#!/usr/bin/env fun

// Demonstration of enhanced typeof behavior:
//
// - typeof(<identifier>) for declared integer types returns the subtype:
//     Sint8, Sint16, Sint32, Sint64, Uint8, Uint16, Uint32, Uint64
// - typeof(<expression>) or non-integer identifiers returns runtime categories:
//     Number, String, Array, Map, Function, Nil

// Integer subtypes (declared)
sint8   si8  = -1
sint16  si16 = -32768
sint32  si32 = -2147483648
sint64  si64 = -9223372036854775808

uint8  ui8  = 255
uint16 ui16 = 65535
uint32 ui32 = 4294967295
uint64 ui64 = 18446744073709551615

// 'number' maps to Uint64 behavior by design
number n = 42

// Other runtime types
string s = "hello"
arr = [1, 2, 3]
m = { "k": 1 }

fun f()
  return 0

nil x = nil

// typeof on identifiers (for integers => declared subtype)
print("typeof(si8)  = " + typeof(si8))   // Int8
print("typeof(si16) = " + typeof(si16))  // Int16
print("typeof(si32) = " + typeof(si32))  // Int32
print("typeof(si64) = " + typeof(si64))  // Int64

print("typeof(ui8)  = " + typeof(ui8))   // Uint8
print("typeof(ui16) = " + typeof(ui16))  // Uint16
print("typeof(ui32) = " + typeof(ui32))  // Uint32
print("typeof(ui64) = " + typeof(ui64))  // Uint64

print("typeof(n)    = " + typeof(n))     // Uint64

// typeof on identifiers for non-integers -> runtime categories
print("typeof(s)    = " + typeof(s))     // String
print("typeof(arr)  = " + typeof(arr))   // Array
print("typeof(m)    = " + typeof(m))     // Map
print("typeof(f)    = " + typeof(f))     // Function
print("typeof(x)    = " + typeof(x))     // Nil

// typeof on expressions -> runtime category (Number), not the declared subtype
print("typeof(ui8 + 1) = " + typeof(ui8 + 1))  // Number
print("typeof(si16 - 2) = " + typeof(si16 - 2))// Number

// Demonstrate that subtype remains on identifier after operations (assignment clamps)
ui8 = ui8 + 10
print("ui8 value = " + to_string(ui8) + ", typeof(ui8) = " + typeof(ui8)) // Uint8

si8 = si8 - 5
print("si8 value = " + to_string(si8) + ", typeof(si8) = " + typeof(si8)) // Int8