<?php
/**
 * The personal data a button may ask for (name, e-mail, message) in WordPress's own privacy
 * tools: Tools → Export Personal Data and Erase Personal Data find a payer by e-mail, and the
 * privacy policy guide gets a paragraph to copy.
 *
 * @package CryptowayButton
 */

namespace CryptowayButton;

defined( 'ABSPATH' ) || exit;

final class Privacy {

    private const PER_PAGE = 50;

    private function __construct() {}

    public static function register(): void {
        add_filter( 'wp_privacy_personal_data_exporters', [ self::class, 'exporters' ] );
        add_filter( 'wp_privacy_personal_data_erasers', [ self::class, 'erasers' ] );
        add_action( 'admin_init', [ self::class, 'policy_text' ] );
    }

    public static function exporters( $exporters ): array {
        $exporters = is_array( $exporters ) ? $exporters : [];

        $exporters['cryptoway-button'] = [
            'exporter_friendly_name' => __( 'Cryptoway payments', 'cryptoway-button' ),
            'callback'               => [ self::class, 'export' ],
        ];

        return $exporters;
    }

    public static function erasers( $erasers ): array {
        $erasers = is_array( $erasers ) ? $erasers : [];

        $erasers['cryptoway-button'] = [
            'eraser_friendly_name' => __( 'Cryptoway payments', 'cryptoway-button' ),
            'callback'             => [ self::class, 'erase' ],
        ];

        return $erasers;
    }

    /**
     * The payments made with an e-mail: what they were for, the amount, the status and what the
     * payer typed.
     */
    public static function export( string $email, int $page = 1 ): array {
        $payments = Payment::find_by_email( $email, $page, self::PER_PAGE );
        $items    = [];

        foreach ( $payments as $payment ) {
            $data = [
                [ 'name' => __( 'Payment', 'cryptoway-button' ), 'value' => '#' . $payment->id() ],
                [ 'name' => __( 'For', 'cryptoway-button' ), 'value' => $payment->title() ],
                [ 'name' => __( 'Amount', 'cryptoway-button' ), 'value' => Amounts::fiat( $payment->amount(), $payment->currency() ) ],
                [ 'name' => __( 'Status', 'cryptoway-button' ), 'value' => $payment->status_label_now() ],
                [ 'name' => __( 'Started', 'cryptoway-button' ), 'value' => Admin::format_time( $payment->created_at() ) ],
            ];

            foreach ( $payment->payer() as $field => $value ) {
                $data[] = [
                    'name'  => match ( $field ) {
                        'name'  => __( 'Name', 'cryptoway-button' ),
                        'email' => __( 'E-mail', 'cryptoway-button' ),
                        default => __( 'Message', 'cryptoway-button' ),
                    },
                    'value' => $value,
                ];
            }

            $items[] = [
                'group_id'    => 'cryptoway-button-payments',
                'group_label' => __( 'Cryptoway payments', 'cryptoway-button' ),
                'item_id'     => 'cryptoway-button-payment-' . $payment->id(),
                'data'        => $data,
            ];
        }

        return [ 'data' => $items, 'done' => count( $payments ) < self::PER_PAGE ];
    }

    /**
     * Remove what the payer typed (name, e-mail, message) from their payments. The payments stay:
     * they are the site's record of money received.
     */
    public static function erase( string $email, int $page = 1 ): array {
        // Always the first page: erased payments no longer match the e-mail.
        $payments = Payment::find_by_email( $email, 1, self::PER_PAGE );

        foreach ( $payments as $payment ) {
            $payment->delete_meta( Payment::META_PAYER );
            $payment->delete_meta( Payment::META_PAYER_EMAIL );
            $payment->add_history( __( 'The payer\'s details were erased on a personal data request.', 'cryptoway-button' ) );
        }

        return [
            'items_removed'  => count( $payments ) > 0,
            'items_retained' => false,
            'messages'       => [],
            'done'           => count( $payments ) < self::PER_PAGE,
        ];
    }

    /** A paragraph for Settings → Privacy → the policy guide. */
    public static function policy_text(): void {
        if ( ! function_exists( 'wp_add_privacy_policy_content' ) ) {
            return;
        }

        wp_add_privacy_policy_content(
            'Cryptoway Payment',
            wp_kses_post( wpautop( __( 'When you pay with a Cryptoway Payment button, this site keeps a record of the payment: what it was for, the amount, the coin, the transaction and its status. If the button asks for your name, e-mail or a message, they are kept with that record on this site and are not sent to Cryptoway. Your e-mail is used to send you the link to content you paid for. The payment itself is processed by Cryptoway (cryptoway.com) under its own terms and privacy policy.', 'cryptoway-button' ) ) )
        );
    }
}