using System.Collections.ObjectModel;
using System.Collections.Specialized;
using Adw;
using Gtk;
using Logic;

namespace Keychain.ViewModels;

public class PasswordList : ObservableCollection<PasswordViewModel>
{
    private readonly IPasswordService _passwordService;
    private readonly PreferencesGroup list;
    private Dictionary<PasswordViewModel, ActionRow> itemToRowMap = new();

    public PasswordList(PreferencesGroup list, IPasswordService passwordService)
        : base()
    {
        this.list = list;
        CollectionChanged += OnCollectionChanged;
        _passwordService = passwordService;

        //test
        Add(new PasswordViewModel("Sample Password"));
    }


    private void OnCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
    {
        switch (e.Action)
        {
            case NotifyCollectionChangedAction.Add:
                foreach (PasswordViewModel item in e.NewItems)
                {
                    var row = CreateActionRow(item);
                    itemToRowMap[item] = row;
                    list.Add(row);

                    // Subscribe to property changes for reactive updates  
                    item.PropertyChanged += (sender, args) => UpdateRowFromItem(item, ref row);
                }
                break;

            case NotifyCollectionChangedAction.Remove:
                foreach (PasswordViewModel item in e.OldItems)
                {
                    if (itemToRowMap.TryGetValue(item, out var row))
                    {
                        list.Remove(row);
                        itemToRowMap.Remove(item);
                    }
                }
                break;

            case NotifyCollectionChangedAction.Reset:
                foreach (var row in itemToRowMap.Values)
                {
                    list.Remove(row);
                }
                itemToRowMap.Clear();
                break;
        }
    }

    private ActionRow CreateActionRow(PasswordViewModel item)
    {
        var row = new ActionRow();
        UpdateRowFromItem(item, ref row);
        return row;
    }

    private void UpdateRowFromItem(PasswordViewModel item, ref ActionRow row)
    {
        row.SetTitle(item.Name);

        // Inactive button for intuitive UI
        var go = new Button();
        go.Sensitive = false;
        go.AddCssClass("flat");
        go.SetValign(Align.Center);
        go.IconName = "go-next-symbolic";
        row.AddSuffix(go);
    }  
}