<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api\V1;

use App\Http\Controllers\Controller;
use App\Http\Controllers\Api\V1\Traits\VerifiesOrganisationEvent;
use App\Http\Requests\Api\V1\StoreTimeSlotRequest;
use App\Http\Requests\Api\V1\UpdateTimeSlotRequest;
use App\Http\Resources\Api\V1\TimeSlotResource;
use App\Models\Event;
use App\Models\Organisation;
use App\Models\TimeSlot;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Resources\Json\AnonymousResourceCollection;
use Illuminate\Support\Facades\Gate;

final class TimeSlotController extends Controller
{
    use VerifiesOrganisationEvent;

    public function index(Organisation $organisation, Event $event): AnonymousResourceCollection
    {
        $this->verifyEventBelongsToOrganisation($organisation, $event);
        Gate::authorize('viewAny', [TimeSlot::class, $event]);

        $timeSlots = $event->timeSlots()
            ->withCount('shifts')
            ->with(['shifts' => fn ($q) => $q->withCount([
                'shiftAssignments as assignments_count' => fn ($q) => $q->where('status', 'approved'),
            ])])
            ->orderBy('date')
            ->orderBy('start_time')
            ->get();

        // For sub-events: include parent festival time slots
        if ($event->isSubEvent() && request()->boolean('include_parent') && $event->parent_event_id) {
            $parentTimeSlots = TimeSlot::where('event_id', $event->parent_event_id)
                ->withCount('shifts')
                ->with([
                    'event',
                    'shifts' => fn ($q) => $q->withCount([
                        'shiftAssignments as assignments_count' => fn ($q) => $q->where('status', 'approved'),
                    ]),
                ])
                ->orderBy('date')
                ->orderBy('start_time')
                ->get();

            $timeSlots->load('event');
            $timeSlots->each(fn (TimeSlot $ts) => $ts->setAttribute('source', 'sub_event'));
            $parentTimeSlots->each(fn (TimeSlot $ts) => $ts->setAttribute('source', 'festival'));

            $timeSlots = $timeSlots->merge($parentTimeSlots)
                ->sortBy([['date', 'asc'], ['start_time', 'asc']])
                ->values();
        }

        // For festivals: include all sub-event time slots (for cross_event section shift dialogs)
        if (!$event->isSubEvent() && request()->boolean('include_children')) {
            $childEventIds = Event::where('parent_event_id', $event->id)->pluck('id');

            if ($childEventIds->isNotEmpty()) {
                $childTimeSlots = TimeSlot::whereIn('event_id', $childEventIds)
                    ->withCount('shifts')
                    ->with([
                        'event',
                        'shifts' => fn ($q) => $q->withCount([
                            'shiftAssignments as assignments_count' => fn ($q) => $q->where('status', 'approved'),
                        ]),
                    ])
                    ->orderBy('date')
                    ->orderBy('start_time')
                    ->get();

                $timeSlots->load('event');
                $timeSlots->each(fn (TimeSlot $ts) => $ts->setAttribute('source', 'own'));
                $childTimeSlots->each(function (TimeSlot $ts) use ($event) {
                    $ts->setAttribute('source', $ts->event_id);
                });

                $timeSlots = $timeSlots->merge($childTimeSlots)
                    ->sortBy([['date', 'asc'], ['start_time', 'asc']])
                    ->values();
            }
        }

        return TimeSlotResource::collection($timeSlots);
    }

    public function store(StoreTimeSlotRequest $request, Organisation $organisation, Event $event): JsonResponse
    {
        $this->verifyEventBelongsToOrganisation($organisation, $event);
        Gate::authorize('create', [TimeSlot::class, $event]);

        $timeSlot = $event->timeSlots()->create($request->validated());

        return $this->created(new TimeSlotResource($timeSlot));
    }

    public function update(UpdateTimeSlotRequest $request, Organisation $organisation, Event $event, TimeSlot $timeSlot): JsonResponse
    {
        $this->verifyEventBelongsToOrganisation($organisation, $event);
        Gate::authorize('update', [$timeSlot, $event]);

        $timeSlot->update($request->validated());

        return $this->success(new TimeSlotResource($timeSlot->fresh()));
    }

    public function destroy(Organisation $organisation, Event $event, TimeSlot $timeSlot): JsonResponse
    {
        $this->verifyEventBelongsToOrganisation($organisation, $event);
        Gate::authorize('delete', [$timeSlot, $event]);

        $timeSlot->delete();

        return response()->json(null, 204);
    }
}