<?php

namespace App\Core;

/**
 * NovaCore Dependency Injection Container
 * Simple service container
 */
class Container
{
    private array $services = [];
    private array $singletons = [];

    /**
     * Register a service
     */
    public function bind(string $name, callable $factory): void
    {
        $this->services[$name] = $factory;
    }

    /**
     * Register a singleton service
     */
    public function singleton(string $name, callable $factory): void
    {
        $this->singletons[$name] = $factory;
    }

    /**
     * Get a service instance
     */
    public function get(string $name)
    {
        // Check singletons first
        if (isset($this->singletons[$name])) {
            if (!isset($this->services[$name])) {
                $this->services[$name] = $this->singletons[$name]();
            }
            return $this->services[$name];
        }

        // Check regular services
        if (isset($this->services[$name])) {
            if (is_callable($this->services[$name])) {
                return $this->services[$name]();
            }
            return $this->services[$name];
        }

        // Try to auto-resolve
        if (class_exists($name)) {
            return $this->resolve($name);
        }

        throw new \Exception("Service '{$name}' not found in container");
    }

    /**
     * Auto-resolve class dependencies
     */
    public function resolve(string $className)
    {
        $reflection = new \ReflectionClass($className);

        if (!$reflection->isInstantiable()) {
            throw new \Exception("Class '{$className}' is not instantiable");
        }

        $constructor = $reflection->getConstructor();

        if (!$constructor) {
            return new $className();
        }

        $parameters = $constructor->getParameters();
        $dependencies = [];

        foreach ($parameters as $parameter) {
            $type = $parameter->getType();

            if ($type && !$type->isBuiltin()) {
                $dependencies[] = $this->resolve($type->getName());
            } elseif ($parameter->isDefaultValueAvailable()) {
                $dependencies[] = $parameter->getDefaultValue();
            } else {
                throw new \Exception("Cannot resolve parameter '{$parameter->getName()}' for class '{$className}'");
            }
        }

        return $reflection->newInstanceArgs($dependencies);
    }

    /**
     * Inject dependencies into an object
     */
    public function inject(object $object): void
    {
        $reflection = new \ReflectionClass($object);
        $properties = $reflection->getProperties();

        foreach ($properties as $property) {
            if ($property->isPublic() && !$property->isInitialized($object)) {
                $type = $property->getType();

                if ($type && !$type->isBuiltin()) {
                    $property->setValue($object, $this->get($type->getName()));
                }
            }
        }
    }

    /**
     * Check if service exists
     */
    public function has(string $name): bool
    {
        return isset($this->services[$name]) || isset($this->singletons[$name]);
    }

    /**
     * Get all services
     */
    public function getServices(): array
    {
        return array_merge($this->services, $this->singletons);
    }
}