<?php
/**
 * Shared helpers.
 */

defined( 'ABSPATH' ) || exit;

/**
 * Read a plugin option, falling back to $default when empty.
 */
function codg_opt( $key, $default = '' ) {
	$value = get_option( 'codg_' . $key, null );
	return ( null === $value || '' === $value ) ? $default : $value;
}

/**
 * Read a list option (one item per line or comma separated).
 */
function codg_list( $key ) {
	$items = preg_split( '/[\r\n,]+/', (string) get_option( 'codg_' . $key, '' ) );
	return array_values( array_filter( array_map( 'trim', $items ), 'strlen' ) );
}

/**
 * Append a value to a list option, without duplicates.
 */
function codg_list_add( $key, $value ) {
	$value = trim( (string) $value );
	if ( '' === $value ) {
		return;
	}
	$items = codg_list( $key );
	if ( ! in_array( $value, $items, true ) ) {
		$items[] = $value;
		update_option( 'codg_' . $key, implode( "\n", $items ) );
	}
}

/**
 * Add an order's phone, email and IP to the blacklist.
 */
function codg_blacklist_order( WC_Order $order ) {
	codg_list_add( 'blacklist_phones', codg_order_phone( $order ) );
	codg_list_add( 'blacklist_emails', strtolower( $order->get_billing_email() ) );
	codg_list_add( 'blacklist_ips', $order->get_customer_ip_address() );
	$order->add_order_note( __( 'Customer blacklisted by OrderProof.', 'orderproof' ) );
}

/**
 * Store's base country (e.g. "MA", "US").
 */
function codg_store_country() {
	return WC()->countries ? WC()->countries->get_base_country() : '';
}

/**
 * International calling code for a country, digits only (e.g. "MA" -> "212", "US" -> "1").
 */
function codg_calling_code( $country ) {
	if ( '' === (string) $country || ! WC()->countries ) {
		return '';
	}
	$code = WC()->countries->get_country_calling_code( $country );
	if ( is_array( $code ) ) {
		$code = reset( $code );
	}
	return preg_replace( '/\D+/', '', (string) $code );
}

/**
 * Normalize a phone number to international digits (E.164 without "+").
 * The customer's billing country decides the calling code: "0612345678" in MA -> "212612345678",
 * "(415) 555-0123" in US -> "14155550123". Numbers typed with "+" or "00" are kept as international.
 *
 * @param string $phone   Raw phone number.
 * @param string $country Billing country; defaults to the store's country.
 */
function codg_normalize_phone( $phone, $country = '' ) {
	$raw    = trim( (string) $phone );
	$digits = preg_replace( '/\D+/', '', $raw );
	if ( '' === $digits ) {
		return '';
	}
	if ( 0 === strpos( $raw, '+' ) ) {
		return $digits;
	}
	if ( 0 === strpos( $digits, '00' ) ) {
		return substr( $digits, 2 );
	}

	$cc = codg_calling_code( $country ? $country : codg_store_country() );
	if ( '' === $cc ) {
		return $digits;
	}
	// Already international without "+": starts with the calling code and is long enough.
	if ( 0 === strpos( $digits, $cc ) && strlen( $digits ) >= strlen( $cc ) + 8 ) {
		return $digits;
	}
	return $cc . ltrim( $digits, '0' );
}

/**
 * National part of a normalized phone number (calling code removed).
 */
function codg_national_number( $intl, $country = '' ) {
	$cc = codg_calling_code( $country ? $country : codg_store_country() );
	if ( '' !== $cc && 0 === strpos( $intl, $cc ) ) {
		return substr( $intl, strlen( $cc ) );
	}
	return $intl;
}

/**
 * Normalized phone of an order (stored at checkout, computed for older orders).
 */
function codg_order_phone( WC_Order $order ) {
	$phone = $order->get_meta( '_codg_phone' );
	return $phone ? $phone : codg_normalize_phone( $order->get_billing_phone(), $order->get_billing_country() );
}

/**
 * Mask a phone for display to customers: 212612345678 -> +212••••••678.
 */
function codg_mask_phone( $intl ) {
	$len = strlen( $intl );
	if ( $len < 7 ) {
		return '+' . $intl;
	}
	return '+' . substr( $intl, 0, 3 ) . str_repeat( '•', $len - 6 ) . substr( $intl, -3 );
}

