/*******************************************************************************
* Copyright 2017 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 <assert.h>
#include <limits.h>
#include <stdint.h>

#include <algorithm>
#include <cctype>
#include <fstream>
#include <functional>
#include <string>
#include <utility>
#include <vector>

#include "oneapi/dnnl/dnnl.h"

#include "common.hpp"

#include "utils/fill.hpp"
#include "utils/parallel.hpp"

/* result structure */
const char *state2str(res_state_t state) {
    if (state == UNTESTED) return "UNTESTED_FAILED"; // for easier fail search

#define CASE(x) \
    if (state == (x)) return STRINGIFY(x)
    CASE(PASSED);
    CASE(SKIPPED);
    CASE(MISTRUSTED);
    CASE(UNIMPLEMENTED);
    CASE(INVALID_ARGUMENTS);
    CASE(FAILED);
    CASE(LISTED);
    CASE(EXECUTED);
    CASE(INITIALIZED);
    CASE(DEFERRED);
#undef CASE
    assert(!"unknown res state");
    return "STATE_UNDEF";
}

namespace skip_reason {
std::string case_not_supported("Case not supported");
std::string data_type_not_supported("Data type not supported");
std::string invalid_case("Invalid case");
std::string not_enough_ram("Not enough RAM");
std::string skip_impl_hit("Skip-impl option hit");
std::string skip_start("Skip-start option hit");
} // namespace skip_reason

dir_t str2dir(const char *str) {
#define CASE(x) \
    if (!strcasecmp(STRINGIFY(x), str)) return x
    CASE(FWD_D);
    CASE(FWD_I);
    CASE(FWD_B);
    CASE(BWD_D);
    CASE(BWD_W);
    CASE(BWD_WB);
    CASE(BWD_DW);
#undef CASE
    assert(!"unknown dir");
    return DIR_UNDEF;
}

void parse_result(res_t &res, const char *pstr) {
    auto &bs = benchdnn_stat;

    // Can be updated for `INITIALIZED`. TODO: remove this.
    const char *state = state2str(res.state);
    bool is_failed = false;
    bool print_me = true;

    switch (res.state) {
        case UNTESTED: is_failed = true; break;
        case EXECUTED:
            bs.passed++;
            if (bench_mode != bench_mode_t::exec) print_me = false;
            break;
        case FAILED: is_failed = true; break;
        case SKIPPED: bs.skipped++; break;
        case DEFERRED:
        case UNIMPLEMENTED:
            is_failed = true;
            bs.unimplemented++;
            break;
        case INVALID_ARGUMENTS:
            is_failed = true;
            bs.invalid_arguments++;
            break;
        case MISTRUSTED: bs.mistrusted++; break;
        case PASSED: bs.passed++; break;
        case LISTED: bs.listed++; break;
        case INITIALIZED:
            // TODO: workaround for failed fill functions.
            if (bench_mode != bench_mode_t::init) {
                is_failed = true;
                state = "FAILED";
            } else {
                bs.passed++;
            }
            break;
        default:
            BENCHDNN_PRINT(0, "%s\n",
                    "Error: unknown state encountered in \'parse_results()\'.");
            SAFE_V(FAIL);
    }

    std::string reason;
    if (!res.reason.empty()) { reason = " (" + res.reason + ")"; }

    std::string error_stat;
    if (res.errors > 0) {
        error_stat = " (errors:" + std::to_string(res.errors)
                + " total:" + std::to_string(res.total) + ")";
    }

    using bt = timer::timer_t;

    const auto &tct = res.timer_map.get_timer(timer::names::test_case_timer);
    // Round to integer for nicer input.
    // Use `sum` mode because it consists of two separate parts - creation and
    // execution.
    const int64_t tct_ms = static_cast<int64_t>(tct.ms(bt::mode_t::sum));
    std::string tct_str = " (" + std::to_string(tct_ms) + " ms)";

