using PaintDotNet.Annotation.Enum;
using PaintDotNet.Base.SettingModel;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Globalization;
using System.Linq;
using System.Runtime.Serialization;
using System.Security.Permissions;

namespace PaintDotNet.Annotation
{
    using DrawList = List<DrawObject>;


    public interface DocumentDirtyObserver
    {
        void IsDirty(GraphicsList gList);
    }

    /// <summary>
    /// 绘制对象的数组
    /// 每个surface保持一个自己的list
    /// </summary>
    [Serializable]
    public class GraphicsList : ISerializable
    {
        public DrawList graphicsList;
        private List<DocumentDirtyObserver> observers;
        private bool dirty;
        private const string entryCount = "Count";
        private const string entryType = "Type";

        public GraphicsList()
        {
            this.graphicsList = new DrawList();
            this.observers = new List<DocumentDirtyObserver>();
            this.dirty = false;
        }

        public GraphicsList(ISurfaceBox surfaceBox)
        {
            this.graphicsList = new DrawList();
            this.observers = new List<DocumentDirtyObserver>();
            this.dirty = false;
        }

        #region Serialization Support

        /// <summary>
        /// Save object to serialization stream
        /// </summary>
        /// <param name="info"></param>
        /// <param name="context"></param>
        [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]
        public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
        {
            info.AddValue(entryCount, graphicsList.Count);

            int i = 0;

            foreach (DrawObject o in graphicsList)
            {
                info.AddValue(
                    String.Format(CultureInfo.InvariantCulture,
                        "{0}{1}",
                        entryType, i),
                    o.GetType().FullName);

                o.SaveToStream(info, i);

                i++;
            }
        }
        #endregion

        #region Other functions
        protected void NotifyDirty()
        {
            if (this.dirty)
            {
                foreach (DocumentDirtyObserver obs in this.observers)
                {
                    obs.IsDirty(this);
                }
            }
        }

        public void Draw(Graphics g)
        {
            int n = graphicsList.Count;
            DrawObject o;
            int n3 = 0;
            // Enumerate list in reverse order to get first
            // object on the top of Z-order.
            for (int i = n - 1; i >= 0; i--)
            {
                o = graphicsList[i];
                //如果是视场，则只绘制一次
                if (o.objectType == DrawClass.View)
                {
                    if (n3 == 0)
                    {
                        o.Draw(g);
                        n3++;
                    }
                }
                else
                {
                    o.Draw(g);
                }

                if (o.Selected == true)
                {
                    o.DrawTracker(g);
                }
            }
        }

        /// <summary>
        /// Dump (for debugging)
        /// </summary>
        public void Dump()
        {
            Trace.WriteLine("");

            foreach (DrawObject o in graphicsList)
            {
                o.Dump();
            }
        }

        /// <summary>
        /// Clear all objects in the list
        /// </summary>
        /// <returns>
        /// true if at least one object is deleted
        /// </returns>
        public bool Clear()
        {
            bool result = (graphicsList.Count > 0);
            graphicsList.Clear();
            return result;
        }

        /// <summary>
        /// Tells if the document is dirty.
        /// </summary>
        public bool Dirty
        {
            get
            {
                return this.dirty;
            }
            set
            {
                this.dirty = value;
                if (this.dirty)
                {
                    NotifyDirty();
                }
            }
        }

        /// <summary>
        /// Count and this [nIndex] allow to read all graphics objects
        /// from GraphicsList in the loop.
        /// </summary>
        public int Count
        {
            get
            {
                return graphicsList.Count;
            }
        }

        public DrawObject this[int index]
        {
            get
            {
                if (index < 0 || index >= graphicsList.Count)
                    return null;

                return graphicsList[index];
            }
        }

        public Size GetSize()
        {
            Size size = new Size(0, 0);

            foreach (DrawObject obj in graphicsList)
            {
                RectangleF objRect = obj.Rectangle;
                size.Width = (int)Math.Max(size.Width, objRect.X + objRect.Width);
                size.Height = (int)Math.Max(size.Height, objRect.Y + objRect.Height);
            }
            size.Width += 20;
            size.Height += 20;

            return size;
        }


        #region Selection 
        /// <summary>
        /// SelectedCount and GetSelectedObject allow to read
        /// selected objects in the loop
        /// </summary>
        public int SelectionCount
        {
            get
            {
                int n = 0;

                foreach (DrawObject o in Selection)
                {
                    n++;
                }

                return n;
            }
        }


        public IEnumerable<DrawObject> Selection
        {
            get
            {
                foreach (DrawObject o in graphicsList)
                {
                    if (o.Selected)
                    {
                        yield return o;
                    }
                }
            }
        }

