using DiscordBotCore.Logging;
using DiscordBotCore.Networking;
using DiscordBotCore.PluginManagement.Helpers;
using DiscordBotCore.PluginManagement.Models;
using DiscordBotCore.Utilities;
using DiscordBotCore.Configuration;
using OperatingSystem = DiscordBotCore.Utilities.OperatingSystem;

namespace DiscordBotCore.PluginManagement;

public sealed class PluginManager : IPluginManager
{
    private static readonly string _LibrariesBaseFolder = "Libraries";
    private readonly IPluginRepository _PluginRepository;
    private readonly ILogger _Logger;
    private readonly IConfiguration _Configuration;
    
    public PluginManager(IPluginRepository pluginRepository, ILogger logger, IConfiguration configuration)
    {
        _PluginRepository = pluginRepository;
        _Logger = logger;
        _Configuration = configuration;
    }

    public async Task<List<OnlinePlugin>> GetPluginsList()
    {
        int os = OperatingSystem.GetOperatingSystemInt();
        var onlinePlugins = await _PluginRepository.GetAllPlugins(os, false);
        
        if (!onlinePlugins.Any())
        {
            _Logger.Log($"No plugins found for operatingSystem: {OperatingSystem.GetOperatingSystemString((OperatingSystem.OperatingSystemEnum)os)}", LogType.Warning);
            return [];
        }

        return onlinePlugins;
    }

    public async Task<OnlinePlugin?> GetPluginDataByName(string pluginName)
    {
        int os = OperatingSystem.GetOperatingSystemInt();
        var plugin = await _PluginRepository.GetPluginByName(pluginName, os, false);

        if (plugin == null)
        {
            _Logger.Log($"Plugin {pluginName} not found in the repository for operating system {OperatingSystem.GetOperatingSystemString((OperatingSystem.OperatingSystemEnum)os)}.", LogType.Warning);
            return null;
        }

        return plugin;
    }

    public async Task<OnlinePlugin?> GetPluginDataById(int pluginId)
    {
        var plugin = await _PluginRepository.GetPluginById(pluginId);
        if (plugin is null)
        {
            _Logger.Log($"Plugin {pluginId} not found in the repository.", this, LogType.Warning);
            return null;
        }
        
        return plugin;
    }

    private async Task RemovePluginFromDatabase(string pluginName)
    {
        string? pluginDatabaseFile = _Configuration.Get<string>("PluginDatabase");

        if (pluginDatabaseFile is null)
        {
            throw new Exception("Plugin database file not found");
        }
        
        List<LocalPlugin> installedPlugins = await JsonManager.ConvertFromJson<List<LocalPlugin>>(await File.ReadAllTextAsync(pluginDatabaseFile));

        installedPlugins.RemoveAll(p => p.PluginName == pluginName);
        await JsonManager.SaveToJsonFile(pluginDatabaseFile, installedPlugins);
    }

    public async Task AppendPluginToDatabase(LocalPlugin pluginData)
    {
        string? pluginDatabaseFile = _Configuration.Get<string>("PluginDatabase");
        if (pluginDatabaseFile is null)
        {
            throw new Exception("Plugin database file not found");
        }

        List<LocalPlugin> installedPlugins = await GetInstalledPlugins();
        
        foreach (var dependency in pluginData.ListOfExecutableDependencies)
        {
            pluginData.ListOfExecutableDependencies[dependency.Key] = dependency.Value;
        }

        installedPlugins.Add(pluginData);
        await JsonManager.SaveToJsonFile(pluginDatabaseFile, installedPlugins);
    }

    public async Task<List<LocalPlugin>> GetInstalledPlugins()
    {
        string? pluginDatabaseFile = _Configuration.Get<string>("PluginDatabase");
        if (pluginDatabaseFile is null)
        {
            _Logger.Log("Plugin database file path is not present in the config file", this, LogType.Warning);
            return [];
        }

        if (!File.Exists(pluginDatabaseFile))
        {
            _Logger.Log("Plugin database file not found", this, LogType.Warning);
            await CreateEmptyPluginDatabase();
            return [];
        }
        
        return await JsonManager.ConvertFromJson<List<LocalPlugin>>(await File.ReadAllTextAsync(pluginDatabaseFile));
    }

    public async Task<bool> IsPluginInstalled(string pluginName)
    {
        string? pluginDatabaseFile = _Configuration.Get<string>("PluginDatabase");
        if (pluginDatabaseFile is null)
        {
            throw new Exception("Plugin database file not found");
        }
        
