package config

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

func TestLoadDefaultsWhenMissing(t *testing.T) {
	cfg, err := Load("does-not-exist.toml")
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}
	if cfg.OSC.Host != "127.0.0.1" || cfg.OSC.Port != 9001 {
		t.Fatalf("unexpected defaults: %+v", cfg.OSC)
	}
}

func TestLoadOSCValues(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	if err := os.WriteFile(path, []byte("[osc]\nhost = \"0.0.0.0\"\nport = 9002\n"), 0o600); err != nil {
		t.Fatalf("WriteFile: %v", err)
	}
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}
	if cfg.OSC.Host != "0.0.0.0" || cfg.OSC.Port != 9002 {
		t.Fatalf("unexpected values: %+v", cfg.OSC)
	}
}

func TestLoadGUIValues(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	if err := os.WriteFile(path, []byte("[gui]\ntop_most = true\nfont_size = 24\n"), 0o600); err != nil {
		t.Fatalf("WriteFile: %v", err)
	}
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}
	if cfg.GUI.TopMost != true || cfg.GUI.FontSize != 24 {
		t.Fatalf("unexpected gui values: %+v", cfg.GUI)
	}
}

func TestSaveGUIUpdatesSection(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "config.toml")
	initial := []byte("[self]\nname = \"alice\"\n\n[gui]\ntop_most = false\nfont_size = 18\n")
	if err := os.WriteFile(path, initial, 0o600); err != nil {
		t.Fatalf("WriteFile: %v", err)
	}
	if err := SaveGUI(path, GUIConfig{TopMost: true, FontSize: 26}); err != nil {
		t.Fatalf("SaveGUI returned error: %v", err)
	}
	cfg, err := Load(path)
	if err != nil {
		t.Fatalf("Load returned error: %v", err)
	}
	if cfg.GUI.TopMost != true || cfg.GUI.FontSize != 26 {
		t.Fatalf("unexpected saved gui values: %+v", cfg.GUI)
	}
	data, err := os.ReadFile(path)
	if err != nil {
		t.Fatalf("ReadFile: %v", err)
	}
	text := string(data)
	if !strings.Contains(text, "[self]") || !strings.Contains(text, "name = \"alice\"") {
		t.Fatalf("non-gui config content was lost: %s", text)
	}
}