// 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 "query_cache.h"

namespace doris {

std::vector<int>* QueryCacheHandle::get_cache_slot_orders() {
    DCHECK(_handle);
    auto result_ptr = reinterpret_cast<LRUHandle*>(_handle)->value;
    return &((QueryCache::CacheValue*)(result_ptr))->slot_orders;
}

CacheResult* QueryCacheHandle::get_cache_result() {
    DCHECK(_handle);
    auto result_ptr = reinterpret_cast<LRUHandle*>(_handle)->value;
    return &((QueryCache::CacheValue*)(result_ptr))->result;
}

int64_t QueryCacheHandle::get_cache_version() {
    DCHECK(_handle);
    auto result_ptr = reinterpret_cast<LRUHandle*>(_handle)->value;
    return ((QueryCache::CacheValue*)(result_ptr))->version;
}

void QueryCache::insert(const CacheKey& key, int64_t version, CacheResult& res,
                        const std::vector<int>& slot_orders, int64_t cache_size) {
    SCOPED_SWITCH_THREAD_MEM_TRACKER_LIMITER(ExecEnv::GetInstance()->query_cache_mem_tracker());
    CacheResult cache_result;
    for (auto& block_data : res) {
        cache_result.emplace_back(vectorized::Block::create_unique())
                ->swap(block_data->clone_empty());
        (void)vectorized::MutableBlock(cache_result.back().get()).merge(*block_data);
    }
    auto cache_value_ptr =
            std::make_unique<QueryCache::CacheValue>(version, std::move(cache_result), slot_orders);

    QueryCacheHandle(this, LRUCachePolicy::insert(key, (void*)cache_value_ptr.release(), cache_size,
                                                  cache_size, CachePriority::NORMAL));
}

bool QueryCache::lookup(const CacheKey& key, int64_t version, doris::QueryCacheHandle* handle) {
    SCOPED_SWITCH_THREAD_MEM_TRACKER_LIMITER(ExecEnv::GetInstance()->query_cache_mem_tracker());
    auto* lru_handle = LRUCachePolicy::lookup(key);
    if (lru_handle) {
        QueryCacheHandle tmp_handle(this, lru_handle);
        if (tmp_handle.get_cache_version() == version) {
            *handle = std::move(tmp_handle);
            return true;
        }
    }
    return false;
}

} // namespace doris