        List<LocalPlugin> installedPlugins = await JsonManager.ConvertFromJson<List<LocalPlugin>>(await File.ReadAllTextAsync(pluginDatabaseFile));
        return installedPlugins.Any(plugin => plugin.PluginName == pluginName);
    }

    public async Task<string?> GetDependencyLocation(string dependencyName)
    {
        List<LocalPlugin> installedPlugins = await GetInstalledPlugins();

        foreach (var plugin in installedPlugins)
        {
            if (plugin.ListOfExecutableDependencies.TryGetValue(dependencyName, out var dependencyPath))
            {
                string relativePath = GenerateDependencyRelativePath(plugin.PluginName, dependencyPath);
                return relativePath;
            }
        }

        return null;
    }
    
    public async Task<string?> GetDependencyLocation(string dependencyName, string pluginName)
    {
        List<LocalPlugin> installedPlugins = await GetInstalledPlugins();

        foreach (var plugin in installedPlugins)
        {
            if (plugin.PluginName == pluginName && plugin.ListOfExecutableDependencies.ContainsKey(dependencyName))
            {
                string dependencyPath     = plugin.ListOfExecutableDependencies[dependencyName];
                string relativePath = GenerateDependencyRelativePath(pluginName, dependencyPath); 
                return relativePath;
            }
        }

        return null;
    }

    public string GenerateDependencyRelativePath(string pluginName, string dependencyPath)
    {
        string relative = $"./{_LibrariesBaseFolder}/{pluginName}/{dependencyPath}";
        return relative;
    }

    public async Task InstallPlugin(OnlinePlugin plugin, IProgress<float> progress)
    {
        string? pluginsFolder = _Configuration.Get<string>("PluginFolder");
        if (pluginsFolder is null)
        {
            throw new Exception("Plugin folder not found");
        }
        
        List<OnlineDependencyInfo> dependencies = await _PluginRepository.GetDependenciesForPlugin(plugin.Id);
        
        string downloadLocation = $"{pluginsFolder}/{plugin.Name}.dll";
        
        IProgress<float> downloadProgress = new Progress<float>(progress.Report);
        
        FileDownloader fileDownloader = new FileDownloader(plugin.DownloadLink, downloadLocation);
        await fileDownloader.DownloadFile(downloadProgress.Report);

        ParallelDownloadExecutor executor = new ParallelDownloadExecutor();

        foreach (var dependency in dependencies)
        {
            string dependencyLocation = GenerateDependencyRelativePath(plugin.Name, dependency.DownloadLocation);
            
            executor.AddTask(dependency.DownloadLink, dependencyLocation, progress.Report);
        }
        
        await executor.ExecuteAllTasks();
        
        LocalPlugin localPlugin = LocalPlugin.FromOnlineInfo(plugin, dependencies, downloadLocation);
        await AppendPluginToDatabase(localPlugin);
    }

    public async Task SetEnabledStatus(string pluginName, bool status)
    {
        var plugins = await GetInstalledPlugins();
        var plugin = plugins.Find(p => p.PluginName == pluginName);

        if (plugin == null)
            return;

        plugin.IsEnabled = status;

        await RemovePluginFromDatabase(pluginName);
        await AppendPluginToDatabase(plugin);

    }

    public async Task<bool> UninstallPluginByName(string pluginName)
    {
        var localPlugin = await GetLocalPluginByName(pluginName);
        if (localPlugin == null)
        {
            return false;
        }
        
        File.Delete(localPlugin.FilePath);

        if (Directory.Exists($"./{_LibrariesBaseFolder}/{pluginName}"))
        {
            foreach (var file in Directory.EnumerateFiles($"./{_LibrariesBaseFolder}/{pluginName}"))
            {
                File.Delete(file);
            }
        }
        
        await RemovePluginFromDatabase(pluginName);
        
        _Logger.Log($"Plugin {pluginName} uninstalled successfully", this, LogType.Info);

        return true;
    }

    public async Task<LocalPlugin?> GetLocalPluginByName(string pluginName)
    {
        List<LocalPlugin> installedPlugins = await GetInstalledPlugins();
        var plugin = installedPlugins.Find(p => p.PluginName == pluginName);

        if (plugin == null)
        {
            _Logger.Log($"Plugin {pluginName} not found in the database", this, LogType.Warning);
            return null;
        }

        return plugin;
    }

    private async Task<bool> CreateEmptyPluginDatabase()
    {
        string ? pluginDatabaseFile = _Configuration.Get<string>("PluginDatabase");
        if (pluginDatabaseFile is null)
        {
            _Logger.Log("Plugin database file path is not present in the config file", this, LogType.Warning);
            return false;
        }
        
        if (File.Exists(pluginDatabaseFile))
        {
            _Logger.Log("Plugin database file already exists", this, LogType.Warning);
            return false;
        }
        
        List<LocalPlugin> installedPlugins = new List<LocalPlugin>();
        await JsonManager.SaveToJsonFile(pluginDatabaseFile, installedPlugins);
        _Logger.Log("Plugin database file created", this, LogType.Info);
        return true;
    }
}