// 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 "SchedInst.h"
#include "server/Config.h"
#include "ResourceFactory.h"
#include "knowhere/index/vector_index/IndexGPUIVF.h"
#include "Utils.h"


namespace zilliz {
namespace milvus {
namespace engine {

ResourceMgrPtr ResMgrInst::instance = nullptr;
std::mutex ResMgrInst::mutex_;

SchedulerPtr SchedInst::instance = nullptr;
std::mutex SchedInst::mutex_;

scheduler::JobMgrPtr JobMgrInst::instance = nullptr;
std::mutex JobMgrInst::mutex_;

void
load_simple_config() {
    server::Config &config = server::Config::GetInstance();
    std::string mode;
    config.GetResourceConfigMode(mode);
    std::vector<std::string> pool;
    config.GetResourceConfigPool(pool);

    bool cpu = false;
    std::set<uint64_t> gpu_ids;
    for (auto &resource : pool) {
        if (resource == "cpu") {
            cpu = true;
            break;
        } else {
            if (resource.length() < 4 || resource.substr(0, 3) != "gpu") {
                // error
                exit(-1);
            }
            auto gpu_id = std::stoi(resource.substr(3));
            if (gpu_id >= get_num_gpu()) {
                // error
                exit(-1);
            }
            gpu_ids.insert(gpu_id);
        }
    }

    ResMgrInst::GetInstance()->Add(ResourceFactory::Create("disk", "DISK", 0, true, false));
    auto io = Connection("io", 500);
    if (cpu) {
        ResMgrInst::GetInstance()->Add(ResourceFactory::Create("cpu", "CPU", 0, true, true));
        ResMgrInst::GetInstance()->Connect("disk", "cpu", io);
    } else {
        ResMgrInst::GetInstance()->Add(ResourceFactory::Create("cpu", "CPU", 0, true, false));
        ResMgrInst::GetInstance()->Connect("disk", "cpu", io);

        auto pcie = Connection("pcie", 12000);
        for (auto &gpu_id : gpu_ids) {
            ResMgrInst::GetInstance()->Add(ResourceFactory::Create(std::to_string(gpu_id), "GPU", gpu_id, true, true));
            ResMgrInst::GetInstance()->Connect("cpu", std::to_string(gpu_id), io);
        }
    }
}

void
load_advance_config() {
//    try {
//        server::ConfigNode &config = server::Config::GetInstance().GetConfig(server::CONFIG_RESOURCE);
//
//        if (config.GetChildren().empty()) throw "resource_config null exception";
//
//        auto resources = config.GetChild(server::CONFIG_RESOURCES).GetChildren();
//
//        if (resources.empty()) throw "Children of resource_config null exception";
//
//        for (auto &resource : resources) {
//            auto &resname = resource.first;
//            auto &resconf = resource.second;
//            auto type = resconf.GetValue(server::CONFIG_RESOURCE_TYPE);
////        auto memory = resconf.GetInt64Value(server::CONFIG_RESOURCE_MEMORY);
//            auto device_id = resconf.GetInt64Value(server::CONFIG_RESOURCE_DEVICE_ID);
////            auto enable_loader = resconf.GetBoolValue(server::CONFIG_RESOURCE_ENABLE_LOADER);
//            auto enable_loader = true;
//            auto enable_executor = resconf.GetBoolValue(server::CONFIG_RESOURCE_ENABLE_EXECUTOR);
//            auto pinned_memory = resconf.GetInt64Value(server::CONFIG_RESOURCE_PIN_MEMORY);
//            auto temp_memory = resconf.GetInt64Value(server::CONFIG_RESOURCE_TEMP_MEMORY);
//            auto resource_num = resconf.GetInt64Value(server::CONFIG_RESOURCE_NUM);
//
//            auto res = ResMgrInst::GetInstance()->Add(ResourceFactory::Create(resname,
//                                                                              type,
//                                                                              device_id,
//                                                                              enable_loader,
//                                                                              enable_executor));
//
//            if (res.lock()->type() == ResourceType::GPU) {
//                auto pinned_memory = resconf.GetInt64Value(server::CONFIG_RESOURCE_PIN_MEMORY, 300);
//                auto temp_memory = resconf.GetInt64Value(server::CONFIG_RESOURCE_TEMP_MEMORY, 300);
//                auto resource_num = resconf.GetInt64Value(server::CONFIG_RESOURCE_NUM, 2);
//                pinned_memory = 1024 * 1024 * pinned_memory;
//                temp_memory = 1024 * 1024 * temp_memory;
//                knowhere::FaissGpuResourceMgr::GetInstance().InitDevice(device_id,
//                                                                        pinned_memory,
//                                                                        temp_memory,
//                                                                        resource_num);
//            }
//        }
//
//        knowhere::FaissGpuResourceMgr::GetInstance().InitResource();
//
//        auto connections = config.GetChild(server::CONFIG_RESOURCE_CONNECTIONS).GetChildren();
//        if (connections.empty()) throw "connections config null exception";
//        for (auto &conn : connections) {
//            auto &connect_name = conn.first;
//            auto &connect_conf = conn.second;
//            auto connect_speed = connect_conf.GetInt64Value(server::CONFIG_SPEED_CONNECTIONS);
//            auto connect_endpoint = connect_conf.GetValue(server::CONFIG_ENDPOINT_CONNECTIONS);
//
//            std::string delimiter = "===";
//            std::string left = connect_endpoint.substr(0, connect_endpoint.find(delimiter));
//            std::string right = connect_endpoint.substr(connect_endpoint.find(delimiter) + 3,
//                                                        connect_endpoint.length());
//
//            auto connection = Connection(connect_name, connect_speed);
//            ResMgrInst::GetInstance()->Connect(left, right, connection);
//        }
//    } catch (const char *msg) {
//        SERVER_LOG_ERROR << msg;
//        // TODO: throw exception instead
//        exit(-1);
////        throw std::exception();
//    }
}

void
StartSchedulerService() {
    load_simple_config();
//    load_advance_config();
    ResMgrInst::GetInstance()->Start();
    SchedInst::GetInstance()->Start();
    JobMgrInst::GetInstance()->Start();
}

void
StopSchedulerService() {
    JobMgrInst::GetInstance()->Stop();
    SchedInst::GetInstance()->Stop();
    ResMgrInst::GetInstance()->Stop();
}
}
}
}