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

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

    public 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("프리셋 이름은 비어 있을 수 없습니다.");
            }

            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>();
            string dir = GetPresetsDirectory();
            if (!Directory.Exists(dir))
            {
                return presets;
            }

            try
            {
                string[] files = Directory.GetFiles(dir, "*.json");
                foreach (string file in files)
                {
                    try
                    {
                        string json = File.ReadAllText(file);
                        var preset = JsonConvert.DeserializeObject<RenderPreset>(json);
                        if (preset != null && !string.IsNullOrEmpty(preset.Name) && preset.Config != null)
                        {
                            presets.Add(preset);
                        }
                    }
                    catch (Exception ex)
                    {
                        MelonLogger.Warning($"프리셋 파일 '{Path.GetFileName(file)}' 로드 중 오류 발생: {ex.Message}");
                    }
                }
            }
            catch (Exception ex)
            {
                MelonLogger.Error($"프리셋 목록을 불러오는 중 오류 발생: {ex.Message}");
            }

            return presets;
        }

        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);
            }
        }
    }
}