<?php

namespace HTML_Forms\Admin;

use HTML_Forms\Submission;

class GDPR {
	public function hook() {
		add_filter( 'wp_privacy_personal_data_exporters', array( $this, 'register_exporter' ), 90 );
		add_filter( 'wp_privacy_personal_data_erasers', array( $this, 'register_eraser' ), 90 );
	}

	public function register_exporter( $exporters ) {
		$exporters['html-forms'] = array(
			'exporter_friendly_name' => 'HTML Forms',
			'callback'               => array( $this, 'export' ),
		);
		return $exporters;
	}

	public function register_eraser( $erasers ) {
		$erasers['html-forms'] = array(
			'eraser_friendly_name' => 'HTML Forms',
			'callback'             => array( $this, 'erase' ),
		);
		return $erasers;
	}

	public function export( $email_address, $page = 1 ) {
		$submissions    = $this->find_submissions_for_email_address( $email_address );
		$data_to_export = array();

		foreach ( $submissions as $s ) {
			$data_to_export[] = array(
				'group_id'    => 'html_forms_submissions',
				'group_label' => __( 'Form submissions', 'html-forms' ),
				'item_id'     => sprintf( 'html-forms-submission-%d', $s->id ),
				'data'        => $this->export_submission( $s ),
			);
		}

		return array(
			'data' => $data_to_export,
			'done' => true,
		);
	}

	public function export_submission( Submission $submission ) {
		$data = array(
			array(
				'name'  => 'Submitted at',
				'value' => $submission->submitted_at,
			),
		);

		if ( ! empty( $submission->ip_address ) ) {
			$data[] = array(
				'name'  => 'IP address',
				'value' => $submission->ip_address,
			);
		}

		if ( ! empty( $submission->user_agent ) ) {
			$data[] = array(
				'name'  => 'User agent',
				'value' => $submission->user_agent,
			);
		}

		foreach ( $submission->data as $field => $value ) {
			$data[] = array(
				'name'  => $field,
				'value' => is_array( $value ) ? join( ', ', $value ) : $value,
			);
		}

		return $data;
	}

	public function erase( $email_address, $page = 1 ) {
		global $wpdb;
		$table = $wpdb->prefix . 'hf_submissions';

		$items_removed = false;
		$submissions   = $this->find_submissions_for_email_address( $email_address );
		foreach ( $submissions as $submission ) {
			$wpdb->delete( $table, array( 'id' => $submission->id ) );
			$items_removed = true;
		}

		return array(
			'items_removed'  => $items_removed,
			'items_retained' => false,
			'messages'       => array(),
			'done'           => true,
		);
	}

	private function find_submissions_for_email_address( $email_address ) {
		global $wpdb;
		$table   = $wpdb->prefix . 'hf_submissions';
		$like    = '%"' . $email_address . '"%';
		$results = $wpdb->get_results( $wpdb->prepare( "SELECT s.* FROM {$table} s WHERE s.data LIKE %s ORDER BY s.submitted_at DESC", $like ), OBJECT_K );

		$submissions = array();
		foreach ( $results as $key => $object ) {
			$submission          = Submission::from_object( $object );
			$submissions[ $key ] = $submission;
		}

		return $submissions;
	}
}