<?php

namespace App\Services;

use App\Models\Department;
use App\Models\Feedback;
use App\Models\TicketTransferLog;
use App\Models\User;
use App\Services\ActivityLogger;
use Illuminate\Validation\ValidationException;

class TransferService
{
    public function transfer(
        Feedback $feedback,
        Department $toDepartment,
        string $reason,
        User $sender,
        ?int $newHandlerId = null,
    ): TicketTransferLog {
        if (empty(trim($reason))) {
            throw ValidationException::withMessages([
                'reason' => __('feedback.transfer_reason_required'),
            ]);
        }

        if ($newHandlerId !== null) {
            $handler = User::find($newHandlerId);
            if (! $handler) {
                throw ValidationException::withMessages([
                    'new_assignee_id' => __('feedback.user_not_found'),
                ]);
            }
            if ($handler->department_id !== $toDepartment->id && $toDepartment->manager_id !== $handler->id) {
                throw ValidationException::withMessages([
                    'new_assignee_id' => __('feedback.handler_not_in_department'),
                ]);
            }
        }

        $fromDepartmentId = $feedback->current_department_id;
        $fromDepartmentName = $feedback->currentDepartment?->name ?? 'N/A';

        $log = TicketTransferLog::create([
            'feedback_id' => $feedback->id,
            'from_department_id' => $fromDepartmentId,
            'to_department_id' => $toDepartment->id,
            'sender_id' => $sender->id,
            'reason' => $reason,
        ]);

        $feedback->update([
            'current_department_id' => $toDepartment->id,
            'assigned_to' => $newHandlerId ?? $toDepartment->manager_id ?? null,
        ]);

        $this->notifyDepartmentManager($toDepartment, $feedback, $log, $sender);

        ActivityLogger::log(
            'transfer',
            __('feedback.log_transfer', [
                'title' => $feedback->title,
                'from' => $fromDepartmentName,
                'to' => $toDepartment->name,
            ]),
            $feedback,
            [
                'feedback_id' => $feedback->id,
                'from_department' => $fromDepartmentName,
                'to_department' => $toDepartment->name,
                'reason' => $reason,
            ],
        );

        return $log;
    }

    protected function notifyDepartmentManager(Department $department, Feedback $feedback, TicketTransferLog $log, User $sender): void
    {
        $manager = $department->manager;

        if ($manager) {
            $manager->notify(new \App\Notifications\TicketTransferred($feedback, $log, $sender));
        } else {
            // No manager! Notify admins
            $admins = User::whereHas('roles', fn ($q) => $q->where('name', 'admin'))->get();
            foreach ($admins as $admin) {
                $admin->notify(new \App\Notifications\TicketTransferred($feedback, $log, $sender));
            }
        }
    }
}