<?php

namespace App\Livewire\Admin;

use App\Models\Customer;
use App\Models\User;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Str;
use Spatie\Permission\Models\Role;
use Livewire\Attributes\Layout;
use Livewire\Attributes\Validate;
use Livewire\Component;

/**
 * Operator settings: the signed-in operator's own account plus (Owner-only)
 * staff management. All staff mutations are capability-gated server-side and
 * protect the last-Owner and self-role invariants transactionally.
 */
#[Layout('layouts.admin')]
class Settings extends Component
{
    // My account
    #[Validate('required|string|max:255')]
    public string $name = '';

    #[Validate('required|email|max:255')]
    public string $email = '';

    // Invite staff
    #[Validate('required|string|max:255')]
    public string $staffName = '';

    #[Validate('required|email|max:255')]
    public string $staffEmail = '';

    #[Validate('required|in:Owner,Admin,Support,Billing,Read-only')]
    public string $staffRole = 'Support';

    public function mount(): void
    {
        $this->name = auth()->user()->name;
        $this->email = auth()->user()->email;
    }

    public function saveAccount(): void
    {
        $user = auth()->user();
        $data = $this->validate([
            'name' => 'required|string|max:255',
            'email' => 'required|email|max:255|unique:users,email,'.$user->id,
        ]);

        // An operator email must never collide with a customer's — that would
        // block the customer from ever obtaining a portal login (ensureUser).
        if (Customer::query()->where('email', $data['email'])->exists()) {
            $this->addError('email', __('admin_settings.is_customer'));

            return;
        }

        $user->update($data);
        $this->dispatch('notify', message: __('admin_settings.account_saved'));
    }

    public function inviteStaff(): void
    {
        $this->authorize('staff.manage');
        $data = $this->validate([
            'staffName' => 'required|string|max:255',
            'staffEmail' => 'required|email|max:255|unique:users,email',
            'staffRole' => 'required|in:Owner,Admin,Support,Billing,Read-only',
        ]);

        // Only an Owner may create another Owner.
        if ($data['staffRole'] === 'Owner' && ! auth()->user()->hasRole('Owner')) {
            $this->addError('staffRole', __('admin_settings.owner_only'));

            return;
        }
        // Never turn a customer's portal login into an operator.
        if (Customer::query()->where('email', $data['staffEmail'])->exists()) {
            $this->addError('staffEmail', __('admin_settings.is_customer'));

            return;
        }

        $user = User::create([
            'name' => $data['staffName'],
            'email' => $data['staffEmail'],
            'password' => Hash::make(Str::random(40)), // invite/reset delivery is mocked
            'is_admin' => true,
        ]);
        $user->assignRole($data['staffRole']);

        $this->reset('staffName', 'staffEmail');
        $this->staffRole = 'Support';
        $this->dispatch('notify', message: __('admin_settings.staff_invited'));
    }

    public function setStaffRole(int $id, string $role): void
    {
        $this->authorize('staff.manage');
        if (! in_array($role, User::OPERATOR_ROLES, true)) {
            return;
        }

        $result = DB::transaction(function () use ($id, $role) {
            // Serialize on the Owner role so the global owner count can't be
            // raced to zero by concurrent demotions of different owners.
            Role::query()->where('name', 'Owner')->lockForUpdate()->first();

            $target = User::query()->whereKey($id)->lockForUpdate()->first();
            if ($target === null) {
                return 'gone';
            }
            if ($target->id === auth()->id()) {
                return 'self';
            }
            // Only existing operators may be re-roled — never escalate a customer
            // (or any non-staff) user into the console via a tampered id.
            if (! $target->isOperator() || Customer::query()->where('email', $target->email)->exists()) {
                return 'not_staff';
            }
            // Granting or revoking Owner is Owner-only.
            if (($role === 'Owner' || $target->hasRole('Owner')) && ! auth()->user()->hasRole('Owner')) {
                return 'owner_only';
            }
            // Never demote the last Owner.
            if ($target->hasRole('Owner') && $role !== 'Owner' && $this->ownerCount() <= 1) {
                return 'last_owner';
            }
            $target->syncRoles([$role]);

            return 'ok';
        });

        $this->flash($result);
    }

    public function revokeStaff(int $id): void
    {
        $this->authorize('staff.manage');

        $result = DB::transaction(function () use ($id) {
            Role::query()->where('name', 'Owner')->lockForUpdate()->first();

            $target = User::query()->whereKey($id)->lockForUpdate()->first();
            if ($target === null || ! $target->isOperator()) {
                return 'gone';
            }
            if ($target->id === auth()->id()) {
                return 'self';
            }
            if ($target->hasRole('Owner') && $this->ownerCount() <= 1) {
                return 'last_owner';
            }
            $target->syncRoles([]);
            $target->update(['is_admin' => false]);

            return 'revoked';
        });

        $this->flash($result);
    }

    private function flash(string $result): void
    {
        $msg = match ($result) {
            'ok' => __('admin_settings.role_updated'),
            'revoked' => __('admin_settings.staff_revoked'),
            'self' => __('admin_settings.not_self'),
            'owner_only' => __('admin_settings.owner_only'),
            'last_owner' => __('admin_settings.last_owner'),
            'not_staff' => __('admin_settings.not_staff'),
            default => null,
        };
        if ($msg !== null) {
            $this->dispatch('notify', message: $msg);
        }
    }

    private function ownerCount(): int
    {
        return User::query()->whereHas('roles', fn ($q) => $q->where('name', 'Owner'))->count();
    }

    public function render()
    {
        $staff = User::query()
            ->whereHas('roles', fn ($q) => $q->whereIn('name', User::OPERATOR_ROLES))
            ->with('roles')
            ->orderBy('name')
            ->get()
            ->map(fn (User $u) => [
                'id' => $u->id,
                'name' => $u->name,
                'email' => $u->email,
                'role' => $u->roles->first()?->name ?? '—',
                'self' => $u->id === auth()->id(),
            ]);

        return view('livewire.admin.settings', [
            'staff' => $staff,
            'roles' => User::OPERATOR_ROLES,
            'canManageStaff' => auth()->user()->can('staff.manage'),
            'isOwner' => auth()->user()->hasRole('Owner'),
        ]);
    }
}