<?php

namespace App\Services\Incentive;

use App\Models\Incentive;
use App\Models\IncentiveParticipant;
use Illuminate\Support\Facades\Log;

class IncentiveCalculationService
{
    /**
     * Full recalculation of an incentive (batch / cron / manual).
     * Normal: Neuberechnung aus Tracking-Tabellen + Log.
     * Force: Kompletter Neuaufbau aus Quelldaten (Users, UserAbos, UserSalesVolumes).
     */
    public function recalculate(Incentive $incentive, bool $force = false): array
    {
        $stats = ['participants' => 0, 'errors' => 0];

        $participants = $incentive->participants()->with('user')->get();

        foreach ($participants as $participant) {
            try {
                $this->recalculateParticipant($participant, $force);
                $stats['participants']++;
            } catch (\Throwable $e) {
                $stats['errors']++;
                Log::error('IncentiveCalculation error for participant '.$participant->id.': '.$e->getMessage());
            }
        }

        IncentiveTracker::updateRanking($incentive);

        return $stats;
    }

    /**
     * Recalculate a single participant.
     * Force: Kompletter Neuaufbau aus Quelldaten.
     * Normal: Neuberechnung aus vorhandenen Tracking-Tabellen + Log.
     */
    public function recalculateParticipant(IncentiveParticipant $participant, bool $force = false): void
    {
        if (! $participant->user) {
            return;
        }

        if ($force) {
            $participant->rebuildFromSourceTables()->save();
        } else {
            $participant->recalculateFromTrackingTables()->save();
        }
    }
}