<?php
/**
 * AI Content Signals - Export/Import Settings
 *
 * Handles exporting and importing plugin configuration as JSON.
 *
 * @package AIContentSignals
 * @since   1.2.0
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Handle settings export
 *
 * Generates a JSON file download with all plugin settings.
 */
function ayudawp_acs_handle_export() {
	if ( ! isset( $_GET['ayudawp_acs_export'] ) || '1' !== $_GET['ayudawp_acs_export'] ) {
		return;
	}

	if ( ! current_user_can( 'manage_options' ) ) {
		wp_die( esc_html__( 'You do not have permission to export settings.', 'ai-content-signals' ) );
	}

	if ( ! isset( $_GET['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_GET['_wpnonce'] ) ), 'ayudawp_acs_export' ) ) {
		wp_die( esc_html__( 'Security check failed.', 'ai-content-signals' ) );
	}

	$settings = get_option( 'ayudawp_acs_settings', array() );

	$export_data = array(
		'plugin'   => 'ai-content-signals',
		'version'  => AYUDAWP_ACS_VERSION,
		'exported' => gmdate( 'Y-m-d H:i:s' ) . ' UTC',
		'settings' => $settings,
	);

	$filename = 'ai-content-signals-' . gmdate( 'Y-m-d' ) . '.json';

	nocache_headers();
	header( 'Content-Type: application/json; charset=utf-8' );
	header( 'Content-Disposition: attachment; filename=' . $filename );
	header( 'Expires: 0' );

	echo wp_json_encode( $export_data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE );
	exit;
}
add_action( 'admin_init', 'ayudawp_acs_handle_export' );

/**
 * Handle settings import
 *
 * Processes an uploaded JSON file and restores plugin settings.
 */
function ayudawp_acs_handle_import() {
	if ( ! isset( $_POST['ayudawp_acs_import'] ) || '1' !== $_POST['ayudawp_acs_import'] ) {
		return;
	}

	if ( ! current_user_can( 'manage_options' ) ) {
		wp_die( esc_html__( 'You do not have permission to import settings.', 'ai-content-signals' ) );
	}

	if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['_wpnonce'] ) ), 'ayudawp_acs_import' ) ) {
		wp_die( esc_html__( 'Security check failed.', 'ai-content-signals' ) );
	}

	if ( ! isset( $_FILES['ayudawp_acs_import_file']['error'] ) || UPLOAD_ERR_OK !== $_FILES['ayudawp_acs_import_file']['error'] ) {
		add_settings_error(
			'ayudawp_acs',
			'import_error',
			esc_html__( 'No file uploaded or upload error occurred.', 'ai-content-signals' ),
			'error'
		);
		return;
	}

	// Validate file type.
	$file_name = isset( $_FILES['ayudawp_acs_import_file']['name'] )
		? sanitize_file_name( wp_unslash( $_FILES['ayudawp_acs_import_file']['name'] ) )
		: '';

	$file_type = wp_check_filetype(
		$file_name,
		array( 'json' => 'application/json' )
	);
	if ( 'json' !== $file_type['ext'] ) {
		add_settings_error(
			'ayudawp_acs',
			'import_error',
			esc_html__( 'Invalid file type. Please upload a JSON file.', 'ai-content-signals' ),
			'error'
		);
		return;
	}

	// Read file contents.
	$tmp_name = isset( $_FILES['ayudawp_acs_import_file']['tmp_name'] )
		? sanitize_text_field( $_FILES['ayudawp_acs_import_file']['tmp_name'] )
		: '';

	if ( empty( $tmp_name ) ) {
		add_settings_error(
			'ayudawp_acs',
			'import_error',
			esc_html__( 'Could not read the uploaded file.', 'ai-content-signals' ),
			'error'
		);
		return;
	}

	// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
	$file_contents = file_get_contents( $tmp_name );

	if ( false === $file_contents ) {
		add_settings_error(
			'ayudawp_acs',
			'import_error',
			esc_html__( 'Could not read the uploaded file.', 'ai-content-signals' ),
			'error'
		);
		return;
	}

