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<?php
/**
 * Phinx
 *
 * (The MIT license)
 * Copyright (c) 2015 Rob Morgan
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated * documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 * @package    Phinx
 * @subpackage Phinx\Util
 */
namespace Phinx\Util;

class Util
{
    /**
     * @var string
     */
    const DATE_FORMAT = 'YmdHis';

/**
     * @var string
     */
    const MIGRATION_FILE_NAME_PATTERN = '/^\d+_([\w_]+).php$/i';

/**
     * @var string
     */
    const SEED_FILE_NAME_PATTERN = '/^([A-Z][a-z0-9]+).php$/i';

/**
     * Gets the current timestamp string, in UTC.
     *
     * @return string
     */
    public static function getCurrentTimestamp()
    {
        $dt = new \DateTime('now', new \DateTimeZone('UTC'));

return $dt->format(static::DATE_FORMAT);
    }

/**
     * Gets an array of all the existing migration class names.
     *
     * @return string[]
     */
    public static function getExistingMigrationClassNames($path)
    {
        $classNames = [];

if (!is_dir($path)) {
            return $classNames;
        }

// filter the files to only get the ones that match our naming scheme
        $phpFiles = glob($path . DIRECTORY_SEPARATOR . '*.php');

foreach ($phpFiles as $filePath) {
            if (preg_match('/([0-9]+)_([_a-z0-9]*).php/', basename($filePath))) {
                $classNames[] = static::mapFileNameToClassName(basename($filePath));
            }
        }

return $classNames;
    }

/**
     * Get the version from the beginning of a file name.
     *
     * @param string $fileName File Name
     * @return string
     */
    public static function getVersionFromFileName($fileName)
    {
        $matches = [];
        preg_match('/^[0-9]+/', basename($fileName), $matches);

return $matches[0];
    }

/**
     * Turn migration names like 'CreateUserTable' into file names like
     * '12345678901234_create_user_table.php' or 'LimitResourceNamesTo30Chars' into
     * '12345678901234_limit_resource_names_to_30_chars.php'.
     *
     * @param string $className Class Name
     * @return string
     */
    public static function mapClassNameToFileName($className)
    {
        $arr = preg_split('/(?=[A-Z])/', $className);
        unset($arr[0]); // remove the first element ('')
        $fileName = static::getCurrentTimestamp() . '_' . strtolower(implode($arr, '_')) . '.php';

return $fileName;
    }

/**
     * Turn file names like '12345678901234_create_user_table.php' into class
     * names like 'CreateUserTable'.
     *
     * @param string $fileName File Name
     * @return string
     */
    public static function mapFileNameToClassName($fileName)
    {
        $matches = [];
        if (preg_match(static::MIGRATION_FILE_NAME_PATTERN, $fileName, $matches)) {
            $fileName = $matches[1];
        }

return str_replace(' ', '', ucwords(str_replace('_', ' ', $fileName)));
    }

/**
     * Check if a migration class name is unique regardless of the
     * timestamp.
     *
     * This method takes a class name and a path to a migrations directory.
     *
     * Migration class names must be in CamelCase format.
     * e.g: CreateUserTable or AddIndexToPostsTable.
     *
     * Single words are not allowed on their own.
     *
     * @param string $className Class Name
     * @param string $path Path
     * @return bool
     */
    public static function isUniqueMigrationClassName($className, $path)
    {
        $existingClassNames = static::getExistingMigrationClassNames($path);

return !(in_array($className, $existingClassNames));
    }

/**
     * Check if a migration/seed class name is valid.
     *
     * Migration & Seed class names must be in CamelCase format.
     * e.g: CreateUserTable, AddIndexToPostsTable or UserSeeder.
     *
     * Single words are not allowed on their own.
     *
     * @param string $className Class Name
     * @return bool
     */
    public static function isValidPhinxClassName($className)
    {
        return (bool)preg_match('/^([A-Z][a-z0-9]+)+$/', $className);
    }

/**
     * Check if a migration file name is valid.
     *
     * @param string $fileName File Name
     * @return bool
     */
    public static function isValidMigrationFileName($fileName)
    {
        $matches = [];

return preg_match(static::MIGRATION_FILE_NAME_PATTERN, $fileName, $matches);
    }

/**
     * Check if a seed file name is valid.
     *
     * @param string $fileName File Name
     * @return bool
     */
    public static function isValidSeedFileName($fileName)
    {
        $matches = [];

return preg_match(static::SEED_FILE_NAME_PATTERN, $fileName, $matches);
    }

/**
     * Expands a set of paths with curly braces (if supported by the OS).
     *
     * @param array $paths
     * @return array
     */
    public static function globAll(array $paths)
    {
        $result = [];

foreach ($paths as $path) {
            $result = array_merge($result, static::glob($path));
        }

return $result;
    }

/**
     * Expands a path with curly braces (if supported by the OS).
     *
     * @param string $path
     * @return array
     */
    public static function glob($path)
    {
        return glob($path, defined('GLOB_BRACE') ? GLOB_BRACE : 0);
    }
}