<?php

declare(strict_types=1);

namespace App\Repositories;

use Core\Repository;

/**
 * Writes and reads entries in campaign_audit.
 *
 * Action codes:
 *   I – record was inserted (created)
 *   U – record was updated (fields contains {"before":{...},"after":{...}})
 *   D – record was deleted (snapshot of the row at time of deletion)
 *   R – record was restored after a previous deletion
 */
class CampaignAuditRepository extends Repository
{
    protected string $table      = 'campaign_audit';
    protected string $primaryKey = 'audit_id';

    /**
     * Write one audit entry.
     *
     * @param array<string, mixed> $fields  Snapshot or before/after payload.
     */
    public function log(int $campaignId, string $action, array $fields, string $username): void
    {
        $this->database->execute(
            "INSERT INTO campaign_audit (id, action, fields, username)
             VALUES (:id, :action, :fields, :username)",
            [
                'id'       => $campaignId,
                'action'   => $action,
                'fields'   => json_encode($fields, JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
                'username' => $username,
            ]
        );
    }

    /**
     * All audit entries for one campaign, oldest first.
     *
     * @return list<array<string, mixed>>
     */
    public function forRecord(int $campaignId): array
    {
        return $this->database->query(
            'SELECT audit_id, id, action, fields, username, created_at
             FROM campaign_audit
             WHERE id = :id
             ORDER BY audit_id ASC',
            ['id' => $campaignId]
        );
    }

    /**
     * Most recent audit entries across all campaigns.
     *
     * @return list<array<string, mixed>>
     */
    public function recent(int $limit = 50): array
    {
        $limit = max(1, $limit);

        return $this->database->query(
            "SELECT TOP ({$limit}) audit_id, id, action, fields, username, created_at
             FROM campaign_audit
             ORDER BY audit_id DESC"
        );
    }
}