using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;
using Avalonia.Controls;
using Avalonia.Platform.Storage;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using CrossLangDevStudio.Messages;
using CrossLangDevStudio.Models;
using CrossLangDevStudio.Views;

namespace CrossLangDevStudio.ViewModels;

public partial class MainWindowViewModel : ViewModelBase
{

    public HttpClient Client { get; set; } = new();
    public string CurrentProject { get; set; } = "";
    public Func<object> NewItemFactory => AddItem;


    public ObservableCollection<TabItemViewModel> TabItems { get; } = new();
    public ObservableCollection<ProjectFileNode> ProjectFiles { get; } = new ObservableCollection<ProjectFileNode>();

    public EventHandler<Tabalonia.Events.CloseLastTabEventArgs>? Closed { get; } = null;

    public TabItemViewModel WelcomePage
    {
        get
        {
            return new TabItemViewModel()
            {
                Header = "Welcome",
                Body = new WelcomeViewModel(this)
            };
        }
    }
    private ProjectFileNode? _selectedProjectFile = null;

    public ProjectFileNode? SelectedProjectFile
    {
        get => _selectedProjectFile;
        set
        {
            _selectedProjectFile = value;
            value?.Click?.Invoke();
        }
    }


    public MainWindowViewModel(string[] args)
    {
        if (args.Length == 1)
        {
            LoadProject(args[0]);
        }
        if (string.IsNullOrWhiteSpace(CurrentProject))
                this.TabItems.Add(WelcomePage);
    }


    private object AddItem()
    {
        var tab = new TabItemViewModel
        {
            Header = "New Tab",

        };
        if (Directory.Exists(CurrentProject))
        {
            var newTabItem = new NewTabViewModel(this, tab);
            tab.Body = newTabItem;
        }
        


        return tab;
    }

    internal void LoadProject(string obj)
    {
        if (!File.Exists(Path.Combine(obj, "cross.json")))
        {
            return;
        }
        CrossLangShell.EnsureRecent(obj);
        CurrentProject = obj.TrimEnd(Path.DirectorySeparatorChar);
        Refresh(CurrentProject);
    }
    [RelayCommand]
    public void RefreshListing()
    {
        if (!File.Exists(Path.Combine(CurrentProject, "cross.json")))
        {
            return;
        }
        Refresh(CurrentProject);
    }

    private void Refresh(string obj)
    {
        


        for (int i = 0; i < TabItems.Count; i++)
        {
            if (TabItems[i].Body is WelcomeViewModel)
            {
                TabItems.RemoveAt(i);
                i--;
            }

        }

        ObservableCollection<ProjectFileNode> entries = new ObservableCollection<ProjectFileNode>
        {
            new ProjectFileNode("Project",[
                new ProjectFileNode("Configuration",()=>{

                    OpenProjectConfig();
                }),
                new ProjectFileNode("Packages")
            ])

        };

        void Itterate(ObservableCollection<ProjectFileNode> nodes, string dir)
        {

            foreach (var item in Directory.EnumerateDirectories(dir))
            {
                ObservableCollection<ProjectFileNode> files = new();
                Itterate(files, item);
                var pfn = new ProjectFileNode(Path.GetFileName(item), files);
                nodes.Add(pfn);
            }
            foreach (var item in Directory.EnumerateFiles(dir))
            {
                nodes.Add(new ProjectFileNode(Path.GetFileName(item), () =>
                {
                    OpenFile(item);
                }));
            }

        }
        Itterate(entries, obj);
        ProjectFiles.Clear();
        ProjectFiles.Add(new ProjectFileNode(Path.GetFileName(obj), entries));
    }

    private void OpenProjectConfig()
    {
        
        if (Directory.Exists(CurrentProject))
        {
            var config = Path.Combine(CurrentProject, "cross.json");
            foreach (var item in TabItems)
            {
                if (item.Body is ProjectConfigurationViewModel model && model.FilePath == config)
                {
                    return;
                }
            }
            TabItemViewModel vm = new TabItemViewModel();
            vm.Header = "Project Configuration";
            var pcm = new ProjectConfigurationViewModel(config, vm);
           
            vm.Body = pcm;

            AddTab(vm);
        }
    }

    static string[] FILE_EXTS = new string[]{
        ".tcross",
        ".json",
        ".txt",
        ".cpp",
        ".hpp",
        ".html",
        ".css",
        ".webmanifest",
        ".cs",
        ".c",
        ".h",
        ".xml",
        ".xaml",
        ".js",
        ".jsx",
        ".ts",
        ".tsx",
        ".gitignore",
        ".svg"
    };

    public void OpenFile(string path)
    {
        bool isValid = false;
        foreach (var item in FILE_EXTS)
        {
            if (Path.GetExtension(path).ToLower() == item)
                isValid = true;
        }
        if (!isValid) return;

        foreach (var item in TabItems)
        {
            if (item.Body is FileEditorViewModel model)
            {
                if (model.FilePath == path)
                {
                    SelectedTab = item;
                    return;
                }
            }
        }
        var tab = new TabItemViewModel
        {
            Header = Path.GetFileName(path),

