#include "bs_util.h"
using namespace std;

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

    auto jsonfail=[&](int errcode,const std::string& dtl="")
    {
        jsonfail_func(j,errcode,dtl);
    };

    do
    {
        if(!se.isReady())
        {
            jsonfail(err_session);
            break;
        }

        if(se.getUser().empty())
        {
            jsonfail(err_need_login);
            break;
        }

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

        postval(bid);
        int bid_real=ParseInt(bid);
        if(bid_real<0)
        {
            jsonfail(err_parameter,"Failed to parse BID");
            break;
        }

        startdb();

        string book_name;
        if(conn.exec(make_str("select name from bs_book where class_id in (select class_id from bs_bookstatus where book_id=",bid_real,")"),
                     [&](MySQLResult& res)
                     {
                         res.stepRow([&](char** val,unsigned long* len)
                                     {
                                         j["book_name"]=string(len[0]>0?val[0]:"(NULL)");
                                     });
                     })<0)
        {
            jsonfail(err_sql,"Step 1");
            break;
        }

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

    se.writeToResponse(res);
    res.content.append(j.dump());

    return 0;
}