/*
 * Copyright (C) 2008-2011 TrinityCore <http://www.trinitycore.org/>
 *
 * 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 "PreparedStatement.h"
#include "MySQLConnection.h"
#include "Log.h"

PreparedStatement::PreparedStatement(uint32 index) :
m_stmt(NULL),
m_index(index)
{
}

PreparedStatement::~PreparedStatement()
{
}

void PreparedStatement::BindParameters()
{
    ASSERT (m_stmt);

    uint32 i = 0;
    for (; i < statement_data.size(); i++)
    {
        switch (statement_data[i].type)
        {
            case TYPE_BOOL:
                m_stmt->setBool(i, statement_data[i].data.boolean);
                break;
            case TYPE_UI8:
            case TYPE_UI16:
            case TYPE_UI32:
                m_stmt->setUInt32(i, statement_data[i].data.ui32);
                break;
            case TYPE_I8:
            case TYPE_I16:
            case TYPE_I32:
                m_stmt->setInt32(i, statement_data[i].data.i32);
                break;
            case TYPE_UI64:
                m_stmt->setUInt64(i, statement_data[i].data.ui64);
                break;
            case TYPE_I64:
                m_stmt->setInt64(i, statement_data[i].data.i64);
                break;
            case TYPE_FLOAT:
                m_stmt->setFloat(i, statement_data[i].data.f);
                break;
            case TYPE_DOUBLE:
                m_stmt->setDouble(i, statement_data[i].data.d);
                break;
            case TYPE_STRING:
                m_stmt->setString(i, statement_data[i].str.c_str());
                break;
        }
    }
    #ifdef _DEBUG
    if (i < m_stmt->m_paramCount)
        sLog->outSQLDriver("[WARNING]: BindParameters() for statement %u did not bind all allocated parameters", m_index);
    #endif
}

//- Bind to buffer
void PreparedStatement::setBool(const uint8 index, const bool value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.boolean = value;
    statement_data[index].type = TYPE_BOOL;
}

void PreparedStatement::setUInt8(const uint8 index, const uint8 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.ui32 = value;
    statement_data[index].type = TYPE_UI8;
}

void PreparedStatement::setUInt16(const uint8 index, const uint16 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.ui32 = value;
    statement_data[index].type = TYPE_UI16;
}

void PreparedStatement::setUInt32(const uint8 index, const uint32 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.ui32 = value;
    statement_data[index].type = TYPE_UI32;
}

void PreparedStatement::setUInt64(const uint8 index, const uint64 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.ui64 = value;
    statement_data[index].type = TYPE_UI64;
}

void PreparedStatement::setInt8(const uint8 index, const int8 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.i32 = value;
    statement_data[index].type = TYPE_I8;
}

void PreparedStatement::setInt16(const uint8 index, const int16 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.i32 = value;
    statement_data[index].type = TYPE_I16;
}

void PreparedStatement::setInt32(const uint8 index, const int32 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.i32 = value;
    statement_data[index].type = TYPE_I32;
}

void PreparedStatement::setInt64(const uint8 index, const int64 value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.i64 = value;
    statement_data[index].type = TYPE_I64;
}

void PreparedStatement::setFloat(const uint8 index, const float value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.f = value;
    statement_data[index].type = TYPE_FLOAT;
}

void PreparedStatement::setDouble(const uint8 index, const double value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].data.d = value;
    statement_data[index].type = TYPE_DOUBLE;
}

void PreparedStatement::setString(const uint8 index, const std::string& value)
{
    if (index >= statement_data.size())
        statement_data.resize(index+1);

    statement_data[index].str = value;
    statement_data[index].type = TYPE_STRING;
}

MySQLPreparedStatement::MySQLPreparedStatement(MYSQL_STMT* stmt) :
m_Mstmt(stmt),
m_bind(NULL)
{
    /// Initialize variable parameters
    m_paramCount = mysql_stmt_param_count(stmt);
    m_paramsSet.assign(m_paramCount, false);
    m_bind = new MYSQL_BIND[m_paramCount];
    memset(m_bind, 0, sizeof(MYSQL_BIND)*m_paramCount);

    /// "If set to 1, causes mysql_stmt_store_result() to update the metadata MYSQL_FIELD->max_length value."
    my_bool bool_tmp = 1;
    mysql_stmt_attr_set(stmt, STMT_ATTR_UPDATE_MAX_LENGTH, &bool_tmp);
}

MySQLPreparedStatement::~MySQLPreparedStatement()
{
    ClearParameters();
    mysql_stmt_close(m_Mstmt);
    delete[] m_bind;
}

void MySQLPreparedStatement::ClearParameters()
{
    for (uint32 i=0; i < m_paramCount; ++i)
    {
        delete m_bind[i].length;
        m_bind[i].length = NULL;
        delete[] (char*) m_bind[i].buffer;
        m_bind[i].buffer = NULL;
        m_paramsSet[i] = false;
    }
}

