using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using MatterHackers.Agg;
using MatterHackers.Agg.UI;

namespace MatterHackers.MatterControl
{
    public class EditableNumberDisplay : FlowLayoutWidget
    {
        protected ClickWidget clickableValueContainer;
        protected Button setButton;
        protected MHNumberEdit numberInputField;
        protected TextWidget valueDisplay;

        public event EventHandler EditComplete;
        public event EventHandler EditEnabled;

        public EditableNumberDisplay(TextImageButtonFactory textImageButtonFactory, string startingValue, string largestPossibleValue)
            : base(Agg.UI.FlowDirection.LeftToRight)
        {
            this.Margin = new BorderDouble(3, 0);
            this.VAnchor |= VAnchor.ParentBottomTop;

            clickableValueContainer = new ClickWidget();
            clickableValueContainer.VAnchor = VAnchor.ParentBottomTop;
            clickableValueContainer.Cursor = Cursors.Hand;
            clickableValueContainer.BorderWidth = 1;
            clickableValueContainer.BorderColor = new RGBA_Bytes(255, 255, 255, 140);


            clickableValueContainer.MouseEnterBounds += (sender, e) =>
            {
                clickableValueContainer.BorderWidth = 2;
                clickableValueContainer.BorderColor = new RGBA_Bytes(255, 255, 255, 255);
            };

            clickableValueContainer.MouseLeaveBounds += (sender, e) =>
            {
                clickableValueContainer.BorderWidth = 1;
                clickableValueContainer.BorderColor = new RGBA_Bytes(255, 255, 255, 140);
            };

            valueDisplay = new TextWidget(largestPossibleValue, pointSize: 12);
            valueDisplay.VAnchor = VAnchor.ParentCenter;
            valueDisplay.HAnchor = HAnchor.ParentLeft;
            valueDisplay.TextColor = ActiveTheme.Instance.PrimaryTextColor;
            valueDisplay.Margin = new BorderDouble(6);

            clickableValueContainer.Click += new ClickWidget.ButtonEventHandler(editField_Click);

            clickableValueContainer.AddChild(valueDisplay);
            clickableValueContainer.SetBoundsToEncloseChildren();
            valueDisplay.Text = startingValue;

            numberInputField = new MHNumberEdit(0, pixelWidth: 40, allowDecimals: true);
            numberInputField.VAnchor = VAnchor.ParentCenter;
            numberInputField.Margin = new BorderDouble(left: 6);
            numberInputField.Visible = false;

            // This is a hack to make sure the control is tall enough. 
            // TODO: This hack needs a unit test and then pass and then remove this line.
            this.MinimumSize = new VectorMath.Vector2(0, numberInputField.Height);

            setButton = textImageButtonFactory.Generate("SET");
            setButton.VAnchor = VAnchor.ParentCenter;
            setButton.Margin = new BorderDouble(left: 6);
            setButton.Visible = false;

            numberInputField.ActuallNumberEdit.EnterPressed += new KeyEventHandler(ActuallNumberEdit_EnterPressed);

            numberInputField.KeyDown += (sender, e) =>
            {
                if (e.KeyCode == Keys.Escape)
                {
                    clickableValueContainer.Visible = true;
                    numberInputField.Visible = false;
                    setButton.Visible = false;
                }
            };

            setButton.Click += new ButtonBase.ButtonEventHandler(setButton_Click);

            this.AddChild(clickableValueContainer);
            this.AddChild(numberInputField);
            this.AddChild(setButton);
        }

        void editField_Click(object sender, MouseEventArgs mouseEvent)
        {
            clickableValueContainer.Visible = false;
            numberInputField.Visible = true;

            // This is trying to get all the numbers to the left of the decimal. We could do a better
            // job of finding the number. 6546431321654
            string displayString = valueDisplay.Text.Split('.')[0];
            if (displayString != null && displayString != "")
            {
                double displayStringAsValue;
                double.TryParse(displayString, out displayStringAsValue);
                numberInputField.ActuallNumberEdit.Value = displayStringAsValue;
            }

            numberInputField.ActuallNumberEdit.InternalNumberEdit.Focus();
            numberInputField.ActuallNumberEdit.InternalNumberEdit.SelectAll();
            setButton.Visible = true;
            OnEditEnabled();
        }

        public void OnEditEnabled()
        {
            if (EditEnabled != null)
            {
                EditEnabled(this, null);
            }
        }

        public void OnEditComplete()
        {
            if (EditComplete != null)
            {
                EditComplete(this, null);
            }
        }

        void setButton_Click(object sender, MouseEventArgs mouseEvent)
        {
            OnEditComplete();
        }

        void ActuallNumberEdit_EnterPressed(object sender, KeyEventArgs keyEvent)
        {
            OnEditComplete();
        }

        public void SetDisplayString(string displayString)
        {
            valueDisplay.Text = displayString;
            clickableValueContainer.Visible = true;
            numberInputField.Visible = false;
            setButton.Visible = false;
        }

        public double GetValue()
        {
            double targetTemp = Convert.ToDouble(numberInputField.Text);
            return targetTemp;
        }
    }
}