/** bm-do-install.cgi
*   Work with bm-install.html --Ajax/Post--> bm-do-install.cgi --Json--> bm-install.html --> Jump to...
*
*   Book Manager Quick Installer
*/

#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <string>
#include <sstream>
#include <fstream>
#include <iostream>
#include <vector>
#include "Request.h"
#include "Response.h"
#include "Util.h"
#include "MySQLWrapper.h"
#include "json.hpp"
using namespace std;
using json=nlohmann::json;

int doInstall(const string& dbaddr,const string& dbuser,const string& dbpass,const string& dbname,int dbport,const vector<string>& sql,
              int& errcode,string& errmsg)
{
    MySQLConn conn;
    int ret=conn.connect(dbaddr.c_str(),dbuser.c_str(),dbpass.c_str(),dbname.c_str(),dbport);
    if(ret==-1)
    {
        errcode=conn.getErrCode();
        errmsg=conn.getError();
        return -1;
    }

    conn.exec("set names utf8",nullptr);

    int sz=sql.size();
    for(int i=0;i<sz;i++)
    {
        ret=conn.exec(sql[i],nullptr);
        if(ret<0)
        {
            errcode=conn.getErrCode();
            errmsg=conn.getError();
            return -2;
        }
    }

    return 0;
}

static vector<string> splitMultiSQL(const string& multisql)
{
    vector<string> vec;
    int len=multisql.size();
    string sql;
    for(int i=0;i<len;i++)
    {
        if(multisql[i]==';')
        {
            vec.push_back(sql);
            sql.clear();
        }
        else
        {
            sql.push_back(multisql[i]);
        }
    }
    if(!sql.empty())
    {
        vec.push_back(sql);
    }

    return vec;
}

template<typename T>
void _do_make_str(ostringstream& ostr,T&& x)
{
    ostr<<x;
}

void _do_make_str(ostringstream& ostr)
{

}

template<typename T,typename... Args>
void _do_make_str(ostringstream& ostr,T&& x,Args&&... args)
{
    ostr<<x;
    _do_make_str(ostr,args...);
}

template<typename... Args>
string make_str(Args&&... args)
{
    ostringstream ostr;
    _do_make_str(ostr,args...);
    return ostr.str();
}

int main()
{
    Request req;
    Response res;
    res.contentType="text/json;charset=utf-8";
    json j;
    if(req.requestMethod=="GET")
    {
        j["success"]=0;
        j["errcode"]=1;
        j["errmsg"]=make_str("GET Method Not Supported.");
    }
    else if(req.requestMethod=="POST")
    {
        if(!req.post["dbaddr"].empty() &&
           !req.post["dbport"].empty() &&
           !req.post["dbuser"].empty() &&
           !req.post["dbpass"].empty() &&
           !req.post["dbname"].empty() &&
           !req.post["tbprefix"].empty() &&
           !req.post["supass"].empty())
        {
            string s=getFileContent("setup.sql");
            replaceFlag(s,"{prefix}",req.post["tbprefix"]);
            vector<string> vec=splitMultiSQL(s);
            vec.push_back(make_str("insert into ",req.post["tbprefix"],"_user values ('root','",req.post["supass"],"','SuperUser',0,3) "));
            int ecode;
            string emsg;
            int ret=doInstall(req.post["dbaddr"],req.post["dbuser"],req.post["dbpass"],req.post["dbname"],ParseInt(req.post["dbport"]),vec,
                              ecode,emsg);
            if(ret<0)
            {
                /// Error.
                j["success"]=0;
                j["errcode"]=ecode;
                j["errmsg"]=make_str("SQL Error: ",emsg);
            }
            else
            {
                j["success"]=1;
            }
        }
        else
        {
            j["success"]=0;
            j["errcode"]=2;
            j["errmsg"]=make_str("Failed to parse parameters. Please retry.");
        }
    }
    res.content.append(j.dump());

    res.show();

    return 0;
}