//
// (C) Copyright 2003-2019 by Autodesk, Inc.
//
// Permission to use, copy, modify, and distribute this software in
// object code form for any purpose and without fee is hereby granted,
// provided that the above copyright notice appears in all copies and
// that both that copyright notice and the limited warranty and
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// documentation.
//
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// AUTODESK SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF
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// DOES NOT WARRANT THAT THE OPERATION OF THE PROGRAM WILL BE
// UNINTERRUPTED OR ERROR FREE.
//
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// restrictions set forth in FAR 52.227-19 (Commercial Computer
// Software - Restricted Rights) and DFAR 252.227-7013(c)(1)(ii)
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//
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Autodesk.Revit;
using System.Collections;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using System.Drawing.Drawing2D;

namespace Revit.SDK.Samples.SlabShapeEditing.CS
{
    /// <summary>
    /// window form contains one picture box to show the 
    /// profile of slab geometry. user can add vertex and crease.
    /// User can edit slab shape via vertex and crease too.
    /// </summary>
    public partial class SlabShapeEditingForm : System.Windows.Forms.Form
    {
        enum EditorState { AddVertex, AddCrease, Select, Rotate, Null };

        ExternalCommandData m_commandData; //object which contains reference of Revit Application
        SlabProfile m_slabProfile; //store geometry info of selected slab
        PointF m_mouseRightDownLocation; //where mouse right button down
        LineTool m_lineTool; //tool use to draw crease
        LineTool m_pointTool; //tool use to draw vertex
        ArrayList m_graphicsPaths; //store all the GraphicsPath objects of crease and vertex.
        int m_selectIndex; //index of crease and vertex which mouse hovering on.
        int m_clickedIndex; //index of crease and vertex which mouse clicked.
        ArrayList m_createdVertices; // new created vertices
        ArrayList m_createCreases; // new created creases
        private SlabShapeEditor m_slabShapeEditor; //object use to edit slab shape
        SlabShapeCrease m_selectedCrease; //selected crease, mouse clicked on
        SlabShapeVertex m_selectedVertex; //selected vertex, mouse clicked on
        EditorState editorState; //state of user's operation
        Pen m_toolPen; //pen use to draw new created vertex and crease
        Pen m_selectPen; // pen use to draw vertex and crease which been selected
        Pen m_profilePen; // pen use to draw slab's profile
        const string justNumber = "Please input numbers in textbox!"; //error message
        const string selectFirst = "Please select a Vertex (or Crease) first!"; //error message

        /// <summary>
        /// constructor
        /// </summary>
        /// <param name="commandData">selected floor (or slab)</param>
        /// <param name="commandData">contains reference of Revit Application</param>
        public SlabShapeEditingForm(Floor floor, ExternalCommandData commandData)
        {
            InitializeComponent();
            m_commandData = commandData;
            m_slabProfile = new SlabProfile(floor, commandData);
            m_slabShapeEditor = floor.GetSlabShapeEditor();
            m_lineTool = new LineTool();
            m_pointTool = new LineTool();
            editorState = EditorState.AddVertex;
            m_graphicsPaths = new ArrayList();
            m_createdVertices = new ArrayList();
            m_createCreases = new ArrayList();
            m_selectIndex = -1;
            m_clickedIndex = -1;
            m_toolPen = new Pen(System.Drawing.Color.Blue, 2);
            m_selectPen = new Pen(System.Drawing.Color.Red, 2);
            m_profilePen = new Pen(System.Drawing.Color.Black, (float)(0.5));
        }

        /// <summary>
        /// represents the geometry info for slab
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void SlabShapePictureBox_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;

            m_slabProfile.Draw2D(e.Graphics, m_profilePen);

            if (EditorState.Rotate != editorState)
            {
                m_lineTool.Draw2D(e.Graphics, m_toolPen);
                m_pointTool.DrawRectangle(e.Graphics, m_toolPen);
                //draw selected beam (line) by red pen
                DrawSelectedLineRed(e.Graphics, m_selectPen);
            }
        }

