// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.

#pragma once

#include "raw_allocator.h"
#include "bufferstate.h"

namespace vespalib::datastore {

template <typename EntryT, typename RefT>
RawAllocator<EntryT, RefT>::RawAllocator(DataStoreBase &store, uint32_t typeId)
    : _store(store),
      _typeId(typeId)
{
}

template <typename EntryT, typename RefT>
typename RawAllocator<EntryT, RefT>::HandleType
RawAllocator<EntryT, RefT>::alloc(size_t num_entries, size_t extra_entries)
{
    _store.ensure_buffer_capacity(_typeId, num_entries + extra_entries);
    uint32_t buffer_id = _store.primary_buffer_id(_typeId);
    BufferState &state = _store.getBufferState(buffer_id);
    assert(state.isActive());
    RefT ref(state.size(), buffer_id);
    EntryT *buffer = _store.getEntryArray<EntryT>(ref, state.getArraySize());
    state.stats().pushed_back(num_entries);
    return HandleType(ref, buffer);
}

template <typename EntryT, typename RefT>
template <typename BufferType>
typename RawAllocator<EntryT, RefT>::HandleType
RawAllocator<EntryT, RefT>::alloc_dynamic_array(size_t array_size)
{
    _store.ensure_buffer_capacity(_typeId, 1);
    uint32_t buffer_id = _store.primary_buffer_id(_typeId);
    BufferState &state = _store.getBufferState(buffer_id);
    assert(state.isActive());
    assert(state.getArraySize() >= array_size);
    RefT ref(state.size(), buffer_id);
    auto entry_size = _store.get_entry_size(_typeId);
    EntryT* buffer = BufferType::get_entry(_store.getBuffer(ref.bufferId()), ref.offset(), entry_size);
    BufferType::set_dynamic_array_size(buffer, array_size);
    state.stats().pushed_back(1);
    return HandleType(ref, buffer);
}

}