using System;
using DesertPaintCodex.Models;
using DesertPaintCodex.Util;
using System.Collections.Generic;
using System.IO;

namespace DesertPaintCodex.Services
{
    internal static class ProfileManager
    {
        private static bool _areProfilesLoaded;
        private static readonly List<string> _profileList = new();
        
        public static PlayerProfile? CurrentProfile { get; private set; }
        public static bool HasProfileLoaded => CurrentProfile != null;

        public static List<string> GetProfileList()
        {
            // If it's already loaded, return the cached list.
            if (_areProfilesLoaded)
            {
                return _profileList;
            }

            // Otherwise, load the list.
            string appDataPath = FileUtils.AppDataPath;
            if (!Directory.Exists(appDataPath))
            {
                Directory.CreateDirectory(appDataPath);
            }

            DirectoryInfo di = new(appDataPath);
            DirectoryInfo[] dirs = di.GetDirectories();
            foreach (DirectoryInfo dir in dirs)
            {
                if (dir.Name != "template")
                {
                    _profileList.Add(dir.Name);
                }
            }

            _areProfilesLoaded = true;
            return _profileList;
        }

        public static PlayerProfile LoadProfile(string name)
        {
            CurrentProfile = new PlayerProfile(name, Path.Combine(FileUtils.AppDataPath, name));
            CurrentProfile.Load();
            return CurrentProfile;
        }

        public static void ReloadProfile()
        {
            if (CurrentProfile == null) return;
            LoadProfile(CurrentProfile.Name);
        }

        public static PlayerProfile CreateNewProfile(string name)
        {
            CurrentProfile = new PlayerProfile(name, Path.Combine(FileUtils.AppDataPath, name));
            CurrentProfile.Initialize();
            // Invalidate profile list, so it will reload next time.
            _profileList.Clear();
            _areProfilesLoaded = false;
            return CurrentProfile;
        }

        public static int GetProfileCount()
        {
            // This is a function instead of a property, because it may be slow.
            List<string> profiles = GetProfileList();
            return profiles.Count;
        }

        public static bool HasProfiles()
        {
            // This is a function instead of a property, because it may be slow.
            List<string> profiles = GetProfileList();
            return profiles.Count > 0;
        }

        public static void UnloadProfile()
        {
            CurrentProfile = null;
        }

    }
}