        /// <summary>
        /// Draw selected crease or vertex red
        /// </summary>
        /// <param name="graphics">Form graphics object,</param>
        /// <param name="pen">Pen which used to draw lines</param>
        private void DrawSelectedLineRed(Graphics graphics, Pen pen)
        {
            if (-1 != m_selectIndex)
            {
                GraphicsPath selectedPath = (GraphicsPath)m_graphicsPaths[m_selectIndex];
                PointF pointF0 = (PointF)selectedPath.PathPoints.GetValue(0);
                PointF pointF1 = (PointF)selectedPath.PathPoints.GetValue(1);
                if (m_selectIndex < m_createCreases.Count)
                { graphics.DrawLine(pen, pointF0, pointF1); }
                else { graphics.DrawRectangle(pen, pointF0.X - 2, pointF0.Y - 2, 4, 4); }
            }
            if (-1 != m_clickedIndex)
            {
                GraphicsPath clickedPath = (GraphicsPath)m_graphicsPaths[m_clickedIndex];
                PointF pointF0 = (PointF)clickedPath.PathPoints.GetValue(0);
                PointF pointF1 = (PointF)clickedPath.PathPoints.GetValue(1);
                if (m_clickedIndex < m_createCreases.Count)
                { graphics.DrawLine(pen, pointF0, pointF1); }
                else { graphics.DrawRectangle(pen, pointF0.X - 2, pointF0.Y - 2, 4, 4); }
            }
        }

        /// <summary>
        /// rotate slab and get selected vertex or crease
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void SlabShapePictureBox_MouseMove(object sender, MouseEventArgs e)
        {
            PointF pointF = new PointF(e.X, e.Y);
            if (EditorState.AddCrease == editorState && 1 == m_lineTool.Points.Count % 2)
            { m_lineTool.MovePoint = pointF; }
            else { m_lineTool.MovePoint = PointF.Empty; }

            if (MouseButtons.Right == e.Button)
            {
                double moveX = e.Location.X - m_mouseRightDownLocation.X;
                double moveY = m_mouseRightDownLocation.Y - e.Location.Y;
                m_slabProfile.RotateFloor(moveY / 500, moveX / 500);
                m_mouseRightDownLocation = e.Location;
            }
            else if (EditorState.Select == editorState)
            {
                for (int i = 0; i < m_graphicsPaths.Count; i++)
                {
                    GraphicsPath path = (GraphicsPath)m_graphicsPaths[i];
                    if (path.IsOutlineVisible(pointF, m_toolPen))
                    { m_selectIndex = i; break; }
                    m_selectIndex = -1;
                }
            }
            this.SlabShapePictureBox.Refresh();
        }

        /// <summary>
        /// get location where right button click down.
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void SlabShapePictureBox_MouseDown(object sender, MouseEventArgs e)
        {
            if (MouseButtons.Right == e.Button)
            {
                m_mouseRightDownLocation = e.Location;
                editorState = EditorState.Rotate;
                m_clickedIndex = m_selectIndex = -1;
            }
        }

        /// <summary>
        /// add vertex and crease, select new created vertex and crease
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void SlabShapePictureBox_MouseClick(object sender, MouseEventArgs e)
        {
            if (EditorState.AddCrease == editorState)
            {
                if (!m_slabProfile.CanCreateVertex(new PointF(e.X, e.Y))) { return; }
                m_lineTool.Points.Add(new PointF(e.X, e.Y));
                int lineSize = m_lineTool.Points.Count;
                if (0 == m_lineTool.Points.Count % 2)
                {
                    m_createCreases.Add(
                        m_slabProfile.AddCrease((PointF)m_lineTool.Points[lineSize - 2],
                        (PointF)m_lineTool.Points[lineSize - 1]));
                }
                CreateGraphicsPath(); //create graphic path for all the vertex and crease
            }
            else if (EditorState.AddVertex == editorState)
            {
                SlabShapeVertex vertex = m_slabProfile.AddVertex(new PointF(e.X, e.Y));
                if (null == vertex) { return; }
                m_pointTool.Points.Add(new PointF(e.X, e.Y));
                //draw point as a short line, so add two points here
                m_pointTool.Points.Add(new PointF((float)(e.X + 2), (float)(e.Y + 2)));
                m_createdVertices.Add(vertex);
                CreateGraphicsPath(); //create graphic path for all the vertex and crease
            }
            else if (EditorState.Select == editorState)
            {
                if (m_selectIndex >= 0)
                {
                    m_clickedIndex = m_selectIndex;
                    if (m_selectIndex <= m_createCreases.Count - 1)
                    {
                        m_selectedCrease = (SlabShapeCrease)(m_createCreases[m_selectIndex]);
                        m_selectedVertex = null;
                    }
                    else
                    {
                        //put all path (crease and vertex) in one arrayList, so reduce creases.count
                        int index = m_selectIndex - m_createCreases.Count;
                        m_selectedVertex = (SlabShapeVertex)(m_createdVertices[index]);
                        m_selectedCrease = null;
                    }
                }
                else { m_selectedVertex = null; m_selectedCrease = null; m_clickedIndex = -1; }
            }
            this.SlabShapePictureBox.Refresh();
        }