/**
 * wc_get_orders() arguments that match orders by normalized phone.
 * HPOS understands meta_query; the legacy (posts) store ignores it, so there a custom
 * query var is translated into a meta query by codg_cpt_phone_query().
 */
function codg_phone_query_args( $phone ) {
	if ( class_exists( \Automattic\WooCommerce\Utilities\OrderUtil::class ) && \Automattic\WooCommerce\Utilities\OrderUtil::custom_orders_table_usage_is_enabled() ) {
		return array(
			'meta_query' => array( // phpcs:ignore WordPress.DB.SlowDBQuery
				array(
					'key'   => '_codg_phone',
					'value' => $phone,
				),
			),
		);
	}
	return array( 'codg_phone' => $phone );
}

add_filter( 'woocommerce_order_data_store_cpt_get_orders_query', 'codg_cpt_phone_query', 10, 2 );

function codg_cpt_phone_query( $query, $query_vars ) {
	if ( ! empty( $query_vars['codg_phone'] ) ) {
		$query['meta_query'][] = array(
			'key'   => '_codg_phone',
			'value' => $query_vars['codg_phone'],
		);
	}
	return $query;
}

/**
 * Statuses that count as a failed / refused delivery.
 */
function codg_failed_statuses() {
	return apply_filters( 'codg_failed_statuses', array( 'cancelled', 'failed', 'codg-refused' ) );
}

/**
 * Order history for a phone number.
 *
 * @return array{total:int,delivered:int,failed:int,pending:int}
 */
function codg_customer_history( $phone, $exclude_id = 0 ) {
	$stats = array(
		'total'     => 0,
		'delivered' => 0,
		'failed'    => 0,
		'pending'   => 0,
	);
	if ( '' === (string) $phone ) {
		return $stats;
	}

	// The orders list asks once per row; repeat customers share one lookup per request.
	// Cleared whenever an order is created or changes status (codg_flush_history_cache).
	global $codg_history_cache;
	$cache_key = $phone . '|' . (int) $exclude_id;
	if ( isset( $codg_history_cache[ $cache_key ] ) ) {
		return $codg_history_cache[ $cache_key ];
	}

	$orders = wc_get_orders(
		array(
			'limit'  => 200,
			'status' => array_keys( wc_get_order_statuses() ),
		) + codg_phone_query_args( $phone )
	);

	foreach ( $orders as $order ) {
		if ( (int) $order->get_id() === (int) $exclude_id ) {
			continue;
		}
		// Orders never verified on WhatsApp say nothing about the customer.
		if ( $order->has_status( 'codg-otp' ) ) {
			continue;
		}
		$stats['total']++;
		$status = $order->get_status();
		if ( 'completed' === $status ) {
			$stats['delivered']++;
		} elseif ( in_array( $status, codg_failed_statuses(), true ) ) {
			$stats['failed']++;
		} else {
			$stats['pending']++;
		}
	}

	$codg_history_cache[ $cache_key ] = $stats;
	return $stats;
}

function codg_flush_history_cache() {
	$GLOBALS['codg_history_cache'] = array();
}
add_action( 'woocommerce_order_status_changed', 'codg_flush_history_cache' );
add_action( 'woocommerce_new_order', 'codg_flush_history_cache' );
add_action( 'woocommerce_update_order', 'codg_flush_history_cache' );

/**
 * Default WhatsApp confirmation message.
 */
function codg_default_template() {
	return __( "Hello {name} 👋\nThank you for your order #{order_id} at {shop}.\n\nProducts: {items}\nTotal: {total}\nDelivery address: {address}\n\nPlease reply YES to confirm your order.", 'orderproof' );
}

/**
 * Replace {placeholders} in a message template with order data.
 */
function codg_render_template( $template, WC_Order $order ) {
	$items = array();
	foreach ( $order->get_items() as $item ) {
		$items[] = $item->get_name() . ' x' . $item->get_quantity();
	}

	$total = html_entity_decode(
		wp_strip_all_tags( wc_price( $order->get_total(), array( 'currency' => $order->get_currency() ) ) ),
		ENT_QUOTES,
		'UTF-8'
	);

	$address = implode( ', ', array_filter( array( $order->get_billing_address_1(), $order->get_billing_city() ) ) );

	$replacements = apply_filters(
		'codg_template_placeholders',
		array(
			'{name}'     => $order->get_billing_first_name(),
			'{order_id}' => $order->get_order_number(),
			'{total}'    => $total,
			'{items}'    => implode( ', ', $items ),
			'{address}'  => $address,
			'{phone}'    => $order->get_billing_phone(),
			'{shop}'     => get_bloginfo( 'name' ),
		),
		$order
	);

	return strtr( $template, $replacements );
}

/**
 * wa.me click-to-chat link for an order.
 */
function codg_whatsapp_url( WC_Order $order, $template = null ) {
	if ( null === $template ) {
		$template = codg_opt( 'wa_template', codg_default_template() );
	}
	$phone   = codg_order_phone( $order );
	$message = codg_render_template( $template, $order );
	return 'https://wa.me/' . rawurlencode( $phone ) . '?text=' . rawurlencode( $message );
}