<?php

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use App\Models\AdminUser;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Hash;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;

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

        $query = AdminUser::query()->orderByDesc('id');
        $keyword = trim((string) ($data['keyword'] ?? ''));
        if ($keyword !== '') {
            $like = '%'.str_replace(['%', '_'], ['\\%', '\\_'], $keyword).'%';
            $query->where(function ($q) use ($like): void {
                $q->where('username', 'like', $like)
                    ->orWhere('name', 'like', $like)
                    ->orWhere('mobile', 'like', $like);
            });
        }

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

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

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

        if (AdminUser::query()->where('username', $data['username'])->exists()) {
            throw ValidationException::withMessages(['username' => ['该账号已存在']]);
        }

        $user = AdminUser::query()->create([
            'username' => $data['username'],
            'password_hash' => $data['password'],
            'name' => $data['name'],
            'mobile' => $data['mobile'] ?? null,
            'status' => $data['status'] ?? 'active',
        ]);

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

    public function update(Request $request, AdminUser $adminUser): JsonResponse
    {
        $data = $this->validatedPayload($request, $adminUser->id);

        if (AdminUser::query()->where('username', $data['username'])->where('id', '!=', $adminUser->id)->exists()) {
            throw ValidationException::withMessages(['username' => ['该账号已存在']]);
        }

        $adminUser->fill([
            'username' => $data['username'],
            'name' => $data['name'],
            'mobile' => $data['mobile'] ?? null,
            'status' => $data['status'] ?? $adminUser->status,
        ]);

        if (! empty($data['password'])) {
            $adminUser->password_hash = $data['password'];
        }

        $adminUser->save();

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

    public function destroy(AdminUser $adminUser, Request $request): JsonResponse
    {
        /** @var AdminUser $current */
        $current = $request->user();
        if ((int) $current->id === (int) $adminUser->id) {
            throw ValidationException::withMessages(['admin_user' => ['不能删除当前登录账号']]);
        }

        $adminUser->delete();

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

    /**
     * @return array<string, mixed>
     */
    private function validatedPayload(Request $request, ?int $ignoreId = null): array
    {
        return $request->validate([
            'username' => [
                'required',
                'string',
                'max:64',
                'regex:/^[A-Za-z0-9._-]+$/',
                Rule::unique('admin_users', 'username')->ignore($ignoreId),
            ],
            'name' => ['required', 'string', 'max:64'],
            'mobile' => ['nullable', 'string', 'max:20'],
            'password' => [$ignoreId ? 'nullable' : 'required', 'string', 'min:6', 'max:255'],
            'status' => ['sometimes', 'string', Rule::in(['active', 'disabled'])],
        ]);
    }

    /**
     * @return array<string, mixed>
     */
    private function toRow(AdminUser $user): array
    {
        return [
            'id' => $user->id,
            'username' => $user->username,
            'name' => $user->name,
            'mobile' => $user->mobile,
            'status' => $user->status,
            'last_login_at' => $user->last_login_at?->toIso8601String(),
            'created_at' => $user->created_at?->toIso8601String(),
            'password_set' => $user->usesPassword(),
        ];
    }
}