/* This file is part of the 'stringi' project.
 * Copyright (c) 2013-2024, Marek Gagolewski <https://www.gagolewski.com/>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


#include "stri_stringi.h"
#include "stri_container_utf8.h"
#include "stri_container_charclass.h"
#include "stri_container_logical.h"
#include <deque>
#include <utility>
using namespace std;


/**
 * Locate first or last occurrences of a character class in each string
 *
 * @param str character vector
 * @param pattern character vector
 * @return matrix with 2 columns
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-15)
 *          Use StrContainerCharClass
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-16)
 *          make StriException-friendly
 *
 * @version 0.2-1 (Marek Gagolewski, 2014-04-03)
 *          detects invalid UTF-8 byte stream
 *
 * @version 0.2-1 (Marek Gagolewski, 2014-04-05)
 *          StriContainerCharClass now relies on UnicodeSet
 *
 * @version 0.3-1 (Marek Gagolewski, 2014-11-04)
 *    Issue #112: str_prepare_arg* retvals were not PROTECTed from gc
 *
 * @version 1.7.1 (Marek Gagolewski, 2021-06-29)
 *     get_length
 */
SEXP stri__locate_firstlast_charclass(SEXP str, SEXP pattern, bool first, bool get_length1)
{
    PROTECT(str = stri__prepare_arg_string(str, "str"));
    PROTECT(pattern = stri__prepare_arg_string(pattern, "pattern"));
    R_len_t vectorize_length =
        stri__recycling_rule(true, 2, LENGTH(str), LENGTH(pattern));

    STRI__ERROR_HANDLER_BEGIN(2)
    StriContainerUTF8 str_cont(str, vectorize_length);
    StriContainerCharClass pattern_cont(pattern, vectorize_length);

    SEXP ret;
    STRI__PROTECT(ret = Rf_allocMatrix(INTSXP, vectorize_length, 2));
    stri__locate_set_dimnames_matrix(ret, get_length1);
    int* ret_tab = INTEGER(ret);

    for (R_len_t i = pattern_cont.vectorize_init();
            i != pattern_cont.vectorize_end();
            i = pattern_cont.vectorize_next(i))
    {
        ret_tab[i]                  = NA_INTEGER;
        ret_tab[i+vectorize_length] = NA_INTEGER;

        if (str_cont.isNA(i) || pattern_cont.isNA(i))
            continue;

        if (get_length1) {
            ret_tab[i]                  = -1;
            ret_tab[i+vectorize_length] = -1;
        }

        const UnicodeSet* pattern_cur = &pattern_cont.get(i);
        R_len_t     str_cur_n = str_cont.get(i).length();
        const char* str_cur_s = str_cont.get(i).c_str();
        R_len_t j;
        R_len_t k = 0;
        UChar32 chr;

        for (j=0; j<str_cur_n; ) {
            U8_NEXT(str_cur_s, j, str_cur_n, chr);
            if (chr < 0) // invalid UTF-8 sequence
                throw StriException(MSG__INVALID_UTF8);
            k++; // 1-based index
            if (pattern_cur->contains(chr)) {
                ret_tab[i]      = k;
                ret_tab[i+vectorize_length] = get_length1 ? 1 : ret_tab[i];
                if (first) break; // that's enough for first
                // note that for last, we can't go backwards from the end, as we need a proper index!
            }
        }
    }

    STRI__UNPROTECT_ALL
    return ret;
    STRI__ERROR_HANDLER_END(;/* nothing special to be done on error */)
}


/**
 * Locate first occurrence of a character class in each string
 *
 * @param str character vector
 * @param pattern character vector
 * @return matrix with 2 columns
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
 *
 * @version 1.7.1 (Marek Gagolewski, 2021-06-29)
 *     get_length
 */
SEXP stri_locate_first_charclass(SEXP str, SEXP pattern, SEXP get_length)
{
    bool get_length1 = stri__prepare_arg_logical_1_notNA(get_length, "get_length");
    return stri__locate_firstlast_charclass(str, pattern, true, get_length1);
}


/**
 * Locate last occurrence of a character class in each string
 *
 * @param str character vector
 * @param pattern character vector
 * @return matrix with 2 columns
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
 *
 * @version 1.7.1 (Marek Gagolewski, 2021-06-29)
 *     get_length
 */
SEXP stri_locate_last_charclass(SEXP str, SEXP pattern, SEXP get_length)
{
    bool get_length1 = stri__prepare_arg_logical_1_notNA(get_length, "get_length");
    return stri__locate_firstlast_charclass(str, pattern, false, get_length1);
}


