import time

fn test_parse() {
	s := '2018-01-27 12:48:34'
	t := time.parse(s) or {
		assert false
		return
	}
	assert t.year == 2018 && t.month == 1 && t.day == 27 && t.hour == 12 && t.minute == 48
		&& t.second == 34
	assert t.unix == 1517057314
}

fn test_parse_invalid() {
	s := 'Invalid time string'
	time.parse(s) or {
		assert true
		return
	}
	assert false
}

fn test_parse_rfc2822() {
	s1 := 'Thu, 12 Dec 2019 06:07:45 GMT'
	t1 := time.parse_rfc2822(s1) or {
		assert false
		return
	}
	assert t1.year == 2019 && t1.month == 12 && t1.day == 12 && t1.hour == 6 && t1.minute == 7
		&& t1.second == 45
	assert t1.unix == 1576130865
	s2 := 'Thu 12 Dec 2019 06:07:45 +0800'
	t2 := time.parse_rfc2822(s2) or {
		assert false
		return
	}
	assert t2.year == 2019 && t2.month == 12 && t2.day == 12 && t2.hour == 6 && t2.minute == 7
		&& t2.second == 45
	assert t2.unix == 1576130865
}

fn test_parse_rfc2822_invalid() {
	s3 := 'Thu 12 Foo 2019 06:07:45 +0800'
	time.parse_rfc2822(s3) or {
		assert true
		return
	}
	assert false
}

fn test_parse_iso8601() {
	formats := [
		'2020-06-05T15:38:06Z',
		'2020-06-05T15:38:06.015959Z',
		'2020-06-05T15:38:06.015959+00:00',
		'2020-06-05T15:38:06.015959+02:00',
		'2020-06-05T15:38:06.015959-02:00',
		'2020-11-05T15:38:06.015959Z',
	]
	times := [
		[2020, 6, 5, 15, 38, 6, 0],
		[2020, 6, 5, 15, 38, 6, 15959],
		[2020, 6, 5, 15, 38, 6, 15959],
		[2020, 6, 5, 13, 38, 6, 15959],
		[2020, 6, 5, 17, 38, 6, 15959],
		[2020, 11, 5, 15, 38, 6, 15959],
	]
	for i, format in formats {
		t := time.parse_iso8601(format) or {
			assert false
			continue
		}
		year := times[i][0]
		assert t.year == year
		month := times[i][1]
		assert t.month == month
		day := times[i][2]
		assert t.day == day
		hour := times[i][3]
		assert t.hour == hour
		minute := times[i][4]
		assert t.minute == minute
		second := times[i][5]
		assert t.second == second
		microsecond := times[i][6]
		assert t.microsecond == microsecond
	}
}

fn test_parse_iso8601_local() {
	format := '2020-06-05T15:38:06.015959'
	t := time.parse_iso8601(format) or {
		assert false
		return
	}
	assert t.year == 2020
	assert t.month == 6
	assert t.day == 5
	assert t.hour == 15
	assert t.minute == 38
	assert t.second == 6
	assert t.microsecond == 15959
}

fn test_parse_iso8601_invalid() {
	formats := [
		'',
		'2020-06-05X15:38:06.015959Z',
		'2020-06-05T15:38:06.015959X',
		'2020-06-05T15:38:06.015959+0000',
		'2020-06-05T',
		'2020-06-05Z',
		'2020-06-05+00:00',
		'15:38:06',
	]
	for format in formats {
		time.parse_iso8601(format) or {
			assert true
			continue
		}
		assert false
	}
}

fn test_parse_iso8601_date_only() {
	format := '2020-06-05'
	t := time.parse_iso8601(format) or {
		assert false
		return
	}
	assert t.year == 2020
	assert t.month == 6
	assert t.day == 5
	assert t.hour == 0
	assert t.minute == 0
	assert t.second == 0
	assert t.microsecond == 0
}

fn check_invalid_date(s string) {
	if date := time.parse(s) {
		eprintln('invalid date: "$s" => "$date"')
		assert false
	}
	assert true
}

fn test_invalid_dates_should_error_during_parse() {
	check_invalid_date('-99999-12-20 00:00:00')
	check_invalid_date('99999-12-20 00:00:00')
	//
	check_invalid_date('2008-00-20 00:00:00')
	check_invalid_date('2008-25-20 00:00:00')
	//
	check_invalid_date('2008-12-00 00:00:00')
	check_invalid_date('2008-12-32 00:00:00')
	//
	check_invalid_date('2008-12-01 30:00:00')
	check_invalid_date('2008-12-01 00:60:00')
	check_invalid_date('2008-12-01 00:01:60')
}