<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Http\Requests\StoreUserRequest;
use App\Http\Requests\UpdateUserRequest;
use App\Models\ServerResource;
use App\Models\User;
use App\Models\UserServerPermission;
use hg\apidoc\annotation as Apidoc;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Spatie\Permission\Models\Permission;

#[Apidoc\Title('用户管理')]
class UserController extends Controller
{
    public function __construct()
    {
        $this->middleware('auth:api');
        $this->middleware('permission:platform.users.view,api')->only(['index', 'show']);
        $this->middleware('permission:platform.users.manage,api')->only(['store', 'update', 'destroy', 'syncPermissions']);
    }

    #[Apidoc\Title('用户列表'), Apidoc\Method('GET'), Apidoc\Url('/users')]
    public function index(Request $request): JsonResponse
    {
        $validated = $request->validate([
            'per_page' => ['nullable', 'integer', 'min:1', 'max:100'],
            'sort_by' => ['nullable', 'string', 'in:id,nickname,email,phone,created_at'],
            'sort_order' => ['nullable', 'string', 'in:asc,desc'],
        ]);

        $sortBy = $validated['sort_by'] ?? 'created_at';
        $sortOrder = $validated['sort_order'] ?? 'desc';
        $perPage = (int) ($validated['per_page'] ?? 20);

        $users = User::query()
            ->with('roles')
            ->orderBy($sortBy, $sortOrder)
            ->paginate($perPage);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $users]);
    }

    #[Apidoc\Title('创建用户'), Apidoc\Method('POST'), Apidoc\Url('/users')]
    public function store(StoreUserRequest $request): JsonResponse
    {
        $user = User::query()->create($request->validated());

        if ($request->filled('role_ids')) {
            $user->syncRoles($request->validated('role_ids'));
        }

        $this->auditLog($request, 'user_create', ['metadata' => ['target_user_id' => $user->id]]);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $user->load('roles')], 201);
    }

    #[Apidoc\Title('用户详情'), Apidoc\Method('GET'), Apidoc\Url('/users/{id}')]
    public function show(int $id): JsonResponse
    {
        $user = User::query()->with(['roles', 'permissions', 'serverResources'])->findOrFail($id);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $user]);
    }

    #[Apidoc\Title('更新用户'), Apidoc\Method('PUT'), Apidoc\Url('/users/{id}')]
    public function update(UpdateUserRequest $request, int $id): JsonResponse
    {
        $user = User::query()->findOrFail($id);
        $user->fill($request->safe()->except(['role_ids']));

        if ($request->filled('password')) {
            $user->password = $request->validated('password');
        }

        $user->save();

        if ($request->has('role_ids')) {
            $user->syncRoles($request->validated('role_ids'));
        }

        $this->auditLog($request, 'user_update', ['metadata' => ['target_user_id' => $user->id]]);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $user->load('roles')]);
    }

    #[Apidoc\Title('同步用户权限'), Apidoc\Method('PUT'), Apidoc\Url('/users/{id}/permissions')]
    public function syncPermissions(Request $request, int $id): JsonResponse
    {
        $validated = $request->validate([
            'permission_ids' => ['present', 'array'],
            'permission_ids.*' => ['integer', 'exists:permissions,id'],
        ]);

        $user = User::query()->findOrFail($id);
        $user->syncPermissions($validated['permission_ids']);
        $this->syncServerResourcePermissionsByDirectPermissions($user, $validated['permission_ids']);

        $this->auditLog($request, 'user_permissions_update', ['metadata' => ['target_user_id' => $user->id, 'permission_ids' => $validated['permission_ids']]]);

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => $user->load(['roles', 'permissions'])]);
    }

    #[Apidoc\Title('删除用户'), Apidoc\Method('DELETE'), Apidoc\Url('/users/{id}')]
    public function destroy(Request $request, int $id): JsonResponse
    {
        $user = User::query()->findOrFail($id);
        $this->auditLog($request, 'user_delete', ['metadata' => ['target_user_id' => $user->id]]);
        $user->delete();

        return response()->json(['code' => 0, 'message' => 'ok', 'data' => null]);
    }

    private function syncServerResourcePermissionsByDirectPermissions(User $user, array $permissionIds): void
    {
        $resourcePermissions = Permission::query()
            ->select(['id', 'name', 'description'])
            ->whereIn('id', $permissionIds)
            ->where('guard_name', 'api')
            ->where('name', 'like', 'resource.servers.use.%')
            ->get();

        $grantedResourceIds = $resourcePermissions
            ->map(fn (Permission $permission): ?int => $this->resourceIdFromPermissionDescription((string) $permission->description))
            ->filter(fn (?int $resourceId): bool => $resourceId !== null)
            ->map(fn (int $resourceId): int => (int) $resourceId)
            ->values()
            ->all();

        if (count($grantedResourceIds) > 0) {
            $existingResourceIds = ServerResource::query()
                ->whereIn('id', $grantedResourceIds)
                ->whereNotNull('parent_id')
                ->pluck('id')
                ->map(fn (int $resourceId): int => (int) $resourceId)
                ->all();

            foreach ($existingResourceIds as $resourceId) {
                UserServerPermission::query()->updateOrCreate(
                    [
                        'user_id' => $user->id,
                        'server_resource_id' => $resourceId,
                    ],
                    [
                        'can_ssh' => true,
                        'can_sftp' => true,
                        'can_rdp' => true,
                    ]
                );
            }
        }

        $managedResourceIds = Permission::query()
            ->where('guard_name', 'api')
            ->where('name', 'like', 'resource.servers.use.%')
            ->where('description', 'like', '服务器资源访问权限（资源ID:%')
            ->pluck('description')
            ->map(fn (string $description): ?int => $this->resourceIdFromPermissionDescription($description))
            ->filter(fn (?int $resourceId): bool => $resourceId !== null)
            ->map(fn (int $resourceId): int => $resourceId)
            ->values()
            ->all();

        if (count($managedResourceIds) > 0) {
            UserServerPermission::query()
                ->where('user_id', $user->id)
                ->whereIn('server_resource_id', $managedResourceIds)
                ->whereNotIn('server_resource_id', $grantedResourceIds)
                ->update([
                    'can_ssh' => false,
                    'can_sftp' => false,
                    'can_rdp' => false,
                ]);
        }
    }

    private function resourceIdFromPermissionDescription(string $description): ?int
    {
        if (! preg_match('/资源ID:\s*(\d+)/u', $description, $matches)) {
            return null;
        }

        return isset($matches[1]) ? (int) $matches[1] : null;
    }
}