<?php

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use App\Models\Competition;
use App\Models\CompetitionAdmin;
use App\Support\BizDateTime;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Schema;
use Illuminate\Validation\Rule;

class CompetitionAdminController extends Controller
{
    public function index(Request $request, Competition $competition): JsonResponse
    {
        $data = $request->validate([
            'page' => ['sometimes', 'integer', 'min:1'],
            'per_page' => ['sometimes', 'integer', 'min:1', 'max:100'],
            'keyword' => ['sometimes', 'nullable', 'string', 'max:100'],
            'event_location' => ['sometimes', 'nullable', 'string', 'max:64'],
        ]);

        $query = $competition->competitionAdmins()->orderByDesc('id');
        $keyword = trim((string) ($data['keyword'] ?? ''));
        $hasMobile = Schema::hasColumn('competition_admins', 'mobile');
        $hasEventLocation = Schema::hasColumn('competition_admins', 'event_location');
        if ($keyword !== '') {
            $like = '%'.str_replace(['%', '_'], ['\\%', '\\_'], $keyword).'%';
            $query->where(function ($q) use ($like, $hasMobile): void {
                $q->where('username', 'like', $like)
                    ->orWhere('name', 'like', $like);
                if ($hasMobile) {
                    $q->orWhere('mobile', 'like', $like);
                }
            });
        }
        $eventLocation = trim((string) ($data['event_location'] ?? ''));
        if ($eventLocation !== '' && $hasEventLocation) {
            $query->where('event_location', $eventLocation);
        }

        $perPage = min((int) ($data['per_page'] ?? 15), 100);
        $paginator = $query->paginate($perPage);
        $paginator->getCollection()->transform(fn (CompetitionAdmin $row) => $this->toRow($row));

        return response()->json($paginator);
    }

    public function store(Request $request, Competition $competition): JsonResponse
    {
        $data = $this->validatedPayload($request, $competition);

        $payload = [
            'username' => $data['username'],
            'password_hash' => $data['password'],
            'name' => $data['name'],
            'status' => $data['status'] ?? 'active',
        ];
        if (Schema::hasColumn('competition_admins', 'mobile')) {
            $payload['mobile'] = $data['mobile'] ?? null;
        }
        if (Schema::hasColumn('competition_admins', 'event_location')) {
            $payload['event_location'] = $data['event_location'] ?? null;
        }
        $row = $competition->competitionAdmins()->create($payload);

        return response()->json($this->toRow($row), 201);
    }

    public function update(Request $request, Competition $competition, CompetitionAdmin $competition_admin): JsonResponse
    {
        $this->ensureBelongs($competition, $competition_admin);
        $data = $this->validatedPayload($request, $competition, (int) $competition_admin->id);

        $fill = [
            'username' => $data['username'],
            'name' => $data['name'],
            'status' => $data['status'] ?? $competition_admin->status,
        ];
        if (Schema::hasColumn('competition_admins', 'mobile')) {
            $fill['mobile'] = array_key_exists('mobile', $data) ? $data['mobile'] : $competition_admin->mobile;
        }
        if (Schema::hasColumn('competition_admins', 'event_location')) {
            $fill['event_location'] = array_key_exists('event_location', $data)
                ? $data['event_location']
                : $competition_admin->event_location;
        }
        $competition_admin->fill($fill);
        if (! empty($data['password'])) {
            $competition_admin->password_hash = $data['password'];
        }
        $competition_admin->save();

        return response()->json($this->toRow($competition_admin->fresh()));
    }

    public function destroy(Competition $competition, CompetitionAdmin $competition_admin): JsonResponse
    {
        $this->ensureBelongs($competition, $competition_admin);
        $competition_admin->delete();

        return response()->json(['message' => 'deleted']);
    }

    /**
     * @return array<string, mixed>
     */
    private function validatedPayload(Request $request, Competition $competition, ?int $ignoreId = null): array
    {
        return $request->validate([
            'username' => [
                'required',
                'string',
                'max:64',
                'regex:/^[A-Za-z0-9._-]+$/',
                Rule::unique('competition_admins', 'username')
                    ->where(fn ($q) => $q->where('competition_id', $competition->id))
                    ->ignore($ignoreId),
            ],
            'name' => ['required', 'string', 'max:64'],
            'mobile' => ['sometimes', 'nullable', 'string', 'max:20'],
            'event_location' => [
                'sometimes',
                'nullable',
                'string',
                'max:64',
                Rule::in(config('contest.event_locations', ['shanghai', 'suzhou', 'shenzhen'])),
            ],
            'password' => [$ignoreId ? 'nullable' : 'required', 'string', 'min:6', 'max:255'],
            'status' => ['sometimes', 'string', Rule::in(['active', 'disabled'])],
        ], [
            'username.regex' => '账号仅限字母、数字和 ._-',
        ]);
    }

    private function ensureBelongs(Competition $competition, CompetitionAdmin $admin): void
    {
        if (! $admin->belongsToCompetition((int) $competition->id)) {
            abort(404);
        }
    }

    /**
     * @return array<string, mixed>
     */
    private function toRow(CompetitionAdmin $row): array
    {
        return [
            'id' => $row->id,
            'competition_id' => $row->competition_id,
            'username' => $row->username,
            'name' => $row->name,
            'mobile' => $row->mobile,
            'event_location' => $row->event_location,
            'status' => $row->status,
            'last_login_at' => BizDateTime::toIso8601($row->last_login_at),
            'created_at' => BizDateTime::toIso8601($row->created_at),
            'password_set' => $row->usesPassword(),
            'password_display' => $row->usesPassword() ? '········' : '—',
        ];
    }
}