<?php

namespace App\Services\AiEditing\Safety;

use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Log;

class AiAbuseEscalationService
{
    public const REASON_CODE = 'abuse_escalation_threshold_reached';

    /**
     * @return array{type:string,count:int,threshold:int,escalated:bool,reason_code:?string}
     */
    public function recordPromptBlock(int $tenantId, int $eventId, string $scope): array
    {
        return $this->record('prompt_block', $tenantId, $eventId, $scope);
    }

    /**
     * @return array{type:string,count:int,threshold:int,escalated:bool,reason_code:?string}
     */
    public function recordOutputBlock(int $tenantId, int $eventId, string $scope): array
    {
        return $this->record('output_block', $tenantId, $eventId, $scope);
    }

    /**
     * @return array{type:string,count:int,threshold:int,escalated:bool,reason_code:?string}
     */
    private function record(string $type, int $tenantId, int $eventId, string $scope): array
    {
        $threshold = max(1, (int) config('ai-editing.abuse.escalation_threshold_per_hour', 25));
        $cooldownMinutes = max(1, (int) config('ai-editing.abuse.escalation_cooldown_minutes', 30));
        $bucket = now()->format('YmdH');

        $counterKey = sprintf('ai-editing:abuse:%s:tenant:%d:event:%d:hour:%s', $type, $tenantId, $eventId, $bucket);
        Cache::add($counterKey, 0, now()->addHours(2));
        $count = (int) Cache::increment($counterKey);

        $escalated = $count >= $threshold;
        if ($escalated) {
            $cooldownKey = sprintf('ai-editing:abuse:%s:tenant:%d:event:%d:cooldown', $type, $tenantId, $eventId);
            if (Cache::add($cooldownKey, 1, now()->addMinutes($cooldownMinutes))) {
                Log::warning('AI abuse escalation threshold reached', [
                    'tenant_id' => $tenantId,
                    'event_id' => $eventId,
                    'type' => $type,
                    'count' => $count,
                    'threshold' => $threshold,
                    'scope_hash' => hash('sha256', $scope),
                ]);
            }
        }

        return [
            'type' => $type,
            'count' => $count,
            'threshold' => $threshold,
            'escalated' => $escalated,
            'reason_code' => $escalated ? self::REASON_CODE : null,
        ];
    }
}