package config

import "testing"

func TestCompareVersions(t *testing.T) {
	tests := []struct {
		a, b string
		want int
	}{
		{"v1.0.0", "v1.0.0", 0},
		{"1.0.0", "v1.0.0", 0}, // 'v' prefix optional
		{"v1.0.0", "v1.0.1", -1},
		{"v1.0.1", "v1.0.0", 1},
		{"v1.1.0", "v1.0.99", 1},
		{"v2.0.0", "v1.99.99", 1},
		{"v0.3.0-dev", "v0.3.0", 0},   // pre-release suffix ignored
		{"v0.2.5", "v0.3.0", -1},
		{"v0.3.0", "v0.2.999", 1},
		{"v1.2", "v1.2.0", 0}, // missing component defaults to 0
		{"v1", "v1.0.0", 0},
	}
	for _, tt := range tests {
		got, err := CompareVersions(tt.a, tt.b)
		if err != nil {
			t.Errorf("CompareVersions(%q, %q): %v", tt.a, tt.b, err)
			continue
		}
		if got != tt.want {
			t.Errorf("CompareVersions(%q, %q) = %d, want %d", tt.a, tt.b, got, tt.want)
		}
	}
}

func TestCompareVersionsRejectsGarbage(t *testing.T) {
	bad := []string{
		"not-a-version",
		"v.1.2",
		"vabc",
		"",
	}
	for _, s := range bad {
		if _, err := CompareVersions(s, "v1.0.0"); err == nil {
			t.Errorf("CompareVersions(%q, ...) accepted, want error", s)
		}
	}
}