        /// <summary>
        /// get ready to add vertex
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void PointButton_Click(object sender, EventArgs e)
        {
            editorState = EditorState.AddVertex;
            m_slabProfile.ClearRotateMatrix();
            this.SlabShapePictureBox.Cursor = Cursors.Cross;
        }

        /// <summary>
        /// get ready to add crease
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void LineButton_Click(object sender, EventArgs e)
        {
            editorState = EditorState.AddCrease;
            m_slabProfile.ClearRotateMatrix();
            this.SlabShapePictureBox.Cursor = Cursors.Cross;
        }

        /// <summary>
        /// get ready to move vertex and crease
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void MoveButton_Click(object sender, EventArgs e)
        {
            editorState = EditorState.Select;
            m_slabProfile.ClearRotateMatrix();
            this.SlabShapePictureBox.Cursor = Cursors.Arrow;
        }

        /// <summary>
        /// Move vertex and crease, then update profile of slab
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void UpdateButton_Click(object sender, EventArgs e)
        {
            if (-1 == m_clickedIndex) { Autodesk.Revit.UI.TaskDialog.Show("Revit", selectFirst); return; }

            double moveDistance = 0;
            try { moveDistance = Convert.ToDouble(this.DistanceTextBox.Text); }
            catch (Exception) { Autodesk.Revit.UI.TaskDialog.Show("Revit", justNumber); return; }

            using (Transaction transaction = new Transaction(
               m_commandData.Application.ActiveUIDocument.Document, "Update"))
            {
                transaction.Start();
                if (null != m_selectedCrease)
                { m_slabShapeEditor.ModifySubElement(m_selectedCrease, moveDistance); }
                else if (null != m_selectedVertex)
                { m_slabShapeEditor.ModifySubElement(m_selectedVertex, moveDistance); }
                transaction.Commit();
            }
            //re-calculate geometry info
            m_slabProfile.GetSlabProfileInfo();
            this.SlabShapePictureBox.Refresh();
        }

        /// <summary>
        /// Reset slab shape
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void ResetButton_Click(object sender, EventArgs e)
        {
            m_slabProfile.ResetSlabShape();
            m_lineTool.Points.Clear();
            m_pointTool.Points.Clear();
        }

        /// <summary>
        ///  Create Graphics Path for each vertex and crease
        /// </summary>
        public void CreateGraphicsPath()
        {
            m_graphicsPaths.Clear();
            //create path for all the lines draw by user
            for (int i = 0; i < m_lineTool.Points.Count - 1; i += 2)
            {
                GraphicsPath path = new GraphicsPath();
                path.AddLine((PointF)m_lineTool.Points[i], (PointF)m_lineTool.Points[i + 1]);
                m_graphicsPaths.Add(path);
            }
            for (int i = 0; i < m_pointTool.Points.Count - 1; i += 2)
            {
                GraphicsPath path = new GraphicsPath();
                path.AddLine((PointF)m_pointTool.Points[i], (PointF)m_pointTool.Points[i + 1]);
                m_graphicsPaths.Add(path);
            }
        }

        /// <summary>
        /// set tool tip for MoveButton
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void MoveButton_MouseHover(object sender, EventArgs e)
        {
            this.toolTip.SetToolTip(this.MoveButton, "Select Vertex or Crease");
        }

        /// <summary>
        /// set tool tip for PointButton
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void PointButton_MouseHover(object sender, EventArgs e)
        {
            this.toolTip.SetToolTip(this.PointButton, "Add Vertex");
        }

        /// <summary>
        /// set tool tip for LineButton
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void LineButton_MouseHover(object sender, EventArgs e)
        {
            this.toolTip.SetToolTip(this.LineButton, "Add Crease");
        }

        /// <summary>
        /// change cursor
        /// </summary>
        /// <param name="sender">object who sent this event</param>
        /// <param name="e">event args</param>
        private void SlabShapePictureBox_MouseHover(object sender, EventArgs e)
        {
            switch (editorState)
            {
                case EditorState.AddVertex:
                    this.SlabShapePictureBox.Cursor = Cursors.Cross; break;
                case EditorState.AddCrease:
                    this.SlabShapePictureBox.Cursor = Cursors.Cross; break;
                case EditorState.Select:
                    this.SlabShapePictureBox.Cursor = Cursors.Arrow; break;
                default:
                    this.SlabShapePictureBox.Cursor = Cursors.Default; break;
            }
        }
    }
}