    // This is the common format of the repro line ([] - for optional entries):
    // case_num:status[ (reason)][ (error_stats)] (time) __REPRO: prb_str
    std::string full_repro = std::to_string(bs.tests) + ":" + std::string(state)
            + reason + error_stat + tct_str + " __REPRO: " + pstr;
    if (is_failed) {
        bs.failed++;
        bs.failed_cases.emplace(bs.tests, full_repro);
        // In theory, this can pop up for unimplemented and invalid args, too.
        // Shouldn't be a problem though.
        if (!buffer_prefix.empty()) {
            BENCHDNN_PRINT(0, "%s\n",
                    "Note: importing data from a file led to a correctness "
                    "issue. It is impossible to tell if that was a real oneDNN "
                    "bug or just benchdnn refusing to acknowledge a minuscule "
                    "difference as a match. Take this 'FAILED' with a grain of "
                    "salt, and proceed with extra caution.");
        }
    }
    if (print_me) { BENCHDNN_PRINT(0, "%s\n", full_repro.c_str()); }

    // Update this after collecting stats.
    bs.tests++;
    assert(bs.tests
            == bs.passed + bs.skipped + bs.mistrusted + bs.failed + bs.listed);

    if (has_bench_mode_bit(mode_bit_t::perf)) {
        const auto &t = res.timer_map.perf_timer();
        for (int mode = 0; mode < (int)bt::n_modes; ++mode)
            bs.ms[timer::names::perf_timer][mode] += t.ms((bt::mode_t)mode);
    }

    for (const auto &e : timer::get_global_service_timers()) {
        const auto &supported_mode_bit = std::get<1>(e);
        if (!has_bench_mode_bit(supported_mode_bit)) continue;

        const auto &t_name = std::get<2>(e);
        const auto &t = res.timer_map.get_timer(t_name);
        // Only summary time is populated to the highest level report.
        bs.ms[t_name][bt::mode_t::sum] += t.sec(bt::mode_t::sum);
    }

    // Append an impl name into the total stats.
    // Skipped cases don't count.
    if (!res.impl_name.empty()) bs.impl_names[res.impl_name]++;
}

/* misc */

bool str2bool(const char *str) {
    return !strcasecmp("true", str) || !strcasecmp("1", str);
}

const char *bool2str(bool value) {
    return value ? "true" : "false";
}

#ifdef _WIN32
/* NOTE: this should be supported on linux as well, but currently
 * having issues for ICC170 and Clang*/
#include <regex>

bool match_regex(const char *str, const char *pattern) {
    std::regex re(pattern);
    return std::regex_search(str, re);
}
#else
#include <regex.h>
#include <sys/types.h>

bool match_regex(const char *str, const char *pattern) {
    static regex_t regex;
    static const char *prev_pattern = nullptr;
    if (pattern != prev_pattern) {
        if (prev_pattern) regfree(&regex);

        if (regcomp(&regex, pattern, 0)) {
            fprintf(stderr, "could not create regex\n");
            return true;
        }

        prev_pattern = pattern;
    }

    return !regexec(&regex, str, 0, nullptr, 0);
}
#endif /* _WIN32 */

bool skip_start(res_t *res, int idx) {
    if (idx < test_start) {
        res->state = SKIPPED;
        res->reason = skip_reason::skip_start;
        return true;
    }
    return false;
}

#if defined(_WIN32)
#include <windows.h>
#define PATH_MAX MAX_PATH
static char *dirname(char *path) {
    char drive[_MAX_DRIVE];
    char dir[_MAX_DIR];
    SAFE_V(_splitpath_s(path, drive, sizeof(drive), dir, sizeof(dir), NULL, 0,
                   NULL, 0) == 0
                    ? OK
                    : FAIL);
    path[0] = '\0';
    SAFE_V(strncat_s(path, PATH_MAX, drive, _MAX_DRIVE) == 0 ? OK : FAIL);
    SAFE_V(strncat_s(path, PATH_MAX, dir, _MAX_DIR) == 0 ? OK : FAIL);
    if (path[0] == '\0') {
        path[0] = '.';
        path[1] = '\0';
    }
    return path;
}

int readlink(const char *path, char *buf, size_t buf_max) {
    (void)path;
    // NULL means take the path of myself
    return GetModuleFileName(NULL, buf, (DWORD)buf_max);
}
#else
#include <libgen.h>
#include <unistd.h>
#endif /* _WIN32 */

std::string locate_file(const std::string &fname) {
    SAFE_V(fname.length() < PATH_MAX ? OK : FAIL);

