SethDiscordBot/DiscordBotCore/Application.cs

using DiscordBotCore.Interfaces.PluginManager;
using DiscordBotCore.Online;
using DiscordBotCore.Others;
using DiscordBotCore.Others.Actions;
using DiscordBotCore.Others.Logger;
using DiscordBotCore.Plugin;

using System;
using System.Collections.Generic;
using System.IO;
using System.Threading.Tasks;
using DiscordBotCore.Others.Exceptions;


namespace DiscordBotCore
{
    /// <summary>
    /// The main Application and its components
    /// </summary>
    public sealed class Application
    {
        public static Application CurrentApplication { get; private set; } = null!;

        private static readonly string _DefaultLogMessageFormat = "{ThrowTime} {SenderName} {Message}";
        private static readonly string _ConfigFile = "./Data/Resources/config.json";
        private static readonly string _PluginsDatabaseFile = "./Data/Resources/plugins.json";

        private static readonly string _ResourcesFolder = "./Data/Resources";
        private static readonly string _PluginsFolder = "./Data/Plugins";
        private static readonly string _ArchivesFolder = "./Data/Archives";
        private static readonly string _LogsFolder = "./Data/Logs";

        private static readonly string _MaxParallelDownloads = "3";

        public string ServerID => ApplicationEnvironmentVariables["ServerID"];
        public string PluginDatabase => ApplicationEnvironmentVariables["PluginDatabase"] ?? _PluginsDatabaseFile;
        public string LogFile => $"{ApplicationEnvironmentVariables["LogFolder"]}/{DateTime.Now.ToLongDateString().Replace(" / ", "")}.log";

        public SettingsDictionary<string, string> ApplicationEnvironmentVariables { get; private set; }
        public InternalActionManager InternalActionManager { get; private set; }
        public IPluginManager PluginManager { get; private set; }
        public Logger Logger { get; private set; }
        public Bot.App DiscordBotClient { get; internal set; }

        public static async Task CreateApplication()
        {
            if (CurrentApplication is not null)
                return;

            CurrentApplication = new Application();

            Directory.CreateDirectory(_ResourcesFolder);
            Directory.CreateDirectory(_PluginsFolder);
            Directory.CreateDirectory(_ArchivesFolder);
            Directory.CreateDirectory(_LogsFolder);

            CurrentApplication.ApplicationEnvironmentVariables = new SettingsDictionary<string, string>(_ConfigFile);
            bool result = await CurrentApplication.ApplicationEnvironmentVariables.LoadFromFile();
            if(!result)
            {
                PopulateEnvWithDefault();
                File.Delete(_ConfigFile);
                await CurrentApplication.ApplicationEnvironmentVariables.SaveToFile();
            }

            CurrentApplication.Logger = CurrentApplication.ApplicationEnvironmentVariables.ContainsKey("LogMessageFormat") ?
                                        new Logger(CurrentApplication.ApplicationEnvironmentVariables["LogMessageFormat"]) :
                                        new Logger(_DefaultLogMessageFormat);
            
            if (!File.Exists(_PluginsDatabaseFile))
            {
                List<PluginInfo> plugins = new();
                await JsonManager.SaveToJsonFile(_PluginsDatabaseFile, plugins);
            }

            
#if DEBUG
            CurrentApplication.PluginManager = new PluginManager("tests");
#else
            CurrentApplication.PluginManager = new PluginManager();
#endif
            await CurrentApplication.PluginManager.UninstallMarkedPlugins();
            await CurrentApplication.PluginManager.CheckForUpdates();

            CurrentApplication.InternalActionManager = new InternalActionManager();
            await CurrentApplication.InternalActionManager.Initialize();


        }


        private static void PopulateEnvWithDefault()
        {
            if (CurrentApplication is null)
                return;

            if (CurrentApplication.ApplicationEnvironmentVariables is null)
                return;


            CurrentApplication.ApplicationEnvironmentVariables["LogFolder"] = _LogsFolder;
            CurrentApplication.ApplicationEnvironmentVariables["PluginFolder"] = _PluginsFolder;
            CurrentApplication.ApplicationEnvironmentVariables["ArchiveFolder"] = _ArchivesFolder;
            CurrentApplication.ApplicationEnvironmentVariables["PluginDatabase"] = _PluginsDatabaseFile;
            CurrentApplication.ApplicationEnvironmentVariables["LogMessageFormat"] = _DefaultLogMessageFormat;
            CurrentApplication.ApplicationEnvironmentVariables["MaxParallelDownloads"] = _MaxParallelDownloads;
        }

        public static string GetResourceFullPath(string path)
        {
            string result = Path.Combine(_ResourcesFolder, path);
            return result;
        }

        public static string GetResourceFullPath() => _ResourcesFolder;

        public static string GetPluginFullPath(string path)
        {
            string result = Path.Combine(_PluginsFolder, path);
            return result;
        }

        public static string GetPluginFullPath() => _PluginsFolder;

        public static async Task<string> GetPluginDependencyPath(string dependencyName, string? pluginName = null)
        {
            string? dependencyLocation;
            if(pluginName is null)
                dependencyLocation = await Application.CurrentApplication.PluginManager.GetDependencyLocation(dependencyName);
            else
                dependencyLocation = await Application.CurrentApplication.PluginManager.GetDependencyLocation(dependencyName, pluginName);
            
            if(dependencyLocation is null)
                throw new DependencyNotFoundException($"Dependency {dependencyName} not found", pluginName);
            
            return dependencyLocation;
        }
    }
}