/*******************************************************************************
* Copyright 2017-2024 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.
*******************************************************************************/

#include <sstream>

#include <assert.h>
#include <stdlib.h>

#include "lrn/lrn.hpp"

namespace lrn {

alg_t str2alg(const char *str) {
#define CASE(_alg) \
    if (!strcasecmp(STRINGIFY(_alg), str)) return _alg
    CASE(ACROSS);
    CASE(WITHIN);
#undef CASE
    assert(!"unknown algorithm");
    return ACROSS;
}

const char *alg2str(alg_t alg) {
    if (alg == ACROSS) return "ACROSS";
    if (alg == WITHIN) return "WITHIN";
    assert(!"unknown algorithm");
    return "unknown algorithm";
}

dnnl_alg_kind_t alg2alg_kind(alg_t alg) {
    if (alg == ACROSS) return dnnl_lrn_across_channels;
    if (alg == WITHIN) return dnnl_lrn_within_channel;
    assert(!"unknown algorithm");
    return dnnl_alg_kind_undef;
}

int str2desc(desc_t *desc, const char *str) {
    // Canonical form: mbXicXidXihXiwX_lsXalphaYbetaYkY_nS,
    // where
    //     X is integer
    //     Y is float
    //     S is string
    // note: symbol `_` is ignored.
    // Cubic/square shapes are supported by specifying just highest dimension.

    desc_t d {0};
    d.mb = 2;
    d.ls = 5;
    d.alpha = 1.f / 8192; // = 0.000122 ~~ 0.0001, but has exact representation
    d.beta = 0.75f;
    d.k = 1;

    const char *s = str;
    assert(s);

    auto mstrtol = [](const char *nptr, char **endptr) {
        return strtol(nptr, endptr, 10);
    };

#define CASE_NN(prb, c, cvfunc) \
    do { \
        if (!strncmp(prb, s, strlen(prb))) { \
            ok = 1; \
            s += strlen(prb); \
            char *end_s; \
            d.c = cvfunc(s, &end_s); \
            if (end_s == s) { \
                BENCHDNN_PRINT(0, \
                        "ERROR: No value found for `%s` setting. Full " \
                        "descriptor input: `%s`.\n", \
                        prb, str); \
                return FAIL; \
            } \
            s += (end_s - s); \
            if (d.c < 0) { \
                BENCHDNN_PRINT(0, \
                        "ERROR: `%s` must be positive. Full descriptor " \
                        "input: `%s`.\n", \
                        prb, str); \
                return FAIL; \
            } \
        } \
    } while (0)
#define CASE_N(c, cvfunc) CASE_NN(#c, c, cvfunc)
    while (*s) {
        int ok = 0;
        CASE_N(mb, mstrtol);
        CASE_N(ic, mstrtol);
        CASE_N(id, mstrtol);
        CASE_N(ih, mstrtol);
        CASE_N(iw, mstrtol);
        CASE_N(ls, mstrtol);
        CASE_N(alpha, strtof);
        CASE_N(beta, strtof);
        CASE_N(k, strtof);
        if (*s == 'n') {
            d.name = s + 1;
            break;
        }
        if (*s == '_') ++s;
        if (!ok) {
            BENCHDNN_PRINT(0,
                    "ERROR: Unrecognized pattern in `%s` descriptor starting "
                    "from `%s` entry.\n",
                    str, s);
            return FAIL;
        }
    }
#undef CASE_NN
#undef CASE_N

#define CHECK_SET_OR_ZERO_VAL(val_str, val) \
    if ((val) <= 0) { \
        assert((val_str)[0] == 'd' && (val_str)[1] == '.'); \
        const char *val_str__ = &(val_str)[2]; \
        BENCHDNN_PRINT(0, \
                "ERROR: setting `%s` was not specified or set to 0. Full " \
                "descriptor input: `%s`.\n", \
                val_str__, str); \
        return FAIL; \
    }

#define CHECK_SET_OR_ZERO(val) CHECK_SET_OR_ZERO_VAL(#val, val)

    CHECK_SET_OR_ZERO(d.ic);

    if (sanitize_desc(d.ndims, {d.id}, {d.ih}, {d.iw}, {1}, str) != OK)
        return FAIL;

    *desc = d;

    return OK;
}

std::ostream &operator<<(std::ostream &s, const desc_t &d) {
    bool print_d = true, print_h = true, print_w = true;
    print_dhw(print_d, print_h, print_w, d.ndims, {d.id}, {d.ih}, {d.iw});

    if (canonical || d.mb != 2) s << "mb" << d.mb;

    s << "ic" << d.ic;

    if (print_d) s << "id" << d.id;
    if (print_h) s << "ih" << d.ih;
    if (print_w) s << "iw" << d.iw;

    if (canonical || d.ls != 5) s << "ls" << d.ls;
    if (canonical || d.alpha != 1.f / 8192) s << "alpha" << d.alpha;
    if (canonical || d.beta != 0.75f) s << "beta" << d.beta;
    if (canonical || d.k != 1) s << "k" << d.k;

    if (!d.name.empty()) s << "n" << d.name;

    return s;
}

std::string prb_t::set_repro_line() {
    std::stringstream s;
    dump_global_params(s);
    settings_t def;

    if (canonical || dir != def.dir[0]) s << "--dir=" << dir << " ";
    if (canonical || dt != def.dt[0]) s << "--dt=" << dt << " ";
    if (canonical || tag != def.tag[0]) s << "--tag=" << tag << " ";
    if (canonical || alg != def.alg[0]) s << "--alg=" << alg2str(alg) << " ";

    s << attr;
    if (canonical || ctx_init != def.ctx_init[0])
        s << "--ctx-init=" << ctx_init << " ";
    if (canonical || ctx_exe != def.ctx_exe[0])
        s << "--ctx-exe=" << ctx_exe << " ";
    if (canonical || !impl_filter.is_def() || !global_impl_filter.is_def())
        s << impl_filter;

    s << static_cast<const desc_t &>(*this);

    return s.str();
}

} // namespace lrn
