#pragma once
#include "mysql.hpp"
#include "relation.hxx"
#include "relation-odb.hxx"

namespace bite_im {
    class RelationTable {
        public:
            using ptr = std::shared_ptr<RelationTable>;
            RelationTable(const std::shared_ptr<odb::core::database> &db) : _db(db){}
            //新增关系信息
            bool insert(const std::string &uid, const std::string &pid) {
                //{1,2} {2,1}
                try {
                    Relation r1(uid, pid);
                    Relation r2(pid, uid);
                    odb::transaction trans(_db->begin());
                    _db->persist(r1);
                    _db->persist(r2);
                    trans.commit();
                }catch (std::exception &e) {
                    LOG_ERROR("新增用户好友关系信息失败 {}-{}:{}！", uid, pid, e.what());
                    return false;
                }
                return true;
            }
            //移除关系信息
            bool remove(const std::string &uid, const std::string &pid) {
                try {
                    odb::transaction trans(_db->begin());
                    typedef odb::query<Relation> query;
                    typedef odb::result<Relation> result;
                    _db->erase_query<Relation>(query::user_id == uid && query::peer_id == pid);
                    _db->erase_query<Relation>(query::user_id == pid && query::peer_id == uid);
                    trans.commit();
                }catch (std::exception &e) {
                    LOG_ERROR("删除好友关系信息失败 {}-{}:{}！", uid, pid, e.what());
                    return false;
                }
                return true;
            }
            //判断关系是否存在
            bool exists(const std::string &uid, const std::string &pid) {
                typedef odb::query<Relation> query;
                typedef odb::result<Relation> result;
                result r;
                bool flag = false;
                try {
                    odb::transaction trans(_db->begin());
                    r = _db->query<Relation>(query::user_id == uid && query::peer_id == pid);
                    flag = !r.empty();
                    trans.commit();
                }catch (std::exception &e) {
                    LOG_ERROR("获取用户好友关系失败:{}-{}-{}！", uid, pid, e.what());
                }
                return flag;
            }
            //获取指定用户的好友ID
            std::vector<std::string> friends(const std::string &uid) {
                std::vector<std::string> res;
                try {
                    odb::transaction trans(_db->begin());
                    typedef odb::query<Relation> query;
                    typedef odb::result<Relation> result;
                    result r(_db->query<Relation>(query::user_id == uid));
                    for (result::iterator i(r.begin()); i != r.end(); ++i) {
                        res.push_back(i->peer_id());
                    }
                    trans.commit();
                }catch (std::exception &e) {
                    LOG_ERROR("通过用户-{}的所有好友ID失败:{}！", uid, e.what());
                }
                return res;
            }
        private:
            std::shared_ptr<odb::core::database> _db;
    };
}