<?php

declare(strict_types=1);

use Contractless\Api\ApplicationFactory;
use Contractless\Api\Http\ExceptionResponder;
use Contractless\Api\Http\JsonResponse;
use Contractless\Api\Http\HttpException;
use Contractless\Api\Http\Request;
use Contractless\Api\Http\RequestContext;
use Contractless\Api\Http\Router;
use Contractless\Api\Rpc\RpcReplyDecoder;
use Contractless\Api\Rpc\RequestCredentials;
use Contractless\Api\Nft\NftMediaService;
use Contractless\Api\Routes\NftMediaRoutes;
use Contractless\Api\Routes\RemainingRoutes;
use Contractless\Api\Security\SecurityMiddleware;
use Contractless\Api\Security\TransactionPolicy;
use Contractless\Rpc\Crypto\NativeCrypto;

$projectRoot = dirname(__DIR__);
$autoload = $projectRoot . '/vendor/autoload.php';

if (!is_file($autoload)) {
    http_response_code(500);
    header('Content-Type: application/json; charset=utf-8');
    echo '{"success":false,"error":"API dependencies are not installed."}';
    exit;
}

require $autoload;

RequestContext::initialize();

try {
    $config = ApplicationFactory::configuration($projectRoot);
    $method = strtoupper($_SERVER['REQUEST_METHOD'] ?? 'GET');
    $path = parse_url($_SERVER['REQUEST_URI'] ?? '/', PHP_URL_PATH);
    $path = is_string($path) ? '/' . trim($path, '/') : '/';
    if ($path === '/') {
        $path = '/';
    }

    // General HTTP security runs before wallet authentication or RPC creation.
    (new SecurityMiddleware($config))->handle($method, $path);
    if ($method === 'GET' && $path === '/api/v1/live') {
        JsonResponse::success(['alive' => true]);
    }
    $requestCredentials = RequestCredentials::fromHeaders(new NativeCrypto());
    $application = ApplicationFactory::createFromConfig(
        $config,
        $requestCredentials->handshakeProof,
    );

    $router = new Router();
    $router->get('/api/v1', static function () use ($application): never {
        JsonResponse::success([
            'name' => 'Contractless PHP API',
            'version' => 'v1',
            'rpc_endpoints' => count($application->transport->endpointIds()),
        ]);
    });
    $router->get('/api/v1/health', static function () use ($application): never {
        $height = RpcReplyDecoder::unsigned32(
            $application->client->blockHeight(),
            'block height',
        );
        JsonResponse::success(['online' => true, 'height' => $height]);
    });
    $router->get('/api/v1/ready', static function () use ($application): never {
        $height = RpcReplyDecoder::unsigned32(
            $application->client->blockHeight(),
            'block height',
        );
        JsonResponse::success([
            'ready' => true,
            'height' => $height,
            'rpc_endpoints' => $application->endpointHealth->status(
                $application->transport->endpointIds(),
            ),
        ]);
    });
    $router->get('/api/v1/network', static function () use ($application): never {
        JsonResponse::success(
            RpcReplyDecoder::networkInfo($application->client->networkInfo()),
        );
    });
    $router->get('/api/v1/height', static function () use ($application): never {
        JsonResponse::success([
            'height' => RpcReplyDecoder::unsigned32(
                $application->client->blockHeight(),
                'block height',
            ),
        ]);
    });
    $router->get('/api/v1/time', static function () use ($application): never {
        JsonResponse::success([
            'timestamp' => RpcReplyDecoder::unsigned32(
                $application->client->nodeTime(),
                'node time',
            ),
        ]);
    });
    $router->get('/api/v1/addresses/validate', static function () use ($application): never {
        $address = Request::canonicalAddress(Request::queryString('address', 45));
        JsonResponse::success([
            'address' => $address,
            'valid' => RpcReplyDecoder::validStatus(
                $application->client->validateAddress($address),
            ),
        ]);
    });
    $router->get('/api/v1/addresses/vanity/resolve', static function () use ($application): never {
        $address = strtolower(Request::queryString('address', 25));
        if (preg_match('/^([a-z]{1,20})\.(clc|cltc)$/', $address, $matches) !== 1) {
            throw new HttpException(422, 'Enter a valid Contractless vanity address.');
        }
        $fixedWidthAddress = str_pad($matches[1], 20, ' ', STR_PAD_LEFT)
            . '.'
            . $matches[2];
        JsonResponse::success([
            'vanity_address' => $address,
            'owner_address' => RpcReplyDecoder::optionalText(
                $application->client->vanityOwner($fixedWidthAddress),
            ),
        ]);
    });
    $router->get('/api/v1/addresses/registration', static function () use ($application): never {
        $address = Request::canonicalAddress(Request::queryString('address', 45));
        JsonResponse::success([
            'address' => $address,
            'registered' => RpcReplyDecoder::registrationStatus(
                $application->client->walletRegistrationStatus($address),
            ),
        ]);
    });
    $router->post(
        '/api/v1/addresses/register',
        static function () use ($application, $requestCredentials): never {
            $body = Request::json();
            $address = Request::canonicalAddress(
                Request::bodyString($body, 'address', 45),
            );
            $publicKeyHex = strtolower(
                Request::bodyString($body, 'public_key', 1_794),
            );
            $signature = Request::signature(
                Request::bodyString($body, 'signature', 1_332),
            );

