<?php

namespace App\Http\Controllers\SystemSettings;

use App\Models\Auth\Role;
use App\Models\Auth\User;
use App\Models\Auth\UserAccessGroup;
use App\Utilities\SystemAccess;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\Rule;

class Users extends Controller
{
    public function __construct()
    {
        $this->middleware(function ($request, $next) {
            abort_unless(SystemAccess::canOpenSettings(), 403);

            return $next($request);
        });
    }

    public function index()
    {
        $users = $this->queryForActor()->with('roles')->orderBy('id')->get();
        $groupNamesByUser = [];
        foreach (UserAccessGroup::forCompany()->with('users')->get() as $group) {
            foreach ($group->users as $member) {
                $groupNamesByUser[$member->id][] = $group->name;
            }
        }

        return view('system_settings.users.index', [
            'users' => $users,
            'roleLabels' => SystemAccess::roleLabels(),
            'groupNamesByUser' => $groupNamesByUser,
        ]);
    }

    public function create()
    {
        return view('system_settings.users.form', [
            'managedUser' => null,
            'roles' => SystemAccess::assignableRoles(),
        ]);
    }

    public function store(Request $request)
    {
        $data = $this->validateUser($request);
        $role = Role::where('name', $data['role'])->firstOrFail();

        DB::transaction(function () use ($data, $role) {
            $created = User::create([
                'name' => $data['name'],
                'email' => $data['email'],
                'password' => $data['password'],
                'locale' => 'zh-CN',
                'enabled' => (bool) ($data['enabled'] ?? false),
                'landing_page' => 'dashboard',
                'created_by' => user()->id,
                'created_from' => 'system_settings',
            ]);

            $created->roles()->attach($role->id);
            $created->companies()->attach(company_id());
        });

        flash('用户已新增。')->success();

        return redirect()->route('system-settings.users.index');
    }

    public function edit(int $id)
    {
        $managedUser = $this->findManagedUser($id);

        abort_unless(SystemAccess::canManageUser(user(), $managedUser), 403);

        return view('system_settings.users.form', [
            'managedUser' => $managedUser,
            'roles' => SystemAccess::assignableRoles(),
        ]);
    }

    public function update(int $id, Request $request)
    {
        $managedUser = $this->findManagedUser($id);

        abort_unless(SystemAccess::canManageUser(user(), $managedUser), 403);

        $data = $this->validateUser($request, $managedUser);
        $role = Role::where('name', $data['role'])->firstOrFail();

        if (
            SystemAccess::isSuperAdmin($managedUser)
            && $managedUser->enabled
            && ($data['role'] !== SystemAccess::SUPER_ADMIN || ! ($data['enabled'] ?? false))
            && $this->superAdminCount() <= 1
        ) {
            return back()->withErrors([
                $data['role'] !== SystemAccess::SUPER_ADMIN ? 'role' : 'enabled' => '系统至少需要保留一名启用的主管理员。',
            ])->withInput();
        }

        if ($managedUser->id === user()->id && ! ($data['enabled'] ?? false)) {
            return back()->withErrors(['enabled' => '不能停用当前登录账号。'])->withInput();
        }

        DB::transaction(function () use ($managedUser, $data, $role) {
            $attributes = [
                'name' => $data['name'],
                'email' => $data['email'],
                'enabled' => (bool) ($data['enabled'] ?? false),
            ];

            if (! empty($data['password'])) {
                $attributes['password'] = $data['password'];
            }

            $managedUser->update($attributes);
            $managedUser->syncRoles([$role->id]);
        });

        $managedUser->flushCache();

        flash('用户已修改。')->success();

        return redirect()->route('system-settings.users.index');
    }

    public function destroy(int $id)
    {
        $managedUser = $this->findManagedUser($id);

        abort_if($managedUser->id === user()->id, 422, '不能删除当前登录账号。');
        abort_unless(SystemAccess::canManageUser(user(), $managedUser), 403);

        if (SystemAccess::isSuperAdmin($managedUser) && $managedUser->enabled && $this->superAdminCount() <= 1) {
            return back()->withErrors(['user' => '系统至少需要保留一名启用的主管理员。']);
        }

        $managedUser->delete();

        flash('用户已删除。')->success();

        return redirect()->route('system-settings.users.index');
    }

    private function queryForActor()
    {
        $query = User::query()->whereHas('companies', function ($company) {
            $company->where('companies.id', company_id());
        });

        return $query;
    }

    private function findManagedUser(int $id): User
    {
        return $this->queryForActor()->with('roles')->findOrFail($id);
    }

    private function validateUser(Request $request, ?User $managedUser = null): array
    {
        $assignable = array_keys(SystemAccess::assignableRoles());

        return $request->validate([
            'name' => ['required', 'string', 'max:191'],
            'email' => [
                'required',
                'email',
                'max:191',
                Rule::unique('users', 'email')->ignore($managedUser?->id)->whereNull('deleted_at'),
            ],
            'role' => ['required', Rule::in($assignable)],
            'password' => [$managedUser ? 'nullable' : 'required', 'string', 'min:8', 'confirmed'],
            'enabled' => ['nullable', 'boolean'],
        ]);
    }

    private function superAdminCount(): int
    {
        return User::query()
            ->where('enabled', true)
            ->whereHas('roles', fn ($roles) => $roles->where('roles.name', SystemAccess::SUPER_ADMIN))
            ->count();
    }
}