using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Diagnostics;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using SharpLib.Display;

using SharpLib.Ear;

using System.Reflection;

using Microsoft.VisualBasic.CompilerServices;

using SharpLib.Utils;

namespace SharpDisplayManager

{

    /// <summary>

    /// Object edit dialog form.

    /// </summary>

    public partial class FormEditObject<T> : Form where T : class

    {

        public T Object = null;

        public FormEditObject()

        {

            InitializeComponent();

        }

        /// <summary>

        /// 

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void FormEditAction_Load(object sender, EventArgs e)

        {

            // Populate registered object types

            IEnumerable < Type > types = Reflection.GetConcreteClassesDerivedFrom<T>();

            foreach (Type type in types)

            {

                ItemObjectType item = new ItemObjectType(type);

                comboBoxActionType.Items.Add(item);

            }

            if (Object == null)

            {

                // Creating new issue, select our first item

                comboBoxActionType.SelectedIndex = 0;

            }

            else

            {

                // Editing existing object

                // Look up our item in our combobox 

                foreach (ItemObjectType item in comboBoxActionType.Items)

                {

                    if (item.Type == Object.GetType())

                    {

                        comboBoxActionType.SelectedItem = item;

                    }

                }

            }            

        }

        private void buttonOk_Click(object sender, EventArgs e)

        {

            FetchPropertiesValue(Object);

        }

        private void FormEditAction_Validating(object sender, CancelEventArgs e)

        {

        }

        private void comboBoxActionType_SelectedIndexChanged(object sender, EventArgs e)

        {

            //Instantiate an action corresponding to our type

            Type actionType = ((ItemObjectType) comboBoxActionType.SelectedItem).Type;

            //Create another type of action only if needed

            if (Object == null || Object.GetType() != actionType)

            {

                Object = (T)Activator.CreateInstance(actionType);

            }

            //Create input fields

            UpdateTableLayoutPanel(Object);

        }

        /// <summary>

        /// Get properties values from our generated input fields

        /// </summary>

        private void FetchPropertiesValue(T aObject)

        {

            int ctrlIndex = 0;

            foreach (PropertyInfo pi in aObject.GetType().GetProperties())

            {

                AttributeObjectProperty[] attributes =

                    ((AttributeObjectProperty[]) pi.GetCustomAttributes(typeof(AttributeObjectProperty), true));

                if (attributes.Length != 1)

                {

                    continue;

                }

                AttributeObjectProperty attribute = attributes[0];

                if (!IsPropertyTypeSupported(pi))

                {

                    continue;

                }

                GetPropertyValueFromControl(iTableLayoutPanel.Controls[ctrlIndex+1], pi, aObject); //+1 otherwise we get the label

                ctrlIndex+=2; //Jump over the label too

            }

        }

        /// <summary>

        /// Extend this function to support reading new types of properties.

        /// </summary>

        /// <param name="aObject"></param>

        private void GetPropertyValueFromControl(Control aControl, PropertyInfo aInfo, T aObject)

        {

            if (aInfo.PropertyType == typeof(int))

            {

                NumericUpDown ctrl=(NumericUpDown)aControl;

                aInfo.SetValue(aObject,(int)ctrl.Value);

            }

            else if (aInfo.PropertyType.IsEnum)

            {

                // Instantiate our enum

                object enumValue= Activator.CreateInstance(aInfo.PropertyType);

                // Parse our enum from combo box

                enumValue = Enum.Parse(aInfo.PropertyType,((ComboBox)aControl).SelectedItem.ToString());

                //enumValue = ((ComboBox)aControl).SelectedValue;

                // Set enum value

                aInfo.SetValue(aObject, enumValue);

            }

            else if (aInfo.PropertyType == typeof(bool))

            {

                CheckBox ctrl = (CheckBox)aControl;

                aInfo.SetValue(aObject, ctrl.Checked);

            }

            else if (aInfo.PropertyType == typeof(string))

            {

                TextBox ctrl = (TextBox)aControl;

                aInfo.SetValue(aObject, ctrl.Text);

            }

            //TODO: add support for other types here

        }

        /// <summary>

        /// Create a control for the given property.

        /// </summary>

        /// <param name="aInfo"></param>

        /// <param name="aAttribute"></param>

        /// <param name="aObject"></param>

        /// <returns></returns>

        private Control CreateControlForProperty(PropertyInfo aInfo, AttributeObjectProperty aAttribute, T aObject)

        {

            if (aInfo.PropertyType == typeof(int))

            {

                //Integer properties are using numeric editor

                NumericUpDown ctrl = new NumericUpDown();

                ctrl.AutoSize = true;

                ctrl.Minimum = Int32.Parse(aAttribute.Minimum);

                ctrl.Maximum = Int32.Parse(aAttribute.Maximum);

                ctrl.Increment = Int32.Parse(aAttribute.Increment);

                ctrl.Value = (int)aInfo.GetValue(aObject);

                return ctrl;

            }

            else if (aInfo.PropertyType.IsEnum)

            {

                //Enum properties are using combo box

                ComboBox ctrl = new ComboBox();

                ctrl.AutoSize = true;                

                ctrl.Sorted = true;                

                ctrl.DropDownStyle = ComboBoxStyle.DropDownList;