    const int max_paths = 30;

    static int n_paths = 0;
    static std::string search_paths[max_paths];

    std::string fdir;
    {
        std::string fname_copy = fname;
        fname_copy.resize(PATH_MAX);
        char *c_fdir = dirname(&fname_copy[0]);
        fdir = std::string(c_fdir);
    }

    bool dir_found = false;
    for (int n = 0; n_paths < max_paths && n < n_paths; ++n)
        if (search_paths[n].find(fdir) == 0) {
            dir_found = true;
            break;
        }
    if (!dir_found) {
        if (n_paths >= max_paths) {
            BENCHDNN_PRINT(0, "%s%d\n",
                    "Warning: Number of searched paths exceeded ", max_paths);
        } else {
            search_paths[n_paths++] = std::move(fdir);
        }
    }

    std::ifstream ifs(fname);
    if (ifs.is_open()) return fname;

    for (int n = 0; n < n_paths; ++n) {
        std::string fullname = search_paths[n] + "/" + fname;
        ifs.open(fullname);
        if (ifs.is_open()) {
            BENCHDNN_PRINT(50, "file used: %s\n", fullname.c_str());
            ifs.close();
            return fullname;
        }
        ifs.close();
    }

    // Search in default inputs directory
    // Takes dirname(executable)/inputs/file_name on Linux
    // Takes dirname(executable)/../inputs/file_name on Windows
    fdir.resize(PATH_MAX);
    int length = readlink("/proc/self/exe", &fdir[0], PATH_MAX);
    if (length) {
        std::string s_fdir = dirname(&fdir[0]);
        for (int i_try = 0; i_try < 2; ++i_try) {
            fdir = s_fdir;
            fdir.append(i_try == 1 ? "/../inputs/" : "/inputs/");
            assert(!driver_name.empty());
            fdir.append(driver_name);
            std::string fullname = fdir + "/";
            fullname += fname;
            ifs.open(fullname);
            if (ifs.is_open()) {
                if (n_paths < max_paths)
                    search_paths[n_paths++] = std::move(fdir);
                BENCHDNN_PRINT(50, "file used: %s\n", fullname.c_str());
                ifs.close();
                return fullname;
            } else {
                BENCHDNN_PRINT(50, "File not found at: %s\n", fullname.c_str());
            }
            ifs.close();
        }
    }

    fprintf(stderr, "cannot open file %s\n", fname.c_str());
    return fname;
}

int batch(const char *fname, bench_f bench) {
    std::ifstream ifs(locate_file(std::string(fname)));
    SAFE(ifs.is_open() ? OK : FAIL, CRIT);

    std::vector<std::string> opts;
    std::string str;
    bool continued_line = false;
    while (ifs >> str) {
        if (str.empty()) continue;

        // shell style comments
        if (str.front() == '#') {
            std::string dummy;
            std::getline(ifs, dummy); // take whole commented line out
            continue;
        }

        // shell style line break
        if (continued_line) {
            if (opts.empty()) SAFE_V(FAIL);
            if (opts.back().size() + str.size() >= str.max_size()) SAFE_V(FAIL);
            // NOLINTNEXTLINE(performance-inefficient-string-concatenation)
            str = opts.back() + str; // update current line with previous
            opts.pop_back(); // take previous line out
        }

        if (str.back() == '\\') {
            continued_line = true;
            if (str.length() == 1) continue; // line break lives separately
            str.erase(str.size() - 1); // otherwise remove it
        } else {
            continued_line = false;
        }

        opts.push_back(std::move(str));
    }

    std::vector<char *> c_opts;
    c_opts.reserve(opts.size());
    for (const auto &opt : opts)
        c_opts.push_back(const_cast<char *>(opt.c_str()));

    return bench(static_cast<int>(c_opts.size()), c_opts.data());
}

int flip_coin(ptrdiff_t seed, float probability) {
    const ptrdiff_t big_prime = 1000003;
    const ptrdiff_t prime = 753737;
    seed *= prime;
    return (seed % big_prime) < (probability * big_prime);
}

int64_t div_up(const int64_t a, const int64_t b) {
    SAFE_V(b != 0 ? OK : FAIL);
    return (a + b - 1) / b;
}

