// timetest — exercises lib/time. Run with `out/bin/ww run
// lib/time/timetest.ww`. A failing row aborts via the assert/abort
// builtin (task #5 @test conversion).

package time_test;

import time;



// ---- constants: load-bearing names + values ----------------------------
//
// Without these multipliers every caller would re-derive 1e9 in
// place. The values themselves are nailed down by Hare's
// ref/hare/time/duration.ha:9-18.

@test fn constants() void = {
	assert(!((time.nanosecond:  i64) !=          1i64));
	assert(!((time.microsecond: i64) !=       1000i64));
	assert(!((time.millisecond: i64) !=    1000000i64));
	assert(!((time.second:      i64) != 1000000000i64));

	// "Roundtrip" check: derived multiples land on the canonical
	// nanosecond count. Catches a future re-derivation drift.
	assert(!(5i64 * (time.second: i64)      != 5000000000i64));
	assert(!(3i64 * (time.millisecond: i64) !=    3000000i64));
	assert(!(7i64 * (time.microsecond: i64) !=       7000i64));
};

// ---- now(monotonic) is monotonic across two calls ----------------------

@test fn nowmonotonic() void = {
	let a = time.now(time.clock.monotonic);
	let b = time.now(time.clock.monotonic);
	// Two back-to-back calls — b can equal a (same ns tick) but
	// must never precede it.
	assert(!(time.compare(a, b) > 0i8));
};

// ---- now(realtime) returns a post-2020 epoch ---------------------------
//
// Sanity check that the syscall plumbing actually lands real bytes
// in the instant. 2020-01-01 UTC = 1577836800 unix seconds; any
// past-2020 wall clock satisfies this. (CI / test machines running
// pre-2020 would fail here; acceptable trade for catching a
// zero-init / wrong-slot regression.)

@test fn nowrealtime() void = {
	let t = time.now(time.clock.realtime);
	assert(!(t.sec < 1577836800i64));
	assert(!(t.nsec < 0i64));
	assert(!(t.nsec >= 1000000000i64));
};

// ---- add: zero duration is identity ------------------------------------

@test fn addzero() void = {
	let a: time.instant;
	a.sec = 100i64; a.nsec = 500i64;
	let r = time.add(a, 0i64);
	assert(!(r.sec != 100i64));
	assert(!(r.nsec != 500i64));
};

// ---- add: positive duration, no carry ----------------------------------

@test fn addpos_nocarry() void = {
	let a: time.instant;
	a.sec = 10i64; a.nsec = 100i64;
	let r = time.add(a, 200i64);
	assert(!(r.sec != 10i64));
	assert(!(r.nsec != 300i64));
};

// ---- add: positive duration, carries into next second ------------------

@test fn addpos_carry() void = {
	let a: time.instant;
	a.sec = 10i64; a.nsec = 999999900i64;
	let r = time.add(a, 200i64);
	assert(!(r.sec != 11i64));
	assert(!(r.nsec != 100i64));
};

// ---- add: full-second duration -----------------------------------------

@test fn addpos_fullsecond() void = {
	let a: time.instant;
	a.sec = 5i64; a.nsec = 0i64;
	let r = time.add(a, (time.second: i64) * 3i64);
	assert(!(r.sec != 8i64));
	assert(!(r.nsec != 0i64));
};

// ---- add: negative duration, no borrow ---------------------------------

@test fn addneg_noborrow() void = {
	let a: time.instant;
	a.sec = 10i64; a.nsec = 500i64;
	let r = time.add(a, -100i64);
	assert(!(r.sec != 10i64));
	assert(!(r.nsec != 400i64));
};

// ---- add: negative duration, borrows from previous second --------------

@test fn addneg_borrow() void = {
	let a: time.instant;
	a.sec = 10i64; a.nsec = 100i64;
	let r = time.add(a, -200i64);
	assert(!(r.sec != 9i64));
	assert(!(r.nsec != 999999900i64));
};

// ---- diff: simple subtraction ------------------------------------------

@test fn diffsimple() void = {
	let a: time.instant; a.sec = 10i64; a.nsec = 100i64;
	let b: time.instant; b.sec = 12i64; b.nsec = 300i64;
	let d: i64 = time.diff(a, b): i64;
	// b - a = 2.0000002 sec = 2_000_000_200 ns
	assert(!(d != 2000000200i64));
};

// ---- diff: reversed sign -----------------------------------------------

@test fn diffneg() void = {
	let a: time.instant; a.sec = 12i64; a.nsec = 300i64;
	let b: time.instant; b.sec = 10i64; b.nsec = 100i64;
	let d: i64 = time.diff(a, b): i64;
	assert(!(d != -2000000200i64));
};

// ---- compare: -1 / 0 / +1 ladder ---------------------------------------

@test fn comparelt() void = {
	let a: time.instant; a.sec = 1i64; a.nsec = 0i64;
	let b: time.instant; b.sec = 2i64; b.nsec = 0i64;
	assert(!(time.compare(a, b) != -1i8));
};

@test fn comparegt() void = {
	let a: time.instant; a.sec = 2i64; a.nsec = 0i64;
	let b: time.instant; b.sec = 1i64; b.nsec = 0i64;
	assert(!(time.compare(a, b) != 1i8));
};

@test fn compareeq() void = {
	let a: time.instant; a.sec = 5i64; a.nsec = 42i64;
	let b: time.instant; b.sec = 5i64; b.nsec = 42i64;
	assert(!(time.compare(a, b) != 0i8));
};

@test fn comparensec_only() void = {
	let a: time.instant; a.sec = 5i64; a.nsec = 100i64;
	let b: time.instant; b.sec = 5i64; b.nsec = 200i64;
	assert(!(time.compare(a, b) != -1i8));
	assert(!(time.compare(b, a) !=  1i8));
};