"""Tests for the SemVer comparison module."""

from __future__ import annotations

import pytest

from app.plugins.semver import (
    SemVer,
    compare_versions,
    is_breaking_change,
    is_compatible,
)


class TestSemVerParse:
    def test_parse_simple(self):
        v = SemVer.parse("1.2.3")
        assert v.major == 1
        assert v.minor == 2
        assert v.patch == 3
        assert v.prerelease == ""

    def test_parse_with_prerelease(self):
        v = SemVer.parse("1.0.0-alpha.1")
        assert v.major == 1
        assert v.minor == 0
        assert v.patch == 0
        assert v.prerelease == "alpha.1"

    def test_parse_with_v_prefix(self):
        v = SemVer.parse("v2.0.0")
        assert v.major == 2

    def test_parse_invalid(self):
        with pytest.raises(ValueError):
            SemVer.parse("not-a-version")

    def test_parse_empty(self):
        with pytest.raises(ValueError):
            SemVer.parse("")

    def test_parse_two_parts(self):
        with pytest.raises(ValueError):
            SemVer.parse("1.2")

    def test_parse_four_parts(self):
        with pytest.raises(ValueError):
            SemVer.parse("1.2.3.4")


class TestSemVerComparison:
    def test_equal(self):
        assert SemVer.parse("1.0.0") == SemVer.parse("1.0.0")

    def test_less_than(self):
        assert SemVer.parse("1.0.0") < SemVer.parse("1.0.1")
        assert SemVer.parse("1.0.0") < SemVer.parse("1.1.0")
        assert SemVer.parse("1.0.0") < SemVer.parse("2.0.0")

    def test_greater_than(self):
        assert SemVer.parse("1.0.1") > SemVer.parse("1.0.0")
        assert SemVer.parse("2.0.0") > SemVer.parse("1.9.9")

    def test_prerelease_lower_than_release(self):
        assert SemVer.parse("1.0.0-alpha") < SemVer.parse("1.0.0")
        assert SemVer.parse("1.0.0-beta.1") < SemVer.parse("1.0.0")

    def test_prerelease_ordering(self):
        assert SemVer.parse("1.0.0-alpha.1") < SemVer.parse("1.0.0-alpha.2")
        assert SemVer.parse("1.0.0-alpha") < SemVer.parse("1.0.0-beta")

    def test_str(self):
        assert str(SemVer.parse("1.2.3")) == "1.2.3"
        assert str(SemVer.parse("1.0.0-beta.1")) == "1.0.0-beta.1"


class TestSemVerCompatibility:
    def test_breaking_change(self):
        assert is_breaking_change("1.0.0", "2.0.0")
        assert not is_breaking_change("1.0.0", "1.5.0")

    def test_compatible_same_major(self):
        assert is_compatible("1.5.0", "1.0.0")
        assert not is_compatible("1.0.0", "1.5.0")

    def test_compatible_higher_major(self):
        assert is_compatible("2.0.0", "1.0.0")
        assert not is_compatible("1.0.0", "2.0.0")

    def test_is_upgrade_from(self):
        assert SemVer.parse("1.1.0").is_upgrade_from(SemVer.parse("1.0.0"))
        assert not SemVer.parse("1.0.0").is_upgrade_from(SemVer.parse("1.1.0"))

    def test_is_downgrade_from(self):
        assert SemVer.parse("1.0.0").is_downgrade_from(SemVer.parse("1.1.0"))
        assert not SemVer.parse("1.1.0").is_downgrade_from(SemVer.parse("1.0.0"))


class TestCompareVersions:
    def test_compare_equal(self):
        assert compare_versions("1.0.0", "1.0.0") == 0

    def test_compare_less(self):
        assert compare_versions("1.0.0", "1.0.1") == -1

    def test_compare_greater(self):
        assert compare_versions("1.1.0", "1.0.0") == 1