package main

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

func TestLoadConfig_Defaults(t *testing.T) {
	// The skeleton loadConfig applies defaults when host/port are zero-value.
	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")
	if err := os.WriteFile(path, []byte("server:\n  host: \"\"\n  port: 0\n"), 0644); err != nil {
		t.Fatalf("failed to write config: %v", err)
	}

	cfg, err := loadConfig(path)
	if err != nil {
		t.Fatalf("loadConfig returned error: %v", err)
	}

	if cfg.Server.Host != "0.0.0.0" {
		t.Errorf("expected default host 0.0.0.0, got %q", cfg.Server.Host)
	}
	if cfg.Server.Port != 8080 {
		t.Errorf("expected default port 8080, got %d", cfg.Server.Port)
	}
}

func TestLoadConfig_FileNotFound(t *testing.T) {
	_, err := loadConfig("/nonexistent/path/config.yaml")
	if err == nil {
		t.Fatal("expected error for missing file, got nil")
	}
}

func TestParseYAML_Empty(t *testing.T) {
	var cfg placeholderConfig
	err := parseYAML([]byte(""), &cfg)
	if err != nil {
		t.Fatalf("parseYAML returned error for empty input: %v", err)
	}
}