package datekeys

import (
	"os"
	"runtime/debug"
	"strings"
	"testing"
)

// SpecVersion names the specification of this repository: its file, its
// title and its record in spec/README.md.
func TestSpecVersionNamesTheSpecification(t *testing.T) {
	spec, err := os.ReadFile("spec/DateKeys_Protocol_Specification_v" + SpecVersion + ".md")
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(spec), "### Borrador normativo v"+SpecVersion+"\n") {
		t.Error("the specification is not titled v" + SpecVersion)
	}
	readme, err := os.ReadFile("spec/README.md")
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(readme), "draft v"+SpecVersion+" (") {
		t.Error("spec/README.md does not record v" + SpecVersion)
	}
}

func TestModulePath(t *testing.T) {
	if modulePath != "g.activething.com/go/DateKeys" {
		t.Fatalf("module path %q", modulePath)
	}
}

func TestVersion(t *testing.T) {
	if Version() == "" {
		t.Fatal("empty version")
	}
	other := debug.Module{Path: "example.com/app", Version: "v1.2.3"}
	for _, tc := range []struct {
		name string
		info debug.BuildInfo
		want string
	}{
		{"the main module, tagged", debug.BuildInfo{Main: debug.Module{Path: modulePath, Version: "v0.1.0"}}, "v0.1.0"},
		{"the main module, from a checkout", debug.BuildInfo{Main: debug.Module{Path: modulePath, Version: "v0.0.0-20260928125528-9ac9cd952f04"}},
			"v0.0.0-20260928125528-9ac9cd952f04"},
		{"the main module in a test", debug.BuildInfo{Main: debug.Module{Path: modulePath}}, "(devel)"},
		{"a dependency", debug.BuildInfo{Main: other, Deps: []*debug.Module{{Path: modulePath, Version: "v0.2.0"}}}, "v0.2.0"},
		{"replaced by another version", debug.BuildInfo{Main: other, Deps: []*debug.Module{
			{Path: modulePath, Version: "v0.2.0", Replace: &debug.Module{Path: modulePath, Version: "v0.2.1"}}}}, "v0.2.1"},
		{"replaced by a directory", debug.BuildInfo{Main: other, Deps: []*debug.Module{
			{Path: modulePath, Version: "v0.2.0", Replace: &debug.Module{Path: "../datekeys-go"}}}}, "(devel)"},
		{"not in the program", debug.BuildInfo{Main: other}, "(devel)"},
	} {
		if got := versionIn(&tc.info); got != tc.want {
			t.Errorf("%s: %q, want %q", tc.name, got, tc.want)
		}
	}
}