<?php

namespace wpdFormAttr\Tools;

use wpdFormAttr\FormConst\wpdFormConst;
use wpdFormAttr\Form;

class PersonalDataExporter implements wpdFormConst {

    private static $_instance = null;
    private $generalOptions;
    private $fields = [];

    private function __construct($options) {
        $this->generalOptions = $options;
        $this->initFormsFields();
        add_filter("wp_privacy_personal_data_exporters", [&$this, "wpdiscuzCommentsPersonalDataExport"], 13);
    }

    private function initFormsFields() {
        $forms = get_posts(["numberposts" => -1, "post_type" => self::WPDISCUZ_FORMS_CONTENT_TYPE]);
        if ($forms) {
            foreach ($forms as $k => $form) {
                $wpdiscuzForm = new Form($this->generalOptions, $form->ID);
                $wpdiscuzForm->initFormFields();
                $formFields = $wpdiscuzForm->getFormCustomFields();
                if ($formFields) {
                    $this->fields = array_merge($this->fields, $formFields);
                }
            }
        }
    }

    public function wpdiscuzCommentsPersonalDataExport($exporters) {
        $exporters["wpdiscuz"] = [
            "exporter_friendly_name" => esc_html__("wpDiscuz Fields Data", "wpdiscuz"),
            "callback"               => [&$this, "customFieldsExport"],
        ];
        return $exporters;
    }

    public function customFieldsExport($email_address, $page = 1) {
        $number       = 500; // Limit us to avoid timing out
        $page         = (int)$page;
        $done         = true;
        $export_items = [];

        $doExport = apply_filters("wpdiscuz_do_export_personal_data", false);

        if ($this->fields || $doExport) {
            $comments = get_comments(
                [
                    "author_email" => $email_address,
                    "number"       => $number,
                    "paged"        => $page,
                    "order_by"     => "comment_ID",
                    "order"        => "ASC",
                ]
            );


            foreach ((array)$comments as $k => $comment) {
                $commentId   = $comment->comment_ID;
                $data        = [];
                $commentMeta = get_metadata("comment", $commentId);
                foreach ($this->fields as $key => $field) {
                    if (isset($commentMeta[$key])) {
                        $value = $this->generateFieldData($commentMeta[$key][0]);
                        if (empty($value)) {
                            continue;
                        }
                        $data[] = [
                            "name"  => $field["name"],
                            "value" => $value,
                        ];
                    }
                }
                $data = apply_filters("wpdiscuz_privacy_personal_data_export", $data, $commentId);
                if ($data) {
                    $export_items[] = [
                        "group_id"    => "comments",
                        "group_label" => esc_html__("Comments"),
                        "item_id"     => "comment-$commentId",
                        "data"        => $data,
                    ];
                }
            }
            $done = count($comments) < $number;
        }
        return [
            "data" => $export_items,
            "done" => $done,
        ];
    }

    private function generateFieldData($data) {
        $value = "";
        $data  = maybe_unserialize($data);
        if (empty($data)) {
            return "";
        }
        if (is_array($data)) {
            $value = implode(", ", $data);
        } else {
            $value = $data;
        }
        return $value;
    }

    public static function getInstance($options) {
        if (is_null(self::$_instance)) {
            self::$_instance = new self($options);
        }
        return self::$_instance;
    }

}
