using System;
using System.Windows.Forms;
using System.Drawing;
using static Chess.Piece;
using System.Windows;

namespace Chess
{
    public class Field : Button
    {
        static readonly FieldColorSet primaryNormalColorSet = new FieldColorSet(Color.FromArgb(204, 204, 204), Color.FromArgb(153, 153, 153), Color.White);
        static readonly FieldColorSet secondaryNormalColorSet = new FieldColorSet(Color.FromArgb(51, 51, 51), Color.FromArgb(102, 102, 102), Color.Black);
        static readonly FieldColorSet primarySelectedColorSet = new FieldColorSet(Color.FromArgb(204, 204, 102), Color.FromArgb(153, 153, 102), Color.FromArgb(255, 255, 102));
        static readonly FieldColorSet secondarySelectedColorSet = new FieldColorSet(Color.FromArgb(204, 204, 51), Color.FromArgb(153, 153, 51), Color.FromArgb(255, 255, 51));
        static readonly FieldColorSet primaryValidFriendlyTargetFieldSet = new FieldColorSet(Color.FromArgb(102, 204, 102), Color.FromArgb(102, 153, 102), Color.FromArgb(102, 255, 102));
        static readonly FieldColorSet secondaryValidFriendlyTargetFieldSet = new FieldColorSet(Color.FromArgb(51, 204, 51), Color.FromArgb(51, 153, 51), Color.FromArgb(51, 255, 51));
        static readonly FieldColorSet primaryValidEnemyTargetFieldSet = new FieldColorSet(Color.FromArgb(204, 102, 102), Color.FromArgb(153, 102, 102), Color.FromArgb(255, 102, 102));
        static readonly FieldColorSet secondaryValidEnemyTargetFieldSet = new FieldColorSet(Color.FromArgb(204, 51, 51), Color.FromArgb(153, 51, 51), Color.FromArgb(255, 51, 51));
        public Vector location;
        private FieldColorSet currentNormalColorSet;
        private FieldColorSet currentEnemyColorSet;
        private FieldColorSet currentSelectedColorSet;
        private FieldColorSet currentAllyColorSet;
        public delegate void ClickEventHandler(Vector coordinates);
        public event ClickEventHandler FieldClick;
        public bool IsEmpty { get { return currentPiece == null; } }
        public Piece currentPiece;
        public Piece CurrentPiece
        {
            get { return currentPiece; }
            set { currentPiece = value; RefreshPiece(); }
        }

        private void RefreshPiece()
        {
            if (currentPiece == null)
                this.BackgroundImage = ChessPanel.Properties.Resources.Empty;
            else
                this.BackgroundImage = CurrentPiece.image;
        }
        public void Deselect()
        {
            setActiveColorSet(currentNormalColorSet);
        }
        public void Highlight(PieceTeam team) // validTargetField
        {
            switch (team)
            {
                case PieceTeam.Enemy:
                    setActiveColorSet(currentEnemyColorSet);
                    break;
                case PieceTeam.Ally:
                    setActiveColorSet(currentAllyColorSet);
                    break;
                default:
                    break;
            }
        }
        public new void Select() // selectedField
        {
            setActiveColorSet(currentSelectedColorSet);
        }
        private void setActiveColorSet(FieldColorSet set)
        {
            this.BackColor = set.NormalColor;
            this.FlatAppearance.MouseDownBackColor = set.MouseDownColor;
            this.FlatAppearance.MouseOverBackColor = set.MouseOverColor;
        }
        public Field(int x, int y)
        {
            this.currentNormalColorSet = (x + y) % 2 == 0 ? primaryNormalColorSet : secondaryNormalColorSet;
            this.currentAllyColorSet = (x + y) % 2 == 0 ? primaryValidFriendlyTargetFieldSet : secondaryValidFriendlyTargetFieldSet;
            this.currentEnemyColorSet = (x + y) % 2 == 0 ? primaryValidEnemyTargetFieldSet : secondaryValidEnemyTargetFieldSet;
            this.currentSelectedColorSet = (x + y) % 2 == 0 ? primarySelectedColorSet : secondarySelectedColorSet;


            this.FlatStyle = FlatStyle.Flat;
            this.FlatAppearance.BorderSize = 0;
            this.setActiveColorSet(this.currentNormalColorSet);
            this.Cursor = Cursors.Arrow;

            this.location = new Vector(x, y); // NICHT L(!)ocation, der gibt die Position des Buttons in Pixel auf dem Control an!
            this.Name = string.Format($"field[{x},{y}]");
            this.Text = "";

            this.BackgroundImageLayout = ImageLayout.Zoom;
            this.BackgroundImage = ChessPanel.Properties.Resources.Empty;

            this.Click += clicked;
        }

        private void clicked(object sender, EventArgs e)
        {
            FieldClick(this.location);
        }
        public override string ToString()
        {
            return this.currentPiece.type.ToString();
        }
    }
}