/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2024 Cppcheck team.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "color.h"

#include <cstdlib>
#include <sstream>
#include <iostream>

#ifndef _WIN32
#include <unistd.h>
#endif

bool gDisableColors = false;

#ifndef _WIN32
static bool isStreamATty(const std::ostream & os)
{
    static const bool stdout_tty = isatty(STDOUT_FILENO);
    static const bool stderr_tty = isatty(STDERR_FILENO);
    if (&os == &std::cout)
        return stdout_tty;
    if (&os == &std::cerr)
        return stderr_tty;
    return (stdout_tty && stderr_tty);
}
#endif

static bool isColorEnabled(const std::ostream & os)
{
    // See https://bixense.com/clicolors/
    static const bool color_forced_off = (nullptr != std::getenv("NO_COLOR"));
    if (color_forced_off)
    {
        return false;
    }
    static const bool color_forced_on = (nullptr != std::getenv("CLICOLOR_FORCE"));
    if (color_forced_on)
    {
        return true;
    }
#ifdef _WIN32
    (void)os;
    return false;
#else
    return isStreamATty(os);
#endif
}

std::ostream& operator<<(std::ostream & os, Color c)
{
    if (!gDisableColors && isColorEnabled(os))
        return os << "\033[" << static_cast<std::size_t>(c) << "m";

    return os;
}

std::string toString(Color c)
{
    std::ostringstream ss;
    ss << c;
    return ss.str();
}