using PRS.Shared;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace PRSDesktop
{
    public delegate void HeaderChangedEvent(DashboardHeader header);

    public class DashboardHeader
    {
        private readonly List<FrameworkElement> LeftElements = new();
        private readonly List<FrameworkElement> RightElements = new();
        private bool Updating = false;

        public event HeaderChangedEvent? HeaderChanged;

        public DashboardHeader BeginUpdate()
        {
            Updating = true;
            return this;
        }
        public DashboardHeader EndUpdate()
        {
            Updating = false;
            Update();
            return this;
        }
        private void Update()
        {
            if (!Updating)
            {
                HeaderChanged?.Invoke(this);
            }
        }

        public DashboardHeader Clear()
        {
            LeftElements.Clear();
            RightElements.Clear();
            Update();
            return this;
        }
        public DashboardHeader Add(FrameworkElement element)
        {
            LeftElements.Add(element);
            Update();
            return this;
        }
        public DashboardHeader AddRight(FrameworkElement element)
        {
            RightElements.Add(element);
            Update();
            return this;
        }

        public IEnumerable<FrameworkElement> GetLeftElements() => LeftElements;
        public IEnumerable<FrameworkElement> GetRightElements() => RightElements;
    }

    public interface IHeaderDashboard
    {
        DashboardHeader Header { get; }
    }
}