package main

import "testing"

func TestVersionsAreOrderedAsSemverSays(t *testing.T) {
	// Each is lower than the next (semver.org §11's own example, and the edges around it).
	ordered := []string{"0.0.1", "0.1.0", "1.0.0-0", "1.0.0-alpha", "1.0.0-alpha.1", "1.0.0-alpha.beta", "1.0.0-beta",
		"1.0.0-beta.2", "1.0.0-beta.11", "1.0.0-rc.1", "1.0.0", "1.0.1", "1.2.0", "1.10.0", "2.0.0"}
	for i := 0; i+1 < len(ordered); i++ {
		a, _ := ParseVersion(ordered[i])
		b, _ := ParseVersion(ordered[i+1])
		if Compare(a, b) >= 0 || Compare(b, a) <= 0 {
			t.Errorf("%s should be lower than %s", ordered[i], ordered[i+1])
		}
	}
	a, _ := ParseVersion("1.2.3+build.1")
	b, _ := ParseVersion("1.2.3")
	if Compare(a, b) != 0 {
		t.Error("build metadata does not order")
	}
	for _, bad := range []string{"1.2", "x", "1.2.3.4", "latest", ""} {
		if _, err := ParseVersion(bad); err == nil {
			t.Errorf("%q read as a version", bad)
		}
	}
}

func TestRangesAreReadAsNpmReadsThem(t *testing.T) {
	cases := []struct {
		r   string
		in  []string
		out []string
	}{
		{"1.2.3", []string{"1.2.3"}, []string{"1.2.4", "1.2.3-beta"}},
		{"=1.2.3", []string{"1.2.3"}, []string{"1.2.2"}},
		{"^1.2.3", []string{"1.2.3", "1.9.9"}, []string{"2.0.0", "1.2.2", "1.3.0-beta", "2.0.0-0"}},
		{"^0.2.3", []string{"0.2.3", "0.2.9"}, []string{"0.3.0", "0.2.2"}},
		{"^0.0.3", []string{"0.0.3"}, []string{"0.0.4"}},
		{"^1.2", []string{"1.2.0", "1.9.0"}, []string{"2.0.0", "1.1.9"}},
		{"^0.x", []string{"0.0.1", "0.9.9"}, []string{"1.0.0"}},
		{"^0.0", []string{"0.0.9"}, []string{"0.1.0"}},
		{"^1.2.3-beta.2", []string{"1.2.3-beta.2", "1.2.3-beta.4", "1.2.3", "1.5.0"}, []string{"1.2.3-beta.1", "1.2.4-beta.1", "2.0.0"}},
		{"~1.2.3", []string{"1.2.3", "1.2.9"}, []string{"1.3.0", "1.2.2"}},
		{"~1.2", []string{"1.2.0", "1.2.9"}, []string{"1.3.0"}},
		{"~1", []string{"1.0.0", "1.9.9"}, []string{"2.0.0"}},
		{"~0.2.3", []string{"0.2.5"}, []string{"0.3.0"}},
		{"*", []string{"0.0.0", "9.9.9"}, []string{"1.0.0-beta"}},
		{"", []string{"1.0.0"}, nil},
		{"x", []string{"1.0.0"}, nil},
		{"1.x", []string{"1.0.0", "1.9.9"}, []string{"2.0.0", "0.9.9"}},
		{"1.2.*", []string{"1.2.0", "1.2.9"}, []string{"1.3.0"}},
		{"1", []string{"1.5.0"}, []string{"2.0.0"}},
		{">1.2.3", []string{"1.2.4"}, []string{"1.2.3"}},
		{">1.2", []string{"1.3.0"}, []string{"1.2.9"}},
		{">=1.2.3", []string{"1.2.3", "5.0.0"}, []string{"1.2.2"}},
		{"<1.2.3", []string{"1.2.2"}, []string{"1.2.3", "1.2.3-beta"}},
		{"<1.2", []string{"1.1.9"}, []string{"1.2.0"}},
		{"<=1.2.3", []string{"1.2.3"}, []string{"1.2.4"}},
		{"<=1.2", []string{"1.2.9"}, []string{"1.3.0"}},
		{">= 1.2.3 < 2", []string{"1.2.3", "1.9.9"}, []string{"2.0.0", "1.2.2"}},
		{">=1.2.3 <1.5.0", []string{"1.4.9"}, []string{"1.5.0"}},
		{"1.2.3 - 2.3.4", []string{"1.2.3", "2.3.4"}, []string{"2.3.5", "1.2.2"}},
		{"1.2 - 2.3", []string{"1.2.0", "2.3.9"}, []string{"2.4.0", "1.1.9"}},
		{"1.2.3 - 2", []string{"2.9.9"}, []string{"3.0.0"}},
		{"^1.0.0 || ^3.0.0", []string{"1.5.0", "3.1.0"}, []string{"2.0.0"}},
		{"1.2.3 || >=2.5.0 <3", []string{"1.2.3", "2.6.0"}, []string{"2.0.0", "3.0.0"}},
		{"v1.2.3", []string{"1.2.3"}, nil},
		{"~>1.2.3", []string{"1.2.9"}, []string{"1.3.0"}},
		{">=1.0.0-rc.1 <1.0.0", []string{"1.0.0-rc.2"}, []string{"0.9.0-rc.1"}},
	}
	for _, c := range cases {
		r, err := ParseRange(c.r)
		if err != nil {
			t.Errorf("%q: %v", c.r, err)
			continue
		}
		for _, s := range c.in {
			v, err := ParseVersion(s)
			if err != nil {
				t.Fatal(err)
			}
			if !r.Satisfies(v) {
				t.Errorf("%q should hold %s", c.r, s)
			}
		}
		for _, s := range c.out {
			v, _ := ParseVersion(s)
			if r.Satisfies(v) {
				t.Errorf("%q should not hold %s", c.r, s)
			}
		}
	}
}

func TestARangeThatIsNotOneIsRefused(t *testing.T) {
	for _, bad := range []string{"latest", "^abc", "1.2.3.4", ">=x.y.z", "1.x-beta"} {
		if _, err := ParseRange(bad); err == nil {
			t.Errorf("%q read as a range", bad)
		}
	}
}

func TestTheHighestSatisfyingVersionIsTheOneARangeResolvesTo(t *testing.T) {
	var vs []Version
	for _, s := range []string{"0.1.0", "0.1.4", "0.2.0", "0.2.1-beta", "1.0.0"} {
		v, _ := ParseVersion(s)
		vs = append(vs, v)
	}
	r, _ := ParseRange("^0.1.0")
	if best, ok := MaxSatisfying(r, vs); !ok || best.String() != "0.1.4" {
		t.Fatalf("^0.1.0 resolved to %v", best)
	}
	r, _ = ParseRange("^2.0.0")
	if _, ok := MaxSatisfying(r, vs); ok {
		t.Fatal("^2.0.0 resolved to something")
	}
}