// Typed allocation helpers over the Allocator protocol (std/mem.sx):
// create/destroy (one T), alloc/free (slices), clone, resize, and the
// bytes-level mem_realloc. Declared `ufcs` — the dot spelling
// (`context.allocator.create(Session)`), the pipe spelling, and the
// direct call all hit the same generic machinery. Contents are
// UNINITIALISED by design
// (Zig-aligned): assign before reading. TrackingAllocator balances to
// zero across every pair.

#import "modules/std.sx";
#import "modules/std/mem.sx";

Session :: struct { id: i64; score: i64; }

main :: () {
    gpa := GPA.init();
    tracker := TrackingAllocator.init(xx gpa);
    a : Allocator = xx tracker;

    // create / destroy — direct spelling
    s := create(a, Session);
    s.id = 7; s.score = 42;
    print("create: {} {}\n", s.id, s.score);
    destroy(a, s);

    // create — fluent pipe spelling
    p := a |> create(Session);
    p.id = 1;
    print("pipe-create: {}\n", p.id);
    a |> destroy(p);

    // create — canonical dot spelling on context.allocator
    q := context.allocator.create(Session);
    q.id = 2;
    print("dot-create: {}\n", q.id);
    context.allocator.destroy(q);

    // alloc / free — typed slice
    xs := a |> alloc(i64, 4);
    xs[0] = 10; xs[1] = 20; xs[2] = 30; xs[3] = 40;
    print("alloc: {} {} len={}\n", xs[0], xs[3], xs.len);

    // clone — independent copy (canonical dot spelling)
    ys := xs.clone(a);
    xs[0] = 99;
    print("clone: {} (orig {})\n", ys[0], xs[0]);
    a.free(ys);

    // resize — grow (copies, old backing freed)
    zs := xs |> resize(a, 6);
    zs[5] = 60;
    print("resize: {} {} len={}\n", zs[1], zs[5], zs.len);
    // resize — shrink
    ws := zs |> resize(a, 2);
    print("shrink: {} {} len={}\n", ws[0], ws[1], ws.len);
    a |> free(ws);

    // mem_realloc — bytes level
    raw := a.alloc_bytes(8);
    q : *i64 = xx raw;
    q.* = 1234;
    raw2 := mem_realloc(a, raw, 8, 16, 8);
    q2 : *i64 = xx raw2;
    print("realloc: {}\n", q2.*);
    a.dealloc_bytes(raw2);

    tracker.report();
}