<?php

declare(strict_types=1);

namespace App\Observers;

use App\Events\DashboardStatsUpdated;
use App\Events\InvoiceStatusChanged;
use App\Models\Invoicing\Invoice;
use App\Services\CacheService;
use App\Services\DashboardService;
use App\Services\Events\EventDispatcher;

class InvoiceObserver
{
    public function __construct(
        private CacheService $cache,
        private EventDispatcher $eventDispatcher,
    ) {}

    /**
     * Handle the Invoice "created" event.
     */
    public function created(Invoice $invoice): void
    {
        $this->invalidateCache($invoice);
        $this->broadcastDashboardStats();
    }

    /**
     * Handle the Invoice "updated" event.
     */
    public function updated(Invoice $invoice): void
    {
        $this->invalidateCache($invoice);

        // Broadcast status change if status was updated
        if ($invoice->wasChanged('status')) {
            $previousStatus = $invoice->getOriginal('status');
            $this->eventDispatcher->dispatch(new InvoiceStatusChanged(
                $invoice,
                $previousStatus instanceof \App\Enums\InvoiceStatus ? $previousStatus->value : (string) $previousStatus,
                auth()->id()
            ));
        }

        $this->broadcastDashboardStats();
    }

    /**
     * Handle the Invoice "deleted" event.
     */
    public function deleted(Invoice $invoice): void
    {
        $this->invalidateCache($invoice);
        $this->broadcastDashboardStats();
    }

    /**
     * Handle the Invoice "restored" event.
     */
    public function restored(Invoice $invoice): void
    {
        $this->invalidateCache($invoice);
        $this->broadcastDashboardStats();
    }

    /**
     * Handle the Invoice "force deleted" event.
     */
    public function forceDeleted(Invoice $invoice): void
    {
        $this->invalidateCache($invoice);
        $this->broadcastDashboardStats();
    }

    /**
     * Invalidate related cache entries.
     */
    protected function invalidateCache(Invoice $invoice): void
    {
        $this->cache->invalidateDashboard();
        $this->cache->invalidateClient($invoice->client_id);
    }

    /**
     * Broadcast updated dashboard stats to admin users.
     */
    protected function broadcastDashboardStats(): void
    {
        try {
            $stats = app(DashboardService::class)->getStats();
            $this->eventDispatcher->dispatch(new DashboardStatsUpdated($stats));
        } catch (\Throwable) {
            // Ignore broadcast failures
        }
    }
}