use fmt;
use io;
use locale;
use os;

@test fn next() void = {
	let h_de = "Desktop Entry";
	let h_dag = "Desktop Action Gallery";
	let h_dac = "Desktop Action Create";
	let correct: []line = [
		"This is a comment": comment,
		h_de: group_header,
		entry_new(h_de, "Version", "1.0", locale::c),
		entry_new(h_de, "Type", "Application", locale::c),
		entry_new(h_de, "Name", "Foo Viewer", locale::c),
		entry_new(h_de, "Comment", "The best viewer for Foo objects available!", locale::c),
		entry_new(h_de, "TryExec", "fooview", locale::c),
		entry_new(h_de, "Exec", "fooview %F", locale::c),
		blank,
		entry_new(h_de, "Icon", "fooview", locale::c),
		entry_new(h_de, "MimeType", "image/x-foo;", locale::c),
		entry_new(h_de, "Actions", "Gallery;Create;", locale::c),
		blank,
		h_dag: group_header,
		entry_new(h_dag, "Exec", "fooview --gallery", locale::c),
		entry_new(h_dag, "Name", "Browse Gallery", locale::c),
		blank,
		h_dac: group_header,
		entry_new(h_dac, "Exec", "fooview --create-new", locale::c),
		entry_new(h_dac, "Name", "Create a new Foo!", locale::c),
		entry_new(
			h_dac, "Name", "Create a new Foo!",
			locale::parse("en_US")!),
		entry_new(
			h_dac, "Name", "Zweep zoop flooble glorp",
			locale::parse("xx_XX.UTF-8")!),
		"Another comment": comment,
		entry_new(h_dac, "Icon", "fooview-new", locale::c),
	];

	let file = os::open("format/desktop_entry/test_data/foo.desktop")!;
	defer io::close(file)!;
	let scanne = scan(file);
	defer finish(&scanne);

	for (let correct .. correct) match(next(&scanne)!) {
	case io::EOF =>
		abort("encountered EOF early");
	case blank =>
		assert(correct is blank);
	case let ln: comment =>
		assert(ln == correct as comment);
	case let ln: group_header =>
		assert(ln == correct as group_header);
	case let ln: entry =>
		assert(entry_equal(ln, correct as entry));
	};

	assert(next(&scanne) is io::EOF);
};

@test fn next_entry() void = {
	let h_de = "Desktop Entry";
	let h_dag = "Desktop Action Gallery";
	let h_dac = "Desktop Action Create";
	let correct: []entry = [
		entry_new(h_de, "Version", "1.0", locale::c),
		entry_new(h_de, "Type", "Application", locale::c),
		entry_new(h_de, "Name", "Foo Viewer", locale::c),
		entry_new(h_de, "Comment", "The best viewer for Foo objects available!", locale::c),
		entry_new(h_de, "TryExec", "fooview", locale::c),
		entry_new(h_de, "Exec", "fooview %F", locale::c),
		entry_new(h_de, "Icon", "fooview", locale::c),
		entry_new(h_de, "MimeType", "image/x-foo;", locale::c),
		entry_new(h_de, "Actions", "Gallery;Create;", locale::c),
		entry_new(h_dag, "Exec", "fooview --gallery", locale::c),
		entry_new(h_dag, "Name", "Browse Gallery", locale::c),
		entry_new(h_dac, "Exec", "fooview --create-new", locale::c),
		entry_new(h_dac, "Name", "Create a new Foo!", locale::c),
		entry_new(
			h_dac, "Name", "Create a new Foo!",
			locale::parse("en_US")!),
		entry_new(
			h_dac, "Name", "Zweep zoop flooble glorp",
			locale::parse("xx_XX.UTF-8")!),
		entry_new(h_dac, "Icon", "fooview-new", locale::c),
	];

	let file = os::open("format/desktop_entry/test_data/foo.desktop")!;
	defer io::close(file)!;
	let scanne = scan(file);
	defer finish(&scanne);

	for (let correct .. correct) {
		assert(entry_equal(next_entry(&scanne)! as entry, correct));
	};

	assert(next(&scanne) is io::EOF);
};

@test fn parse_entry() void = {
	assert(entry_equal(parse_entry("hello=world")!, entry {
		key    = "hello",
		value  = "world",
		locale = locale::c,
		...
	}));
	assert(entry_equal(parse_entry("hello[sr_YU.UTF-8@Latn]=world")!, entry {
		key    = "hello",
		value  = "world",
		locale = locale::parse("sr_YU.UTF-8@Latn")!,
		...
	}));
};

@test fn validate_entry_key() void = {
	// §3.3 Only the characters A-Za-z0-9- may be used in key names.
	assert(validate_entry_key("SomeName") is void);
	assert(validate_entry_key("some-name") is void);
	assert(validate_entry_key("1234567890some-0987654321naMe") is void);
	assert(validate_entry_key("^&(*)[") is invalid_entry);
	assert(validate_entry_key("]") is invalid_entry);
	assert(validate_entry_key("&*%^") is invalid_entry);
	assert(validate_entry_key("asj=hd@#*()") is invalid_entry);
};

@test fn validate_entry_locale() void = {
	assert(validate_entry_locale("sr_YU.UTF-8@Latn") is void);
	assert(validate_entry_locale("abcd[") is invalid_entry);
	assert(validate_entry_locale("ab]cd") is invalid_entry);
	assert(validate_entry_locale("a=bcd") is invalid_entry);
};

fn entry_equal(a: entry, b: entry) bool =
	a.group == b.group &&
	a.key   == b.key   &&
	a.value == b.value &&
	locale::equal(a.locale, b.locale);

fn entry_new(group: str, key: str, value: str, local: locale::locale) entry = entry {
	group  = group,
	key    = key,
	value  = value,
	locale = local,
};