/**
 * MaNGOS is a full featured server for World of Warcraft, supporting
 * the following clients: 1.12.x, 2.4.3, 3.3.5a, 4.3.4a and 5.4.8
 *
 * Copyright (C) 2005-2018  MaNGOS project <https://getmangos.eu>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * World of Warcraft, and all World of Warcraft or Warcraft art, images,
 * and lore are copyrighted by Blizzard Entertainment, Inc.
 */

#include "AccountMgr.h"
#include "Database/DatabaseEnv.h"
#include "ObjectAccessor.h"
#include "ObjectGuid.h"
#include "Player.h"
#include "Policies/Singleton.h"
#include "Util.h"
#include "Auth/Sha1.h"

extern DatabaseType LoginDatabase;

INSTANTIATE_SINGLETON_1(AccountMgr);

AccountMgr::AccountMgr()
{}

AccountMgr::~AccountMgr()
{}

AccountOpResult AccountMgr::CreateAccount(std::string username, std::string password)
{
    if (utf8length(username) > MAX_ACCOUNT_STR)
        { return AOR_NAME_TOO_LONG; }                           // username's too long

    normalizeString(username);
    normalizeString(password);

    if (GetId(username))
    {
        { return AOR_NAME_ALREADY_EXIST; }                       // username does already exist
    }

    if (!LoginDatabase.PExecute("INSERT INTO account(username,sha_pass_hash,joindate) VALUES('%s','%s',NOW())", username.c_str(), CalculateShaPassHash(username, password).c_str()))
        { return AOR_DB_INTERNAL_ERROR; }                       // unexpected error
    LoginDatabase.Execute("INSERT INTO realmcharacters (realmid, acctid, numchars) SELECT realmlist.id, account.id, 0 FROM realmlist,account LEFT JOIN realmcharacters ON acctid=account.id WHERE acctid IS NULL");

    return AOR_OK;                                          // everything's fine
}

AccountOpResult AccountMgr::DeleteAccount(uint32 accid)
{
    QueryResult* result = LoginDatabase.PQuery("SELECT 1 FROM account WHERE id='%u'", accid);
    if (!result)
        { return AOR_NAME_NOT_EXIST; }                          // account doesn't exist
    delete result;

    // existing characters list
    result = CharacterDatabase.PQuery("SELECT guid FROM characters WHERE account='%u'", accid);
    if (result)
    {
        do
        {
            Field* fields = result->Fetch();
            uint32 guidlo = fields[0].GetUInt32();
            ObjectGuid guid = ObjectGuid(HIGHGUID_PLAYER, guidlo);

            // kick if player currently
            ObjectAccessor::KickPlayer(guid);
            Player::DeleteFromDB(guid, accid, false);       // no need to update realm characters
        }
        while (result->NextRow());

        delete result;
    }

    // table realm specific but common for all characters of account for realm
    CharacterDatabase.PExecute("DELETE FROM character_tutorial WHERE account = '%u'", accid);

    LoginDatabase.BeginTransaction();

    bool res =
        LoginDatabase.PExecute("DELETE FROM account WHERE id='%u'", accid) &&
        LoginDatabase.PExecute("DELETE FROM realmcharacters WHERE acctid='%u'", accid);

    LoginDatabase.CommitTransaction();

    if (!res)
        { return AOR_DB_INTERNAL_ERROR; }                       // unexpected error;

    return AOR_OK;
}

AccountOpResult AccountMgr::ChangeUsername(uint32 accid, std::string new_uname, std::string new_passwd)
{
    QueryResult* result = LoginDatabase.PQuery("SELECT 1 FROM account WHERE id='%u'", accid);
    if (!result)
        { return AOR_NAME_NOT_EXIST; }                          // account doesn't exist
    delete result;

    if (utf8length(new_uname) > MAX_ACCOUNT_STR)
        { return AOR_NAME_TOO_LONG; }

    if (utf8length(new_passwd) > MAX_ACCOUNT_STR)
        { return AOR_PASS_TOO_LONG; }

    normalizeString(new_uname);
    normalizeString(new_passwd);

    std::string safe_new_uname = new_uname;
    LoginDatabase.escape_string(safe_new_uname);

