package envfile

import (
	"os"
	"path/filepath"
	"testing"
)

func TestAFileTwinIsPreferredAndOnlyItsLineEndingGoes(t *testing.T) {
	path := filepath.Join(t.TempDir(), "value")
	if err := os.WriteFile(path, []byte(" amqp://u:p@h/ \n"), 0o600); err != nil {
		t.Fatal(err)
	}
	t.Setenv("MESH_X", "")
	t.Setenv("MESH_X_FILE", path)
	got, err := Value("MESH_X")
	if err != nil || got != " amqp://u:p@h/ " {
		t.Fatalf("got %q, %v", got, err)
	}
}

func TestThePlainVariableStillWorks(t *testing.T) {
	t.Setenv("MESH_Y", " plain ")
	if got, err := Value("MESH_Y"); err != nil || got != "plain" {
		t.Fatalf("got %q, %v", got, err)
	}
}

func TestBothSetIsRefused(t *testing.T) {
	path := filepath.Join(t.TempDir(), "value")
	_ = os.WriteFile(path, []byte("a"), 0o600)
	t.Setenv("MESH_Z", "b")
	t.Setenv("MESH_Z_FILE", path)
	if _, err := Value("MESH_Z"); err == nil {
		t.Fatal("two sources were accepted")
	}
}

func TestAMissingFileIsSaid(t *testing.T) {
	t.Setenv("MESH_W_FILE", filepath.Join(t.TempDir(), "absent"))
	if _, err := Value("MESH_W"); err == nil {
		t.Fatal("a missing file produced a value")
	}
}