	$import_data = json_decode( $file_contents, true );

	if ( null === $import_data || ! is_array( $import_data ) ) {
		add_settings_error(
			'ayudawp_acs',
			'import_error',
			esc_html__( 'Invalid JSON file. Could not parse the file contents.', 'ai-content-signals' ),
			'error'
		);
		return;
	}

	// Validate it's an AI Content Signals export.
	if ( ! isset( $import_data['plugin'] ) || 'ai-content-signals' !== $import_data['plugin'] ) {
		add_settings_error(
			'ayudawp_acs',
			'import_error',
			esc_html__( 'Invalid export file. This does not appear to be an AI Content Signals configuration file.', 'ai-content-signals' ),
			'error'
		);
		return;
	}

	if ( ! isset( $import_data['settings'] ) || ! is_array( $import_data['settings'] ) ) {
		add_settings_error(
			'ayudawp_acs',
			'import_error',
			esc_html__( 'Invalid export file. No settings data found.', 'ai-content-signals' ),
			'error'
		);
		return;
	}

	// Sanitize imported settings through the existing sanitize callback.
	$sanitized_settings = ayudawp_acs_sanitize_settings( $import_data['settings'] );

	// Update settings.
	update_option( 'ayudawp_acs_settings', $sanitized_settings );

	// Redirect to avoid form resubmission and show success notice.
	set_transient( 'ayudawp_acs_notice', 'imported', 30 );
	wp_safe_redirect(
		admin_url( 'options-general.php?page=ai-content-signals' )
	);
	exit;
}
add_action( 'admin_init', 'ayudawp_acs_handle_import' );

/**
 * Handle restore defaults
 *
 * Resets all plugin settings to their default values.
 */
function ayudawp_acs_handle_restore_defaults() {
	if ( ! isset( $_POST['ayudawp_acs_restore_defaults'] ) || '1' !== $_POST['ayudawp_acs_restore_defaults'] ) {
		return;
	}

	if ( ! current_user_can( 'manage_options' ) ) {
		wp_die( esc_html__( 'You do not have permission to restore settings.', 'ai-content-signals' ) );
	}

	if ( ! isset( $_POST['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['_wpnonce'] ) ), 'ayudawp_acs_restore_defaults' ) ) {
		wp_die( esc_html__( 'Security check failed.', 'ai-content-signals' ) );
	}

	$current = get_option( 'ayudawp_acs_settings', array() );

	$defaults = array(
		'global_search'          => 'yes',
		'global_ai_input'        => 'yes',
		'global_ai_train'        => 'yes',
		'include_legal_text'     => 'yes',
		// Carried over rather than reset where the checkbox is not shown, for
		// the reason documented in ayudawp_acs_sanitize_physical_robots_toggle().
		'create_physical_robots' => ayudawp_acs_sanitize_physical_robots_toggle( array(), is_array( $current ) ? $current : array() ),
		'emit_meta_tags'         => 'no',
		'emit_http_headers'      => 'no',
		'emit_tdmrep'            => 'no',
		'bot_settings'           => array(),
		'custom_bots'            => array(),
	);

	update_option( 'ayudawp_acs_settings', $defaults );

	set_transient( 'ayudawp_acs_notice', 'restored', 30 );
	wp_safe_redirect(
		admin_url( 'options-general.php?page=ai-content-signals' )
	);
	exit;
}
add_action( 'admin_init', 'ayudawp_acs_handle_restore_defaults' );

/**
 * Display admin notices for import/restore actions
 */
function ayudawp_acs_action_notices() {
	$screen = get_current_screen();
	if ( ! $screen || 'settings_page_ai-content-signals' !== $screen->id ) {
		return;
	}

	$notice = get_transient( 'ayudawp_acs_notice' );
	if ( ! $notice ) {
		return;
	}

	delete_transient( 'ayudawp_acs_notice' );

	if ( 'imported' === $notice ) {
		echo '<div class="notice notice-success is-dismissible"><p>';
		esc_html_e( 'Settings imported successfully.', 'ai-content-signals' );
		echo '</p></div>';
	} elseif ( 'restored' === $notice ) {
		echo '<div class="notice notice-success is-dismissible"><p>';
		esc_html_e( 'Settings restored to defaults.', 'ai-content-signals' );
		echo '</p></div>';
	}
}
add_action( 'admin_notices', 'ayudawp_acs_action_notices' );