<?php
/**
 * Personal data export and erasure integration.
 *
 * @package ActionPanelAI
 */

namespace ActionPanelAI\Admin;

use ActionPanelAI\Support\PrivacyApiClient;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Registers ActionPanel AI with WordPress privacy tools.
 */
class PrivacyDataHooks {
	private const GROUP_ID = 'actionpanel-ai';

	/**
	 * Create privacy hooks with the remote privacy API client.
	 *
	 * @param PrivacyApiClient $privacy_api_client Client for remote privacy requests.
	 */
	public function __construct(
		private PrivacyApiClient $privacy_api_client
	) {
	}

	/**
	 * Register exporter and eraser filters.
	 */
	public function register(): void {
		add_filter( 'wp_privacy_personal_data_exporters', array( $this, 'register_exporter' ) );
		add_filter( 'wp_privacy_personal_data_erasers', array( $this, 'register_eraser' ) );
	}

	/**
	 * Add the ActionPanel AI personal data exporter.
	 *
	 * @param array $exporters Existing WordPress exporters.
	 */
	public function register_exporter( array $exporters ): array {
		$exporters[ self::GROUP_ID ] = array(
			'exporter_friendly_name' => __( 'ActionPanel AI Data', 'actionpanel-ai' ),
			'callback'               => array( $this, 'export_personal_data' ),
		);

		return $exporters;
	}

	/**
	 * Add the ActionPanel AI personal data eraser.
	 *
	 * @param array $erasers Existing WordPress erasers.
	 */
	public function register_eraser( array $erasers ): array {
		$erasers[ self::GROUP_ID ] = array(
			'eraser_friendly_name' => __( 'ActionPanel AI Data', 'actionpanel-ai' ),
			'callback'             => array( $this, 'erase_personal_data' ),
		);

		return $erasers;
	}

	/**
	 * Export remote ActionPanel AI data for a site-scoped email address.
	 *
	 * @param string $email_address Email address being exported.
	 * @param int    $page          Export pagination page.
	 */
	public function export_personal_data( string $email_address, int $page = 1 ): array {
		if ( $page > 1 ) {
			return array(
				'data' => array(),
				'done' => true,
			);
		}

		$response = $this->privacy_api_client->export_by_email( $email_address, home_url( '/' ) );

		if ( ! $response['ok'] ) {
			return array(
				'data' => array(
					$this->build_export_item(
						'error',
						array(
							array(
								'name'  => __( 'Status', 'actionpanel-ai' ),
								'value' => __( 'Could not retrieve remote ActionPanel AI data at this time.', 'actionpanel-ai' ),
							),
							array(
								'name'  => __( 'Details', 'actionpanel-ai' ),
								'value' => esc_html( (string) $response['error'] ),
							),
						)
					),
				),
				'done' => true,
			);
		}

		$data = isset( $response['data']['data'] ) && is_array( $response['data']['data'] )
			? $response['data']['data']
			: array();

		$items = array();

		$account_found = ! empty( $data['account_found'] );
		$user          = isset( $data['user'] ) && is_array( $data['user'] ) ? $data['user'] : array();
		$conversations = isset( $data['conversations'] ) && is_array( $data['conversations'] ) ? $data['conversations'] : array();

		if ( $account_found && ! empty( $user ) ) {
			$items[] = $this->build_export_item(
				'account',
				array(
					array(
						'name'  => __( 'Email', 'actionpanel-ai' ),
						'value' => esc_html( (string) ( $user['email'] ?? '' ) ),
					),
					array(
						'name'  => __( 'User ID', 'actionpanel-ai' ),
						'value' => esc_html( (string) ( $user['user_id'] ?? '' ) ),
					),
				)
			);
		}

		foreach ( $conversations as $entry ) {
			$conversation    = is_array( $entry['conversation'] ?? null ) ? $entry['conversation'] : array();
			$messages        = is_array( $entry['messages'] ?? null ) ? $entry['messages'] : array();
			$conversation_id = (string) ( $conversation['conversation_id'] ?? 'unknown' );

