#include "bs_util.h"
#include "handler.h"
using namespace std;

map<int,function<void(Request& req,Session& se,Response& res,json& j)>> _handlers;

int RequestDispatch(Request& req,Session& se,Response& res,json& j,int Key)
{
    if(_handlers.find(Key)!=_handlers.end())
    {
        if(_handlers[Key])
        {
            j["RDKey"]=Key;
            _handlers[Key](req,se,res,j);
            return 0;
        }
        else
        {
            jsonfail_func(j,err_general,"No action is associated to key.");
            return -1;
        }
    }
    else
    {
        jsonfail_func(j,err_general,"Failed to find appropriate action to key.");
        return -1;
    }
}

#define REG_HANDLER(fn,key) _handlers.insert(make_pair(key,fn))

void InitHandlers()
{
    REG_HANDLER(UserLogin,1); /// 用户登录
    REG_HANDLER(UserLogout,2); /// 用户登出
    REG_HANDLER(CheckLogin,3); /// 检查是否已登录
    REG_HANDLER(CheckLoginX,4); /// 检查是否已登录(专用于登录页面,用于快速登录)
    REG_HANDLER(UserReaderAdd,5); /// 添加用户(同时添加读者信息)
    REG_HANDLER(UserReaderEdit,6); /// 修改用户(除管理员外)
    REG_HANDLER(UserReaderRemove,7); /// 删除用户(仅能删除读者账户)
    REG_HANDLER(UserSearch,8); /// 用户搜索
    REG_HANDLER(UserReaderGet,9); /// 账户读者信息获取
    //REG_HANDLER(UserReaderGetLow,10); /// 账户读者信息获取(低权限)

    REG_HANDLER(BookSearch,11); /// 图书搜索
    REG_HANDLER(BookGetInfo,12); /// 获取图书信息
    REG_HANDLER(BookGetObjInfo,13); /// 获取图书实体信息
    REG_HANDLER(BookGetBorrowed,14); /// 获取已借阅的书籍
    REG_HANDLER(BookObjAdd,15);
    REG_HANDLER(BookObjEdit,16);
    REG_HANDLER(BookObjRemove,17);

    REG_HANDLER(BookBorrow,21); /// 图书借阅
    REG_HANDLER(BookReturn,22); /// 图书归还

    REG_HANDLER(BookTypeGet,30); /// 查询已存在的图书种类
    REG_HANDLER(BookTypeAdd,31); /// 添加图书种类
    REG_HANDLER(BookTypeEdit,32); /// 修改图书种类
    REG_HANDLER(BookTypeRemove,33); /// 删除加图书种类

    REG_HANDLER(BookAdd,41); /// 添加图书信息
    REG_HANDLER(BookEdit,42); /// 修改图书信息
    REG_HANDLER(BookRemove,43); /// 删除图书信息
}

int main()
{
    InitHandlers();

    Request req;
    Session se(req);
    Response res;
    res.showOnDestroy(true);
    json j;

    default_jsonfail();

    do
    {
        /// Must be post
        if(req.requestMethod!="POST")
        {
            jsonfail(err_method_not_supported);
            break;
        }

        postval(action);

        int key_real=ParseInt(action);
        int ret;
        if((ret=RequestDispatch(req,se,res,j,key_real))>=0)
        {
            j["RD"]="success";
        }
        else
        {
            j["RD"]="fail";
        }
        j["RDCode"]=ret;

    }while(0);

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

    return 0;
}