using System;
using System.Text.Json;
using Godot;

namespace Babushka.scripts.CSharp.Common.Savegame;

/// <summary>
/// Handles the saving and loading of local settings data.
/// </summary>
[GlobalClass]
public partial class SettingsSaveController : Node
{
    public static string SETTINGS_FILE_PATH = "user://userSettings.json";
    public static SettingsSaveController Instance;
    
    public SettingsData? settings = new SettingsData();
    public SettingsData settingsDefault = new SettingsData();
    
    public event Action OnSettingsReloaded;
    
    private bool _loadedData;
    private DateTime _readyTime;

    public bool LoadedData => _loadedData;
    
    public override void _EnterTree()
    {        
        SETTINGS_FILE_PATH = ProjectSettings.GlobalizePath(SETTINGS_FILE_PATH);
        _readyTime = DateTime.Now;
        Instance = this;
        LoadSettings();
    }
    
    public override void _ExitTree()
    {
        if (settings != null) 
            settings.runtimeSeconds += (DateTime.Now - _readyTime).TotalSeconds;
        SaveSettings();
        Instance = null;
    }
    
    /// <summary>
    /// Saves Settings Data onto disk.
    /// </summary>
    public void SaveSettings()
    {
        try
        {
            string jsonString = JsonSerializer.Serialize(
                settings,
                new JsonSerializerOptions() { WriteIndented = true}
            );
        
            System.IO.File.WriteAllText(SETTINGS_FILE_PATH, jsonString);
        }
        catch (Exception e)
        {
            GD.PrintErr("Error Saving Settings:", e);
            Console.WriteLine(e);
        }
    }
    
    /// <summary>
    /// Loads Settings data from disk.
    /// </summary>
    public void LoadSettings()
    {
        _loadedData = false;
        
        try
        {
            if (!System.IO.File.Exists(SETTINGS_FILE_PATH))
            {
                settings = new SettingsData();
            }
            else
            {
                string jsonString = System.IO.File.ReadAllText(SETTINGS_FILE_PATH);
                SettingsData? loadedSettings = JsonSerializer.Deserialize<SettingsData>(jsonString);
                if (loadedSettings != null && !loadedSettings.IsVersionValid())
                {
                    _loadedData = false;
                }
                else
                {
                    settings = loadedSettings;
                    _loadedData = true;   
                }
            }
        }
        catch (Exception e)
        {
            GD.PrintErr("Loading Error:", e);
            Console.WriteLine(e);
        }
        
    }
    
    /// <summary>
    /// Resets Settings to default.
    /// </summary>
    public void ResetSettings()
    {
        settings = JsonSerializer.Deserialize<SettingsData>(JsonSerializer.Serialize<SettingsData>(settingsDefault));
        OnSettingsReloaded?.Invoke();
    }

}