<?php
namespace Grav\Plugin;

use AdnanHussainTurki\ListMonk\ListMonk;
use AdnanHussainTurki\ListMonk\Models\MonkSubscriber;
use Composer\Autoload\ClassLoader;
use Grav\Common\Data\Data;
use Grav\Common\Plugin;
use Grav\Plugin\Form\Form;
use Grav\Plugin\Listmonk\Exceptions\ListmonkClientException;
use Grav\Plugin\Listmonk\Exceptions\ListmonkException;
use RocketTheme\Toolbox\Event\Event;
use ValueError;

/**
 * Class ListmonkPlugin
 * @package Grav\Plugin
 */
class ListmonkPlugin extends Plugin
{
    private ?ListMonk $client = null;

    /**
     * @return array
     *
     * The getSubscribedEvents() gives the core a list of events
     *     that the plugin wants to listen to. The key of each
     *     array section is the event that the plugin listens to
     *     and the value (in the form of an array) contains the
     *     callable (or function) as well as the priority. The
     *     higher the number the higher the priority.
     */
    public static function getSubscribedEvents(): array
    {
        return [
            'onPluginsInitialized' => ['onPluginsInitialized', 0],
            'onFormProcessed' => ['onFormProcessed', 0],
        ];
    }

    /**
     * Composer autoload
     *
     * @return ClassLoader
     */
    public function autoload(): ClassLoader
    {
        return require __DIR__ . '/vendor/autoload.php';
    }

    /**
     * Initialize the plugin
     */
    public function onPluginsInitialized(): void
    {
        // Don't proceed if we are in the admin plugin
        if ($this->isAdmin()) {
            return;
        }

        // Enable the main events we are interested in
        $this->enable([
            // Put your main events here
        ]);
    }

    /**
     * Process `listmonk` form actions
     *
     * @param Event $event
     * @return void
     * @throws MailerSendException
     * @throws \JsonException
     * @throws \MailerSend\Exceptions\MailerSendAssertException
     */
    public function onFormProcessed(Event $event): void
    {
        $form = $event['form'];
        $params = $event['params'];

        switch ($event['action']) {
            case 'listmonk_newsletter':
                $this->processNewsletterForm($event, $form, $this->getParams($form, $params));
                break;

            #case 'listmonk':
            #    $this->processForm($event, $form, $this->getParams($form, $params));
            #    break;
        }#
    }

    /**
     * Process `listmonk_newsletter` form action
     *
     * @param Event $event
     * @return void
     */
    private function processNewsletterForm(Event $event, Form $form, array $params): void
    {
        try {
            $subscriber = new MonkSubscriber();
            $subscriber->setName($params['name']);
            $subscriber->setEmail($params['email']);
            $subscriber->setLists([
                $this->config->get('plugins.listmonk.newsletter.list')
            ]);
            $subscriber->setStatus($this->config->get('plugins.listmonk.newsletter.subscriber.status'));
            $subscriber->setAttribs($this->processAttributes([
                'source' => 'gravcms',
            ]));

            $this->grav->fireEvent('onListmonkSubscriberObjectCreated', new Event([
                'subscriber' => $subscriber,
            ]));

            $this->getListmonkClient()
                ->subscribers()
                ->create($subscriber);

            $this->grav->fireEvent('onListmonkSubscriberCreated', new Event([
                'subscriber' => $subscriber,
            ]));
        } catch (\Exception $e) {
            $this->grav->fireEvent('onFormValidationError', new Event([
                'form' => $form,
                'message' => $this->parseMessage($e->getMessage())
            ]));
            $event->stopPropagation();
        }
    }

    private function processAttributes(array $attributes): array
    {
        $globals = $this->config->get('plugins.listmonk.newsletter.subscriber.attributes');
        if ($globals) {
            $globals = json_decode($globals, true);
            if (!is_null($globals)) {
                $attributes = array_merge($globals, $attributes);
            }
        }

        return $attributes;
    }

    private function parseMessage(string $message): string
    {
        try {
            $json = json_decode($message, true);
            if (!is_null($json)) {
                if (isset($json['message'])) {
                    return $json['message'];
                }

                return json_encode($json, JSON_FORCE_OBJECT);
            }

            return $message;
        } catch (ValueError $e) {
            return $e->getMessage();
        }
    }

    /**
     * Process `listmonk` form action
     *
     * @param Event $event
     * @return void
     */
    private function processForm(Event $event, Form $form, array $params): void
    {
        try {
            $client = $this->getListmonkClient();

        } catch (ListmonkClientException $e) {
            $this->grav->fireEvent('onFormValidationError', new Event([
                'form' => $form,
                'message' => $e->getMessage()
            ]));
            $event->stopPropagation();
        } catch (ListmonkException $e) {
            $event->stopPropagation();
            throw new \RuntimeException('Error while processing form', -1, $e);
        }
    }

    private function getListmonkClient(): ListMonk
    {
        if ($this->client instanceof ListMonk) {
            return $this->client;
        }

        if (!$hostname = $this->config->get('plugins.listmonk.api.hostname')) {
            throw new ListmonkClientException('Listmonk API hostname not configured');
        }
        if (!$username = $this->config->get('plugins.listmonk.api.username')) {
            throw new ListmonkClientException('Listmonk API username not configured');
        }
        if (!$token = $this->config->get('plugins.listmonk.api.token')) {
            throw new ListmonkClientException('Listmonk API token not configured');
        }

        $this->client = new ListMonk($hostname, $username, $token);
        $this->grav->fireEvent('onListmonkClientCreated', new Event([
            'client' => $this->client
        ]));

        return $this->client;
    }

    private function getParams($form, $params): array
    {
        $vars = new Data([
            'form' => $form,
            'page' => $this->grav['page']
        ]);

        $this->grav->fireEvent('onListmonkVars', new Event([
            'vars' => $vars
        ]));

        return $this->processParams($params, $vars->toArray());
    }

    private function processParams(array $params, array $vars = []): array
    {
        $twig = $this->grav['twig'];
        array_walk_recursive($params, function(&$value) use ($twig, $vars) {
            $value = $twig->processString($value, $vars);
        });

        return $params;
    }
}