<?php
/**
 * Settings: defaults, reading and sanitizing (Settings API).
 *
 * @package Hivenza
 */

defined( 'ABSPATH' ) || exit;

/**
 * The address of Hivenza. Fixed; a filter exists for staging only.
 *
 * @return string
 */
function hivenza_origin() {
	return untrailingslashit( esc_url_raw( apply_filters( 'hivenza_origin', 'https://hivenza.com' ) ) );
}

/**
 * Default settings.
 *
 * @return array
 */
function hivenza_defaults() {
	return array(
		'chat_key'        => '',
		'identity_secret' => '',
		'visibility'      => 'all', // all | include | exclude.
		'page_ids'        => array(),
		'home'            => 0,
		'recognise'       => 1,
		'woo'             => 1,
		'consent'         => 0,
		'help_slug'       => '',
	);
}

/**
 * Current settings merged with defaults.
 *
 * @return array
 */
function hivenza_settings() {
	$saved = get_option( HIVENZA_OPTION, array() );
	return wp_parse_args( is_array( $saved ) ? $saved : array(), hivenza_defaults() );
}

/**
 * The identity secret: a constant in wp-config.php wins over the stored option.
 *
 * @return string
 */
function hivenza_identity_secret() {
	if ( defined( 'HIVENZA_SECRET' ) && is_string( HIVENZA_SECRET ) && '' !== HIVENZA_SECRET ) {
		return HIVENZA_SECRET;
	}
	$settings = hivenza_settings();
	return (string) $settings['identity_secret'];
}

/**
 * Keep only a help centre address: accepts "my-brand" or a pasted https://hivenza.com/help/my-brand link.
 *
 * @param string $value Raw value.
 * @return string
 */
function hivenza_clean_slug( $value ) {
	$value = trim( (string) $value );
	if ( preg_match( '#/help/([^/?\#]+)#i', $value, $match ) ) {
		$value = $match[1];
	}
	$value = strtolower( $value );
	return preg_match( '/^[a-z0-9][a-z0-9-]{0,80}$/', $value ) ? $value : '';
}

/**
 * Sanitize the whole option on save.
 *
 * @param mixed $input Submitted values.
 * @return array
 */
function hivenza_sanitize_settings( $input ) {
	$input = is_array( $input ) ? $input : array();
	$old   = hivenza_settings();
	$out   = hivenza_defaults();

	$key = isset( $input['chat_key'] ) ? trim( sanitize_text_field( wp_unslash( $input['chat_key'] ) ) ) : '';
	// A chat key is letters, digits, dashes and underscores.
	$out['chat_key'] = preg_match( '/^[A-Za-z0-9_-]{6,100}$/', $key ) ? $key : '';
	if ( '' === $out['chat_key'] && '' !== $key ) {
		$out['chat_key'] = (string) $old['chat_key']; // Keep the working key.
		add_settings_error( 'hivenza_settings', 'hivenza_key', __( 'That does not look like a chat key. Copy it again from Hivenza (Website chat, Install).', 'hivenza' ) );
	}

	// The secret is never printed back: leave the field empty to keep it.
	$secret = isset( $input['identity_secret'] ) ? trim( sanitize_text_field( wp_unslash( $input['identity_secret'] ) ) ) : '';
	if ( ! empty( $input['remove_secret'] ) ) {
		$out['identity_secret'] = '';
	} elseif ( '' !== $secret ) {
		$out['identity_secret'] = $secret;
	} else {
		$out['identity_secret'] = (string) $old['identity_secret'];
	}

	$visibility        = isset( $input['visibility'] ) ? sanitize_key( $input['visibility'] ) : 'all';
	$out['visibility'] = in_array( $visibility, array( 'all', 'include', 'exclude' ), true ) ? $visibility : 'all';
	$out['page_ids']   = isset( $input['page_ids'] ) && is_array( $input['page_ids'] ) ? array_values( array_unique( array_filter( array_map( 'absint', $input['page_ids'] ) ) ) ) : array();
	$out['home']       = empty( $input['home'] ) ? 0 : 1;
	$out['recognise']  = empty( $input['recognise'] ) ? 0 : 1;
	$out['woo']        = empty( $input['woo'] ) ? 0 : 1;
	$out['consent']    = empty( $input['consent'] ) ? 0 : 1;
	$out['help_slug']  = hivenza_clean_slug( isset( $input['help_slug'] ) ? wp_unslash( $input['help_slug'] ) : '' );
	return $out;
}

/**
 * Register the option with the Settings API.
 */
function hivenza_register_settings() {
	register_setting(
		'hivenza_settings_group',
		HIVENZA_OPTION,
		array(
			'type'              => 'array',
			'sanitize_callback' => 'hivenza_sanitize_settings',
			'default'           => hivenza_defaults(),
			'show_in_rest'      => false,
		)
	);
}
add_action( 'admin_init', 'hivenza_register_settings' );