/**
 * Locate first or last occurrences of a character class in each string
 *
 * @param str character vector
 * @param pattern character vector
 * @return list of matrices with 2 columns
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-04)
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-09)
 *          use R_len_t_x2 for merge=TRUE
 *          [R_len_t_x2 changed to pair<R_len_t, R_len_t> thereafter]
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-15)
 *          Use StrContainerCharClass
 *
 * @version 0.1-?? (Marek Gagolewski, 2013-06-16)
 *          make StriException-friendly
 *
 * @version 0.2-1 (Marek Gagolewski, 2014-04-03)
 *          detects invalid UTF-8 byte stream
 *
 * @version 0.2-1 (Marek Gagolewski, 2014-04-05)
 *          StriContainerCharClass now relies on UnicodeSet
 *
 * @version 0.3-1 (Marek Gagolewski, 2014-11-02)
 *          using StriContainerCharClass::locateAll;
 *          no longer vectorized over `merge`
 *
 * @version 0.3-1 (Marek Gagolewski, 2014-11-04)
 *    Issue #112: str_prepare_arg* retvals were not PROTECTed from gc
 *
 * @version 0.4-1 (Marek Gagolewski, 2014-11-27)
 *    FR #117: omit_no_match arg added
 *
 * @version 1.7.1 (Marek Gagolewski, 2021-06-29)
 *     get_length
 */
SEXP stri_locate_all_charclass(SEXP str, SEXP pattern, SEXP merge, SEXP omit_no_match, SEXP get_length)
{
    bool omit_no_match1 = stri__prepare_arg_logical_1_notNA(omit_no_match, "omit_no_match");
    bool get_length1 = stri__prepare_arg_logical_1_notNA(get_length, "get_length");
    bool merge_cur = stri__prepare_arg_logical_1_notNA(merge, "merge");
    PROTECT(str     = stri__prepare_arg_string(str, "str"));
    PROTECT(pattern = stri__prepare_arg_string(pattern, "pattern"));
    R_len_t vectorize_length = stri__recycling_rule(true, 2,
                               LENGTH(str), LENGTH(pattern));

    STRI__ERROR_HANDLER_BEGIN(2)
    StriContainerUTF8 str_cont(str, vectorize_length);
    StriContainerCharClass pattern_cont(pattern, vectorize_length);

    SEXP ret;
    STRI__PROTECT(ret = Rf_allocVector(VECSXP, vectorize_length));

    for (R_len_t i = pattern_cont.vectorize_init();
            i != pattern_cont.vectorize_end();
            i = pattern_cont.vectorize_next(i))
    {
        if (pattern_cont.isNA(i) || str_cont.isNA(i)) {
            SET_VECTOR_ELT(ret, i, stri__matrix_NA_INTEGER(1, 2));
            continue;
        }

        deque< pair<R_len_t, R_len_t> > occurrences;
        StriContainerCharClass::locateAll(
            occurrences, &pattern_cont.get(i),
            str_cont.get(i).c_str(), str_cont.get(i).length(), merge_cur,
            true /* code point-based indexes */
        );

        R_len_t noccurrences = (R_len_t)occurrences.size();
        if (noccurrences == 0) {
            SET_VECTOR_ELT(ret, i, stri__matrix_NA_INTEGER(omit_no_match1?0:1, 2, get_length1?-1:NA_INTEGER));
            continue;
        }

        SEXP cur_res;
        STRI__PROTECT(cur_res = Rf_allocMatrix(INTSXP, noccurrences, 2));
        int* cur_res_int = INTEGER(cur_res);
        deque< pair<R_len_t, R_len_t> >::iterator iter = occurrences.begin();
        for (R_len_t f = 0; iter != occurrences.end(); ++iter, ++f) {
            pair<R_len_t, R_len_t> curoccur = *iter;
            cur_res_int[f] = curoccur.first+1; // 0-based => 1-based
            cur_res_int[f+noccurrences] = get_length1?(curoccur.second-cur_res_int[f]+1):curoccur.second;
        }
        SET_VECTOR_ELT(ret, i, cur_res);
        STRI__UNPROTECT(1)
    }

    stri__locate_set_dimnames_list(ret, get_length1);
    STRI__UNPROTECT_ALL
    return ret;
    STRI__ERROR_HANDLER_END(;/* nothing special to be done on error */)
}