    if (!LoginDatabase.PExecute("UPDATE account SET v='0',s='0',username='%s',sha_pass_hash='%s' WHERE id='%u'", safe_new_uname.c_str(),
                                CalculateShaPassHash(new_uname, new_passwd).c_str(), accid))
        { return AOR_DB_INTERNAL_ERROR; }                       // unexpected error

    return AOR_OK;
}

AccountOpResult AccountMgr::ChangePassword(uint32 accid, std::string new_passwd)
{
    std::string username;

    if (!GetName(accid, username))
        { return AOR_NAME_NOT_EXIST; }                          // account doesn't exist

    if (utf8length(new_passwd) > MAX_ACCOUNT_STR)
        { return AOR_PASS_TOO_LONG; }

    normalizeString(username);
    normalizeString(new_passwd);

    // also reset s and v to force update at next realmd login
    if (!LoginDatabase.PExecute("UPDATE account SET v='0', s='0', sha_pass_hash='%s' WHERE id='%u'",
                                CalculateShaPassHash(username, new_passwd).c_str(), accid))
        { return AOR_DB_INTERNAL_ERROR; }                       // unexpected error

    return AOR_OK;
}

uint32 AccountMgr::GetId(std::string username)
{
    LoginDatabase.escape_string(username);
    QueryResult* result = LoginDatabase.PQuery("SELECT id FROM account WHERE username = '%s'", username.c_str());
    if (!result)
        { return 0; }
    else
    {
        uint32 id = (*result)[0].GetUInt32();
        delete result;
        return id;
    }
}

AccountTypes AccountMgr::GetSecurity(uint32 acc_id)
{
    QueryResult* result = LoginDatabase.PQuery("SELECT gmlevel FROM account WHERE id = '%u'", acc_id);
    if (result)
    {
        AccountTypes sec = AccountTypes((*result)[0].GetInt32());
        delete result;
        return sec;
    }

    return SEC_PLAYER;
}

bool AccountMgr::GetName(uint32 acc_id, std::string& name)
{
    QueryResult* result = LoginDatabase.PQuery("SELECT username FROM account WHERE id = '%u'", acc_id);
    if (result)
    {
        name = (*result)[0].GetCppString();
        delete result;
        return true;
    }

    return false;
}

uint32 AccountMgr::GetCharactersCount(uint32 acc_id)
{
    // check character count
    QueryResult* result = CharacterDatabase.PQuery("SELECT COUNT(guid) FROM characters WHERE account = '%u'", acc_id);
    if (result)
    {
        Field* fields = result->Fetch();
        uint32 charcount = fields[0].GetUInt32();
        delete result;
        return charcount;
    }
    else
        { return 0; }
}

bool AccountMgr::CheckPassword(uint32 accid, std::string passwd)
{
    std::string username;
    if (!GetName(accid, username))
        { return false; }

    normalizeString(passwd);
    normalizeString(username);

    QueryResult* result = LoginDatabase.PQuery("SELECT 1 FROM account WHERE id='%u' AND sha_pass_hash='%s'", accid, CalculateShaPassHash(username, passwd).c_str());
    if (result)
    {
        delete result;
        return true;
    }

    return false;
}

bool AccountMgr::normalizeString(std::string& utf8str)
{
    wchar_t wstr_buf[MAX_ACCOUNT_STR + 1];
    size_t wstr_len = MAX_ACCOUNT_STR;

    if (!Utf8toWStr(utf8str, wstr_buf, wstr_len))
        { return false; }

    for (uint32 i = 0; i <= wstr_len; ++i)
        wstr_buf[i] = wcharToUpperOnlyLatin(wstr_buf[i]);

    return WStrToUtf8(wstr_buf, wstr_len, utf8str);
}

std::string AccountMgr::CalculateShaPassHash(std::string& name, std::string& password)
{
    Sha1Hash sha;
    sha.Initialize();
    sha.UpdateData(name);
    sha.UpdateData(":");
    sha.UpdateData(password);
    sha.Finalize();

    std::string encoded;
    hexEncodeByteArray(sha.GetDigest(), sha.GetLength(), encoded);

    return encoded;
}