//- Bind on mysql level
bool MySQLPreparedStatement::CheckValidIndex(uint8 index)
{
    if (index >= m_paramCount)
        return false;

    if (m_paramsSet[index])
        sLog->outSQLDriver("[WARNING] Prepared Statement (id: %u) trying to bind value on already bound index (%u).", m_stmt->m_index, index);
    return true;
}

void MySQLPreparedStatement::setBool(const uint8 index, const bool value)
{
    setUInt32(index, value);
}

void MySQLPreparedStatement::setUInt8(const uint8 index, const uint8 value)
{
    setUInt32(index, value);
}

void MySQLPreparedStatement::setUInt16(const uint8 index, const uint16 value)
{
    setUInt32(index, value);
}

void MySQLPreparedStatement::setUInt32(const uint8 index, const uint32 value)
{
    CheckValidIndex(index);
    m_paramsSet[index] = true;
    MYSQL_BIND* param = &m_bind[index];
    setValue(param, MYSQL_TYPE_LONG, &value, sizeof(uint32), true);
}

void MySQLPreparedStatement::setUInt64(const uint8 index, const uint64 value)
{
    CheckValidIndex(index);
    m_paramsSet[index] = true;
    MYSQL_BIND* param = &m_bind[index];
    setValue(param, MYSQL_TYPE_LONGLONG, &value, sizeof(uint64), true);
}

void MySQLPreparedStatement::setInt8(const uint8 index, const int8 value)
{
    setInt32(index, value);
}

void MySQLPreparedStatement::setInt16(const uint8 index, const int16 value)
{
    setInt32(index, value);
}

void MySQLPreparedStatement::setInt32(const uint8 index, const int32 value)
{
    CheckValidIndex(index);
    m_paramsSet[index] = true;
    MYSQL_BIND* param = &m_bind[index];
    setValue(param, MYSQL_TYPE_LONG, &value, sizeof(int32), false);
}

void MySQLPreparedStatement::setInt64(const uint8 index, const int64 value)
{
    CheckValidIndex(index);
    m_paramsSet[index] = true;
    MYSQL_BIND* param = &m_bind[index];
    setValue(param, MYSQL_TYPE_LONGLONG, &value, sizeof(int64), false);
}

void MySQLPreparedStatement::setFloat(const uint8 index, const float value)
{
    CheckValidIndex(index);
    m_paramsSet[index] = true;
    MYSQL_BIND* param = &m_bind[index];
    setValue(param, MYSQL_TYPE_FLOAT, &value, sizeof(float), (value > 0.0f));
}

void MySQLPreparedStatement::setDouble(const uint8 index, const double value)
{
    CheckValidIndex(index);
    m_paramsSet[index] = true;
    MYSQL_BIND* param = &m_bind[index];
    setValue(param, MYSQL_TYPE_DOUBLE, &value, sizeof(double), (value > 0.0f));
}

void MySQLPreparedStatement::setString(const uint8 index, const char* value)
{
    CheckValidIndex(index);
    m_paramsSet[index] = true;
    MYSQL_BIND* param = &m_bind[index];
    size_t len = strlen(value) + 1;
    param->buffer_type = MYSQL_TYPE_VAR_STRING;
    delete [] static_cast<char *>(param->buffer);
    param->buffer = new char[len];
    param->buffer_length = len;
    param->is_null_value = 0;
    param->length = new unsigned long(len-1);

    memcpy(param->buffer, value, len);
}

void MySQLPreparedStatement::setValue(MYSQL_BIND* param, enum_field_types type, const void* value, uint32 len, bool isUnsigned)
{
    param->buffer_type = type;
    delete [] static_cast<char *>(param->buffer);
    param->buffer = new char[len];
    param->buffer_length = 0;
    param->is_null_value = 0;
    param->length = NULL;               // Only != NULL for strings
    param->is_unsigned = isUnsigned;

    memcpy(param->buffer, value, len);
}

std::string MySQLPreparedStatement::getQueryString(const char *query)
{
    std::string queryString = query;

    uint32 pos = 0;
    for (uint32 i = 0; i < m_stmt->statement_data.size(); i++)
    {
        pos = queryString.find("?", pos);
        std::stringstream replace;

        replace << "'";

        switch (m_stmt->statement_data[i].type)
        {
        case TYPE_BOOL:
            replace << m_stmt->statement_data[i].data.boolean ? "1" : "0";
            break;
        case TYPE_UI8:
        case TYPE_UI16:
        case TYPE_UI32:
            replace << m_stmt->statement_data[i].data.ui32;
            break;
        case TYPE_I8:
        case TYPE_I16:
        case TYPE_I32:
            replace << m_stmt->statement_data[i].data.i32;
            break;
        case TYPE_UI64:
            replace << m_stmt->statement_data[i].data.ui64;
            break;
        case TYPE_I64:
            replace << m_stmt->statement_data[i].data.i64;
            break;
        case TYPE_FLOAT:
            replace << m_stmt->statement_data[i].data.f;
            break;
        case TYPE_DOUBLE:
            replace << m_stmt->statement_data[i].data.d;
            break;
        case TYPE_STRING:
            replace << m_stmt->statement_data[i].str;
            break;
        }
        replace << "'";
        queryString.replace(pos, 1, replace.str());
    }

    return queryString;
}

//- Execution
PreparedStatementTask::PreparedStatementTask(PreparedStatement* stmt) :
m_stmt(stmt),
m_has_result(false)
{
}

PreparedStatementTask::PreparedStatementTask(PreparedStatement* stmt, PreparedQueryResultFuture result) :
m_stmt(stmt),
m_has_result(true),
m_result(result)
{
}


PreparedStatementTask::~PreparedStatementTask()
{
    delete m_stmt;
}

bool PreparedStatementTask::Execute()
{
    if (m_has_result)
    {
        PreparedResultSet* result = m_conn->Query(m_stmt);
        if (!result || !result->GetRowCount())
        {
            m_result.set(PreparedQueryResult(NULL));
            return false;
        }
        m_result.set(PreparedQueryResult(result));
        return true;
    }

    return m_conn->Execute(m_stmt);
}