#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["realname"].empty() ||
           req.post["realid"].empty() ||
           req.post["realphone"].empty())
        {
            jsonfail(err_missing_parameter);
            break;
        }

        postval(account);
        postval(realname);
        postval(realid);
        postval(realphone);

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

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

        /// Check if user exist
        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,"Step 1");
            break;
        }

        if(count_val!=1)
        {
            jsonfail(err_data,"user not exist");
            break;
        }

        /// Check if user need enable
        int permission_level;
        int account_status;
        if(conn.exec(make_str("select permission_level,account_status from bs_user where username='",
                              account,
                              "'"),
                     [&](MySQLResult& res)
                     {
                         res.stepRow([&](char** val,unsigned long* len)
                                     {
                                         permission_level=ParseInt(val[0]);
                                         account_status=ParseInt(val[1]);
                                    });
                     })<0)
        {
            jsonfail(err_sql,"Step 2");
            break;
        }

        if(permission_level!=3||account_status!=2)
        {
            /// Does not need enable
            j["success"]=2;
            j["errmsg"]="Enable is not needed";
            break;
        }

        /// Do Update
        if(conn.exec(make_str("insert into bs_reader values ('",
                              account,
                              "','",
                              realname,
                              "','",
                              realid,
                              "','",
                              realphone,
                              "',1,0,", /// LV, EXP
                              "0,0,0,", /// Borrow Limit, Borrow Used, Borrow Time Limit (This should be auto generated by Trigger)
                              "0,0)" /// Bonus, Balance
                              ),nullptr)<0)
        {
            jsonfail(err_sql,"Step 3");
            break;
        }

        if(conn.getAffectedRows()<1) /// FIXME: I'm not sure if trigger will affect more than 1 rows.
        {
            jsonfail(err_sql_logic,"Affected rows less than 1");
            break;
        }

        j["successs"]=1;
    }while(0);

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