using System;
using System.Drawing;
using Dashboard.Drawing;
using Dashboard.Events;
using Dashboard.Pal;
using Dashboard.Windowing;

namespace Dashboard.Controls
{
    public class Form : Container, IForm
    {
        private string? _title = "Untitled Form";
        public IWindow Window { get; }

        public Image? WindowIcon { get; set; }

        public string? Title
        {
            get => _title;
            set
            {
                _title = value;
                Window.Title = _title ?? "";
            }
        }
        public Brush Background { get; set; } = new SolidColorBrush(Color.SlateGray);
        public Control? FocusedControl { get; private set; } = null;

        public override Box2d ClientArea
        {
            get => new Box2d(0, 0, Window.ClientSize.Width, Window.ClientSize.Height);
            set { }
        }

        public event EventHandler<WindowCloseEvent>? Closing;

        public Form(IWindow window)
        {
            Window = window;
            window.Form = this;

            Window.Title = _title;
        }

        public void Focus(Control control)
        {
            if (FocusedControl != null)
                InvokeFocusLost(this, FocusedControl);

            FocusedControl = control;
            InvokeFocusGained(this, control);
        }

        public override void OnPaint(DeviceContext dc)
        {
            dc.Begin();

            var dcb = dc.ExtensionRequire<IDeviceContextBase>();
            dcb.ResetClip();
            dcb.ResetScissor();
            dcb.ResetTransforms();

            dcb.ClearDepth();

            if (Background is SolidColorBrush solidColorBrush)
                dcb.ClearColor(solidColorBrush.Color);

            foreach (Control child in this)
                child.SendEvent(this, new PaintEventArgs(dc));

            base.OnPaint(dc);

            dc.End();
        }

        protected virtual void OnClosing(WindowCloseEvent ea)
        {
            Closing?.Invoke(this, ea);

            if (ea.Cancel)
                return;

            Dispose();
            Window.Dispose();
        }

        protected override void OnEventRaised(object? sender, EventArgs args)
        {
            base.OnEventRaised(sender, args);

            switch (args)
            {
                case WindowCloseEvent close:
                    OnClosing(close);
                    break;
            }
        }
    }
}