package logstorage

import (
	"testing"
	"time"
)

func TestSyslogParser(t *testing.T) {
	f := func(s string, timezone *time.Location, resultExpected string) {
		t.Helper()

		const currentYear = 2024
		p := GetSyslogParser(currentYear, timezone)
		defer PutSyslogParser(p)

		p.Parse(s)
		result := MarshalFieldsToLogfmt(nil, p.Fields)
		if string(result) != resultExpected {
			t.Fatalf("unexpected result when parsing [%s]; got\n%s\nwant\n%s\n", s, result, resultExpected)
		}
	}

	// RFC 3164
	f("Jun  3 12:08:33 abcd systemd[1]: Starting Update the local ESM caches...", time.UTC,
		`format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=abcd app_name=systemd proc_id=1 message="Starting Update the local ESM caches..."`)
	f("<165>Jun  3 12:08:33 abcd systemd[1]: Starting Update the local ESM caches...", time.UTC,
		`priority=165 facility=20 severity=5 format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=abcd app_name=systemd proc_id=1 message="Starting Update the local ESM caches..."`)
	f("Mar 13 12:08:33 abcd systemd: Starting Update the local ESM caches...", time.UTC,
		`format=rfc3164 timestamp=2024-03-13T12:08:33.000Z hostname=abcd app_name=systemd message="Starting Update the local ESM caches..."`)
	f("Jun  3 12:08:33 abcd - Starting Update the local ESM caches...", time.UTC,
		`format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=abcd app_name=- message="Starting Update the local ESM caches..."`)
	f("Jun  3 12:08:33 - - Starting Update the local ESM caches...", time.UTC,
		`format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=- app_name=- message="Starting Update the local ESM caches..."`)

	// RFC 5424
	f(`<165>1 2023-06-03T17:42:32.123456789Z mymachine.example.com appname 12345 ID47 - This is a test message with structured data.`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z hostname=mymachine.example.com app_name=appname proc_id=12345 msg_id=ID47 message="This is a test message with structured data."`)
	f(`1 2023-06-03T17:42:32.123456789Z mymachine.example.com appname 12345 ID47 - This is a test message with structured data.`, time.UTC,
		`format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z hostname=mymachine.example.com app_name=appname proc_id=12345 msg_id=ID47 message="This is a test message with structured data."`)
	f(`<165>1 2023-06-03T17:42:00.000Z mymachine.example.com appname 12345 ID47 [exampleSDID@32473 iut="3" eventSource="Application 123 = ] 56" eventID="11211"] This is a test message with structured data.`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:00.000Z hostname=mymachine.example.com app_name=appname proc_id=12345 msg_id=ID47 exampleSDID@32473.iut=3 exampleSDID@32473.eventSource="Application 123 = ] 56" exampleSDID@32473.eventID=11211 message="This is a test message with structured data."`)
	f(`<165>1 2023-06-03T17:42:00.000Z mymachine.example.com appname 12345 ID47 [foo@123 iut="3"][bar@456 eventID="11211"][abc=def][x=y z=a q="]= "] This is a test message with structured data.`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:00.000Z hostname=mymachine.example.com app_name=appname proc_id=12345 msg_id=ID47 foo@123.iut=3 bar@456.eventID=11211 abc=def x=y z=a q="]= " message="This is a test message with structured data."`)

	// Incomplete RFC 3164
	f("", time.UTC, ``)
	f("Jun  3 12:08:33", time.UTC, `format=rfc3164 timestamp=2024-06-03T12:08:33.000Z`)
	f("Foo  3 12:08:33", time.UTC, `format=rfc3164 message="Foo  3 12:08:33"`)
	f("Foo  3 12:08:33bar", time.UTC, `format=rfc3164 message="Foo  3 12:08:33bar"`)
	f("Jun  3 12:08:33 abcd", time.UTC, `format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=abcd`)
	f("Jun  3 12:08:33 abcd sudo", time.UTC, `format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=abcd app_name=sudo`)
	f("Jun  3 12:08:33 abcd sudo[123]", time.UTC, `format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=abcd app_name=sudo proc_id=123`)
	f("Jun  3 12:08:33 abcd sudo foobar", time.UTC, `format=rfc3164 timestamp=2024-06-03T12:08:33.000Z hostname=abcd app_name=sudo message=foobar`)
	f(`foo bar baz`, time.UTC, `format=rfc3164 message="foo bar baz"`)

	// Incomplete RFC 5424
	f(`<165>1 2023-06-03T17:42:32.123456789Z mymachine.example.com appname 12345 ID47 [foo@123]`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z hostname=mymachine.example.com app_name=appname proc_id=12345 msg_id=ID47 foo@123=`)
	f(`<165>1 2023-06-03T17:42:32.123456789Z mymachine.example.com appname 12345 ID47`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z hostname=mymachine.example.com app_name=appname proc_id=12345 msg_id=ID47`)
	f(`<165>1 2023-06-03T17:42:32.123456789Z mymachine.example.com appname 12345`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z hostname=mymachine.example.com app_name=appname proc_id=12345`)
	f(`<165>1 2023-06-03T17:42:32.123456789Z mymachine.example.com appname`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z hostname=mymachine.example.com app_name=appname`)
	f(`<165>1 2023-06-03T17:42:32.123456789Z mymachine.example.com`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z hostname=mymachine.example.com`)
	f(`<165>1 2023-06-03T17:42:32.123456789Z`, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424 timestamp=2023-06-03T17:42:32.123456789Z`)
	f(`<165>1 `, time.UTC,
		`priority=165 facility=20 severity=5 format=rfc5424`)
}