size_t div_up(const size_t a, const size_t b) {
    SAFE_V(b != 0 ? OK : FAIL);
    return (a + b - 1) / b;
}

int64_t rnd_up(const int64_t a, const int64_t b) {
    SAFE_V(b != 0 ? OK : FAIL);
    return div_up(a, b) * b;
}

size_t rnd_up(const size_t a, const size_t b) {
    SAFE_V(b != 0 ? OK : FAIL);
    return div_up(a, b) * b;
}

int64_t next_pow2(int64_t a) {
    assert(a > 0 && a <= ((int64_t)1 << 62));
    if (a > 1) a--;
    while (a & (a - 1))
        a &= (a - 1);
    return a << 1;
}

#if defined(__x86_64__) || defined(_M_X64)
#include <immintrin.h>
#include <xmmintrin.h>

int mxcsr_cvt(float f) {
    return _mm_cvtss_si32(_mm_load_ss(&f));
}
void init_fp_mode() {
    // We set ftz to avoid denormals in perf measurements
    _MM_SET_FLUSH_ZERO_MODE(_MM_FLUSH_ZERO_ON);
}
#else
int mxcsr_cvt(float f) {
    return (int)nearbyintf(f);
}
void init_fp_mode() {}
#endif

void array_set(char *arr, size_t size) {
    for (size_t i = 0; i < size; ++i)
        arr[i] = 0;
}

void gemm(const char *layout, const char *transa, const char *transb, int64_t m,
        int64_t n, int64_t k, const float alpha, const float *a,
        const int64_t lda, const float *b, const int64_t ldb, const float beta,
        float *c, const int64_t ldc) {
#if DNNL_CPU_RUNTIME != DNNL_RUNTIME_NONE
    if (*layout == 'C') {
        dnnl_sgemm(
                *transa, *transb, m, n, k, alpha, a, lda, b, ldb, beta, c, ldc);
    } else {
        dnnl_sgemm(
                *transb, *transa, n, m, k, alpha, b, ldb, a, lda, beta, c, ldc);
    }
#else
    if (std::toupper(*layout) != 'C') {
        gemm("C", transb, transa, n, m, k, alpha, b, ldb, a, lda, beta, c, ldc);
        return;
    }

    auto a_accessor = [&](int64_t i, int64_t j) {
        if (std::toupper(*transa) == 'N') return a[i * lda + j];
        return a[j * lda + i];
    };

    auto b_accessor = [&](int64_t i, int64_t j) {
        if (std::toupper(*transb) == 'N') return b[i * ldb + j];
        return b[j * ldb + i];
    };

    benchdnn_parallel_nd(m, n, [&](int64_t i, int64_t j) {
        float ab = 0.0f;
        for (int64_t _k = 0; _k < k; ++_k)
            ab += a_accessor(i, _k) * b_accessor(_k, j);
        float cij = (beta == 0) ? 0.0f : beta * c[i * ldc + j];
        c[i * ldc + j] = alpha * ab + cij;
    });
#endif
}

int sanitize_desc(int &ndims, std::vector<std::reference_wrapper<int64_t>> d,
        std::vector<std::reference_wrapper<int64_t>> h,
        std::vector<std::reference_wrapper<int64_t>> w,
        const std::vector<int64_t> &def_values, const char *str,
        bool must_have_spatial) {
    size_t N = d.size();
    assert(h.size() == N && w.size() == N && def_values.size() == N);

    ndims = 5;

    // check output spatial values
    const bool no_d = d[0].get() == 0;
    const bool no_h = h[0].get() == 0;
    const bool no_w = w[0].get() == 0;

    if (no_d) ndims--;
    if (no_d && no_h) ndims--;
    if (no_d && no_h && no_w) ndims--;
    if (must_have_spatial && ndims <= 2) {
        BENCHDNN_PRINT(0,
                "ERROR: the problem must have at least one spatial dimension "
                "specified. Full descriptor input: `%s`.\n",
                str);
        return FAIL;
    }

