using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using RyzStudio.Windows.Forms;

namespace RyzStudio.Windows.TileForms
{
    public class TileContainer : RyzStudio.Windows.Forms.TTogglePanel
    {
        public TileContainer()
        {
            this.AllowDrop = true;
            this.ForeColor = Color.FromArgb(31, 31, 31);
            this.HeaderPadding = new Padding(10, 0, 0, 0);
        }

        private const int PADDING_BOTTOM = 10;

        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public Size TileSize { get; set; } = new Size(70, 70);

        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public int TileMargin { get; set; } = 3;

        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public bool AutoSizeHeight { get; set; } = false;

        [Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]
        public List<Tuple<System.Windows.Forms.Control, Point>> TileCollection { get; set; } = new List<Tuple<System.Windows.Forms.Control, Point>>();

        public int ColumnCount
        {
            get
            {
                if (this.TileCollection.Count <= 0)
                {
                    return 1;
                }

                return (this.TileCollection?.Max(x => x.Item2.X) ?? 0) + 1;
            }
        }

        public int RowCount
        {
            get
            {
                if (this.TileCollection.Count <= 0)
                {
                    return 1;
                }

                return (this.TileCollection?.Max(x => x.Item2.Y) ?? 0) + 1;
            }
        }

        public Size HotRectangle
        {
            get => new Size((this.ContentRectangle.Width - SystemInformation.VerticalScrollBarWidth), this.ContentRectangle.Height);
        }

        public Size GridSize
        {
            get
            {
                var tileWidth = TileSize.Width + TileMargin;
                var tileHeight = TileSize.Height + TileMargin;

                var columns = (int)Math.Floor(decimal.Divide(this.HotRectangle.Width, tileWidth));
                var rows = (int)Math.Floor(decimal.Divide(this.HotRectangle.Height, tileHeight));

                return new Size(columns, rows);
            }
        }


        protected override void OnControlAdded(ControlEventArgs e)
        {
            base.OnControlAdded(e);

            if (e.Control == null)
            {
                return;
            }

            if (!(e.Control is Tile))
            {
                return;
            }

            var newTile = (Tile)e.Control;
            newTile.OnMoved += (object sender, EventArgs e) =>
            {
                var control = (System.Windows.Forms.Control)sender;

                var coord = this.GetCoord(control);
                coord = this.ValidateCoord(coord);

                MoveTile(control, coord);
            };

            var coord = GetCoord(e.Control);

            MoveTile(e.Control, coord);
        }

        protected override void OnControlRemoved(ControlEventArgs e)
        {
            base.OnControlRemoved(e);

            var n = this.TileCollection.FindIndex(x => x.Item1 == e.Control);

            this.TileCollection.RemoveAt(n);
        }


        public void Add(Control control, int x, int y)
        {
            var pos = GetLocation(new Point(x, y));

            control.Location = pos;

            UIControl.Invoke(this, (x) => this.Controls.Add(control));
        }

        public void AddRow()
        {
            var gridSize = this.GridSize;

            this.AutoSize(gridSize.Width, (gridSize.Height + 1));
        }

        public void RemoveRow()
        {
            var gridSize = this.GridSize;
            var minGridSize = this.GetMinGridSize();

            var y = Math.Max((gridSize.Height - 1), minGridSize.Height);

            this.AutoSize(gridSize.Width, y);
        }

        public new void AutoSize(int x, int y)
        {
            var tileWidth = TileSize.Width + TileMargin;
            var tileHeight = TileSize.Height + TileMargin;

            var w = (tileWidth * x) + this.ContentRectangle.Left + SystemInformation.VerticalScrollBarWidth;
            var h = (tileHeight * y) + this.ContentRectangle.Top;
            h += PADDING_BOTTOM;

            this.ExpandedHeight = h;

