<?php
namespace VPSManager;
require_once __DIR__ . '/Graphite.php';

final class ClientView
{
    public static function escape($value): string
    {
        return htmlspecialchars((string) $value, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
    }

    public static function links(array $params, ?array $config = null): string
    {
        if ($config === null) {
            try { $config = Config::load(); } catch (\Throwable $e) { $config = []; }
        }
        $fields = $params['customfields'] ?? [];
        $panel = '';
        $graphs = '';
        $raw = $fields['url'] ?? '';
        if (is_string($raw) && $raw !== '') {
            // Preserve legacy host-only form, without accepting arbitrary schemes or credentials.
            if (preg_match('/\A[a-zA-Z0-9.-]+\z/', $raw)) {
                $raw = 'https://' . $raw . ':8080/login/index.php';
            }
            try { $panel = Config::url(['panel' => $raw], 'panel'); } catch (\Throwable $e) { /* Hide unsafe URL. */ }
        }
        if (($config['graphs_authorization_confirmed'] ?? false) === true
            && Graphite::validUuid($fields['uuid'] ?? null)
            && is_string($fields['vtype'] ?? null)
            && preg_match('/\A[a-z0-9_-]{1,24}\z/', $fields['vtype'])) {
            try {
                $graphs = Config::url($config, 'graphs_url') . '/collect/servidor/'
                    . rawurlencode($fields['vtype']) . '/' . rawurlencode($fields['uuid']) . '/-1h/now';
            } catch (\Throwable $e) { /* Configuration is optional. */ }
        }
        ob_start();
        require __DIR__ . '/../templates/links.php';
        return ob_get_clean();
    }

    public static function render(array $params, $requestedRange = '24h', ?Graphite $graphite = null): string
    {
        $range = Graphite::range($requestedRange);
        $config = [];
        try { $config = Config::load(); } catch (\Throwable $e) { /* Metrics fail independently. */ }
        $links = self::links($params, $config);
        if (($params['customfields']['vtype'] ?? null) !== 'lx') {
            return $links;
        }
        $metrics = null;
        try {
            $graphite = $graphite ?? new Graphite($config);
            $metrics = $graphite->getForService($params, $range);
        } catch (\Throwable $e) {
            // Do not log exceptions, configuration, raw responses or WHMCS parameters.
        }
        $serviceId = filter_var($params['serviceid'] ?? null, FILTER_VALIDATE_INT, ['options' => ['min_range' => 1]]);
        $ranges = Graphite::RANGES;
        $cards = ['load' => 'Carga del sistema', 'memory' => 'Uso de memoria', 'network' => 'Tráfico de red'];
        $json = $metrics === null ? '' : json_encode($metrics, JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_THROW_ON_ERROR);
        ob_start();
        require __DIR__ . '/../templates/metrics.php';
        return ob_get_clean();
    }
}