

//每次读取的字节数
#define READ_BUFFER_SIZE        4096

enum HttpInterfaceError
{
    Hir_Success = 0,        //成功
    Hir_InitErr,            //初始化失败
    Hir_ConnectErr,            //连接HTTP服务器失败
    Hir_SendErr,            //发送请求失败
    Hir_QueryErr,            //查询HTTP请求头失败
    Hir_404,                //页面不存在
    Hir_IllegalUrl,            //无效的URL
    Hir_CreateFileErr,        //创建文件失败
    Hir_DownloadErr,        //下载失败
    Hir_QueryIPErr,            //获取域名对应的地址失败
    Hir_SocketErr,            //套接字错误
    Hir_UserCancel,            //用户取消下载
    Hir_BufferErr,            //文件太大，缓冲区不足
    Hir_HeaderErr,            //HTTP请求头错误
    Hir_ParamErr,            //参数错误，空指针，空字符
    Hir_UnknowErr,
};
enum HttpRequest
{
    Hr_Get,
    Hr_Post
};

class CWininetHttp
{
public:
    //单例模式
    static CWininetHttp& getInstance()
    {
        static CWininetHttp m_winHttp;
        return m_winHttp;
    }
    CWininetHttp(const CWininetHttp&) = delete;
    CWininetHttp& operator =(const CWininetHttp&) = delete;
    ~CWininetHttp(void);

    //同步获取http请求
    string synRequestInfo(const string& lpUrl, HttpRequest type, map<string, string> param = map<string, string>());
    //异步获取http请求
    void asynRequestInfo(const string& lpUrl, HttpRequest type, map<string, string> param, std::function<void(string)> callBack);
private:
    CWininetHttp(void);
    //  通过HTTP请求：Get或Post方式获取JSON信息 [3/14/2017/shike]
    const std::string RequestJsonInfo(const std::string& strUrl,
        HttpRequest type = Hr_Get,
        std::string lpHeader = "",
        std::string lpPostData = "");

    string getUrl(const string& lpUrl, map<string, string> param);

    void asynRequestThread(string totalUrl, HttpRequest type);

    // 关闭句柄 
    void Release();

    // 释放句柄
    void ReleaseHandle(HINTERNET& hInternet);

    // 解析URL地址 
    void ParseURLWeb(std::string strUrl, std::string& strHostName, std::string& strPageName, WORD& sPort);

    // UTF-8转为GBK2312
    char* UtfToGbk(const char* utf8);

private:
    HINTERNET            m_hSession;
    HINTERNET            m_hConnect;
    HINTERNET            m_hRequest;
    HttpInterfaceError    m_error;
    std::function<void(string)> callBack = NULL;
};