<?php
/**
 * @link https://craftcms.com/
 * @copyright Copyright (c) Pixel & Tonic, Inc.
 * @license https://craftcms.github.io/license/
 */

namespace craft\controllers;

use Craft;
use craft\elements\GlobalSet;
use craft\errors\MissingComponentException;
use craft\helpers\App;
use craft\helpers\ArrayHelper;
use craft\helpers\MailerHelper;
use craft\helpers\UrlHelper;
use craft\mail\Mailer;
use craft\mail\transportadapters\BaseTransportAdapter;
use craft\mail\transportadapters\Sendmail;
use craft\mail\transportadapters\TransportAdapterInterface;
use craft\models\MailSettings;
use craft\web\assets\generalsettings\GeneralSettingsAsset;
use craft\web\Controller;
use craft\web\twig\TemplateLoaderException;
use DateTime;
use yii\base\Exception;
use yii\web\NotFoundHttpException;
use yii\web\Response;

/**
 * The SystemSettingsController class is a controller that handles various control panel settings related tasks such as
 * displaying, saving and testing Craft settings in the control panel.
 * Note that all actions in this controller require administrator access in order to execute.
 *
 * @author Pixel & Tonic, Inc. <support@pixelandtonic.com>
 * @since 3.0
 */
class SystemSettingsController extends Controller
{
    // Public Methods
    // =========================================================================

    /**
     * @inheritdoc
     */
    public function init()
    {
        // All system setting actions require an admin
        $this->requireAdmin();
    }

    /**
     * Shows the general settings form.
     *
     * @return Response
     */
    public function actionGeneralSettings(): Response
    {
        // Assemble the timezone options array (Technique adapted from http://stackoverflow.com/a/7022536/1688568)
        $timezoneOptions = [];

        $utc = new DateTime();
        $offsets = [];
        $timezoneIds = [];

        foreach (\DateTimeZone::listIdentifiers() as $timezoneId) {
            $timezone = new \DateTimeZone($timezoneId);
            $transition = $timezone->getTransitions($utc->getTimestamp(), $utc->getTimestamp());
            $abbr = $transition[0]['abbr'];

            $offset = round($timezone->getOffset($utc) / 60);

            if ($offset) {
                $hour = floor($offset / 60);
                $minutes = floor(abs($offset) % 60);

                $format = sprintf('%+d', $hour);

                if ($minutes) {
                    $format .= ':' . sprintf('%02u', $minutes);
                }
            } else {
                $format = '';
            }

            $offsets[] = $offset;
            $timezoneIds[] = $timezoneId;
            $timezoneOptions[] = [
                'value' => $timezoneId,
                'label' => 'UTC' . $format . ($abbr !== 'UTC' ? " ({$abbr})" : '') . ($timezoneId !== 'UTC' ? ' – ' . $timezoneId : '')
            ];
        }

        array_multisort($offsets, $timezoneIds, $timezoneOptions);

        $this->getView()->registerAssetBundle(GeneralSettingsAsset::class);

        return $this->renderTemplate('settings/general/_index', [
            'system' => Craft::$app->getProjectConfig()->get('system'),
            'timezoneOptions' => $timezoneOptions
        ]);
    }

    /**
     * Saves the general settings.
     *
     * @return Response|null
     */
    public function actionSaveGeneralSettings()
    {
        $this->requirePostRequest();

        $projectConfig = Craft::$app->getProjectConfig();
        $request = Craft::$app->getRequest();

        $projectConfig->set('system.name', $request->getBodyParam('name'));
        $projectConfig->set('system.live', (bool)$request->getBodyParam('live'));
        $projectConfig->set('system.timeZone', $request->getBodyParam('timeZone'));

        Craft::$app->getSession()->setNotice(Craft::t('app', 'General settings saved.'));
        return $this->redirectToPostedUrl();
    }

