trip-planner/backend/app/Domain/PlannedItem/Policies/PlannedItemPolicy.php

<?php

namespace App\Domain\PlannedItem\Policies;

use App\Models\User;
use App\Models\PlannedItem;
use App\Models\Trip;

class PlannedItemPolicy
{
    /**
     * Determine if the user can create a planned item for the given trip
     */
    public function create(User $user, int $tripId): bool
    {
        return \DB::table('trips')
            ->where('id', $tripId)
            ->where('created_by_user_id', $user->id)
            ->exists();
    }

    /**
     * Determine if the user can update the planned item
     */
    public function update(User $user, PlannedItem $plannedItem): bool
    {
        return \DB::table('planned_items')
            ->join('calendar_slots', 'planned_items.calendar_slot_id', '=', 'calendar_slots.id')
            ->join('trips', 'calendar_slots.trip_id', '=', 'trips.id')
            ->where('planned_items.id', $plannedItem->id)
            ->where('trips.created_by_user_id', $user->id)
            ->exists();
    }

    /**
     * Determine if the user can delete the planned item
     */
    public function delete(User $user, PlannedItem $plannedItem): bool
    {
        return $this->update($user, $plannedItem);
    }

    /**
     * Determine if the user can move a planned item to a new calendar slot
     */
    public function moveToSlot(User $user, int $calendarSlotId): bool
    {
        return \DB::table('calendar_slots')
            ->join('trips', 'calendar_slots.trip_id', '=', 'trips.id')
            ->where('calendar_slots.id', $calendarSlotId)
            ->where('trips.created_by_user_id', $user->id)
            ->exists();
    }
}