<?php

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use App\Http\Requests\Admin\StoreAudienceSessionRequest;
use App\Http\Requests\Admin\UpdateAudienceSessionRequest;
use App\Models\AudienceSession;
use App\Models\Competition;
use App\Support\BizDateTime;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Response;
use Illuminate\Validation\ValidationException;

class AudienceSessionController extends Controller
{
    public function index(Competition $competition): JsonResponse
    {
        $sessions = $competition->audienceSessions()
            ->withCount([
                'registrations',
                'registrations as checked_in_count' => fn ($q) => $q->whereNotNull('checked_in_at'),
            ])
            ->orderBy('sort')
            ->orderBy('id')
            ->get()
            ->map(fn (AudienceSession $session) => $this->toArray($session));

        return response()->json(['data' => $sessions]);
    }

    public function store(StoreAudienceSessionRequest $request, Competition $competition): JsonResponse
    {
        /** @var array<string, mixed> $validated */
        $validated = $request->validated();
        $session = $competition->audienceSessions()->create($validated);
        $session->loadCount([
            'registrations',
            'registrations as checked_in_count' => fn ($q) => $q->whereNotNull('checked_in_at'),
        ]);

        return response()->json($this->toArray($session), 201);
    }

    public function show(Competition $competition, AudienceSession $audience_session): JsonResponse
    {
        $this->ensureBelongs($competition, $audience_session);
        $audience_session->loadCount([
            'registrations',
            'registrations as checked_in_count' => fn ($q) => $q->whereNotNull('checked_in_at'),
        ]);

        return response()->json($this->toArray($audience_session));
    }

    public function update(
        UpdateAudienceSessionRequest $request,
        Competition $competition,
        AudienceSession $audience_session,
    ): JsonResponse {
        $this->ensureBelongs($competition, $audience_session);

        /** @var array<string, mixed> $validated */
        $validated = $request->validated();
        if (array_key_exists('capacity', $validated)) {
            $registered = $audience_session->registeredCount();
            if ((int) $validated['capacity'] < $registered) {
                throw ValidationException::withMessages([
                    'capacity' => ['容量不能小于已报名人数（'.$registered.'）'],
                ]);
            }
        }

        $audience_session->fill($validated);
        $audience_session->save();
        $audience_session->loadCount([
            'registrations',
            'registrations as checked_in_count' => fn ($q) => $q->whereNotNull('checked_in_at'),
        ]);

        return response()->json($this->toArray($audience_session));
    }

    public function destroy(Competition $competition, AudienceSession $audience_session): Response
    {
        $this->ensureBelongs($competition, $audience_session);

        if ($audience_session->registrations()->exists()) {
            throw ValidationException::withMessages([
                'audience_session' => ['该场次已有报名记录，请停用而不是删除'],
            ]);
        }

        $audience_session->delete();

        return response()->noContent();
    }

    /**
     * @return array<string, mixed>
     */
    private function toArray(AudienceSession $session): array
    {
        return [
            'id' => $session->id,
            'competition_id' => $session->competition_id,
            'code' => $session->code,
            'name' => $session->name,
            'event_date_text' => $session->event_date_text,
            'address' => $session->address,
            'capacity' => (int) $session->capacity,
            'registered_count' => $session->registeredCount(),
            'checked_in_count' => $session->checkedInCount(),
            'remaining' => $session->remainingCount(),
            'signup_start_at' => BizDateTime::toIso8601($session->signup_start_at),
            'signup_end_at' => BizDateTime::toIso8601($session->signup_end_at),
            'is_final' => (bool) $session->is_final,
            'sort' => (int) $session->sort,
            'enabled' => (bool) $session->enabled,
            'status' => $session->windowStatus(),
            'status_label' => $session->statusLabel(),
            'created_at' => BizDateTime::toIso8601($session->created_at),
            'updated_at' => BizDateTime::toIso8601($session->updated_at),
        ];
    }

    private function ensureBelongs(Competition $competition, AudienceSession $session): void
    {
        if ((int) $session->competition_id !== (int) $competition->id) {
            abort(404);
        }
    }
}