    /**
     * Renders the email settings page.
     *
     * @param MailSettings|null $settings The posted email settings, if there were any validation errors
     * @param TransportAdapterInterface|null $adapter The transport adapter, if there were any validation errors
     * @return Response
     * @throws Exception if a plugin returns an invalid mail transport type
     */
    public function actionEditEmailSettings(MailSettings $settings = null, TransportAdapterInterface $adapter = null): Response
    {
        if ($settings === null) {
            $settings = App::mailSettings();
        }

        if ($adapter === null) {
            try {
                $adapter = MailerHelper::createTransportAdapter($settings->transportType, $settings->transportSettings);
            } catch (MissingComponentException $e) {
                $adapter = new Sendmail();
                $adapter->addError('type', Craft::t('app', 'The transport type “{type}” could not be found.', [
                    'type' => $settings->transportType
                ]));
            }
        }

        // Get all the registered transport adapter types
        $allTransportAdapterTypes = MailerHelper::allMailerTransportTypes();

        // Make sure the selected adapter class is in there
        if (!in_array(get_class($adapter), $allTransportAdapterTypes, true)) {
            $allTransportAdapterTypes[] = get_class($adapter);
        }

        $allTransportAdapters = [];
        $transportTypeOptions = [];

        foreach ($allTransportAdapterTypes as $transportAdapterType) {
            /** @var string|TransportAdapterInterface $transportAdapterType */
            if ($transportAdapterType === get_class($adapter) || $transportAdapterType::isSelectable()) {
                $allTransportAdapters[] = MailerHelper::createTransportAdapter($transportAdapterType);
                $transportTypeOptions[] = [
                    'value' => $transportAdapterType,
                    'label' => $transportAdapterType::displayName()
                ];
            }
        }

        // Sort them by name
        ArrayHelper::multisort($transportTypeOptions, 'label');

        // See if it looks like config/app.php is overriding the mailer component
        $customMailerFiles = [];
        $configService = Craft::$app->getConfig();
        foreach (['app', 'app.web', 'app.console'] as $file) {
            $config = $configService->getConfigFromFile($file);
            if (isset($config['components']) && array_key_exists('mailer', $config['components'])) {
                $customMailerFiles[] = $configService->getConfigFilePath($file);
            }
        }

        return $this->renderTemplate('settings/email/_index', [
            'settings' => $settings,
            'adapter' => $adapter,
            'transportTypeOptions' => $transportTypeOptions,
            'allTransportAdapters' => $allTransportAdapters,
            'customMailerFiles' => $customMailerFiles,
        ]);
    }

    /**
     * Saves the email settings.
     *
     * @return Response|null
     */
    public function actionSaveEmailSettings()
    {
        $this->requirePostRequest();

        $settings = $this->_createMailSettingsFromPost();
        $settingsAreValid = $settings->validate();

        /** @var BaseTransportAdapter $adapter */
        $adapter = MailerHelper::createTransportAdapter($settings->transportType, $settings->transportSettings);
        $adapterIsValid = $adapter->validate();

        if (!$settingsAreValid || !$adapterIsValid) {
            Craft::$app->getSession()->setError(Craft::t('app', 'Couldn’t save email settings.'));

            // Send the settings back to the template
            Craft::$app->getUrlManager()->setRouteParams([
                'settings' => $settings,
                'adapter' => $adapter
            ]);

            return null;
        }

        Craft::$app->getProjectConfig()->set('email', $settings->toArray());

        Craft::$app->getSession()->setNotice(Craft::t('app', 'Email settings saved.'));
        return $this->redirectToPostedUrl();
    }

    /**
     * Tests the email settings.
     */
    public function actionTestEmailSettings()
    {
        $this->requirePostRequest();

        $settings = $this->_createMailSettingsFromPost();
        $settingsIsValid = $settings->validate();

        /** @var BaseTransportAdapter $adapter */
        $adapter = MailerHelper::createTransportAdapter($settings->transportType, $settings->transportSettings);
        $adapterIsValid = $adapter->validate();

        if ($settingsIsValid && $adapterIsValid) {
            /** @var Mailer $mailer */
            $mailer = Craft::createObject(App::mailerConfig($settings));