            if (
                strlen($publicKeyHex) !== 1_794
                || !ctype_xdigit($publicKeyHex)
            ) {
                throw new HttpException(
                    422,
                    'The public key must contain 1,794 hexadecimal characters.',
                );
            }
            if (!hash_equals($requestCredentials->address, $address)) {
                throw new HttpException(
                    403,
                    'A wallet may only submit its own registration.',
                );
            }

            $publicKey = hex2bin($publicKeyHex);
            if (
                $publicKey === false
                || !hash_equals(
                    $requestCredentials->handshakeProof->publicKey,
                    $publicKey,
                )
            ) {
                throw new HttpException(
                    403,
                    'The registration public key does not match the authenticated wallet.',
                );
            }

            JsonResponse::success([
                'address' => $address,
                'registered' => RpcReplyDecoder::registrationStatus(
                    $application->client->registerWallet(
                        $address,
                        $publicKey,
                        $signature,
                    ),
                ),
            ]);
        },
    );
    $router->get('/api/v1/balances/base', static function () use ($application): never {
        $address = Request::canonicalAddress(Request::queryString('address', 45));
        $coin = strtoupper(Request::queryString('coin', 15));
        $expectedCoin = str_ends_with($address, '.cltc') ? 'CLTC' : 'CLC';
        if ($coin !== $expectedCoin) {
            throw new HttpException(
                422,
                "Base coin must be $expectedCoin for this address.",
            );
        }
        JsonResponse::success([
            'address' => $address,
            'coin' => $coin,
            'balance' => RpcReplyDecoder::balance(
                $application->client->coinBalance($coin, $address),
            ),
        ]);
    });
    $router->get('/api/v1/balances', static function () use ($application): never {
        $address = Request::canonicalAddress(Request::queryString('address', 45));
        JsonResponse::success([
            'address' => $address,
            'balances' => RpcReplyDecoder::balances(
                $application->client->totalBalance($address),
            ),
        ]);
    });
    $router->get('/api/v1/transactions/lookup', static function () use ($application): never {
        $txid = Request::hash(Request::queryString('txid', 64), 'txid');
        JsonResponse::success([
            'txid' => $txid,
        ] + RpcReplyDecoder::transaction(
            $application->client->transactionById($txid),
        ));
    });
    $router->get('/api/v1/addresses/history', static function () use ($application): never {
        $address = Request::canonicalAddress(Request::queryString('address', 45));
        $skip = Request::queryInt('skip', 0, 0, 4_294_967_295);
        $limit = Request::queryInt('limit', 100, 1, 1_000);
        JsonResponse::success([
            'address' => $address,
            'skip' => $skip,
            'limit' => $limit,
            'transactions' => RpcReplyDecoder::addressHistory(
                $application->client->addressHistory($address, $skip, $limit),
            ),
        ]);
    });
    $router->post('/api/v1/messages/verify', static function () use ($application): never {
        $body = Request::json();
        // Message bytes must remain exactly as signed, including surrounding whitespace.
        $message = Request::bodyString($body, 'message', 65_535, trim: false);
        $address = Request::canonicalAddress(
            Request::bodyString($body, 'address', 45),
        );
        $signature = Request::signature(
            Request::bodyString($body, 'signature', 1_332),
        );
        JsonResponse::success([
            'valid' => RpcReplyDecoder::validStatus(
                $application->client->validateMessage($message, $address, $signature),
            ),
        ]);
    });
    $router->post('/api/v1/transactions/broadcast', static function () use ($application): never {
        $body = Request::json();
        $transaction = Request::transactionHex(
            Request::bodyString($body, 'transaction_hex', 1_900_000),
        );
        $transactionType = TransactionPolicy::validate($transaction);
        JsonResponse::success(
            ['transaction_type' => $transactionType] + RpcReplyDecoder::broadcast(
                $application->client->submitTransaction($transaction),
            ),
        );
    });

    RemainingRoutes::register($router, $application);
    NftMediaRoutes::register(
        $router,
        $application,
        new NftMediaService($config->nftMedia),
    );
    $router->dispatch($method, $path);
} catch (Throwable $error) {
    ExceptionResponder::respond($error);
}