<?php

namespace Blocksy;

// Mechanism for safely calling functions from the Blocksy theme.
// In some cases, these functions can be not defined just yet, so we have to
// handle that gracefully.
//
// The caller of this class should be prepared to handle `null` return values.
//
// For the blocksy_get_theme_mod() function, the special handling of the null
// value is not necessary.
//
// Right now, only five functions must be protected with this proxy:
//
// - blocksy_get_theme_mod()
// - blocksy_get_variables_from_file()
// - blocksy_manager()
// - blocksy_get_search_post_type()
// - blocksy_has_dynamic_css_in_frontend()
//
// If more functions will be called earlier than `after_setup_theme`, they
// should be added here and should be only called through this proxy object.
class ThemeFunctions {
	public static $NON_EXISTING_FUNCTION = null;

	public function __call($name, $arguments) {
		if (function_exists($name)) {
			return call_user_func_array($name, $arguments);
		}

		ob_start();
		// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_debug_print_backtrace
		debug_print_backtrace();
		$backtrace = ob_get_clean();

		blocksy_companion_debug_log('ThemeFunctions->__call : missing function', [
			'function_name' => $name,
			'is_cli' => defined('WP_CLI') && WP_CLI ? 'yes' : 'no',

			// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotValidated, WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			'current_script' => $_SERVER['SCRIPT_FILENAME'],

			'backtrace' => $backtrace,

			// phpcs:ignore WordPress.Security.NonceVerification.Recommended
			'request' => $_REQUEST
		]);

		if ($name === 'blocksy_has_dynamic_css_in_frontend') {
			return false;
		}

		if ($name === 'blocksy_get_search_post_type') {
			return [];
		}

		$functions_with_default = [
			'blocksy_get_theme_mod',
			'blocksy_get_variables_from_file',
		];

		// Special case for blocksy_get_theme_mod, when we know the default
		// is the 2nd argument. Other helpers will not be handled like this
		// and the caller are supposed to handle the `null` return value.
		if (in_array($name, $functions_with_default)) {
			if (count($arguments) > 1) {
				return $arguments[1];
			}
		}

		// Every other function should handle the special case of the `null`.
		return self::$NON_EXISTING_FUNCTION;
	}
}