<?php

namespace FluentForm\App\Modules\Form;

use FluentForm\App\Helpers\Helper;
use FluentForm\Framework\Request\File;
use FluentForm\Framework\Helpers\ArrayHelper;
use FluentForm\Framework\Foundation\Application;

class Transfer
{
    /**
     * @var \FluentForm\Framework\Request\Request $request
     */
    protected $request;

    /**
     * Transfer constructor.
     *
     * @param \FluentForm\Framework\Foundation\Application $application
     */
    public function __construct(Application $application)
    {
        $this->request = $application->make('request');
    }

    /**
     * Export forms as JSON.
     */
    public function export()
    {
        // Get the IDs of the forms the user wants to be exported.
        $formIds = $this->request->get('forms');

        // The associated form settings the user wants to be exported as well.
        // Firing an event so that others can hook into it and add their
        // choice of the settings to be exported with the form.
        $metaKeys = apply_filters('fluentform_export_settings', [
            'formSettings',
            'notifications',
            'mailchimp_feeds',
            'slack'
        ]);

        // Load the forms for a given form IDs and the settings from the DB.
        $result = wpFluent()->table('fluentform_forms')
                            ->select(['fluentform_forms.*'])
                            ->whereIn('fluentform_forms.id', $formIds)
                            ->when($metaKeys, function ($query) use ($metaKeys) {
                                $query->select([
                                    'fluentform_form_meta.meta_key',
                                    'fluentform_form_meta.value'
                                ])->join(
                                    'fluentform_form_meta',
                                    'fluentform_form_meta.form_id',
                                    '=',
                                    'fluentform_forms.id'
                                )->whereIn('fluentform_form_meta.meta_key', $metaKeys);
                            })
                            ->get();

        // Prepare the loaded query results to form and it's settings objects.
        $forms = [];
        foreach ($result as $item) {
            $form = isset($forms[$item->id]) ? $forms[$item->id] : [
                'id'    => $item->id,
                'title' => $item->title,
                'form'  => json_decode($item->form_fields)
            ];

            $settings = [
                $item->meta_key => Helper::isJson($item->value) ? json_decode($item->value) : $item->value
            ];

            $forms[$item->id] = array_merge($form, $settings);
        }

        $fileName = 'fluentform-export-forms-'.date('d-m-Y').'.json';

        header('Content-disposition: attachment; filename='.$fileName);

        header('Content-type: application/json');

        echo json_encode(array_values($forms));

        die();
    }

    /**
     * Import forms from a previously exported JSON file.
     */
    public function import()
    {
        $file = $this->request->get('file');

        if ($file instanceof File) {
            $forms = json_decode($file->getContents(), true);

            if ($forms && is_array($forms)) {
                foreach ($forms as $formItem) {
                    // First of all make the form object.
                    $form = [
                        'title'       => ArrayHelper::get($formItem, 'title'),
                        'form_fields' => json_encode(ArrayHelper::get($formItem, 'form', '')),
                        'created_by'  => get_current_user_id()
                    ];

                    // Insert the form to the DB.
                    $formId = wpFluent()->table('fluentform_forms')->insert($form);

                    // Remove the form object specific keys.
                    unset($formItem['title']);
                    unset($formItem['id']);
                    unset($formItem['form']);

                    // At this point all we have are the
                    // settings associated with the form.
                    $settings = [];
                    foreach ($formItem as $settingsName => $settingsValue) {
                        $settings[] = [
                            'form_id'  => $formId,
                            'meta_key' => $settingsName,
                            'value'    => json_encode($settingsValue)
                        ];
                    }

                    // Fire an event letting others know which settings we are importing for this form.
                    $settings = apply_filters('fluentform_import_form_settings', $settings, $formId);

                    if (count($settings)) {
                        wpFluent()->table('fluentform_form_meta')->insert($settings);
                    }
                }

                wp_send_json([
                    'message' => __('You form has been successfully imported.', 'fluentform')
                ], 200);
            }
        }

        wp_send_json([
            'message' => __('You have a faulty JSON file, please export the Fluent Forms again.', 'fluentform')
        ], 423);
    }
}