package app

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

func TestWriteMCPConfigUsesRuntimeDir(t *testing.T) {
	runtimeDir := t.TempDir()
	configHome := filepath.Join(t.TempDir(), "config")
	t.Setenv("XDG_RUNTIME_DIR", runtimeDir)
	t.Setenv("XDG_CONFIG_HOME", configHome)

	l := &Launcher{bin: "patterm", mcpSocket: "/tmp/patterm.sock"}
	path, err := l.writeMCPConfig("abc123")
	if err != nil {
		t.Fatalf("writeMCPConfig: %v", err)
	}
	if !strings.HasPrefix(path, filepath.Join(runtimeDir, "patterm", "agents", "abc123")) {
		t.Fatalf("path = %q, want under runtime dir", path)
	}
	if _, err := os.Stat(path); err != nil {
		t.Fatalf("config file stat: %v", err)
	}
	if _, err := os.Stat(filepath.Join(configHome, "patterm")); !os.IsNotExist(err) {
		t.Fatalf("writeMCPConfig created XDG config dir or unexpected stat error: %v", err)
	}
}