        DrawObject LastDrawObject = null;
        /// <summary>
        /// 用于修改视场，获得选中的视场
        /// 因为修改视场判断了只能修改一个，
        /// 所以找到一个被选中就返回
        /// </summary>
        public DrawObject SelectDrawObject
        {
            get
            {
                if (graphicsList.Count((o) => o.Selected) == 1)
                    return graphicsList.Find((o) => o.Selected);
                else
                    return null;
            }
        }

        public event EventHandler SelectChanged;

        public virtual void OnSelectChanged()
        {
            if (LastDrawObject == SelectDrawObject) return;
            LastDrawObject = SelectDrawObject;
            SelectChanged?.Invoke(this, EventArgs.Empty);
        }

        public void SelectInRectangle(Rectangle rectangle)
        {
            UnselectAll();

            foreach (DrawObject o in graphicsList)
            {
                if (o.IntersectsWith(rectangle) && !o.isLocked)
                    o.Selected = true;
            }
        }

        public void UnselectAll()
        {
            foreach (DrawObject o in graphicsList)
            {
                o.Selected = false;
            }
        }

        public void SelectAll()
        {
            foreach (DrawObject o in graphicsList)
            {
                if (!o.isLocked)
                {
                    o.Selected = true;
                }
            }
        }
        #endregion

        #region  增删改
        public void Add(DrawObject obj)
        {
            obj.SelectedChanged += OnSelectChanged;
            graphicsList.Insert(0, obj);
            this.Dirty = true;
        }

        /// <summary>
        /// Insert object to specified place.
        /// Used for Undo.
        /// </summary>
        public void Insert(int index, DrawObject obj)
        {
            if (index >= 0 && index < graphicsList.Count)
            {
                graphicsList.Insert(index, obj);
            }
        }

        /// <summary>
        /// Replace object in specified place.
        /// Used for Undo.
        /// </summary>
        public void Replace(int index, DrawObject obj)
        {
            if (index >= 0 && index < graphicsList.Count)
            {
                graphicsList.RemoveAt(index);
                graphicsList.Insert(index, obj);
            }
        }

        /// <summary>
        /// Remove object by index.
        /// Used for Undo.
        /// </summary>
        public void RemoveAt(int index)
        {
            graphicsList.RemoveAt(index);
        }

        public void RemoveObj(DrawObject obj)
        {
            graphicsList.Remove(obj);
        }


        public void RemoveByIds(List<int> ids)
        {
            for (int i = 0; i < ids.Count; i++)
            {
                graphicsList.RemoveAll(u => u.ID == ids[i]);
            }
        }

        /// <summary>
        /// Delete last added object from the list
        /// (used for Undo operation).
        /// </summary>
        public void DeleteLastAddedObject()
        {
            if (graphicsList.Count > 0)
            {
                graphicsList.RemoveAt(0);
            }
        }

        /// <summary>
        /// 删除选中，目前应用在视场
        /// </summary>
        /// <returns>
        /// true if at least one object is deleted
        /// </returns>
        public bool DeleteSelection(DrawClass type)
        {
            bool result = false;

            int n = graphicsList.Count;

            for (int i = n - 1; i >= 0; i--)
            {
                if (((DrawObject)graphicsList[i]).Selected)
                {
                    //这里用来区分选择的是标注、测量、还是视场
                    //比如选择的是测量，用删除视场的菜单就不应该生效
                    if (type == ((DrawObject)graphicsList[i]).objectType)
                    {
                        graphicsList.RemoveAt(i);
                        result = true;
                    }
                }
            }

            return result;
        }
        #endregion

        /// <summary>
        /// 删除某种类型的工具
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public bool DeleteDrawClass(DrawClass type)
        {
            bool result = false;
            int n = graphicsList.Count;
            for (int i = n - 1; i >= 0; i--)
            {
                if (type == ((DrawObject)graphicsList[i]).objectType)
                {
                    graphicsList.RemoveAt(i);
                    result = true;
                }
            }
            return result;
        }

        public bool DeleteDrawClass(DrawToolType type)
        {
            bool result = false;
            int n = graphicsList.Count;
            for (int i = n - 1; i >= 0; i--)
            {
                if (type == ((DrawObject)graphicsList[i]).drawToolType)
                {
                    graphicsList.RemoveAt(i);
                    result = true;
                }
            }
            return result;
        }

        /// <summary>
        /// 清空视场
        /// </summary>
        /// <returns></returns>
        public void DeleteAllView()
        {
            int n = graphicsList.Count;
            for (int i = n - 1; i >= 0; i--)
            {
                if (DrawClass.View == ((DrawObject)graphicsList[i]).objectType)
                {
                    graphicsList.RemoveAt(i);
                }
            }
        }

