<?php

namespace App\Services\Qms;

use App\Models\DisplayScreen;
use App\Models\ServiceQueue;
use App\Models\Ticket;

class DisplayService
{
    public function findByToken(string $token): ?DisplayScreen
    {
        return DisplayScreen::query()
            ->where('access_token', $token)
            ->where('is_active', true)
            ->first();
    }

    public function touch(DisplayScreen $screen): void
    {
        $screen->update(['last_seen_at' => now()]);
    }

    /**
     * @return array<string, mixed>
     */
    public function payload(DisplayScreen $screen): array
    {
        $queueIds = $screen->service_queue_ids ?? [];
        $queues = ServiceQueue::query()
            ->whereIn('id', $queueIds)
            ->where('is_active', true)
            ->get();

        $nowServing = Ticket::query()
            ->whereIn('service_queue_id', $queueIds)
            ->whereIn('status', ['called', 'serving'])
            ->with(['counter', 'serviceQueue'])
            ->orderByDesc('called_at')
            ->limit(5)
            ->get()
            ->map(fn (Ticket $t) => [
                'ticket_number' => $t->ticket_number,
                'queue_name' => $t->serviceQueue?->name,
                'counter' => $t->counter?->name,
            ]);

        $waiting = Ticket::query()
            ->whereIn('service_queue_id', $queueIds)
            ->where('status', 'waiting')
            ->count();

        $avgWait = (int) Ticket::query()
            ->whereIn('service_queue_id', $queueIds)
            ->where('status', 'completed')
            ->whereDate('issued_at', today())
            ->whereNotNull('called_at')
            ->selectRaw('AVG(TIMESTAMPDIFF(SECOND, issued_at, called_at)) as avg_wait')
            ->value('avg_wait');

        return [
            'screen' => [
                'name' => $screen->name,
                'layout' => $screen->layout,
            ],
            'now_serving' => $nowServing,
            'waiting_count' => $waiting,
            'estimated_wait_minutes' => $avgWait > 0 ? (int) ceil($avgWait / 60) : null,
            'queues' => $queues->map(fn (ServiceQueue $q) => [
                'name' => $q->name,
                'prefix' => $q->prefix,
                'is_paused' => $q->is_paused,
            ]),
            'announcements' => app(VoiceAnnouncementService::class)->pendingForBranch((int) $screen->branch_id),
            'updated_at' => now()->toIso8601String(),
        ];
    }
}