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<?php

declare(strict_types=1);

namespace Laravel\Mcp;

use Illuminate\Container\Container;
use Illuminate\Support\Str;
use Laravel\Mcp\Events\SessionInitialized;
use Laravel\Mcp\Server\Attributes\Instructions;
use Laravel\Mcp\Server\Attributes\Name;
use Laravel\Mcp\Server\Attributes\Version;
use Laravel\Mcp\Server\Concerns\ReadsAttributes;
use Laravel\Mcp\Server\Contracts\Method;
use Laravel\Mcp\Server\Contracts\Transport;
use Laravel\Mcp\Server\Exceptions\JsonRpcException;
use Laravel\Mcp\Server\Methods\CallTool;
use Laravel\Mcp\Server\Methods\CompletionComplete;
use Laravel\Mcp\Server\Methods\GetPrompt;
use Laravel\Mcp\Server\Methods\Initialize;
use Laravel\Mcp\Server\Methods\ListPrompts;
use Laravel\Mcp\Server\Methods\ListResources;
use Laravel\Mcp\Server\Methods\ListResourceTemplates;
use Laravel\Mcp\Server\Methods\ListTools;
use Laravel\Mcp\Server\Methods\Ping;
use Laravel\Mcp\Server\Methods\ReadResource;
use Laravel\Mcp\Server\Prompt;
use Laravel\Mcp\Server\Resource;
use Laravel\Mcp\Server\ServerContext;
use Laravel\Mcp\Server\Testing\PendingTestResponse;
use Laravel\Mcp\Server\Testing\TestResponse;
use Laravel\Mcp\Server\Tool;
use Laravel\Mcp\Server\Transport\JsonRpcNotification;
use Laravel\Mcp\Server\Transport\JsonRpcRequest;
use Laravel\Mcp\Server\Transport\JsonRpcResponse;
use stdClass;
use Throwable;

/**
 * @mixin PendingTestResponse
 */
abstract class Server
{
    use ReadsAttributes;

public const CAPABILITY_TOOLS = 'tools';

public const CAPABILITY_RESOURCES = 'resources';

public const CAPABILITY_PROMPTS = 'prompts';

public const CAPABILITY_COMPLETIONS = 'completions';

protected string $name = 'Laravel MCP Server';

protected string $version = '0.0.1';

protected string $instructions = <<<'MARKDOWN'
        This MCP server lets AI agents interact with our Laravel application.
    MARKDOWN;

/**
     * @var array<int, string>
     */
    protected array $supportedProtocolVersion = [
        '2025-11-25',
        '2025-06-18',
        '2025-03-26',
        '2024-11-05',
    ];

/**
     * @var array<string, array<string, bool>|stdClass|string>
     */
    protected array $capabilities = [
        self::CAPABILITY_TOOLS => [
            'listChanged' => false,
        ],
        self::CAPABILITY_RESOURCES => [
            'listChanged' => false,
        ],
        self::CAPABILITY_PROMPTS => [
            'listChanged' => false,
        ],
    ];

/**
     * @var array<int, Tool|class-string<Tool>>
     */
    protected array $tools = [];

/**
     * @var array<int, Resource|class-string<Resource>>
     */
    protected array $resources = [];

/**
     * @var array<int, Prompt|class-string<Prompt>>
     */
    protected array $prompts = [];

public int $maxPaginationLength = 50;

public int $defaultPaginationLength = 15;

/**
     * @var array<string, class-string<Method>>
     */
    protected array $methods = [
        'tools/list' => ListTools::class,
        'tools/call' => CallTool::class,
        'resources/list' => ListResources::class,
        'resources/read' => ReadResource::class,
        'resources/templates/list' => ListResourceTemplates::class,
        'prompts/list' => ListPrompts::class,
        'prompts/get' => GetPrompt::class,
        'completion/complete' => CompletionComplete::class,
        'ping' => Ping::class,
    ];

public function __construct(
        protected Transport $transport,
    ) {
        //
    }

/**
     * Add or modify a server capability.
     *
     * Using dot notation like "feature.enabled" will create a nested capability array.
     * Passing a single key like "anotherFeature" will register an empty object capability.
     */
    public function addCapability(string $key, bool $value = true): void
    {
        if (str_contains($key, '.')) {
            [$root, $child] = explode('.', $key, 2);
            $existing = $this->capabilities[$root] ?? [];

if (! is_array($existing)) {
                $existing = [];
            }

$existing[$child] = $value;
            $this->capabilities[$root] = $existing;

return;
        }

// Represent empty capability as an object when JSON encoded
        $this->capabilities[$key] = (object) [];
    }