                //Data source is fine but it gives us duplicate entries for duplicated enum values

                //ctrl.DataSource = Enum.GetValues(aInfo.PropertyType);

                //Therefore we need to explicitly create our items

                Size cbSize = new Size(0,0);

                foreach (string name in aInfo.PropertyType.GetEnumNames())

                {

                    ctrl.Items.Add(name.ToString());

                    Graphics g = this.CreateGraphics();

                    //Since combobox autosize would not work we need to get measure text ourselves

                    SizeF size=g.MeasureString(name.ToString(), ctrl.Font);

                    cbSize.Width = Math.Max(cbSize.Width,(int)size.Width);

                    cbSize.Height = Math.Max(cbSize.Height, (int)size.Height);

                }

                //Make sure our combobox is large enough

                ctrl.MinimumSize = cbSize;

                // Instantiate our enum

                object enumValue = Activator.CreateInstance(aInfo.PropertyType);

                enumValue = aInfo.GetValue(aObject);

                //Set the current item

                ctrl.SelectedItem = enumValue.ToString();

                return ctrl;

            }

            else if (aInfo.PropertyType == typeof(bool))

            {

                CheckBox ctrl = new CheckBox();

                ctrl.AutoSize = true;

                ctrl.Text = aAttribute.Description;

                ctrl.Checked = (bool)aInfo.GetValue(aObject);                

                return ctrl;

            }

            else if (aInfo.PropertyType == typeof(string))

            {

                TextBox ctrl = new TextBox();

                ctrl.AutoSize = true;

                ctrl.Text = (string)aInfo.GetValue(aObject);

                return ctrl;

            }

            //TODO: add support for other control type here

            return null;

        }

        /// <summary>

        /// Don't forget to extend that one and adding types

        /// </summary>

        /// <returns></returns>

        private bool IsPropertyTypeSupported(PropertyInfo aInfo)

        {

            if (aInfo.PropertyType == typeof(int))

            {

                return true;

            }

            else if (aInfo.PropertyType.IsEnum)

            {

                return true;

            }

            else if (aInfo.PropertyType == typeof(bool))

            {

                return true;

            }

            else if (aInfo.PropertyType == typeof(string))

            {

                return true;

            }

            //TODO: add support for other type here

            return false;

        }

        /// <summary>

        /// Update our table layout.

        /// Will instantiated every field control as defined by our action.

        /// Fields must be specified by rows from the left.

        /// </summary>

        /// <param name="aLayout"></param>

        private void UpdateTableLayoutPanel(T aObject)

        {

            toolTip.RemoveAll();

            //Debug.Print("UpdateTableLayoutPanel")

            //First clean our current panel

            iTableLayoutPanel.Controls.Clear();

            iTableLayoutPanel.RowStyles.Clear();

            iTableLayoutPanel.ColumnStyles.Clear();

            iTableLayoutPanel.RowCount = 0;

            //We always want two columns: one for label and one for the field

            iTableLayoutPanel.ColumnCount = 2;

            iTableLayoutPanel.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));

            iTableLayoutPanel.ColumnStyles.Add(new ColumnStyle(SizeType.AutoSize));

            if (aObject == null)

            {

                //Just drop it

                return;

            }

            //IEnumerable<PropertyInfo> properties = aObject.GetType().GetProperties().Where(

            //    prop => Attribute.IsDefined(prop, typeof(AttributeObjectProperty)));

            foreach (PropertyInfo pi in aObject.GetType().GetProperties())

            {

                AttributeObjectProperty[] attributes = ((AttributeObjectProperty[])pi.GetCustomAttributes(typeof(AttributeObjectProperty), true));

                if (attributes.Length != 1)

                {

                    continue;

                }

                AttributeObjectProperty attribute = attributes[0];

                //Before anything we need to check if that kind of property is supported by our UI

                //Create the editor

                Control ctrl = CreateControlForProperty(pi, attribute, aObject);

                if (ctrl == null)

                {

                    //Property type not supported

                    continue;

                }

                //Add a new row

                iTableLayoutPanel.RowCount++;

                iTableLayoutPanel.RowStyles.Add(new RowStyle(SizeType.AutoSize));

                //Create the label

                Label label = new Label();

                label.AutoSize = true;

                label.Dock = DockStyle.Fill;

                label.TextAlign = ContentAlignment.MiddleCenter;

                label.Text = attribute.Name;

                toolTip.SetToolTip(label, attribute.Description);

                iTableLayoutPanel.Controls.Add(label, 0, iTableLayoutPanel.RowCount-1);

                //Add our editor to our form

                iTableLayoutPanel.Controls.Add(ctrl, 1, iTableLayoutPanel.RowCount - 1);

                //Add tooltip to editor too

                toolTip.SetToolTip(ctrl, attribute.Description);

            }        

        }

        private void buttonTest_Click(object sender, EventArgs e)

        {

            FetchPropertiesValue(Object);

            //If our object has a test method with no parameters just run it then

            MethodInfo info = Object.GetType().GetMethod("Test");

            if ( info != null && info.GetParameters().Length==0)

            {

                info.Invoke(Object,null);

            }

        }

    }

}