<?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
    {
        $screen->loadMissing(['branch', 'organization']);
        $queueIds = $this->resolveQueueIds($screen);
        $queues = ServiceQueue::query()
            ->whereIn('id', $queueIds)
            ->where('is_active', true)
            ->orderBy('name')
            ->get();

        // One active ticket per destination (service point / counter). Older called/serving
        // tickets at the same window must not crowd the public board.
        $nowServing = Ticket::query()
            ->whereIn('service_queue_id', $queueIds)
            ->whereIn('status', ['called', 'serving'])
            ->with(['counter', 'assignedCounter', 'serviceQueue'])
            ->orderByDesc('called_at')
            ->limit(48)
            ->get()
            ->unique(fn (Ticket $t) => $t->counter_id
                ? 'counter:'.$t->counter_id
                : ($t->assigned_counter_id
                    ? 'assigned:'.$t->assigned_counter_id
                    : 'queue:'.$t->service_queue_id))
            ->take(12)
            ->values()
            ->map(function (Ticket $t) {
                $point = $t->counter ?? $t->assignedCounter;

                return [
                    'ticket_number' => $t->ticket_number,
                    'queue_name' => $t->serviceQueue?->name,
                    'department' => $t->serviceQueue?->name,
                    'counter' => $point?->displayDestination() ?? $point?->name,
                    'destination' => $point?->displayDestination(),
                    'staff_display_name' => $point?->staff_display_name,
                    'announcement_text' => TicketPresenter::announcementText($t, $point),
                ];
            })
            ->all();

        $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')
            ->get(['issued_at', 'called_at'])
            ->avg(fn (Ticket $t) => $t->called_at->diffInSeconds($t->issued_at));

        return [
            'screen' => [
                'name' => $screen->name,
                'layout' => $screen->layout,
                'branch_name' => $screen->branch?->name,
                'organization_name' => $screen->organization?->name,
            ],
            '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' => (bool) $q->is_paused,
            ])->values()->all(),
            'announcements' => app(VoiceAnnouncementService::class)->pendingForBranch(
                (int) $screen->branch_id,
                $queueIds,
            ),
            'updated_at' => now()->toIso8601String(),
        ];
    }

    /**
     * @return list<int>
     */
    protected function resolveQueueIds(DisplayScreen $screen): array
    {
        $ids = array_values(array_unique(array_filter(array_map(
            fn ($id) => (int) $id,
            $screen->service_queue_ids ?? [],
        ))));

        if ($ids !== []) {
            return $ids;
        }

        return ServiceQueue::query()
            ->where('organization_id', $screen->organization_id)
            ->when($screen->branch_id, fn ($query) => $query->where('branch_id', $screen->branch_id))
            ->where('is_active', true)
            ->orderBy('name')
            ->pluck('id')
            ->map(fn ($id) => (int) $id)
            ->all();
    }
}