package link.roadio.riff.config

/** Canonical object ordering is for transport/identity, never discovery precedence. */
internal fun configurationJson(value: Any): String =
    when (value) {
        is Map<*, *> -> {
            value.entries.sortedBy { it.key as String }.joinToString(",", "{", "}") {
                configurationJson(it.key as String) + ":" +
                    configurationJson(checkNotNull(it.value))
            }
        }

        is List<*> -> {
            value.joinToString(",", "[", "]") { configurationJson(checkNotNull(it)) }
        }

        is String -> {
            buildString {
                append('"')
                value.forEach { c ->
                    when (c) {
                        '"' -> append("\\\"")
                        '\\' -> append("\\\\")
                        else -> if (c.code < 32) append("\\u" + c.code.toString(16).padStart(4, '0')) else append(c)
                    }
                }
                append('"')
            }
        }

        is Boolean, is Number -> {
            value.toString()
        }

        else -> {
            error("Unsupported configuration value")
        }
    }