/**
 *    Copyright (C) 2012 10gen Inc.
 *
 *    This program is free software: you can redistribute it and/or  modify
 *    it under the terms of the GNU Affero General Public License, version 3,
 *    as published by the Free Software Foundation.
 *
 *    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 Affero General Public License for more details.
 *
 *    You should have received a copy of the GNU Affero General Public License
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *    As a special exception, the copyright holders give permission to link the
 *    code of portions of this program with the OpenSSL library under certain
 *    conditions as described in each individual source file and distribute
 *    linked combinations including the program with the OpenSSL library. You
 *    must comply with the GNU Affero General Public License in all respects
 *    for all of the code used other than as permitted herein. If you modify
 *    file(s) with this exception, you may extend this exception to your
 *    version of the file(s), but you are not obligated to do so. If you do not
 *    wish to do so, delete this exception statement from your version. If you
 *    delete this exception statement from all source files in the program,
 *    then also delete it in the license file.
 */
#include "mongo/s/type_locks.h"

#include "mongo/db/field_parser.h"
#include "mongo/util/mongoutils/str.h"

namespace mongo {

using std::string;

using mongoutils::str::stream;

const std::string LocksType::ConfigNS = "config.locks";

const BSONField<std::string> LocksType::name("_id");
const BSONField<int> LocksType::state("state");
const BSONField<std::string> LocksType::process("process");
const BSONField<OID> LocksType::lockID("ts");
const BSONField<std::string> LocksType::who("who");
const BSONField<std::string> LocksType::why("why");
const BSONField<Date_t> LocksType::when("when");

LocksType::LocksType() {
    clear();
}

LocksType::~LocksType() {}

bool LocksType::isValid(std::string* errMsg) const {
    std::string dummy;
    if (errMsg == NULL) {
        errMsg = &dummy;
    }

    // All the mandatory fields must be present.
    if (!_isNameSet) {
        *errMsg = stream() << "missing " << name.name() << " field";
        return false;
    }
    if (!_isStateSet) {
        *errMsg = stream() << "missing " << state.name() << " field";
        return false;
    }

    // If the lock is locked check the remaining fields
    if (_state != UNLOCKED) {
        if (!_isProcessSet) {
            *errMsg = stream() << "missing " << process.name() << " field";
            return false;
        }

        if (!_isLockIDSet) {
            *errMsg = stream() << "missing " << lockID.name() << " field";
            return false;
        }

        if (!_isWhoSet) {
            *errMsg = stream() << "missing " << who.name() << " field";
            return false;
        }

        if (!_isWhySet) {
            *errMsg = stream() << "missing " << why.name() << " field";
            return false;
        }
    }

    return true;
}

BSONObj LocksType::toBSON() const {
    BSONObjBuilder builder;

    if (_isNameSet)
        builder.append(name(), _name);
    if (_isStateSet)
        builder.append(state(), _state);
    if (_isProcessSet)
        builder.append(process(), _process);
    if (_isLockIDSet)
        builder.append(lockID(), _lockID);
    if (_isWhoSet)
        builder.append(who(), _who);
    if (_isWhySet)
        builder.append(why(), _why);

    return builder.obj();
}

bool LocksType::parseBSON(const BSONObj& source, string* errMsg) {
    clear();

    std::string dummy;
    if (!errMsg)
        errMsg = &dummy;

    FieldParser::FieldState fieldState;
    fieldState = FieldParser::extract(source, name, &_name, errMsg);
    if (fieldState == FieldParser::FIELD_INVALID)
        return false;
    _isNameSet = fieldState == FieldParser::FIELD_SET;

    fieldState = FieldParser::extract(source, state, &_state, errMsg);
    if (fieldState == FieldParser::FIELD_INVALID)
        return false;
    _isStateSet = fieldState == FieldParser::FIELD_SET;

    fieldState = FieldParser::extract(source, process, &_process, errMsg);
    if (fieldState == FieldParser::FIELD_INVALID)
        return false;
    _isProcessSet = fieldState == FieldParser::FIELD_SET;

    fieldState = FieldParser::extract(source, lockID, &_lockID, errMsg);
    if (fieldState == FieldParser::FIELD_INVALID)
        return false;
    _isLockIDSet = fieldState == FieldParser::FIELD_SET;

    fieldState = FieldParser::extract(source, who, &_who, errMsg);
    if (fieldState == FieldParser::FIELD_INVALID)
        return false;
    _isWhoSet = fieldState == FieldParser::FIELD_SET;

    fieldState = FieldParser::extract(source, why, &_why, errMsg);
    if (fieldState == FieldParser::FIELD_INVALID)
        return false;
    _isWhySet = fieldState == FieldParser::FIELD_SET;

    return true;
}

void LocksType::clear() {
    _name.clear();
    _isNameSet = false;

    _state = UNLOCKED;
    _isStateSet = false;

    _process.clear();
    _isProcessSet = false;

    _lockID = OID();
    _isLockIDSet = false;

    _who.clear();
    _isWhoSet = false;

    _why.clear();
    _isWhySet = false;
}

void LocksType::cloneTo(LocksType* other) const {
    other->clear();

    other->_name = _name;
    other->_isNameSet = _isNameSet;

    other->_state = _state;
    other->_isStateSet = _isStateSet;

    other->_process = _process;
    other->_isProcessSet = _isProcessSet;

    other->_lockID = _lockID;
    other->_isLockIDSet = _isLockIDSet;

    other->_who = _who;
    other->_isWhoSet = _isWhoSet;

    other->_why = _why;
    other->_isWhySet = _isWhySet;
}

std::string LocksType::toString() const {
    return toBSON().toString();
}

}  // namespace mongo