    if (ndims == 5) {
        if (no_h && no_w) {
            // User specified values for the d dimension but not values for h
            // and w dimensions. Propagate d values to h and w dimensions.
            for (size_t n = 0; n < N; ++n)
                w[n].get() = h[n].get() = d[n].get();
        } else if (!no_h && !no_w) {
            // User specified them all, good to go.
        } else {
            BENCHDNN_PRINT(0,
                    "ERROR: the problem requires either all `h` and `w` "
                    "dimensions specified or none of them. Full descriptor "
                    "input: `%s`.\n",
                    str);
            return FAIL;
        }
    } else if (ndims == 4 && no_w) {
        // User specified values for the h dimension but not values for the w
        // dimension. Propagate h values to the w dimension.
        for (size_t n = 0; n < N; ++n)
            w[n].get() = h[n].get();
    }

    for (size_t n = 0; n < N; ++n) {
        if (ndims < 5) d[n].get() = def_values[n];
        if (ndims < 4) h[n].get() = def_values[n];
        if (ndims < 3) w[n].get() = def_values[n];
    }

    return OK;
}

void print_dhw(bool &print_d, bool &print_h, bool &print_w, int ndims,
        const std::vector<int64_t> &d, const std::vector<int64_t> &h,
        const std::vector<int64_t> &w) {
    size_t N = d.size();
    assert(h.size() == N && w.size() == N);

    bool square_shape = true, cubic_shape = true;
    for (size_t n = 0; n < N; ++n) {
        square_shape = square_shape && h[n] == w[n];
        cubic_shape = cubic_shape && d[n] == h[n] && h[n] == w[n];
    }

    print_d = ndims == 5;
    print_h = ndims == 4 || (ndims == 5 && (!cubic_shape || canonical));
    print_w = ndims == 3 || (ndims == 5 && (!cubic_shape || canonical))
            || (ndims == 4 && (!square_shape || canonical));
}

// Copied from utils::getenv.
// An underlined unified implementation for getting env var value.
int getenv(const char *name, char *buffer, int buffer_size) {
    if (name == nullptr || buffer_size < 0
            || (buffer == nullptr && buffer_size > 0))
        return INT_MIN;

    int result = 0;
    int term_zero_idx = 0;
    size_t value_length = 0;

#ifdef _WIN32
    value_length = GetEnvironmentVariable(name, buffer, buffer_size);
#else
    const char *value = ::getenv(name);
    value_length = value == nullptr ? 0 : strlen(value);
#endif

    if (value_length > INT_MAX)
        result = INT_MIN;
    else {
        int int_value_length = (int)value_length;
        if (int_value_length >= buffer_size) {
            result = -int_value_length;
        } else {
            term_zero_idx = int_value_length;
            result = int_value_length;
#ifndef _WIN32
            if (value) strncpy(buffer, value, buffer_size - 1);
#endif
        }
    }

    if (buffer != nullptr) buffer[term_zero_idx] = '\0';
    return result;
}

// Copied from utils::getenv_int_user.
// Collects an integer value from an env var.
int benchdnn_getenv_int(const char *name, int default_value) {
    int value = default_value;
    // # of digits in the longest 32-bit signed int + sign + terminating null
    const int len = 12;
    char value_str[len];
    if (getenv(name, value_str, len) > 0) { value = atoi(value_str); }
    return value;
}

// Copied from utils::getenv_string_user.
// Collects a string lower case value from an env var.
std::string benchdnn_getenv_string(const char *name) {
    // Random number to fit possible string input.
    std::string value;
    const int len = 128;
    char value_str[len];
    if (getenv(name, value_str, len) > 0) { value = value_str; }
    std::transform(value.begin(), value.end(), value.begin(), ::tolower);
    return value;
}

std::string smart_bytes(double bytes) {
    std::string s;
    static constexpr int oneK = 1024;

    if (bytes < oneK) {
        s = std::to_string(static_cast<size_t>(bytes)) + " B";
        return s;
    }
    auto KB = bytes / oneK;
    if (KB < oneK) {
        s = std::to_string(KB) + " KB";
        return s;
    }
    auto MB = KB / oneK;
    if (MB < oneK) {
        s = std::to_string(MB) + " MB";
        return s;
    }
    auto GB = MB / oneK;
    s = std::to_string(GB) + " GB";
    return s;
}