/*******************************************************************************
* Copyright 2017-2021 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 LRN_HPP
#define LRN_HPP

#include <assert.h>
#include <limits.h>
#include <stdint.h>

#include <iostream>

#include "common.hpp"
#include "dnn_types.hpp"
#include "dnnl_common.hpp"
#include "dnnl_debug.hpp"
#include "dnnl_memory.hpp"
#include "utils/perf_report.hpp"

namespace lrn {

enum alg_t { ACROSS, WITHIN };
alg_t str2alg(const char *str);
const char *alg2str(alg_t alg);
dnnl_alg_kind_t alg2alg_kind(alg_t alg);

struct desc_t {
    int64_t mb, ic, id, ih, iw;
    int64_t ls;
    float alpha, beta, k;
    const char *name;
    int ndims;
};
int str2desc(desc_t *desc, const char *str);
std::ostream &operator<<(std::ostream &s, const desc_t &d);

struct settings_t {
    settings_t() = default;

    // ctor to save certain fields from resetting
    settings_t(const char *perf_template) : settings_t() {
        this->perf_template = perf_template;
    }

    desc_t desc {};

    std::vector<dir_t> dir {FWD_D};
    std::vector<dnnl_data_type_t> dt {dnnl_f32};
    std::vector<std::string> tag {tag::abx};
    std::vector<alg_t> alg {ACROSS};
    std::vector<int64_t> mb {0};
    std::vector<dnnl_scratchpad_mode_t> scratchpad_mode {
            dnnl_scratchpad_mode_library};

    const char *perf_template_csv
            = "perf,%engine%,%impl%,%name%,%dir%,%dt%,%tag%,%alg%,%DESC%,%-"
              "time%,%0time%";
    const char *perf_template_def
            = "perf,%engine%,%impl%,%name%,%prb%,%-time%,%0time%";
    const char *perf_template = perf_template_def;

    void reset() { *this = settings_t(perf_template); }
};

struct prb_t : public desc_t {
    prb_t(const desc_t &desc, int64_t mb, dir_t dir, dnnl_data_type_t dt,
            const std::string &tag, alg_t alg, const attr_t &attr)
        : desc_t(desc)
        , dir(dir)
        , dt(dt)
        , tag(tag)
        , alg(alg)
        , attr(attr)
        , user_mb(mb) {
        if (mb) this->mb = mb;
    }
    ~prb_t() {}

    dir_t dir;
    dnnl_data_type_t dt;
    std::string tag;
    alg_t alg;
    attr_t attr;
    int64_t user_mb;

    BENCHDNN_DISALLOW_COPY_AND_ASSIGN(prb_t);
};
std::ostream &operator<<(std::ostream &s, const prb_t &prb);

struct perf_report_t : public base_perf_report_t {
    perf_report_t(const prb_t *prb, const char *perf_template)
        : base_perf_report_t(perf_template)
        , p_(prb)
        , tag_(normalize_tag(p_->tag, p_->ndims)) {}

    void dump_alg(std::ostream &s) const override { s << alg2str(p_->alg); }

    void dump_desc(std::ostream &s) const override {
        s << static_cast<const desc_t &>(*p_);
    }

    void dump_desc_csv(std::ostream &s) const override {
        s << p_->mb << ',' << p_->ic << ',' << p_->id << ',' << p_->ih << ','
          << p_->iw << ',' << p_->ls << ',' << p_->alpha << ',' << p_->beta
          << ',' << p_->k;
    }

    const int64_t *user_mb() const override { return &p_->user_mb; }
    const char *name() const override { return p_->name; }
    const dir_t *dir() const override { return &p_->dir; }
    const dnnl_data_type_t *dt() const override { return &p_->dt; }
    const std::string *tag() const override { return &tag_; }

private:
    const prb_t *p_;
    std::string tag_;
};

inline int compute_n_summands(const prb_t *prb) {
    if (prb->alg == ACROSS) {
        return prb->ls;
    } else if (prb->alg == WITHIN) {
        int n_summands = 1;
        for (int64_t d = prb->ndims - 2; d > 0; --d)
            n_summands *= prb->ls;
        return n_summands;
    } else {
        assert(!"unknown algorithm");
        return 1;
    }
}

inline size_t data_off(const prb_t *prb, int64_t mb, int64_t c, int64_t d,
        int64_t h, int64_t w) {
    return (((mb * prb->ic + c) * prb->id + d) * prb->ih + h) * prb->iw + w;
}

void compute_ref_fwd(const prb_t *prb, const dnn_mem_t &src, dnn_mem_t &dst);
void compute_ref_bwd(const prb_t *prb, const dnn_mem_t &src,
        const dnn_mem_t &d_dst, dnn_mem_t &d_src);

int doit(const prb_t *prb, res_t *res);
int bench(int argc, char **argv);

} // namespace lrn

#endif
