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<?php

/*

 * This file is part of the Symfony package.

 *

 * (c) Fabien Potencier <fabien@symfony.com>

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Symfony\Component\Console;

use Symfony\Component\Console\Output\AnsiColorMode;

class Terminal

{

    public const DEFAULT_COLOR_MODE = AnsiColorMode::Ansi4;

    private static ?AnsiColorMode $colorMode = null;

    private static ?int $width = null;

    private static ?int $height = null;

    private static ?bool $stty = null;

    /**

     * About Ansi color types: https://en.wikipedia.org/wiki/ANSI_escape_code#Colors

     * For more information about true color support with terminals https://github.com/termstandard/colors/.

     */

    public static function getColorMode(): AnsiColorMode

    {

        // Use Cache from previous run (or user forced mode)

        if (null !== self::$colorMode) {

            return self::$colorMode;

        }

        // Try with $COLORTERM first

        if (\is_string($colorterm = getenv('COLORTERM'))) {

            $colorterm = strtolower($colorterm);

            if (str_contains($colorterm, 'truecolor')) {

                self::setColorMode(AnsiColorMode::Ansi24);

                return self::$colorMode;

            }

            if (str_contains($colorterm, '256color')) {

                self::setColorMode(AnsiColorMode::Ansi8);

                return self::$colorMode;

            }

        }

        // Try with $TERM

        if (\is_string($term = getenv('TERM'))) {

            $term = strtolower($term);

            if (str_contains($term, 'truecolor')) {

                self::setColorMode(AnsiColorMode::Ansi24);

                return self::$colorMode;

            }

            if (str_contains($term, '256color')) {

                self::setColorMode(AnsiColorMode::Ansi8);

                return self::$colorMode;

            }

        }

        self::setColorMode(self::DEFAULT_COLOR_MODE);

        return self::$colorMode;

    }

    /**

     * Force a terminal color mode rendering.

     */

    public static function setColorMode(?AnsiColorMode $colorMode): void

    {

        self::$colorMode = $colorMode;

    }

    /**

     * Gets the terminal width.

     */

    public function getWidth(): int

    {

        $width = getenv('COLUMNS');

        if (false !== $width) {

            return (int) trim($width);

        }

        if (null === self::$width) {

            self::initDimensions();

        }

        return self::$width ?: 80;

    }

    /**

     * Gets the terminal height.

     */

    public function getHeight(): int

    {

        $height = getenv('LINES');

        if (false !== $height) {

            return (int) trim($height);

        }

        if (null === self::$height) {

            self::initDimensions();

        }

        return self::$height ?: 50;

    }

    /**

     * @internal

     */

    public static function hasSttyAvailable(): bool

    {

        if (null !== self::$stty) {

            return self::$stty;

        }

        // skip check if exec function is disabled

        if (!\function_exists('exec')) {

            return false;

        }

        exec('stty 2>&1', $output, $exitcode);

        return self::$stty = 0 === $exitcode;

    }

    private static function initDimensions()

    {

        if ('\\' === \DIRECTORY_SEPARATOR) {

            $ansicon = getenv('ANSICON');

            if (false !== $ansicon && preg_match('/^(\d+)x(\d+)(?: \((\d+)x(\d+)\))?$/', trim($ansicon), $matches)) {

                // extract [w, H] from "wxh (WxH)"

                // or [w, h] from "wxh"

                self::$width = (int) $matches[1];

                self::$height = isset($matches[4]) ? (int) $matches[4] : (int) $matches[2];

            } elseif (!self::hasVt100Support() && self::hasSttyAvailable()) {

                // only use stty on Windows if the terminal does not support vt100 (e.g. Windows 7 + git-bash)

                // testing for stty in a Windows 10 vt100-enabled console will implicitly disable vt100 support on STDOUT

                self::initDimensionsUsingStty();

            } elseif (null !== $dimensions = self::getConsoleMode()) {

                // extract [w, h] from "wxh"

                self::$width = (int) $dimensions[0];

                self::$height = (int) $dimensions[1];

            }

        } else {

            self::initDimensionsUsingStty();

        }

    }

    /**

     * Returns whether STDOUT has vt100 support (some Windows 10+ configurations).

     */

    private static function hasVt100Support(): bool

    {

        return \function_exists('sapi_windows_vt100_support') && sapi_windows_vt100_support(fopen('php://stdout', 'w'));

    }

    /**

     * Initializes dimensions using the output of an stty columns line.

     */

    private static function initDimensionsUsingStty()

    {

        if ($sttyString = self::getSttyColumns()) {

            if (preg_match('/rows.(\d+);.columns.(\d+);/is', $sttyString, $matches)) {

                // extract [w, h] from "rows h; columns w;"

                self::$width = (int) $matches[2];

                self::$height = (int) $matches[1];

            } elseif (preg_match('/;.(\d+).rows;.(\d+).columns/is', $sttyString, $matches)) {

                // extract [w, h] from "; h rows; w columns"

                self::$width = (int) $matches[2];

                self::$height = (int) $matches[1];

            }

        }

    }

    /**

     * Runs and parses mode CON if it's available, suppressing any error output.

     *

     * @return int[]|null An array composed of the width and the height or null if it could not be parsed

     */

    private static function getConsoleMode(): ?array

    {

        $info = self::readFromProcess('mode CON');

        if (null === $info || !preg_match('/--------+\r?\n.+?(\d+)\r?\n.+?(\d+)\r?\n/', $info, $matches)) {

            return null;

        }

        return [(int) $matches[2], (int) $matches[1]];

    }

    /**

     * Runs and parses stty -a if it's available, suppressing any error output.

     */

    private static function getSttyColumns(): ?string

    {

        return self::readFromProcess(['stty', '-a']);

    }

    private static function readFromProcess(string|array $command): ?string

    {

        if (!\function_exists('proc_open')) {

            return null;

        }

        $descriptorspec = [

            1 => ['pipe', 'w'],

            2 => ['pipe', 'w'],

        ];

        $cp = \function_exists('sapi_windows_cp_set') ? sapi_windows_cp_get() : 0;

        $process = proc_open($command, $descriptorspec, $pipes, null, null, ['suppress_errors' => true]);

        if (!\is_resource($process)) {

            return null;

        }

        $info = stream_get_contents($pipes[1]);

        fclose($pipes[1]);

        fclose($pipes[2]);

        proc_close($process);

        if ($cp) {

            sapi_windows_cp_set($cp);

        }

        return $info;

    }

}