/*
 * Copyright (C) 2008-2013 TrinityCore <http://www.trinitycore.org/>
 * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */

#include "AccountMgr.h"
#include "DatabaseEnv.h"
#include "ObjectAccessor.h"
#include "Player.h"
#include "Util.h"
#include "SHA1.h"
#include "WorldSession.h"

namespace AccountMgr
{

AccountOpResult 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_ALREDY_EXIST;                       // username does already exist

    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_INS_ACCOUNT);

    stmt->setString(0, username);
    stmt->setString(1, CalculateShaPassHash(username, password));

    LoginDatabase.Execute(stmt);

    stmt = LoginDatabase.GetPreparedStatement(LOGIN_INS_REALM_CHARACTERS_INIT);

    LoginDatabase.Execute(stmt);

    return AOR_OK;                                          // everything's fine
}

AccountOpResult DeleteAccount(uint32 accountId)
{
    // Check if accounts exists
    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_SEL_ACCOUNT_BY_ID);
    stmt->setUInt32(0, accountId);
    PreparedQueryResult result = LoginDatabase.Query(stmt);

    if (!result)
        return AOR_NAME_NOT_EXIST;

    // Obtain accounts characters
    stmt = CharacterDatabase.GetPreparedStatement(CHAR_SEL_CHARS_BY_ACCOUNT_ID);

    stmt->setUInt32(0, accountId);

    result = CharacterDatabase.Query(stmt);

    if (result)
    {
        do
        {
            uint32 guidLow = (*result)[0].GetUInt32();
            uint64 guid = MAKE_NEW_GUID(guidLow, 0, HIGHGUID_PLAYER);

            // Kick if player is online
            if (Player* p = ObjectAccessor::FindPlayer(guid))
            {
                WorldSession* s = p->GetSession();
                s->KickPlayer();                            // mark session to remove at next session list update
                s->LogoutPlayer(false);                     // logout player without waiting next session list update
            }

            Player::DeleteFromDB(guid, accountId, false);       // no need to update realm characters
        } while (result->NextRow());
    }

    // table realm specific but common for all characters of account for realm
    stmt = CharacterDatabase.GetPreparedStatement(CHAR_DEL_TUTORIALS);
    stmt->setUInt32(0, accountId);
    CharacterDatabase.Execute(stmt);

    stmt = CharacterDatabase.GetPreparedStatement(CHAR_DEL_ACCOUNT_DATA);
    stmt->setUInt32(0, accountId);
    CharacterDatabase.Execute(stmt);

    stmt = CharacterDatabase.GetPreparedStatement(CHAR_DEL_CHARACTER_BAN);
    stmt->setUInt32(0, accountId);
    CharacterDatabase.Execute(stmt);

    SQLTransaction trans = LoginDatabase.BeginTransaction();

    stmt = LoginDatabase.GetPreparedStatement(LOGIN_DEL_ACCOUNT);
    stmt->setUInt32(0, accountId);
    trans->Append(stmt);

    stmt = LoginDatabase.GetPreparedStatement(LOGIN_DEL_ACCOUNT_ACCESS);
    stmt->setUInt32(0, accountId);
    trans->Append(stmt);

    stmt = LoginDatabase.GetPreparedStatement(LOGIN_DEL_REALM_CHARACTERS);
    stmt->setUInt32(0, accountId);
    trans->Append(stmt);

    stmt = LoginDatabase.GetPreparedStatement(LOGIN_DEL_ACCOUNT_BANNED);
    stmt->setUInt32(0, accountId);
    trans->Append(stmt);

    LoginDatabase.CommitTransaction(trans);

    return AOR_OK;
}

AccountOpResult ChangeUsername(uint32 accountId, std::string newUsername, std::string newPassword)
{
    // Check if accounts exists
    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_SEL_ACCOUNT_BY_ID);
    stmt->setUInt32(0, accountId);
    PreparedQueryResult result = LoginDatabase.Query(stmt);

    if (!result)
        return AOR_NAME_NOT_EXIST;

    if (utf8length(newUsername) > MAX_ACCOUNT_STR)
        return AOR_NAME_TOO_LONG;

    if (utf8length(newPassword) > MAX_ACCOUNT_STR)
        return AOR_PASS_TOO_LONG;

    normalizeString(newUsername);
    normalizeString(newPassword);

    stmt = LoginDatabase.GetPreparedStatement(LOGIN_UPD_USERNAME);

    stmt->setString(0, newUsername);
    stmt->setString(1, CalculateShaPassHash(newUsername, newPassword));
    stmt->setUInt32(2, accountId);