            UIControl.Invoke(this, (x) => this.Size = new Size(w, h));

            this.IsOpen = this.IsOpen;
        }

        public void Clear()
        {
            if (this.TileCollection == null)
            {
                this.TileCollection = new List<Tuple<System.Windows.Forms.Control, Point>>();
            }

            this.Controls.Clear();
            this.TileCollection.Clear();
        }

        public Point GetCoord(System.Windows.Forms.Control control)
        {
            var tileWidth = TileSize.Width + TileMargin;
            var tileHeight = TileSize.Height + TileMargin;

            var x = control.Left - this.ContentRectangle.Left;
            var y = control.Top - this.ContentRectangle.Top;

            var colX = (int)Math.Floor(decimal.Divide(x, tileWidth));
            var colY = (int)Math.Floor(decimal.Divide(y, tileHeight));

            colX = Math.Max(colX, 0);
            colY = Math.Max(colY, 0);

            return new Point(colX, colY);
        }

        public Size GetMinGridSize()
        {
            var x = Math.Max(this.ColumnCount, 1);
            var y = Math.Max(this.RowCount, 1);

            return new Size(x, y);
        }

        public Point GetNextCoord()
        {
            var y = Math.Max(this.RowCount, 1) - 1;
            var x = -1;

            if (this.TileCollection.Count > 0)
            {
                x = (this.TileCollection?.Where(x => x.Item2.Y == y)?.Max(x => x.Item2.X) ?? 0);
            }

            return GetNextCoord(new Point(x, y));
        }

        public Point GetNextCoord(Point coord)
        {
            var gridSize = this.GridSize;

            var x = (coord.X + 1);
            var y = coord.Y;

            if (x >= gridSize.Width)
            {
                x = 0;
                y++;
            }

            return new Point(x, y);
        }

        public new void Invalidate()
        {
            base.Invalidate();

            if (this.TileCollection == null)
            {
                this.TileCollection = new List<Tuple<System.Windows.Forms.Control, Point>>();
            }

            this.TileCollection.Clear();

            foreach (var item in this.Controls)
            {
                var control = (System.Windows.Forms.Control)item;
                var coord = GetCoord(control);

                MoveTile(control, coord);
            }
        }

        public void MoveTile(System.Windows.Forms.Control control, Point newCoord)
        {
            var n = this.TileCollection.FindIndex(x => x.Item1 == control);
            if (n < 0)
            {
                // Add to collection
                this.TileCollection.Add(new Tuple<System.Windows.Forms.Control, Point>(control, newCoord));

                n = this.TileCollection.FindIndex(x => x.Item1 == control);
            }

            this.TileCollection[n] = new Tuple<Control, Point>(control, newCoord);

            var newLocation = GetLocation(newCoord);
            control.Location = new Point(newLocation.X, newLocation.Y);

            // Auto-resize for height
            if (this.AutoSizeHeight)
            {
                var gridSize = this.GridSize;
                var newHeight = (this.TileCollection?.Max(x => x.Item2.Y) ?? 0) + 1;

                this.AutoSize(gridSize.Width, Math.Max(gridSize.Height, newHeight));
            }

            // Handle displaced tile
            var duplicateTile = this.TileCollection.Where(x => ((x.Item1 != control) && (x.Item2 == newCoord))).FirstOrDefault();
            if (duplicateTile != null)
            {
                var nextCoord = GetNextCoord(newCoord);

                MoveTile(duplicateTile.Item1, nextCoord);
            }
        }

        public Point ValidateCoord(Point coord)
        {
            var gridSize = this.GridSize;

            var x = coord.X;
            var y = coord.Y;

            if (x >= gridSize.Width)
            {
                x = 0;
                y++;
            }

            return new Point(x, y);
        }


        protected Point GetLocation(Point coord)
        {
            var tileWidth = TileSize.Width + TileMargin;
            var tileHeight = TileSize.Height + TileMargin;

            var posX = (coord.X * tileWidth) + this.ContentRectangle.Left;
            var posY = (coord.Y * tileHeight) + this.ContentRectangle.Top;

            return new Point(posX, posY);
        }

    }
}