#include "Session.h"
#include "Util.h"
#include "json.hpp"
#include "jsonfail.h"
using namespace std;
using json=nlohmann::json;

#define postval(NAME) string NAME=req.post[#NAME]

int main()
{
    Request req;
    Session se(req);
    Response res;
    json j;

    auto jsonfail=[&](int errcode,const string& detail="")
    {
        j["success"]=0;
        j["errcode"]=errcode;
        j["errmsg"]=string(GetErrMsg(errcode))+" : "+detail;
    };

    do
    {
        if(!se.isReady())
        {
            jsonfail(err_session);
            break;
        }
        if(!se.getUser().empty())
        {
            /// Logged in. Redirect user to dashboard.
            j["success"]=2;
            j["next_url"]="/booksys/dashboard.html";
            break;
        }

        if(req.requestMethod!="POST")
        {
            jsonfail(err_method_not_supported);
            break;
        }

        if(req.post["account"].empty() ||
           req.post["pass"].empty() ||
           req.post["nickname"].empty())
        {
            jsonfail(err_missing_parameter);
            break;
        }

        postval(account);
        postval(pass);
        postval(nickname);

        /// Connect DB
        DBInfo db;
        MySQLConn conn;
        if(db.readConfig()<0)
        {
            jsonfail(err_config);
            break;
        }

        if(db.connectProxy(conn)<0)
        {
            jsonfail(err_connect);
            break;
        }

        /// Check username conflict
        int count_val;
        if(conn.exec(make_str("select count(username) from bs_user where username='",
                              account,
                              "'"),
                     [&](MySQLResult& res)
                     {
                         res.stepRow([&](char** val,unsigned long* len)
                                     {
                                         count_val=ParseInt(val[0]);
                                     });
                     })<0)
        {
            jsonfail(err_sql);
            break;
        }

        if(count_val!=0)
        {
            jsonfail(err_data,"username conflict");
            break;
        }

        /// Do insert
        if(conn.exec(make_str("insert into bs_user values ('",
                              account,
                              "','",
                              pass,
                              "','",
                              nickname,
                              "',3,2"),nullptr)<0)
        {
            jsonfail(err_sql);
            break;
        }

        if(conn.getAffectedRows()!=1)
        {
            jsonfail(err_sql_logic,"Affected rows not equals 1");
            break;
        }

        /// Redirect user to enable page.
        j["success"]=1;
        j["next_url"]="/booksys/enable.html";
    }while(0);

    res.content.append(j.dump());
    res.show();
    return 0;
}