    LoginDatabase.Execute(stmt);

    return AOR_OK;
}

AccountOpResult ChangePassword(uint32 accountId, std::string newPassword)
{
    std::string username;

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

    if (utf8length(newPassword) > MAX_ACCOUNT_STR)
        return AOR_PASS_TOO_LONG;

    normalizeString(username);
    normalizeString(newPassword);

    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_UPD_PASSWORD);

    stmt->setString(0, CalculateShaPassHash(username, newPassword));
    stmt->setUInt32(1, accountId);

    LoginDatabase.Execute(stmt);

    return AOR_OK;
}

uint32 GetId(std::string const& username)
{
    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_GET_ACCOUNT_ID_BY_USERNAME);
    stmt->setString(0, username);
    PreparedQueryResult result = LoginDatabase.Query(stmt);

    return (result) ? (*result)[0].GetUInt32() : 0;
}

uint32 GetSecurity(uint32 accountId)
{
    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_GET_ACCOUNT_ACCESS_GMLEVEL);
    stmt->setUInt32(0, accountId);
    PreparedQueryResult result = LoginDatabase.Query(stmt);

    return (result) ? (*result)[0].GetUInt8() : uint32(SEC_PLAYER);
}

uint32 GetSecurity(uint32 accountId, int32 realmId)
{
    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_GET_GMLEVEL_BY_REALMID);
    stmt->setUInt32(0, accountId);
    stmt->setInt32(1, realmId);
    PreparedQueryResult result = LoginDatabase.Query(stmt);

    return (result) ? (*result)[0].GetUInt8() : uint32(SEC_PLAYER);
}

bool GetName(uint32 accountId, std::string& name)
{
    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_GET_USERNAME_BY_ID);
    stmt->setUInt32(0, accountId);
    PreparedQueryResult result = LoginDatabase.Query(stmt);

    if (result)
    {
        name = (*result)[0].GetString();
        return true;
    }

    return false;
}

bool CheckPassword(uint32 accountId, std::string password)
{
    std::string username;

    if (!GetName(accountId, username))
        return false;

    normalizeString(username);
    normalizeString(password);

    PreparedStatement* stmt = LoginDatabase.GetPreparedStatement(LOGIN_SEL_CHECK_PASSWORD);
    stmt->setUInt32(0, accountId);
    stmt->setString(1, CalculateShaPassHash(username, password));
    PreparedQueryResult result = LoginDatabase.Query(stmt);

    return (result) ? true : false;
}

uint32 GetCharactersCount(uint32 accountId)
{
    // check character count
    PreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_SEL_SUM_CHARS);
    stmt->setUInt32(0, accountId);
    PreparedQueryResult result = CharacterDatabase.Query(stmt);

    return (result) ? (*result)[0].GetUInt64() : 0;
}

bool normalizeString(std::string& utf8String)
{
    wchar_t buffer[MAX_ACCOUNT_STR+1];

    size_t maxLength = MAX_ACCOUNT_STR;
    if (!Utf8toWStr(utf8String, buffer, maxLength))
        return false;
#ifdef _MSC_VER
#pragma warning(disable: 4996)
#endif
    std::transform(&buffer[0], buffer+maxLength, &buffer[0], wcharToUpperOnlyLatin);
#ifdef _MSC_VER
#pragma warning(default: 4996)
#endif

    return WStrToUtf8(buffer, maxLength, utf8String);
}

std::string CalculateShaPassHash(std::string const& name, std::string const& password)
{
    SHA1Hash sha;
    sha.Initialize();
    sha.UpdateData(name);
    sha.UpdateData(":");
    sha.UpdateData(password);
    sha.Finalize();

    return ByteArrayToHexStr(sha.GetDigest(), sha.GetLength());
}

bool IsPlayerAccount(uint32 gmlevel)
{
    return gmlevel == SEC_PLAYER;
}

bool IsModeratorAccount(uint32 gmlevel)
{
    return gmlevel >= SEC_MODERATOR && gmlevel <= SEC_CONSOLE;
}

bool IsGMAccount(uint32 gmlevel)
{
    return gmlevel >= SEC_GAMEMASTER && gmlevel <= SEC_CONSOLE;
}

bool IsAdminAccount(uint32 gmlevel)
{
    return gmlevel >= SEC_ADMINISTRATOR && gmlevel <= SEC_CONSOLE;
}

bool IsConsoleAccount(uint32 gmlevel)
{
    return gmlevel == SEC_CONSOLE;
}

} // Namespace AccountMgr