        /// <summary>
        /// 向上移动
        /// </summary>
        /// <returns></returns>
        public bool MoveSelectionToMoveUp()
        {
            int n = graphicsList.Count;
            for (int i = 0; i < n; i++)
            {
                if ((graphicsList[i]).Selected)
                {
                    if (i > 0)
                    {
                        graphicsList.Insert(i - 1, graphicsList[i]);
                        graphicsList.RemoveAt(i + 1);
                    }
                }
            }
            return true;
        }

        /// <summary>
        /// 向下移动
        /// </summary>
        /// <returns></returns>
        public bool MoveSelectionToMoveDown()
        {
            int n = graphicsList.Count;
            for (int i = 0; i < n; i++)
            {
                if ((graphicsList[i]).Selected)
                {
                    if (i < n - 1)
                    {
                        graphicsList.Insert(i + 2, graphicsList[i]);
                        graphicsList.RemoveAt(i);
                        break;
                    }
                }
            }
            return true;
        }

        /// <summary>
        /// 移动到最上
        /// Move selected items to front (beginning of the list)
        /// </summary>
        /// <returns>
        /// true if at least one object is moved
        /// </returns>
        public bool MoveSelectionToFront()
        {
            int n;
            int i;
            DrawList tempList;

            tempList = new DrawList();
            n = graphicsList.Count;

            // Read source list in reverse order, add every selected item
            // to temporary list and remove it from source list
            for (i = n - 1; i >= 0; i--)
            {
                if ((graphicsList[i]).Selected)
                {
                    tempList.Add(graphicsList[i]);
                    graphicsList.RemoveAt(i);
                }
            }

            // Read temporary list in direct order and insert every item
            // to the beginning of the source list
            n = tempList.Count;

            for (i = 0; i < n; i++)
            {
                graphicsList.Insert(0, tempList[i]);
            }

            return (n > 0);
        }

        /// <summary>
        /// 移动到最下
        /// Move selected items to back (end of the list)
        /// </summary>
        /// <returns>
        /// true if at least one object is moved
        /// </returns>
        public bool MoveSelectionToBack()
        {
            int n;
            int i;
            DrawList tempList;

            tempList = new DrawList();
            n = graphicsList.Count;

            // Read source list in reverse order, add every selected item
            // to temporary list and remove it from source list
            for (i = n - 1; i >= 0; i--)
            {
                if ((graphicsList[i]).Selected)
                {
                    tempList.Add(graphicsList[i]);
                    graphicsList.RemoveAt(i);
                }
            }

            // Read temporary list in reverse order and add every item
            // to the end of the source list
            n = tempList.Count;

            for (i = n - 1; i >= 0; i--)
            {
                graphicsList.Add(tempList[i]);
            }

            return (n > 0);
        }

        #endregion

        /// <summary>
        /// 判断是否存在视场
        /// </summary>
        /// <returns></returns>
        public bool IsExsitView()
        {
            if (this.graphicsList != null && this.graphicsList.Count > 0
                && this.graphicsList.FindAll(a => a.objectType == DrawClass.View).Count > 0)
            {
                return true;
            }
            return false;
        }

        /// <summary>
        /// 获取画布内指定大类的集合
        /// </summary>
        /// <returns></returns>
        public List<DrawObject> GetDrawClassList(DrawClass drawClass)
        {
            return this.graphicsList.FindAll(a => a.objectType == drawClass);
        }

        /// <summary>
        /// 检测当前画板内是否存在指定的类型
        /// </summary>
        /// <param name="drawToolType"></param>
        /// <returns></returns>
        public bool IsExsitSpecificObject(DrawToolType drawToolType)
        {
            if (this.graphicsList != null && this.graphicsList.Count > 0)
                return this.graphicsList.FindAll(a => a.drawToolType == drawToolType).Count > 0;
            return false;
        }

        /// <summary>
        /// 获取画板内指定类型的集合
        /// </summary>
        /// <param name="drawToolType"></param>
        /// <returns></returns>
        public List<DrawObject> GetDrawToolTypeList(DrawToolType drawToolType)
        {
            return this.graphicsList.FindAll(a => a.drawToolType == drawToolType);
        }

        public DrawObject GetById(int id)
        {
            return this.graphicsList.Find(a => a.ID == id);
        }

        public List<LabelMeasureDataModel> GetLabelsOrMeasureData(DrawClass drawClass)
        {
            List<LabelMeasureDataModel> list = new List<LabelMeasureDataModel>();
            foreach (DrawObject o in graphicsList)
            {
                if (o.objectType == drawClass)
                {
                    LabelMeasureDataModel labelData = new LabelMeasureDataModel();
                    labelData.drawClass = o.objectType.ToString();
                    labelData.drawToolType = o.drawToolType.ToString();
                    labelData.points = o.GetPoints();
                    labelData.style = o.GetStyle();
                    labelData.content = o.GetContent();
                    list.Add(labelData);
                }
            }
            return list;
        }
    }
}