// Comptime compiler API — field-level reflection readers (Phase 3).
//
// Builds on the `find_type` / `type_field_count` readers (example 0628) with the
// per-member readers, all on the same plain-`u32`-handle shape (scalar in,
// handle out — no marshaling):
//
//   type_field_name(t, i)  → the i-th member's name handle (StringId)
//   type_field_type(t, i)  → the i-th member's type handle (TypeId)
//   type_nominal_name(t)   → a named type's own name handle (StringId)
//
// Reflecting `Pair { lo: Point; hi: Point; }`: read each field's name, and the
// nominal name of each field's type. Chains
// intern → find_type → type_field_{name,type} → (type_nominal_name) → text_of,
// all folded at comptime, all serviced natively by the flat-memory VM.

#import "modules/std.sx";


StringId :: u32;
TypeId   :: u32;

intern            :: (s: string) -> StringId abi(.compiler);
text_of           :: (id: StringId) -> string abi(.compiler);
find_type         :: (name: StringId) -> TypeId abi(.compiler);
type_field_count  :: (t: TypeId) -> i64 abi(.compiler);
type_nominal_name :: (t: TypeId) -> StringId abi(.compiler);
type_field_name   :: (t: TypeId, idx: i64) -> StringId abi(.compiler);
type_field_type   :: (t: TypeId, idx: i64) -> TypeId abi(.compiler);

Point :: struct { x: i64; y: i64; }
Pair  :: struct { lo: Point; hi: Point; }

pair    :: #run find_type(intern("Pair"));
n       :: #run type_field_count(find_type(intern("Pair")));
f0_name :: #run text_of(type_field_name(find_type(intern("Pair")), 0));
f1_name :: #run text_of(type_field_name(find_type(intern("Pair")), 1));
// field 0's type is `Point` — read its nominal name through the type handle.
f0_type :: #run text_of(type_nominal_name(type_field_type(find_type(intern("Pair")), 0)));

main :: () {
    print("Pair has {} fields\n", n);
    print("field 0 = {} : {}\n", f0_name, f0_type);
    print("field 1 = {} : {}\n", f1_name, f0_type);
}