package wine

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

func TestInstalledVersion(t *testing.T) {
	root := t.TempDir()
	helper := filepath.Join(root, "wine-access.exe")
	// The launcher must never run, including for old helpers lacking metadata.
	marker := filepath.Join(root, "executed")
	if err := os.WriteFile(helper, []byte("#!/bin/sh\ntouch '"+marker+"'\nexit 99\n"), 0700); err != nil {
		t.Fatal(err)
	}
	t.Setenv("CTHULHU_WINE_ACCESS_HELPER", helper)
	for _, test := range []struct {
		name, declaration, want string
	}{
		{"current", `const char release[] = "2026.10.24";`, "2026.10.24"},
		{"old helper", `int unused;`, ""},
		{"invalid date", `const char release[] = "2026.99.99";`, ""},
		{"oversized", `const char release[] = "2026.10.24 extra";`, ""},
		{"unterminated", `const char release[11] = "2026.10.24x";`, ""},
	} {
		t.Run(test.name, func(t *testing.T) {
			source := "__attribute__((used, section(\".wine_access.version\")))\n" + test.declaration
			if test.name == "old helper" {
				source = test.declaration
			}
			command := exec.Command("cc", "-shared", "-fPIC", "-x", "c", "-o", helper+".so", "-")
			command.Stdin = strings.NewReader(source)
			if output, err := command.CombinedOutput(); err != nil {
				t.Fatalf("compile helper metadata fixture: %v\n%s", err, output)
			}
			if got := InstalledVersion(); got != test.want {
				t.Fatalf("InstalledVersion() = %q, want %q", got, test.want)
			}
			link := filepath.Join(t.TempDir(), "wine-access.exe")
			if err := os.Symlink(helper, link); err != nil {
				t.Fatal(err)
			}
			t.Setenv("CTHULHU_WINE_ACCESS_HELPER", link)
			if got := InstalledVersion(); got != test.want {
				t.Fatalf("symlink InstalledVersion() = %q, want %q", got, test.want)
			}
		})
	}
	if _, err := os.Stat(marker); !os.IsNotExist(err) {
		t.Fatalf("version detection executed the helper: %v", err)
	}
	if err := os.WriteFile(helper+".so", []byte("broken sidecar"), 0600); err != nil {
		t.Fatal(err)
	}
	if got := InstalledVersion(); got != "" {
		t.Fatalf("invalid ELF returned %q", got)
	}
	t.Setenv("CTHULHU_WINE_ACCESS_HELPER", "/usr/bin/true")
	if got := InstalledVersion(); got != "" {
		t.Fatalf("missing sidecar returned %q", got)
	}
}