<?php
defined( 'ABSPATH' ) || exit;

/**
 * Plugin settings merged over the defaults.
 */
function beon_notify_settings() {
	$defaults = array(
		'api_token'     => '',
		'endpoint_url'  => 'https://v3.api.beon.chat/api/partner/messages/whatsapp/template',
		'templates_url' => 'https://v3.api.beon.chat/api/partner/templates',
		'country_code'  => '20',
		'admin_phones'  => '',
		'use_queue'     => 1,
		'debug_log'     => 1,
		'log_days'      => 30,
		'woo_rules'     => array(),
		'form_rules'    => array(),
		'form_sources'  => null,
	);

	$saved = get_option( 'beon_notify_settings', array() );
	$s     = wp_parse_args( is_array( $saved ) ? $saved : array(), $defaults );

	// The first builds guessed the list address; BeOn's partner API lists templates at /api/partner/templates.
	if ( 'https://v3.api.beon.chat/api/v3/template' === $s['templates_url'] ) {
		$s['templates_url'] = $defaults['templates_url'];
	}

	$s['woo_rules'] = beon_notify_rule_list( $s['woo_rules'] );

	// Form rules ("source:id"). Rules saved as `nf_rules` (Ninja Forms only) become "nf:{id}".
	$form_rules = (array) $s['form_rules'];
	if ( ! $form_rules && ! empty( $saved['nf_rules'] ) ) {
		foreach ( (array) $saved['nf_rules'] as $rule ) {
			$rule         = (array) $rule;
			$rule['form'] = 'nf:' . (int) ( $rule['form_id'] ?? 0 );
			$form_rules[] = $rule;
		}
	}
	$s['form_rules'] = array_values(
		array_map(
			static function ( $rule ) {
				return wp_parse_args(
					array_intersect_key( (array) $rule, array_flip( array( 'id', 'form', 'phone_field', 'name_field', 'recipients', 'template_id', 'variables', 'enabled' ) ) ),
					array(
						'enabled'     => 1,
						'id'          => '',
						'form'        => '',
						'phone_field' => '',
						'name_field'  => '',
						'recipients'  => 'visitor',
						'template_id' => 0,
						'variables'   => '',
					)
				);
			},
			$form_rules
		)
	);

	// Connected form plugins. Never chosen yet (older settings): the plugins that already have rules.
	if ( ! is_array( $s['form_sources'] ) ) {
		$s['form_sources'] = array();
		foreach ( $s['form_rules'] as $rule ) {
			$s['form_sources'][] = strtok( (string) $rule['form'], ':' );
		}
	}
	$s['form_sources'] = array_values( array_unique( array_filter( array_map( 'sanitize_key', $s['form_sources'] ) ) ) );

	return $s;
}

/**
 * WooCommerce rules as a list of {id, event, recipients, template_id, variables}.
 *
 * Also reads the 1.0 format (one rule per event, keyed by event, with an
 * `enabled` flag): enabled rules keep the event as their id, so orders already
 * messaged under 1.0 aren't messaged again.
 */
function beon_notify_rule_list( $rules ) {
	$list = array();

	foreach ( (array) $rules as $key => $rule ) {
		$rule = (array) $rule;

		if ( ! isset( $rule['event'] ) ) {
			if ( empty( $rule['enabled'] ) || ! is_string( $key ) ) {
				continue;
			}
			$rule['event'] = $key;
			$rule['id']    = $key;
		}

		$list[] = array(
			'id'          => (string) ( $rule['id'] ?? '' ),
			'event'       => (string) $rule['event'],
			'recipients'  => (string) ( $rule['recipients'] ?? 'customer' ),
			'template_id' => (int) ( $rule['template_id'] ?? 0 ),
			'variables'   => (string) ( $rule['variables'] ?? '' ),
		);
	}

	return $list;
}

/**
 * Normalises a phone number to international digits without "+" (e.g. 201001234567).
 *
 * Local numbers starting with a single 0 (Egypt: 01xxxxxxxxx) get the default
 * country code; "00" prefixes are treated as international.
 */
function beon_notify_normalize_phone( $phone, $country_code = null ) {
	$digits = preg_replace( '/\D+/', '', (string) $phone );

	if ( '' === $digits ) {
		return '';
	}

	if ( null === $country_code ) {
		$country_code = beon_notify_settings()['country_code'];
	}
	$country_code = preg_replace( '/\D+/', '', (string) $country_code );

	if ( 0 === strpos( $digits, '00' ) ) {
		$digits = substr( $digits, 2 );
	} elseif ( '' !== $country_code && 0 === strpos( $digits, '0' ) ) {
		$digits = $country_code . substr( $digits, 1 );
	} elseif ( '' !== $country_code && strlen( $digits ) <= 10 && 0 !== strpos( $digits, $country_code ) ) {
		$digits = $country_code . $digits;
	}

	if ( strlen( $digits ) < 8 || strlen( $digits ) > 15 ) {
		return '';
	}

	return $digits;
}

/**
 * Splits a textarea (one entry per line) into trimmed non-empty lines.
 */
function beon_notify_lines( $text ) {
	$lines = preg_split( '/\r\n|\r|\n/', (string) $text );

	return array_values( array_filter( array_map( 'trim', $lines ), 'strlen' ) );
}

/**
 * Replaces {placeholders} in a string from a key => value map.
 */
function beon_notify_fill( $text, array $vars ) {
	return preg_replace_callback(
		'/\{([a-z0-9_:\-]+)\}/i',
		static function ( $m ) use ( $vars ) {
			return array_key_exists( $m[1], $vars ) ? (string) $vars[ $m[1] ] : '';
		},
		(string) $text
	);
}

/**
 * Writes to the WooCommerce log when available, else the PHP error log.
 */
function beon_notify_log( $message, $level = 'info' ) {
	if ( empty( beon_notify_settings()['debug_log'] ) && 'error' !== $level ) {
		return;
	}

	if ( function_exists( 'wc_get_logger' ) ) {
		wc_get_logger()->log( $level, $message, array( 'source' => 'beon-chat' ) );
		return;
	}

	error_log( '[beon-chat] ' . $level . ': ' . $message ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions
}