/**
     * Register a custom JSON-RPC method handler.
     *
     * @param  class-string<Method>  $handler
     */
    public function addMethod(string $method, string $handler): void
    {
        $this->methods[$method] = $handler;
    }

public function start(): void
    {
        $this->boot();

$this->transport->onReceive($this->handle(...));
    }

protected function boot(): void
    {
        //
    }

public function handle(string $rawMessage): void
    {
        $context = $this->createContext();

try {
            $jsonRequest = json_decode($rawMessage, true);

if (json_last_error() !== JSON_ERROR_NONE) {
                throw new JsonRpcException('Parse error: Invalid JSON was received by the server.', -32700);
            }

$request = isset($jsonRequest['id'])
                ? JsonRpcRequest::from($jsonRequest, $this->transport->sessionId())
                : JsonRpcNotification::from($jsonRequest);

if ($request instanceof JsonRpcNotification) {
                return;
            }

if ($request->method === 'initialize') {
                $this->handleInitializeMessage($request, $context);

return;
            }

if (! isset($this->methods[$request->method])) {
                throw new JsonRpcException(
                    "The method [{$request->method}] was not found.",
                    -32601,
                    $request->id,
                );
            }

$this->handleMessage($request, $context);
        } catch (JsonRpcException $e) {
            $this->transport->send($e->toJsonRpcResponse()->toJson());
        } catch (Throwable $e) {
            report($e);

$config = Container::getInstance()->make('config');

if ($config->get('app.debug', false)) {
                throw $e;
            }

$jsonRpcResponse = JsonRpcResponse::error(
                $request->id ?? null,
                -32603,
                'Something went wrong while processing the request.',
            );

$this->transport->send($jsonRpcResponse->toJson());
        }
    }

public function createContext(): ServerContext
    {
        $name = $this->resolveAttribute(Name::class);
        $version = $this->resolveAttribute(Version::class);
        $instructions = $this->resolveAttribute(Instructions::class);

return new ServerContext(
            supportedProtocolVersions: $this->supportedProtocolVersion,
            serverCapabilities: $this->capabilities,
            serverName: $name !== null ? $name->value : $this->name,
            serverVersion: $version !== null ? $version->value : $this->version,
            instructions: $instructions !== null ? $instructions->value : $this->instructions,
            maxPaginationLength: $this->maxPaginationLength,
            defaultPaginationLength: $this->defaultPaginationLength,
            tools: $this->tools,
            resources: $this->resources,
            prompts: $this->prompts,
        );
    }

/**
     * @throws JsonRpcException
     */
    protected function handleMessage(JsonRpcRequest $request, ServerContext $context): void
    {
        $response = $this->runMethodHandle($request, $context);

if (! is_iterable($response)) {
            $this->transport->send($response->toJson());

return;
        }

$this->transport->stream(function () use ($response): void {
            foreach ($response as $message) {
                $this->transport->send($message->toJson());
            }
        });
    }

/**
     * @return iterable<JsonRpcResponse>|JsonRpcResponse
     *
     * @throws JsonRpcException
     */
    protected function runMethodHandle(JsonRpcRequest $request, ServerContext $context): iterable|JsonRpcResponse
    {
        $container = Container::getInstance();

/** @var Method $methodClass */
        $methodClass = $container->make(
            $this->methods[$request->method],
        );

$container->instance('mcp.request', $request->toRequest());

try {
            $response = $methodClass->handle($request, $context);
        } finally {
            $container->forgetInstance('mcp.request');
        }

return $response;
    }

protected function handleInitializeMessage(JsonRpcRequest $request, ServerContext $context): void
    {
        $response = (new Initialize)->handle($request, $context);

$sessionId = $this->generateSessionId();

Container::getInstance()->make('events')->dispatch(new SessionInitialized(
            sessionId: $sessionId,
            clientInfo: $request->params['clientInfo'] ?? null,
            protocolVersion: $request->params['protocolVersion'] ?? null,
            clientCapabilities: $request->params['capabilities'] ?? null,
        ));

$this->transport->send($response->toJson(), $sessionId);
    }

protected function generateSessionId(): string
    {
        return Str::uuid()->toString();
    }

/**
     * @param  array<array-key, mixed>  $arguments
     */
    public static function __callStatic(string $name, array $arguments): PendingTestResponse|TestResponse
    {
        $pendingTestResponse = new PendingTestResponse(
            Container::getInstance(),
            static::class,
        );

return $pendingTestResponse->$name(...$arguments);
    }
}

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