ADOFAIRenderer/Data/PresetManager.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using MelonLoader;
using MelonLoader.Utils;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

namespace ADOFAIRenderer.Data;

internal class RenderPreset
{
    public string Name { get; set; } = string.Empty;
    public RenderConfig Config { get; set; } = null!;
}

internal static class PresetManager
{
    private static string GetPresetsDirectory()
    {
        return Path.Combine(MelonEnvironment.GameRootDirectory, "UserData", "ADOFAIRenderer", "Presets");
    }

    private static string GetSafeFileName(string name)
    {
        return Path.GetInvalidFileNameChars().Aggregate(name, (current, c) => current.Replace(c, '_'));
    }

    public static void SavePreset(string name, RenderConfig config)
    {
        if (string.IsNullOrWhiteSpace(name))
        {
            throw new ArgumentException("Preset name cannot be empty.");
        }

        string dir = GetPresetsDirectory();
        if (!Directory.Exists(dir))
        {
            Directory.CreateDirectory(dir);
        }

        var preset = new RenderPreset
        {
            Name = name,
            Config = config
        };

        string json = JsonConvert.SerializeObject(preset, Formatting.Indented);
        string safeName = GetSafeFileName(name);
        string filePath = Path.Combine(dir, safeName + ".json");
        File.WriteAllText(filePath, json);
    }

    public static List<RenderPreset> GetPresets()
    {
        var presets = new List<RenderPreset>();
        var dir = GetPresetsDirectory();
            
        if (!Directory.Exists(dir)) return presets;

        try
        {
            var files = Directory.GetFiles(dir, "*.json");
            foreach (var file in files)
            {
                try
                {
                    var json = File.ReadAllText(file);
                    var jObject = JsonConvert.DeserializeObject<JObject>(json);
                    if (jObject == null) continue;
                        
                    var configToken = jObject["Config"];
                    if (configToken is JObject configObj)
                    {
                        TryChangeKey(configObj, "DelayAfterLevelEnd", "DelayAfterEnd");
                            
                        // 1. legacy EncodingConfig -> VideoConfig
                        if (configObj["EncodingConfig"] is JObject oldEncodingConfigObj)
                        {
                            configObj["VideoConfig"] ??= oldEncodingConfigObj;
                            configObj.Remove("EncodingConfig");
                        }

                        // 2. legacy top-level Codec -> VideoConfig.Codec
                        var legacyCodecToken = configObj["Codec"];
                        if (legacyCodecToken != null && legacyCodecToken.Type != JTokenType.Null)
                        {
                            if (configObj["VideoConfig"] == null || configObj["VideoConfig"]!.Type == JTokenType.Null)
                            {
                                configObj["VideoConfig"] = new JObject();
                            }
                                    
                            var videoConfigObj = (JObject)configObj["VideoConfig"]!;
                            videoConfigObj["Codec"] ??= legacyCodecToken;
                                    
                            configObj.Remove("Codec");
                        }

                        // 3. legacy top-level Audio properties -> AudioConfig
                        string[] legacyAudioProps = { "RenderAudio", "AudioSampleRate", "AudioChannels", "AudioBitrate" };
                        foreach (var prop in legacyAudioProps)
                        {
                            var legacyToken = configObj[prop];
                            if (legacyToken != null && legacyToken.Type != JTokenType.Null)
                            {
                                if (configObj["AudioConfig"] == null || configObj["AudioConfig"]!.Type == JTokenType.Null)
                                {
                                    configObj["AudioConfig"] = new JObject();
                                }

                                var audioConfigObj = (JObject)configObj["AudioConfig"]!;
                                audioConfigObj[prop] ??= legacyToken;
                            }

                            configObj.Remove(prop);
                        }

                        if (configObj["AudioConfig"] != null && configObj["AudioConfig"]!.Type == JTokenType.Null)
                        {
                            configObj.Remove("AudioConfig");
                        }

                        // 4. legacy top-level Advanced properties -> AdvancedConfig
                        string[] legacyAdvancedProps = { "RandomSeed", "ProcessAudio", "NonTile" };
                        foreach (var prop in legacyAdvancedProps)
                        {
                            var legacyToken = configObj[prop];
                            if (legacyToken != null && legacyToken.Type != JTokenType.Null)
                            {
                                if (configObj["AdvancedConfig"] == null || configObj["AdvancedConfig"]!.Type == JTokenType.Null)
                                {
                                    configObj["AdvancedConfig"] = new JObject();
                                }

                                var advancedConfigObj = (JObject)configObj["AdvancedConfig"]!;
                                advancedConfigObj[prop] ??= legacyToken;
                            }

                            configObj.Remove(prop);
                        }

                        if (configObj["AdvancedConfig"] != null && configObj["AdvancedConfig"]!.Type == JTokenType.Null)
                        {
                            configObj.Remove("AdvancedConfig");
                        }
                    }
                            
                    var preset = jObject.ToObject<RenderPreset>();
                    if (preset != null && !string.IsNullOrEmpty(preset.Name))
                    {
                        presets.Add(preset);
                    }
                }
                catch (Exception ex)
                {
                    MelonLogger.Warning($"Error loading preset file '{Path.GetFileName(file)}': {ex.Message}");
                }
            }
        }
        catch (Exception ex)
        {
            MelonLogger.Error($"Error retrieving preset list: {ex.Message}");
        }

        return presets;
    }

    private static void TryChangeKey(JObject configObj, string keyBefore, string targetKey)
    {
        var legacyToken = configObj[keyBefore];
        if (legacyToken != null && legacyToken.Type != JTokenType.Null)
            configObj[targetKey] = legacyToken;

        configObj.Remove(keyBefore);
    }

    public static void DeletePreset(string name)
    {
        string dir = GetPresetsDirectory();
        string safeName = GetSafeFileName(name);
        string filePath = Path.Combine(dir, safeName + ".json");

        if (File.Exists(filePath))
        {
            File.Delete(filePath);
        }
    }
}