/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "DefaultMQPullConsumer.h"
#include "CMessageExt.h"
#include "CPullConsumer.h"
#include "CCommon.h"

using namespace rocketmq;
using namespace std;

#ifdef __cplusplus
extern "C" {
#endif


CPullConsumer *CreatePullConsumer(const char *groupId) {
    if (groupId == NULL) {
        return NULL;
    }
    DefaultMQPullConsumer *defaultMQPullConsumer = new DefaultMQPullConsumer(groupId);
    return (CPullConsumer *) defaultMQPullConsumer;
}
int DestroyPullConsumer(CPullConsumer *consumer) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    delete reinterpret_cast<DefaultMQPullConsumer * >(consumer);
    return OK;
}
int StartPullConsumer(CPullConsumer *consumer) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    try {
        ((DefaultMQPullConsumer *) consumer)->start();
    } catch (exception &e) {
        return PULLCONSUMER_START_FAILED;
    }
    return OK;
}
int ShutdownPullConsumer(CPullConsumer *consumer) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    ((DefaultMQPullConsumer *) consumer)->shutdown();
    return OK;
}
int SetPullConsumerGroupID(CPullConsumer *consumer, const char *groupId) {
    if (consumer == NULL || groupId == NULL) {
        return NULL_POINTER;
    }
    ((DefaultMQPullConsumer *) consumer)->setGroupName(groupId);
    return OK;
}
const char *GetPullConsumerGroupID(CPullConsumer *consumer) {
    if (consumer == NULL) {
        return NULL;
    }
    return ((DefaultMQPullConsumer *) consumer)->getGroupName().c_str();
}
int SetPullConsumerNameServerAddress(CPullConsumer *consumer, const char *namesrv) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    ((DefaultMQPullConsumer *) consumer)->setNamesrvAddr(namesrv);
    return OK;
}
int SetPullConsumerNameServerDomain(CPullConsumer *consumer, const char *domain) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    ((DefaultMQPullConsumer *) consumer)->setNamesrvDomain(domain);
    return OK;
}
int SetPullConsumerSessionCredentials(CPullConsumer *consumer, const char *accessKey, const char *secretKey,
                                      const char *channel) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    ((DefaultMQPullConsumer *) consumer)->setSessionCredentials(accessKey, secretKey, channel);
    return OK;
}

int SetPullConsumerLogPath(CPullConsumer *consumer, const char *logPath) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    //Todo, This api should be implemented by core api.
    //((DefaultMQPullConsumer *) consumer)->setInstanceName(instanceName);
    return OK;
}

int SetPullConsumerLogFileNumAndSize(CPullConsumer *consumer, int fileNum, long fileSize) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    ((DefaultMQPullConsumer *) consumer)->setLogFileSizeAndNum(fileNum, fileSize);
    return OK;
}

int SetPullConsumerLogLevel(CPullConsumer *consumer, CLogLevel level) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    ((DefaultMQPullConsumer *) consumer)->setLogLevel((elogLevel) level);
    return OK;
}

int FetchSubscriptionMessageQueues(CPullConsumer *consumer, const char *topic, CMessageQueue **mqs, int *size) {
    if (consumer == NULL) {
        return NULL_POINTER;
    }
    unsigned int index = 0;
    CMessageQueue *temMQ = NULL;
    std::vector<MQMessageQueue> fullMQ;
    try {
        ((DefaultMQPullConsumer *) consumer)->fetchSubscribeMessageQueues(topic, fullMQ);
        *size = fullMQ.size();
        //Alloc memory to save the pointer to CPP MessageQueue, and the MessageQueues may be changed.
        //Thus, this memory should be released by users using @ReleaseSubscribeMessageQueue every time.
        temMQ = (CMessageQueue *) malloc(*size * sizeof(CMessageQueue));
        if (temMQ == NULL) {
            *size = 0;
            *mqs = NULL;
            return MALLOC_FAILED;
        }
        auto iter = fullMQ.begin();
        for (index = 0; iter != fullMQ.end() && index <= fullMQ.size(); ++iter, index++) {
            strncpy(temMQ[index].topic, iter->getTopic().c_str(), MAX_TOPIC_LENGTH - 1);
            strncpy(temMQ[index].brokerName, iter->getBrokerName().c_str(), MAX_BROKER_NAME_ID_LENGTH - 1);
            temMQ[index].queueId = iter->getQueueId();
        }
        *mqs = temMQ;
    } catch (MQException &e) {
        *size = 0;
        *mqs = NULL;
        return PULLCONSUMER_FETCH_MQ_FAILED;
    }
    return OK;
}
int ReleaseSubscriptionMessageQueue(CMessageQueue *mqs) {
    if (mqs == NULL) {
        return NULL_POINTER;
    }
    free((void *) mqs);
    mqs = NULL;
    return OK;
}
CPullResult
Pull(CPullConsumer *consumer, const CMessageQueue *mq, const char *subExpression, long long offset, int maxNums) {
    CPullResult pullResult;
    memset(&pullResult, 0, sizeof(CPullResult));
    MQMessageQueue messageQueue(mq->topic, mq->brokerName, mq->queueId);
    PullResult cppPullResult;
    try {
        cppPullResult = ((DefaultMQPullConsumer *) consumer)->pull(messageQueue, subExpression, offset, maxNums);
    } catch (exception &e) {
        cppPullResult.pullStatus = BROKER_TIMEOUT;
    }

    switch (cppPullResult.pullStatus) {
        case FOUND: {
            pullResult.pullStatus = E_FOUND;
            pullResult.maxOffset = cppPullResult.maxOffset;
            pullResult.minOffset = cppPullResult.minOffset;
            pullResult.nextBeginOffset = cppPullResult.nextBeginOffset;
            pullResult.size = cppPullResult.msgFoundList.size();
            PullResult *tmpPullResult = new PullResult(cppPullResult);
            pullResult.pData = tmpPullResult;
            //Alloc memory to save the pointer to CPP MQMessageExt, which will be release by the CPP SDK core.
            //Thus, this memory should be released by users using @ReleasePullResult
            pullResult.msgFoundList = (CMessageExt **) malloc(pullResult.size * sizeof(CMessageExt *));
            for (size_t i = 0; i < cppPullResult.msgFoundList.size(); i++) {
                MQMessageExt *msg = const_cast<MQMessageExt *>(&tmpPullResult->msgFoundList[i]);
                pullResult.msgFoundList[i] = (CMessageExt *) (msg);
            }
            break;
        }
        case NO_NEW_MSG: {
            pullResult.pullStatus = E_NO_NEW_MSG;
            break;
        }
        case NO_MATCHED_MSG: {
            pullResult.pullStatus = E_NO_MATCHED_MSG;
            break;
        }
        case OFFSET_ILLEGAL: {
            pullResult.pullStatus = E_OFFSET_ILLEGAL;
            break;
        }
        case BROKER_TIMEOUT: {
            pullResult.pullStatus = E_BROKER_TIMEOUT;
            break;
        }
        default:
            pullResult.pullStatus = E_NO_NEW_MSG;
            break;

    }
    return pullResult;
}
int ReleasePullResult(CPullResult pullResult) {
    if (pullResult.size == 0 || pullResult.msgFoundList == NULL || pullResult.pData == NULL) {
        return NULL_POINTER;
    }
    if (pullResult.pData != NULL) {
        try {
            delete ((PullResult *) pullResult.pData);
        } catch (exception &e) {
            return NULL_POINTER;
        }
    }
    free((void *) pullResult.msgFoundList);
    pullResult.msgFoundList = NULL;
    return OK;
}

#ifdef __cplusplus
};
#endif