// Vectors mirror Hare's @test fns in ref/hare/path/stack.ha:77-119
// and buffer.ha. The absolute rows (Hare's `local("/")`-seeded) DEFER
// to c3 (abs/local unimplemented); only the relative rows run here.
//
// Parallel `[N]str` row arrays (rather than `[N]struct{...}`) sidestep
// the cstage cgen chained `arr[i].field` store gap (getopt_test.ww:6).
// push is stateful, so each row is applied in sequence to one buffer;
// the table holds {segment, expected-string} pairs (stack.ha:36-42 is
// the normalization spec these rows encode).

package path_test;

import path;


// ref/hare/path/stack.ha:77-119 (relative rows only; absolute local()
// rows defer to c3). The dot/dotdot handling exercised here IS the
// appendnorm normalization spec (stack.ha:36-42), so no separate
// appendnorm @test is needed.

@test fn push_cases() void = {
	let buf: path.buffer;
	assert(!(path.string(&buf) != "."));

	// current-dir + parent-dir invariants (stack.ha:82-88). Single
	// segment per row → table-driven sequential apply.
	let segs: [5]str;
	let wants: [5]str;
	segs[0]="";   wants[0]=".";
	segs[1]=".";  wants[1]=".";
	segs[2]=".."; wants[2]="..";
	segs[3]="";   wants[3]="..";
	segs[4]=".";  wants[4]="..";
	let i: i32 = 0;
	for (i < 5) {
		assert(!(path.push(&buf, segs[i])! != wants[i]));
		i += 1;
	};

	// set(&buf) resets to "." (stack.ha:91). set forwards an EMPTY
	// variadic into push (KEN-oracle flag 1: zero-arg gather+forward).
	assert(!(path.set(&buf)! != "."));

	// regular path + parent (stack.ha:101-104, minus the local() row).
	let segs2: [3]str;
	let wants2: [3]str;
	segs2[0]="foo"; wants2[0]="foo";
	segs2[1]=".";   wants2[1]="foo";
	segs2[2]="..";  wants2[2]=".";
	let k: i32 = 0;
	for (k < 3) {
		assert(!(path.push(&buf, segs2[k])! != wants2[k]));
		k += 1;
	};

	// multi-segment (stack.ha:107-111). Variadic arity varies (1 or 2)
	// → inline.
	assert(!(path.push(&buf, "a", "b")!  != "a/b"));
	assert(!(path.push(&buf, "..", "c")! != "a/c"));
	assert(!(path.push(&buf, "..")!      != "a"));
	// stack.ha:110; local()→literal, SEP='/' on Linux, proper local() rides c3
	assert(!(path.push(&buf, "/d")!      != "a/d"));
	assert(!(path.push(&buf, "..", "..")! != "."));   // stack.ha:111

	// leading-SEP segment into an EMPTY buffer exercises push's
	// `j==0 && buf.end==0` root-seed arm (stack.ha:18-20), unreached
	// by the relative rows above. Hare covers it via local("/")-seeded
	// rows that defer to c3; literal "/foo" stands in (SEP='/' on Linux).
	assert(!(path.set(&buf)! != "."));
	assert(!(path.push(&buf, "/foo")! != "/foo"));
};

// ref/hare/path/stack.ha:172-180. Parent dir; root → root; empty → "..".
// Each row reseeds a reset buffer (parent goes through appendnorm). push's
// normalized echo is dropped so the empty-buffer row ("" pushes to ".",
// not "") can share the table.

@test fn parent_cases() void = {
	let buf: path.buffer;
	let ins:  [5]str;
	let want: [5]str;
	ins[0]="/usr/lib"; want[0]="/usr";
	ins[1]="foo";      want[1]=".";
	ins[2]="/";        want[2]="/";
	ins[3]="a/b/c";    want[3]="a/b";
	ins[4]="";         want[4]="..";   // empty buffer: appendnorm(dotdot) → ".."
	let i: i32 = 0;
	for (i < 5) {
		buf.end = 0;
		path.push(&buf, ins[i])!;
		assert(!(path.parent(&buf)! != want[i]));
		i += 1;
	};
};

// ref/hare/path/stack.ha:147-170 (@test pop). split is the helper, covered
// through pop/peek. Sequential off ONE buffer, reset buf.end=0 per case.
// The peek-then-string-unchanged assert is load-bearing: it pins that the
// #48 respelling didn't smuggle in pop's buf.end mutation.

@test fn popsplit_cases() void = {
	let buf: path.buffer;

	// empty
	assert(!(!(path.pop(&buf) is void)));
	assert(!(path.string(&buf) != "."));

	// root dir
	buf.end = 0;
	assert(!(path.push(&buf, "/")! != "/"));
	assert(!(!(path.pop(&buf) is void)));
	assert(!(path.string(&buf) != "/"));

	// relative file — peek is NON-mutating
	buf.end = 0;
	assert(!(path.push(&buf, "foo")! != "foo"));
	assert(!(path.peek(&buf) as str != "foo"));
	assert(!(path.string(&buf) != "foo"));
	assert(!(path.pop(&buf) as str != "foo"));
	assert(!(path.string(&buf) != "."));

	// absolute file
	buf.end = 0;
	assert(!(path.push(&buf, "/foo")! != "/foo"));
	assert(!(path.peek(&buf) as str != "foo"));
	assert(!(path.pop(&buf) as str != "foo"));
	assert(!(path.string(&buf) != "/"));
};