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<?php

declare(strict_types=1);

/**
 * This file is part of CodeIgniter 4 framework.
 *
 * (c) CodeIgniter Foundation <admin@codeigniter.com>
 *
 * For the full copyright and license information, please view
 * the LICENSE file that was distributed with this source code.
 */

namespace CodeIgniter\Config;

use CodeIgniter\Autoloader\FileLocatorInterface;
use CodeIgniter\Database\ConnectionInterface;
use CodeIgniter\Exceptions\InvalidArgumentException;
use CodeIgniter\Model;

/**
 * Factories for creating instances.
 *
 * Factories allow dynamic loading of components by their path
 * and name. The "shared instance" implementation provides a
 * large performance boost and helps keep code clean of lengthy
 * instantiation checks.
 *
 * @method static BaseConfig|null config(...$arguments)
 * @method static Model|null      models(string $alias, array $options = [], ?ConnectionInterface &$conn = null)
 * @see \CodeIgniter\Config\FactoriesTest
 */
final class Factories
{
    /**
     * Store of component-specific options, usually
     * from CodeIgniter\Config\Factory.
     *
     * @var array<string, array<string, bool|string|null>>
     */
    private static array $options = [];

/**
     * Explicit options for the Config
     * component to prevent logic loops.
     *
     * @var array<string, bool|string|null>
     */
    private static array $configOptions = [
        'component'  => 'config',
        'path'       => 'Config',
        'instanceOf' => null,
        'getShared'  => true,
        'preferApp'  => true,
    ];

/**
     * Mapping of class aliases to their true Fully Qualified Class Name (FQCN).
     *
     * Class aliases can be:
     *     - FQCN. E.g., 'App\Lib\SomeLib'
     *     - short classname. E.g., 'SomeLib'
     *     - short classname with sub-directories. E.g., 'Sub/SomeLib'
     *
     * [component => [alias => FQCN]]
     *
     * @var array<string, array<string, class-string>>
     */
    private static array $aliases = [];

/**
     * Store for instances of any component that
     * has been requested as "shared".
     *
     * A multi-dimensional array with components as
     * keys to the array of name-indexed instances.
     *
     * [component => [FQCN => instance]]
     *
     * @var array<string, array<class-string, object>>
     */
    private static array $instances = [];

/**
     * Whether the component instances are updated?
     *
     * @var array<string, true> [component => true]
     *
     * @internal For caching only
     */
    private static array $updated = [];

/**
     * Define the class to load. You can *override* the concrete class.
     *
     * @param string       $component Lowercase, plural component name
     * @param string       $alias     Class alias. See the $aliases property.
     * @param class-string $classname FQCN to be loaded
     */
    public static function define(string $component, string $alias, string $classname): void
    {
        $component = strtolower($component);

if (isset(self::$aliases[$component][$alias])) {
            if (self::$aliases[$component][$alias] === $classname) {
                return;
            }

throw new InvalidArgumentException(
                'Already defined in Factories: ' . $component . ' ' . $alias . ' -> ' . self::$aliases[$component][$alias],
            );
        }

if (! class_exists($classname)) {
            throw new InvalidArgumentException('No such class: ' . $classname);
        }

// Force a configuration to exist for this component.
        // Otherwise, getOptions() will reset the component.
        self::getOptions($component);

self::$aliases[$component][$alias] = $classname;
        self::$updated[$component]         = true;
    }

/**
     * Loads instances based on the method component name. Either
     * creates a new instance or returns an existing shared instance.
     *
     * @return object|null
     */
    public static function __callStatic(string $component, array $arguments)
    {
        $component = strtolower($component);

// First argument is the class alias, second is options
        $alias   = trim(array_shift($arguments), '\\ ');
        $options = array_shift($arguments) ?? [];

// Determine the component-specific options
        $options = array_merge(self::getOptions($component), $options);

if (! $options['getShared']) {
            if (isset(self::$aliases[$options['component']][$alias])) {
                $class = self::$aliases[$options['component']][$alias];

return new $class(...$arguments);
            }

// Try to locate the class
            $class = self::locateClass($options, $alias);
            if ($class !== null) {
                return new $class(...$arguments);
            }

return null;
        }

// Check for an existing definition
        $instance = self::getDefinedInstance($options, $alias, $arguments);
        if ($instance !== null) {
            return $instance;
        }

