Where-in-the-World-is-Ben/app/Mail/Digest.php

<?php

namespace App\Mail;

use DateTime;
use App\Http\Controllers\TrackerController;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class Digest extends Mailable
{
    use Queueable, SerializesModels;

    /**
     * The type of digest (e.g. weekly, monthly, etc.).
     * TODO: Replace with enum
     *
     * @var string
     */
    public $digest_type;

    /**
     * The current trip locations as a JSON object.
     *
     * @var string
     */
    public $locations;

    /**
     * The current trip checkins as a JSON object.
     *
     * @var string
     */
    public $checkins;

    /**
     * Create a new message instance.
     *
     * @param string $digest_type
     * @param string $trip_id
     * @return void
     */
    public function __construct(string $digest_type, string $trip_id)
    {
        $this->digest_type = $digest_type;
        $trip = (new TrackerController)->get_trip_data($trip_id);

        $cutoffDateTime = new DateTime();
        switch ($this->digest_type) {
        case 'daily':
            $cutoffDateTime->modify('-1 day');
            break;
        case 'weekly':
            $cutoffDateTime->modify('-1 week');
            break;
        case 'fortnightly':
            $cutoffDateTime->modify('-2 weeks');
            break;
        case 'monthly':
            $cutoffDateTime->modify('-1 month');
            break;
        default:
        }

        $this->locations = array_filter(
            $trip->locations, 
            function($elem) use ($cutoffDateTime) {
                $elemDateTime = new DateTime($elem->created_at);
                return $elemDateTime > $cutoffDateTime;
            }
        );

        $this->checkins = array_filter(
            $trip->checkins, 
            function($elem) use ($cutoffDateTime) {
                $elemDateTime = new DateTime($elem->created_at);
                return $elemDateTime > $cutoffDateTime;
            }
        );
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        return $this->view('emails.digest')
            ->subject("track.bengoldsworthy.net ".ucwords($this->digest_type)." Digest");
    }
}