<?php

namespace Modules\Maintenance\Services;

use App\Business;
use Illuminate\Support\Facades\Schema;
use Modules\Maintenance\Models\Equipment;
use Modules\Maintenance\Models\FailureReport;
use Modules\Maintenance\Models\InspectionVisit;

class EquipmentHealthScoreService
{
    public function recalculate(Business $business, Equipment $equipment): float
    {
        $score = (float) ($equipment->health_percentage ?? 100);

        if (Schema::hasTable('maintenance_inspection_visits')) {
            $lastVisit = InspectionVisit::where('business_id', $business->id)
                ->where('equipment_id', $equipment->id)
                ->whereNotNull('health_percentage')
                ->orderByDesc('visit_date')
                ->value('health_percentage');

            if ($lastVisit !== null) {
                $score = ((float) $lastVisit * 0.6) + ($score * 0.4);
            }
        }

        if (Schema::hasTable('maintenance_failure_reports')) {
            $recentFailures = FailureReport::where('business_id', $business->id)
                ->where('equipment_id', $equipment->id)
                ->where('created_at', '>=', now()->subMonths(6))
                ->count();

            $score -= min(30, $recentFailures * 5);
        }

        if ($equipment->warranty_expires_at && $equipment->warranty_expires_at->isPast()) {
            $score -= 5;
        }

        $score = max(0, min(100, round($score, 2)));
        $equipment->update(['health_percentage' => $score]);

        return $score;
    }

    public function recalculateAll(Business $business): int
    {
        $count = 0;
        Equipment::where('business_id', $business->id)->chunkById(50, function ($items) use ($business, &$count) {
            foreach ($items as $equipment) {
                $this->recalculate($business, $equipment);
                $count++;
            }
        });

        return $count;
    }
}