// Try to locate the class
        if (($class = self::locateClass($options, $alias)) === null) {
            return null;
        }

self::createInstance($options['component'], $class, $arguments);
        self::setAlias($options['component'], $alias, $class);

return self::$instances[$options['component']][$class];
    }

/**
     * Simple method to get the shared instance fast.
     */
    public static function get(string $component, string $alias): ?object
    {
        if (isset(self::$aliases[$component][$alias])) {
            $class = self::$aliases[$component][$alias];

if (isset(self::$instances[$component][$class])) {
                return self::$instances[$component][$class];
            }
        }

return self::__callStatic($component, [$alias]);
    }

/**
     * Gets the defined instance. If not exists, creates new one.
     *
     * @return object|null
     */
    private static function getDefinedInstance(array $options, string $alias, array $arguments)
    {
        // The alias is already defined.
        if (isset(self::$aliases[$options['component']][$alias])) {
            $class = self::$aliases[$options['component']][$alias];

// Need to verify if the shared instance matches the request
            if (self::verifyInstanceOf($options, $class)) {
                // Check for an existing instance
                if (isset(self::$instances[$options['component']][$class])) {
                    return self::$instances[$options['component']][$class];
                }

self::createInstance($options['component'], $class, $arguments);

return self::$instances[$options['component']][$class];
            }
        }

// Try to locate the class
        if (($class = self::locateClass($options, $alias)) === null) {
            return null;
        }

// Check for an existing instance for the class
        if (isset(self::$instances[$options['component']][$class])) {
            self::setAlias($options['component'], $alias, $class);

return self::$instances[$options['component']][$class];
        }

return null;
    }

/**
     * Creates the shared instance.
     */
    private static function createInstance(string $component, string $class, array $arguments): void
    {
        self::$instances[$component][$class] = new $class(...$arguments);
        self::$updated[$component]           = true;
    }

/**
     * Sets alias
     */
    private static function setAlias(string $component, string $alias, string $class): void
    {
        self::$aliases[$component][$alias] = $class;
        self::$updated[$component]         = true;

// If a short classname is specified, also register FQCN to share the instance.
        if (! isset(self::$aliases[$component][$class]) && ! self::isNamespaced($alias)) {
            self::$aliases[$component][$class] = $class;
        }
    }

/**
     * Is the component Config?
     *
     * @param string $component Lowercase, plural component name
     */
    private static function isConfig(string $component): bool
    {
        return $component === 'config';
    }

/**
     * Finds a component class
     *
     * @param array  $options The array of component-specific directives
     * @param string $alias   Class alias. See the $aliases property.
     */
    private static function locateClass(array $options, string $alias): ?string
    {
        // Check for low-hanging fruit
        if (
            class_exists($alias, false)
            && self::verifyPreferApp($options, $alias)
            && self::verifyInstanceOf($options, $alias)
        ) {
            return $alias;
        }

// Determine the relative class names we need
        $basename = self::getBasename($alias);
        $appname  = self::isConfig($options['component'])
            ? 'Config\\' . $basename
            : rtrim(APP_NAMESPACE, '\\') . '\\' . $options['path'] . '\\' . $basename;

// If an App version was requested then see if it verifies
        if (
            // preferApp is used only for no namespaced class.
            ! self::isNamespaced($alias)
            && $options['preferApp'] && class_exists($appname)
            && self::verifyInstanceOf($options, $alias)
        ) {
            return $appname;
        }

// If we have ruled out an App version and the class exists then try it
        if (class_exists($alias) && self::verifyInstanceOf($options, $alias)) {
            return $alias;
        }

// Have to do this the hard way...
        /** @var FileLocatorInterface */
        $locator = service('locator');

// Check if the class alias was namespaced
        if (self::isNamespaced($alias)) {
            if (! $file = $locator->locateFile($alias, $options['path'])) {
                return null;
            }
            $files = [$file];
        }
        // No namespace? Search for it
        // Check all namespaces, prioritizing App and modules
        elseif (($files = $locator->search($options['path'] . DIRECTORY_SEPARATOR . $alias)) === []) {
            return null;
        }

// Check all files for a valid class
        foreach ($files as $file) {
            $class = $locator->findQualifiedNameFromPath($file);

if ($class !== false && self::verifyInstanceOf($options, $class)) {
                return $class;
            }
        }

return null;
    }

/**
     * Is the class alias namespaced or not?
     *
     * @param string $alias Class alias. See the $aliases property.
     */
    private static function isNamespaced(string $alias): bool
    {
        return str_contains($alias, '\\');
    }

/**
     * Verifies that a class & config satisfy the "preferApp" option
     *
     * @param array  $options The array of component-specific directives
     * @param string $alias   Class alias. See the $aliases property.
     */
    private static function verifyPreferApp(array $options, string $alias): bool
    {
        // Anything without that restriction passes
        if (! $options['preferApp']) {
            return true;
        }