        };
        tab.Body = new FileEditorViewModel(path,tab);
        AddTab(tab);
    }

    [ObservableProperty]
    private TabItemViewModel? _selectedTab = null;
    private void AddTab(TabItemViewModel item)
    {
        TabItems.Add(item);
        SelectedTab = item;

    }
    [RelayCommand]
    public async Task NewProjectAsync()
    {
        var res = await WeakReferenceMessenger.Default.Send(new NewProjectMessage());
        if (!string.IsNullOrWhiteSpace(res))
        {
            LoadProject(res);
        }
    }
    [RelayCommand]
    public async Task OpenProjectAsync()
    {
        var opts = new FolderPickerOpenOptions();
        opts.AllowMultiple = false;
        opts.Title = "Open Project";

        var window = await WeakReferenceMessenger.Default.Send(new GetWindowMessage());
        opts.SuggestedStartLocation = await window.StorageProvider.TryGetFolderFromPathAsync(CrossLangShell.Settings.ProjectDirectory) ?? null;
        var res = await window.StorageProvider.OpenFolderPickerAsync(opts);
        if (res.Count == 1)
        {
            var url = res[0].TryGetLocalPath();
            if (!string.IsNullOrWhiteSpace(url))
            {
                LoadProject(url);
            }
        }
    }

    [RelayCommand]
    private void OpenProjectInFileManager()
    {
        if (Directory.Exists(CurrentProject))
        {
            CrossLangShell.OpenFolderInFileManager(CurrentProject);
        }
    }
    [RelayCommand]
    private void OpenProjectInTerminal()
    {
        if (Directory.Exists(CurrentProject))
        {
            CrossLangShell.OpenTerminalInFolder(CurrentProject);
        }
    }
    [RelayCommand]
    private void BuildAndRun()
    {
        SaveAll();
        if (Directory.Exists(CurrentProject))
        {
            CrossLangShell.RunProjectInFolder(CurrentProject);
        }
    }
    [RelayCommand]
    private void Build()
    {
        SaveAll();
        if (Directory.Exists(CurrentProject))
        {
            CrossLangShell.BuildProjectInFolder(CurrentProject);
        }
    }

    [RelayCommand]
    private void Save()
    {
        SelectedTab?.Save();
    }
    [RelayCommand]
    private void SaveAll()
    {
        foreach (var tab in TabItems)
        {
            tab.Save();
        }
    }
}

public partial class NewTabViewModel : ViewModelBase
{
    private MainWindowViewModel mainWindowViewModel;
    private TabItemViewModel tab;

    public NewTabViewModel(MainWindowViewModel mainWindowViewModel, TabItemViewModel tab)
    {
        this.mainWindowViewModel = mainWindowViewModel;
        this.tab = tab;
    }

    [ObservableProperty]
    private string _filePath = "src/";

    [ObservableProperty]
    private decimal _progress = 0;

    [ObservableProperty]
    private string _url = "";

    [RelayCommand]
    private void CreateDirectory()
    {
        if (!string.IsNullOrWhiteSpace(FilePath))
        {
            Directory.CreateDirectory(Path.Combine(mainWindowViewModel.CurrentProject, FilePath));
            mainWindowViewModel.RefreshListing();
            mainWindowViewModel.TabItems.Remove(tab);
        }
    }
    [RelayCommand]
    private void CreateFile()
    {
        if (!string.IsNullOrWhiteSpace(FilePath))
        {
            var path = Path.Combine(mainWindowViewModel.CurrentProject, FilePath);
            File.WriteAllText(path, "");
            mainWindowViewModel.RefreshListing();
            mainWindowViewModel.TabItems.Remove(tab);
            mainWindowViewModel.OpenFile(path);
        }
    }

    [RelayCommand]
    private async Task DownloadFileAsync()
    {
        try
        {
            using var destStrm = File.Create(Path.Combine(mainWindowViewModel.CurrentProject, FilePath));
            var res = await mainWindowViewModel.Client.GetAsync(Url);
            long length = 0;
            long offset = 0;
            Progress = 0;
            if (res.IsSuccessStatusCode)
            {
                if (res.Content.Headers.ContentLength.HasValue)
                {
                    length = res.Content.Headers.ContentLength.Value;
                    byte[] array = new byte[1024];
                    int read = 0;
                    using var src = await res.Content.ReadAsStreamAsync();
                    do
                    {
                        read = await src.ReadAsync(array);
                        await destStrm.WriteAsync(array, 0, read);
                        offset += read;
                        if (length > 0)
                        {
                            Progress = (decimal)offset / (decimal)length;
                        }

                    } while (read != 0);
                }
                else
                {
                    await res.Content.CopyToAsync(destStrm);
                }
                Progress = 1;
                mainWindowViewModel.RefreshListing();
                mainWindowViewModel.TabItems.Remove(tab);
            }
            else
            {
                throw new Exception();
            }
        }
        catch (Exception)
        {
            File.Delete(FilePath);
            this.Url = $"FAILED: {this.Url}";
        }
    
    }
}