/**
 * Copyright (c) 2019, Timothy Stack
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * * 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.
 * * Neither the name of Timothy Stack 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 REGENTS 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 REGENTS 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.
 *
 * @file column_namer.cc
 */

#include "config.h"

#include <algorithm>

#include "sql_util.hh"

#include "base/lnav_log.hh"
#include "column_namer.hh"

bool column_namer::existing_name(const std::string &in_name) const
{
    if (std::binary_search(std::begin(sql_keywords),
                           std::end(sql_keywords),
                           toupper(in_name))) {
        return true;
    }

    if (std::find(this->cn_builtin_names.begin(),
                  this->cn_builtin_names.end(),
                  in_name) != this->cn_builtin_names.end()) {
        return true;
    }

    if (std::find(this->cn_names.begin(),
                  this->cn_names.end(),
                  in_name) != this->cn_names.end()) {
        return true;
    }

    return false;
}

std::string column_namer::add_column(const std::string &in_name)
{
    std::string base_name = in_name, retval;
    size_t      buf_size;
    int         num = 0;

    buf_size = in_name.length() + 64;
    char buffer[buf_size];
    if (in_name.empty()) {
        base_name = "col";
    }

    retval = base_name;

    auto counter_iter = this->cn_name_counters.find(retval);
    if (counter_iter != this->cn_name_counters.end()) {
        num = ++counter_iter->second;
        snprintf(buffer, buf_size, "%s_%d", base_name.c_str(), num);
        retval = buffer;
    }

    while (this->existing_name(retval)) {
        if (num == 0) {
            this->cn_name_counters[retval] = num;
        }

        log_debug("column name already exists: %s", retval.c_str());
        snprintf(buffer, buf_size, "%s_%d", base_name.c_str(), num);
        retval = buffer;
        num += 1;
    }

    this->cn_names.push_back(retval);

    return retval;
}
