"""Tests for update system — TDD: tests before implementation."""

import pytest
from pathlib import Path

from i2p_apps.updater.version import Version, compare_versions
from i2p_apps.updater.su3 import SU3Header, parse_su3_header
from i2p_apps.updater.checker import UpdateChecker, UpdateInfo


class TestVersion:
    def test_parse(self):
        v = Version("0.9.62")
        assert v.major == 0
        assert v.minor == 9
        assert v.patch == 62

    def test_compare_equal(self):
        assert compare_versions("0.9.62", "0.9.62") == 0

    def test_compare_newer(self):
        assert compare_versions("0.9.63", "0.9.62") > 0

    def test_compare_older(self):
        assert compare_versions("0.9.61", "0.9.62") < 0

    def test_compare_major(self):
        assert compare_versions("1.0.0", "0.9.99") > 0

    def test_str(self):
        v = Version("2.4.0")
        assert str(v) == "2.4.0"

    def test_two_part(self):
        v = Version("0.9")
        assert v.major == 0
        assert v.minor == 9
        assert v.patch == 0


class TestSU3Header:
    def test_magic(self):
        # SU3 files start with magic "I2Psu3"
        data = b"I2Psu3" + b"\x00" * 50
        header = parse_su3_header(data)
        assert header is not None
        assert header.magic == "I2Psu3"

    def test_invalid_magic(self):
        data = b"NOTSU3" + b"\x00" * 50
        header = parse_su3_header(data)
        assert header is None

    def test_too_short(self):
        data = b"I2P"
        header = parse_su3_header(data)
        assert header is None


class TestUpdateChecker:
    def test_creation(self):
        checker = UpdateChecker(current_version="0.9.62")
        assert checker.current_version == "0.9.62"

    def test_needs_update_true(self):
        checker = UpdateChecker(current_version="0.9.62")
        info = UpdateInfo(version="0.9.63", url="http://example.i2p/update.su3")
        assert checker.needs_update(info) is True

    def test_needs_update_false(self):
        checker = UpdateChecker(current_version="0.9.63")
        info = UpdateInfo(version="0.9.62", url="http://example.i2p/update.su3")
        assert checker.needs_update(info) is False

    def test_needs_update_same(self):
        checker = UpdateChecker(current_version="0.9.62")
        info = UpdateInfo(version="0.9.62", url="http://example.i2p/update.su3")
        assert checker.needs_update(info) is False