u3d-master-2d-book/Assets/Scripts/Navigation/NavigationManager.cs

using System.Collections.Generic;
using UnityEngine.SceneManagement;

/// <summary>
/// Maintains information about each possible destination (scene) in the game
/// </summary>
public struct Route
{
    public string RouteDescription;
    public bool CanTravel;
}

public static class NavigationManager
{
    /// <summary>
    /// This dictioanry defines all destinations that exist in the game.
    /// </summary>
    public static Dictionary<string, Route> RouteInformation = new Dictionary<string, Route>()
    {
        { "Overworld", new Route { RouteDescription = "The big bad world", CanTravel = true } },
        { "Construction", new Route { RouteDescription = "The construction area", CanTravel = false } },
        { "Town", new Route { RouteDescription = "The main town", CanTravel = true } },
        { "Campsite", new Route { RouteDescription = "The campsite", CanTravel = true } },
    };

    /// <summary>
    /// Searches the dictionary to find if the given destination is defined.
    /// </summary>
    /// <param name="destination"></param>
    /// <returns></returns>
    public static string GetRouteInfo(string destination)
    {
        return RouteInformation.ContainsKey(destination) ? RouteInformation[destination].RouteDescription : null;
    }

    /// <summary>
    /// Determines whether the given destination can be travelled to or not.
    /// </summary>
    /// <param name="destination"></param>
    /// <returns></returns>
    public static bool CanNavigate(string destination)
    {
        return RouteInformation.ContainsKey(destination) ? RouteInformation[destination].CanTravel : false;
    }

    /// <summary>
    /// This method performs the action of loading a new scene. The destination value needs
    /// to match the name of a scene in the project. 
    /// </summary>
    /// <param name="destination"></param>
    public static void NavigateTo(string destination)
    {
        SceneManager.LoadScene(destination);
    }
}