/*******************************************************************************
* Copyright 2016 Intel Corporation
*
* Licensed 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.
*******************************************************************************/

#ifndef COMMON_PRIMITIVE_HPP
#define COMMON_PRIMITIVE_HPP

#include "common/c_types_map.hpp"
#include "common/cache_blob.hpp"
#include "common/cache_hit_types.hpp"
#include "common/primitive_desc.hpp"
#include "common/primitive_exec_types.hpp"

#include <cassert>
#include <type_traits>

namespace dnnl {
namespace impl {

struct resource_mapper_t;
// Primitive implementation
struct primitive_t : public c_compatible {
    using primitive_list_t = std::vector<const primitive_t *>;

    primitive_t(const primitive_desc_t *pd) : pd_(pd->clone()) {}
    virtual ~primitive_t() = default;

    virtual status_t init(impl::engine_t *engine) { return status::success; }

    status_t init(engine_t *engine, bool use_global_scratchpad,
            const cache_blob_t &cache_blob) {
        cache_blob_ = cache_blob;
        CHECK(init(engine));
        use_global_scratchpad_ = use_global_scratchpad;
        // The `cache_blob_` is no longer needed after primitive creation.
        cache_blob_ = cache_blob_t();
        return status::success;
    }

    const std::shared_ptr<primitive_desc_t> &pd() const { return pd_; }
    primitive_kind_t kind() const { return pd_->kind(); }
    virtual status_t execute(const exec_ctx_t &ctx) const = 0;

    virtual status_t get_cache_blob(
            engine_t *engine, cache_blob_t &cache_blob) const {
        assert(!"unexpected");
        return status::runtime_error;
    }

    virtual status_t get_cache_blob_size(engine_t *engine, size_t *size) const {
        assert(!"unexpected");
        return status::runtime_error;
    }

    virtual status_t create_resource(
            impl::engine_t *engine, resource_mapper_t &mapper) const {
        return status::success;
    }

    bool use_global_scratchpad() const { return use_global_scratchpad_; }
    cache_blob_t cache_blob() const { return cache_blob_; }
    cache_state_t creation_cache_state() const {
        return creation_cached_state_;
    }

protected:
    template <typename impl_type, typename pd_t>
    static status_t create_primitive_common(
            std::pair<std::shared_ptr<primitive_t>, cache_state_t> &primitive,
            const pd_t *pd, engine_t *engine, bool use_global_scratchpad,
            const cache_blob_t &cache_blob, bool force_create_from_blob) {

        auto global_primitive_cache = primitive_cache();
        primitive_hashing::key_t key(pd, engine);

        struct create_context_t {
            engine_t *engine;
            const pd_t *pd;
            const cache_blob_t &cache_blob;
            bool use_global_scratchpad;
            cache_state_t cache_status;
        };

        create_context_t context {
                // default to primitive_cache_hit, create() will flag partial/complete cache miss
                engine, pd, cache_blob, use_global_scratchpad,
                force_create_from_blob ? cache_state_t::persistent_hit
                                       : cache_state_t::primitive_hit};

        primitive_cache_iface_t::create_func_ptr_t create = [](void *context) {
            auto &c = *static_cast<create_context_t *>(context);
            std::shared_ptr<primitive_t> p = std::make_shared<impl_type>(c.pd);
            status_t status
                    = p->init(c.engine, c.use_global_scratchpad, c.cache_blob);
            c.cache_status = p->creation_cache_state();
            return primitive_cache_iface_t::result_t {std::move(p), status};
        };
        auto result = global_primitive_cache.get_or_create(
                key, *create, &context, force_create_from_blob);
        primitive = {std::move(result.value), context.cache_status};
        return result.status;
    }

    std::shared_ptr<primitive_desc_t> pd_;
    bool use_global_scratchpad_ = false;
    cache_blob_t cache_blob_;
    cache_state_t creation_cached_state_ = cache_state_t::miss;

private:
    primitive_t() = delete;
    DNNL_DISALLOW_COPY_AND_ASSIGN(primitive_t);
};

} // namespace impl
} // namespace dnnl

#define ARG_PTR_TYPE(t) \
    typename std::remove_cv<typename std::remove_pointer<t>::type>::type *

// Returns destination memory which has been zero pad initialized. This macro
// may result in a failure returned via the `status` input since zero pad
// may fail.
#define CTX_OUT_CLEAN_MEM(type, arg, status) \
    static_cast<ARG_PTR_TYPE(type)>(ctx.host_ptr(arg, true, &(status)))

// Returns destination memory which may not have been zero pad initialized.
#define CTX_OUT_MEM_COMMON(type, arg, index) \
    static_cast<ARG_PTR_TYPE(type)>(ctx.host_ptr(arg, false, nullptr, index))
#define CTX_OUT_MEm(type, arg) CTX_OUT_MEM_COMMON(type, arg, 0)
#define CTX_OUT_MEm0(type, arg) CTX_OUT_MEM_COMMON(type, arg, 0)
#define CTX_OUT_MEm1(type, arg) CTX_OUT_MEM_COMMON(type, arg, 1)
#define CTX_OUT_MEm2(type, arg) CTX_OUT_MEM_COMMON(type, arg, 2)

#define CTX_IN_MEM_COMMON(type, arg, index) \
    static_cast<const ARG_PTR_TYPE(type)>( \
            ctx.host_ptr(arg, false, nullptr, index))
#define CTX_IN_MEm(type, arg) CTX_IN_MEM_COMMON(type, arg, 0)
#define CTX_IN_MEm0(type, arg) CTX_IN_MEM_COMMON(type, arg, 0)
#define CTX_IN_MEm1(type, arg) CTX_IN_MEM_COMMON(type, arg, 1)
#define CTX_IN_MEm2(type, arg) CTX_IN_MEM_COMMON(type, arg, 2)

// __VA_ARGS__here is an index of the buffer. It is empty unless the memory
// argument is sparse.
#define CTX_IN_MEM(type, arg, ...) CTX_IN_MEm##__VA_ARGS__(type, arg)
#define CTX_OUT_MEM(type, arg, ...) CTX_OUT_MEm##__VA_ARGS__(type, arg)

#endif