// Special case for Config since its App namespace is actually \Config
        if (self::isConfig($options['component'])) {
            return str_starts_with($alias, 'Config');
        }

return str_starts_with($alias, APP_NAMESPACE);
    }

/**
     * Verifies that a class & config satisfy the "instanceOf" option
     *
     * @param array  $options The array of component-specific directives
     * @param string $alias   Class alias. See the $aliases property.
     */
    private static function verifyInstanceOf(array $options, string $alias): bool
    {
        // Anything without that restriction passes
        if (! $options['instanceOf']) {
            return true;
        }

return is_a($alias, $options['instanceOf'], true);
    }

/**
     * Returns the component-specific configuration
     *
     * @param string $component Lowercase, plural component name
     *
     * @return array<string, bool|string|null>
     *
     * @internal For testing only
     * @testTag
     */
    public static function getOptions(string $component): array
    {
        $component = strtolower($component);

// Check for a stored version
        if (isset(self::$options[$component])) {
            return self::$options[$component];
        }

$values = self::isConfig($component)
            // Handle Config as a special case to prevent logic loops
            ? self::$configOptions
            // Load values from the best Factory configuration (will include Registrars)
            : config('Factory')->{$component} ?? [];

// The setOptions() reset the component. So getOptions() may reset
        // the component.
        return self::setOptions($component, $values);
    }

/**
     * Normalizes, stores, and returns the configuration for a specific component
     *
     * @param string $component Lowercase, plural component name
     * @param array  $values    option values
     *
     * @return array<string, bool|string|null> The result after applying defaults and normalization
     */
    public static function setOptions(string $component, array $values): array
    {
        $component = strtolower($component);

// Allow the config to replace the component name, to support "aliases"
        $values['component'] = strtolower($values['component'] ?? $component);

// Reset this component so instances can be rediscovered with the updated config
        self::reset($values['component']);

// If no path was available then use the component
        $values['path'] = trim($values['path'] ?? ucfirst($values['component']), '\\ ');

// Add defaults for any missing values
        $values = array_merge(Factory::$default, $values);

// Store the result to the supplied name and potential alias
        self::$options[$component]           = $values;
        self::$options[$values['component']] = $values;

return $values;
    }

/**
     * Resets the static arrays, optionally just for one component
     *
     * @param string|null $component Lowercase, plural component name
     *
     * @return void
     */
    public static function reset(?string $component = null)
    {
        if ($component !== null) {
            unset(
                self::$options[$component],
                self::$aliases[$component],
                self::$instances[$component],
                self::$updated[$component],
            );

return;
        }

self::$options   = [];
        self::$aliases   = [];
        self::$instances = [];
        self::$updated   = [];
    }

/**
     * Helper method for injecting mock instances
     *
     * @param string $component Lowercase, plural component name
     * @param string $alias     Class alias. See the $aliases property.
     *
     * @return void
     *
     * @internal For testing only
     * @testTag
     */
    public static function injectMock(string $component, string $alias, object $instance)
    {
        $component = strtolower($component);

// Force a configuration to exist for this component
        self::getOptions($component);

$class = $instance::class;

self::$instances[$component][$class] = $instance;
        self::$aliases[$component][$alias]   = $class;

if (self::isConfig($component)) {
            if (self::isNamespaced($alias)) {
                self::$aliases[$component][self::getBasename($alias)] = $class;
            } else {
                self::$aliases[$component]['Config\\' . $alias] = $class;
            }
        }
    }

/**
     * Gets a basename from a class alias, namespaced or not.
     *
     * @internal For testing only
     * @testTag
     */
    public static function getBasename(string $alias): string
    {
        // Determine the basename
        if ($basename = strrchr($alias, '\\')) {
            return substr($basename, 1);
        }

return $alias;
    }

/**
     * Gets component data for caching.
     *
     * @return array{
     *   options: array<string, bool|string|null>,
     *   aliases: array<string, class-string>,
     *   instances: array<class-string, object>,
     * }
     *
     * @internal For caching only
     */
    public static function getComponentInstances(string $component): array
    {
        if (! isset(self::$aliases[$component])) {
            return [
                'options'   => [],
                'aliases'   => [],
                'instances' => [],
            ];
        }

return [
            'options'   => self::$options[$component],
            'aliases'   => self::$aliases[$component],
            'instances' => self::$instances[$component],
        ];
    }

/**
     * Sets component data
     *
     * @internal For caching only
     */
    public static function setComponentInstances(string $component, array $data): void
    {
        self::$options[$component]   = $data['options'];
        self::$aliases[$component]   = $data['aliases'];
        self::$instances[$component] = $data['instances'];

unset(self::$updated[$component]);
    }

/**
     * Whether the component instances are updated?
     *
     * @internal For caching only
     */
    public static function isUpdated(string $component): bool
    {
        return isset(self::$updated[$component]);
    }
}

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