<?php

namespace Controllers;

use Libs\BashExecutor;
use Libs\ResponseLib;
use Models\CprModel;
use Models\StatusModel;
use Psr\Http\Message\ServerRequestInterface;
use Respect\Validation\Exceptions\ValidationException;
use Respect\Validation\Validator as val;
use Services\PaymentService;

class RegisterCprController
{
    private CprModel $cprModel;
    private StatusModel $statusModel;
    private PaymentService $paymentService;

    private const PIX_VALUE = '1000.00';

    public function __construct()
    {
        $this->cprModel = new CprModel();
        $this->statusModel = new StatusModel();
        $this->paymentService = new PaymentService();
    }

    public function __invoke(ServerRequestInterface $request)
    {
        $body = json_decode((string)$request->getBody(), true) ?? [];

        try {
            val::key('cpr_children_codes', val::arrayType()->notEmpty()->each(val::stringType()->notEmpty()))
                ->assert($body);
        } catch (ValidationException $e) {
            return ResponseLib::sendFail(
                'Validation failed: ' . $e->getFullMessage(),
                [],
                'E_VALIDATE'
            )->withStatus(400);
        }

        $userId = (int)($request->getAttribute('api_user_id') ?? 0);
        if ($userId <= 0) {
            return ResponseLib::sendFail('Authenticated user not found', [], 'E_VALIDATE')->withStatus(401);
        }

        $statusId = $this->statusModel->getIdByStatus('pending');
        if ($statusId === null) {
            return ResponseLib::sendFail('Pending status not found', [], 'E_DATABASE')->withStatus(500);
        }

        try {
            $pixData = $this->generateDynamicQrcode();
        } catch (\Throwable $e) {
            return ResponseLib::sendFail('Failed to generate PIX QR Code: ' . $e->getMessage(), [], 'E_INTERNAL')->withStatus(500);
        }

        try {
            $paymentId = $this->paymentService->createPendingPayment($pixData['item_id'], $statusId, $userId);
        } catch (\Throwable $e) {
            return ResponseLib::sendFail('Failed to create payment record: ' . $e->getMessage(), [], 'E_DATABASE')->withStatus(500);
        }

        try {
            $record = $this->cprModel->create($body, $statusId, $paymentId);
        } catch (\InvalidArgumentException $e) {
            return ResponseLib::sendFail($e->getMessage(), [], 'E_VALIDATE')->withStatus(400);
        } catch (\Throwable $e) {
            return ResponseLib::sendFail('Failed to create CPR: ' . $e->getMessage(), [], 'E_DATABASE')->withStatus(500);
        }

        return ResponseLib::sendOk([
            'cpr' => $record,
            'pix' => [
                'qrcode_url' => $pixData['qrcode_url'],
            ]
        ], 'S_CREATED');
    }

    private function generateDynamicQrcode(): array
    {
        $cliPath = dirname(__DIR__) . '/bin/genial-cli';
        if (!is_file($cliPath) || !is_executable($cliPath)) {
            throw new \RuntimeException('genial-cli executable not found or not executable');
        }

        $amount = self::PIX_VALUE;
        $command = sprintf('%s qrcodedynamic %s', escapeshellarg($cliPath), escapeshellarg($amount));
        $result = BashExecutor::run($command, 60);

        if (($result['exitCode'] ?? 1) !== 0) {
            $this->logCliResult($result, 'genial-cli non-zero exit');
            $message = $result['error'] ?: $result['output'] ?: 'Unknown error';
            throw new \RuntimeException($message);
        }

        $output = $result['output'] ?? '';

        try {
            $parsed = $this->decodeCliOutput($output);
        } catch (\Throwable $e) {
            $this->logCliResult($result, 'genial-cli parse failure');
            throw $e;
        }

        $items = $parsed['data']['items'] ?? null;
        if (!is_array($items) || empty($items) || !is_array($items[0])) {
            throw new \RuntimeException('genial-cli output is missing items array');
        }

        $firstItem = $items[0];
        $itemId = $firstItem['itemId'] ?? null;
        $qrcodeUrl = $firstItem['data']['qrcodeURL'] ?? null;

        if (!$itemId || !$qrcodeUrl) {
            throw new \RuntimeException('Unable to parse itemId or qrcodeURL from genial-cli output');
        }

        return [
            'item_id' => $itemId,
            'qrcode_url' => $qrcodeUrl,
        ];
    }

    private function decodeCliOutput(string $content): array
    {
        $clean = trim($content);
        if ($clean === '') {
            throw new \RuntimeException('genial-cli returned empty output');
        }

        $decoded = json_decode($clean, true);
        if (json_last_error() === JSON_ERROR_NONE) {
            return $decoded;
        }

        $normalized = $this->normalizeCliOutput($clean);
        $decoded = json_decode($normalized, true);
        if (json_last_error() !== JSON_ERROR_NONE) {
            throw new \RuntimeException('Failed to decode genial-cli output: ' . json_last_error_msg());
        }

        return $decoded;
    }

    private function normalizeCliOutput(string $content): string
    {
        // Strip ANSI escape codes, just in case
        $normalized = preg_replace('/\e\[[\d;]*m/', '', $content);

        // Convert single-quoted strings to JSON-compatible double-quoted ones
        $normalized = preg_replace_callback(
            "/'([^'\\\\]*(?:\\\\.[^'\\\\]*)*)'/",
            static function (array $matches): string {
                $inner = str_replace(['\\', '"'], ['\\\\', '\\"'], $matches[1]);
                return '"' . $inner . '"';
            },
            $normalized
        );

        // Quote object keys so json_decode can understand them
        $normalized = preg_replace(
            '/(?<=\{|\[|,|\n)\s*([A-Za-z_][A-Za-z0-9_]*)\s*:/',
            '"$1":',
            $normalized
        );

        return $normalized;
    }

    private function logCliResult(array $result, string $context): void
    {
        $exitCode = $result['exitCode'] ?? 'null';
        $stdout = trim($result['output'] ?? '');
        $stderr = trim($result['error'] ?? '');

        error_log(sprintf(
            '[RegisterCprController] %s | exitCode: %s | stdout: %s | stderr: %s',
            $context,
            (string)$exitCode,
            $stdout === '' ? '<empty>' : $stdout,
            $stderr === '' ? '<empty>' : $stderr
        ));
    }
}