// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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.

#pragma once

#include <cstring>

#include <functional>

#include <vector>

#include "common/logging.h"

#include "vec/common/string_ref.h"

#include "vec/common/string_searcher.h"

namespace doris {

class StringSearch {

public:

    virtual ~StringSearch() = default;

    StringSearch() : _pattern(nullptr) {}

    StringSearch(const StringRef* pattern) { set_pattern(pattern); }

    void set_pattern(const StringRef* pattern) {

        _pattern = pattern;

        _str_searcher.reset(new ASCIICaseSensitiveStringSearcher(pattern->data, pattern->size));

    }

    // search for this pattern in str.

    //   Returns the offset into str if the pattern exists

    //   Returns -1 if the pattern is not found

    int search(const StringRef* str) const {

        auto it = search(str->data, str->size);

        if (it == str->data + str->size) {

            return -1;

        } else {

            return it - str->data;

        }

    }

    int search(const StringRef& str) const {

        auto it = search(str.data, str.size);

        if (it == str.data + str.size) {

            return -1;

        } else {

            return it - str.data;

        }

    }

    // search for this pattern in str.

    //   Returns the offset into str if the pattern exists

    //   Returns str+len if the pattern is not found

    const char* search(const char* str, size_t len) const {

        if (!str || !_pattern || _pattern->size == 0) {

            return str + len;

        }

        return _str_searcher->search(str, len);

    }

    inline size_t get_pattern_length() { return _pattern ? _pattern->size : 0; }

private:

    const StringRef* _pattern;

    std::unique_ptr<ASCIICaseSensitiveStringSearcher> _str_searcher;

};

} // namespace doris