package config

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

func TestLoadDefaultsWhenNoOverlay(t *testing.T) {
	dir := t.TempDir()
	cfg, err := Load(filepath.Join(dir, "missing.yaml"))
	if err != nil {
		t.Fatal(err)
	}
	if cfg.Version != 1 {
		t.Errorf("version = %d", cfg.Version)
	}
	if len(cfg.ExtraPackages) != 0 {
		t.Errorf("extra_packages = %v", cfg.ExtraPackages)
	}
}

func TestLoadMergesOverlay(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "overlay.yaml")
	content := []byte(`
version: 1
extra_packages: [htop, ncdu]
disabled_modules: [renode]
theme_overrides:
  starship: /tmp/mine.toml
`)
	if err := os.WriteFile(path, content, 0o644); err != nil {
		t.Fatal(err)
	}
	cfg, err := Load(path)
	if err != nil {
		t.Fatal(err)
	}
	if got := cfg.ExtraPackages; len(got) != 2 || got[0] != "htop" || got[1] != "ncdu" {
		t.Errorf("extra_packages = %v", got)
	}
	if len(cfg.DisabledModules) != 1 || cfg.DisabledModules[0] != "renode" {
		t.Errorf("disabled_modules = %v", cfg.DisabledModules)
	}
	if cfg.ThemeOverrides["starship"] != "/tmp/mine.toml" {
		t.Errorf("theme_overrides = %v", cfg.ThemeOverrides)
	}
}

func TestLoadRejectsUnknownVersion(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "overlay.yaml")
	if err := os.WriteFile(path, []byte("version: 99\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := Load(path); err == nil {
		t.Fatal("expected version error")
	}
}