// Comptime compiler API — type-kind + enum-value reflection readers (Phase 3).
//
// Completes the READ side the metatype needs to re-express `type_info(T)` as sx:
//
//   type_kind(t)            → a stable kind discriminant, to branch on the shape
//                             (0 other · 1 struct · 2 enum · 3 tagged_union ·
//                              4 tuple · 5 union · 6 array · 7 vector · 8 error_set)
//   type_field_value(t, i)  → enum variant i's integer value (explicit or ordinal)
//
// Together with find_type / type_field_count / type_field_name / type_field_type
// / type_nominal_name (examples 0628–0629), a comptime sx function can now fully
// reflect a struct/enum/tuple into data — no `#builtin` needed. All folded at
// `#run`, 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_kind        :: (t: TypeId) -> i64 abi(.compiler);
type_field_name  :: (t: TypeId, idx: i64) -> StringId abi(.compiler);
type_field_value :: (t: TypeId, idx: i64) -> i64 abi(.compiler);

Color       :: enum { red; green; blue; }
WindowFlags :: enum flags u32 { vsync :: 64; resizable :: 4; hidden :: 128; }
Point       :: struct { x: i64; y: i64; }

color_kind :: #run type_kind(find_type(intern("Color")));   // 2 = enum
point_kind :: #run type_kind(find_type(intern("Point")));   // 1 = struct

// Plain enum → ordinal values.
green_val :: #run type_field_value(find_type(intern("Color")), 1);   // 1

// Flags enum → explicit values, read by name + value.
vsync_name :: #run text_of(type_field_name(find_type(intern("WindowFlags")), 0)); // "vsync"
vsync_val  :: #run type_field_value(find_type(intern("WindowFlags")), 0);          // 64

main :: () {
    print("Color kind = {}, Point kind = {}\n", color_kind, point_kind);
    print("Color.green = {}\n", green_val);
    print("WindowFlags.{} = {}\n", vsync_name, vsync_val);
}