			$items[] = $this->build_export_item(
				'conversation-' . $conversation_id,
				array(
					array(
						'name'  => __( 'Conversation ID', 'actionpanel-ai' ),
						'value' => esc_html( $conversation_id ),
					),
					array(
						'name'  => __( 'Title', 'actionpanel-ai' ),
						'value' => esc_html( (string) ( $conversation['title'] ?? '' ) ),
					),
					array(
						'name'  => __( 'Source', 'actionpanel-ai' ),
						'value' => esc_html( (string) ( $conversation['source'] ?? '' ) ),
					),
					array(
						'name'  => __( 'Site Host', 'actionpanel-ai' ),
						'value' => esc_html( (string) ( $conversation['site_host'] ?? '' ) ),
					),
					array(
						'name'  => __( 'Messages', 'actionpanel-ai' ),
						'value' => esc_html( wp_json_encode( $messages ) ),
					),
				)
			);
		}

		if ( empty( $items ) ) {
			$items[] = $this->build_export_item(
				'none',
				array(
					array(
						'name'  => __( 'Status', 'actionpanel-ai' ),
						'value' => __( 'No ActionPanel AI remote data found for this email on this site.', 'actionpanel-ai' ),
					),
				)
			);
		}

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

	/**
	 * Erase remote ActionPanel AI data for a site-scoped email address.
	 *
	 * @param string $email_address Email address being erased.
	 * @param int    $page          Eraser pagination page.
	 */
	public function erase_personal_data( string $email_address, int $page = 1 ): array {
		if ( $page > 1 ) {
			return array(
				'items_removed'  => false,
				'items_retained' => false,
				'messages'       => array(),
				'done'           => true,
			);
		}

		$response = $this->privacy_api_client->erase_by_email( $email_address, home_url( '/' ) );

		if ( ! $response['ok'] ) {
			return array(
				'items_removed'  => false,
				'items_retained' => true,
				'messages'       => array(
					sprintf(
						/* translators: %s: error details */
						__( 'ActionPanel AI remote erase failed: %s', 'actionpanel-ai' ),
						esc_html( (string) $response['error'] )
					),
				),
				'done'           => true,
			);
		}

		$deleted = isset( $response['data']['deleted'] ) && is_array( $response['data']['deleted'] )
			? $response['data']['deleted']
			: array();

		$account_found         = ! empty( $deleted['account_found'] );
		$deleted_conversations = (int) ( $deleted['deleted_conversations'] ?? 0 );

		$messages = array();
		if ( ! $account_found ) {
			$messages[] = __( 'No ActionPanel AI remote account data found for this email on this site.', 'actionpanel-ai' );
		} elseif ( $deleted_conversations > 0 ) {
			$messages[] = sprintf(
				/* translators: %d: number of deleted conversations */
				__( 'Removed %d ActionPanel AI conversation(s) for this site.', 'actionpanel-ai' ),
				$deleted_conversations
			);
		} else {
			$messages[] = __( 'No site-scoped ActionPanel AI conversations needed deletion.', 'actionpanel-ai' );
		}

		return array(
			'items_removed'  => $deleted_conversations > 0,
			'items_retained' => false,
			'messages'       => $messages,
			'done'           => true,
		);
	}

	/**
	 * Build a WordPress personal data export item.
	 *
	 * @param string $id_suffix Stable item suffix.
	 * @param array  $fields    Export fields for the item.
	 */
	private function build_export_item( string $id_suffix, array $fields ): array {
		return array(
			'group_id'    => self::GROUP_ID,
			'group_label' => __( 'ActionPanel AI', 'actionpanel-ai' ),
			'item_id'     => self::GROUP_ID . '-' . sanitize_key( $id_suffix ),
			'data'        => $fields,
		);
	}
}