            // Compose the settings list as HTML
            $settingsList = '';

            foreach (['fromEmail', 'fromName', 'template'] as $name) {
                if (!empty($settings->$name)) {
                    $settingsList .= '- **' . $settings->getAttributeLabel($name) . ':** ' . $settings->$name . "\n";
                }
            }

            $settingsList .= '- **' . Craft::t('app', 'Transport Type') . ':** ' . $adapter::displayName() . "\n";

            $security = Craft::$app->getSecurity();

            foreach ($adapter->settingsAttributes() as $name) {
                if (!empty($adapter->$name)) {
                    $label = $adapter->getAttributeLabel($name);
                    $value = $security->redactIfSensitive($name, $adapter->$name);
                    $settingsList .= "- **{$label}:** {$value}\n";
                }
            }

            // Try to send the test email
            $message = $mailer
                ->composeFromKey('test_email', ['settings' => $settingsList])
                ->setTo(Craft::$app->getUser()->getIdentity());

            if ($message->send()) {
                Craft::$app->getSession()->setNotice(Craft::t('app', 'Email sent successfully! Check your inbox.'));
            } else {
                Craft::$app->getSession()->setError(Craft::t('app', 'There was an error testing your email settings.'));
            }
        } else {
            Craft::$app->getSession()->setError(Craft::t('app', 'Your email settings are invalid.'));
        }

        // Send the settings back to the template
        Craft::$app->getUrlManager()->setRouteParams([
            'settings' => $settings,
            'adapter' => $adapter
        ]);
    }

    /**
     * Global Set edit form.
     *
     * @param int|null $globalSetId The global set’s ID, if any.
     * @param GlobalSet|null $globalSet The global set being edited, if there were any validation errors.
     * @return Response
     * @throws NotFoundHttpException if the requested global set cannot be found
     */
    public function actionEditGlobalSet(int $globalSetId = null, GlobalSet $globalSet = null): Response
    {
        if ($globalSet === null) {
            if ($globalSetId !== null) {
                $globalSet = Craft::$app->getGlobals()->getSetById($globalSetId);

                if (!$globalSet) {
                    throw new NotFoundHttpException('Global set not found');
                }
            } else {
                $globalSet = new GlobalSet();
            }
        }

        if ($globalSet->id) {
            $title = trim($globalSet->name) ?: Craft::t('app', 'Edit Global Set');
        } else {
            $title = Craft::t('app', 'Create a new global set');
        }

        // Breadcrumbs
        $crumbs = [
            [
                'label' => Craft::t('app', 'Settings'),
                'url' => UrlHelper::url('settings')
            ],
            [
                'label' => Craft::t('app', 'Globals'),
                'url' => UrlHelper::url('settings/globals')
            ]
        ];

        // Tabs
        $tabs = [
            'settings' => [
                'label' => Craft::t('app', 'Settings'),
                'url' => '#set-settings'
            ],
            'fieldlayout' => [
                'label' => Craft::t('app', 'Field Layout'),
                'url' => '#set-fieldlayout'
            ]
        ];

        // Render the template!
        return $this->renderTemplate('settings/globals/_edit', [
            'globalSetId' => $globalSetId,
            'globalSet' => $globalSet,
            'title' => $title,
            'crumbs' => $crumbs,
            'tabs' => $tabs
        ]);
    }

    // Private Methods
    // =========================================================================

    /**
     * Creates a MailSettings model, populated with post data.
     *
     * @return MailSettings
     */
    private function _createMailSettingsFromPost(): MailSettings
    {
        $request = Craft::$app->getRequest();
        $settings = new MailSettings();

        $settings->fromEmail = $request->getBodyParam('fromEmail');
        $settings->fromName = $request->getBodyParam('fromName');
        $settings->template = $request->getBodyParam('template');
        $settings->transportType = $request->getBodyParam('transportType');
        $settings->transportSettings = $request->getBodyParam('transportTypes.' . $settings->transportType);

        return $settings;
    }
}