using System;
using System.Collections.ObjectModel;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Avalonia;
using Avalonia.Media;
using Avalonia.Platform.Storage;

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using CrossLangDevStudio.Messages;
using CrossLangDevStudio.Views;

namespace CrossLangDevStudio.ViewModels;

public class CRVMViewerViewModel : ViewModelBase
{
    public string FilePath { get; set; }
    public CRVMViewerViewModel(string path)
    {
        FilePath = path;
        var clf = new CrossLangFile();
        using (var strm = File.OpenRead(path))
        {

            clf.Load(strm);

        }


        foreach (var fn in clf.Functions)
        {
            string docs = $"/^{fn.NameParts[0]}^/";
            string name = string.Join(".", fn.NameParts.Skip(1));
            string args = string.Join(", ", clf.Chunks[(int)fn.ChunkId]);
            Functions.Add(new Function(docs, name, args));
        }
        foreach (var cls in clf.Classes)
        {
            string docs = $"/^{cls.Documentation}^/";
            ObservableCollection<Class.ClassEntry> entries = new ObservableCollection<Class.ClassEntry>();

            foreach (var item in cls.Entries)
            {
                string modifiers = $"\t{item.Modifier.ToString().ToLower()} ";
                if (item.IsFunction && item.IsAbstract)
                    modifiers += "abstract ";

                Class.ClassEntry ce = new Class.ClassEntry($"\t/^{item.Documentation}^/", item.Name, modifiers, item.IsFunction, item.IsFunction ? string.Join(", ", item.Arguments) : "");
                entries.Add(ce);
            }

            Classes.Add(new Class(docs, cls.Name, cls.Inherit, entries));
        }
    }

    public ObservableCollection<Function> Functions { get; set; } = new ObservableCollection<Function>();

    public ObservableCollection<Class> Classes { get; set; } = new ObservableCollection<Class>();

    public class Function(string docs, string name, string args) : ObservableObject
    {
        public string Name => name;

        public string Documentation => docs;

        public string Args => args;
    }

    public class Class(string docs, string name, string inherits, ObservableCollection<Class.ClassEntry> entries) : ObservableObject
    {
        public string Documentation => docs;

        public string Name => name;

        public string Inherits => inherits == "ClassObject" ? "" : inherits;

        public string InheritsColon => inherits == "ClassObject" ? "" : " : ";

        public ObservableCollection<ClassEntry> Entries => entries;

        public class ClassEntry(string docs,string name, string modifiers, bool isFunction, string args)
        {
            public string Documentation => docs;

            public string Name => name;
            public string Modifiers => modifiers;

            public IBrush NameColor => new SolidColorBrush(isFunction ? 0xFFDCDCAA : 0xFF9CDCFE);

            public IBrush LeftParenColor => new SolidColorBrush(isFunction ? 0xFFC586C0 : 0xFFCCCCCC);

            public string LeftParen => isFunction ? "(" : ";";

            public string RightParen => isFunction ? ")" : "";


            public string Args => args;
        }
    }
}