cx-newsletter/builders/1-campaign_builder.php

<?php

namespace cx_newsletter;

class campaign_builder
extends builder
implements builder_interface {
    protected function prepare() : void {
        $this->target = new campaign();
    }

    public function set_type(campaign_type $type) : self {
        $this->target->type = $type;

        if ($this->target->is_complete()) {
            $this->complete();
        }

        return $this;
    }

    public function set_message(message $message) : self {
        if (!$message->has_id()) {
            throw new \exception('Message to set for campaign must has ID.');
        }

        $this->target->message = $message;

        if ($this->target->is_complete()) {
            $this->complete();
        }

        return $this;
    }

    public function set_group(group $group) : self {
        $this->target->group = $group;

        if ($this->target->is_complete()) {
            $this->complete();
        }

        return $this;
    }

    public function set_test(bool $test = true) : self {
        $this->target->test = $test;

        if ($this->target->is_complete()) {
            $this->complete();
        }
    
        return $this;
    }
}