/*
 * Greenshot - a free and open source screenshot tool
 * Copyright (C) 2007-2020 Thomas Braun, Jens Klingen, Robin Krom
 *
 * For more information see: http://getgreenshot.org/
 * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 1 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Runtime.Serialization;

using Greenshot.Drawing.Fields;
using Greenshot.Helpers;
using Greenshot.Plugin.Drawing;
using Greenshot.Drawing.Adorners;

namespace Greenshot.Drawing {
	/// <summary>
	/// Description of LineContainer.
	/// </summary>
	[Serializable()]
	public class LineContainer : DrawableContainer {
		public static readonly int MAX_CLICK_DISTANCE_TOLERANCE = 10;

		public LineContainer(Surface parent) : base(parent) {
			Init();
		}

		protected override void InitializeFields() {
			AddField(GetType(), FieldType.LINE_THICKNESS, 2);
			AddField(GetType(), FieldType.LINE_COLOR, Color.Red);
			AddField(GetType(), FieldType.SHADOW, true);
		}

		protected override void OnDeserialized(StreamingContext context)
		{
			Init();
		}

		protected void Init() {
			Adorners.Add(new MoveAdorner(this, Positions.TopLeft));
			Adorners.Add(new MoveAdorner(this, Positions.BottomRight));
		}

		public override void Draw(Graphics graphics, RenderMode rm) {
			graphics.SmoothingMode = SmoothingMode.HighQuality;
			graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
			graphics.CompositingQuality = CompositingQuality.HighQuality;
			graphics.PixelOffsetMode = PixelOffsetMode.None;

			int lineThickness = GetFieldValueAsInt(FieldType.LINE_THICKNESS);
			Color lineColor = GetFieldValueAsColor(FieldType.LINE_COLOR);
			bool shadow = GetFieldValueAsBool(FieldType.SHADOW);

			if (lineThickness > 0) {
				if (shadow) {
					//draw shadow first
					int basealpha = 100;
					int alpha = basealpha;
					int steps = 5;
					int currentStep = 1;
					while (currentStep <= steps)
                    {
                        using Pen shadowCapPen = new Pen(Color.FromArgb(alpha, 100, 100, 100), lineThickness);
                        graphics.DrawLine(shadowCapPen,
                            Left + currentStep,
                            Top + currentStep,
                            Left + currentStep + Width,
                            Top + currentStep + Height);

                        currentStep++;
                        alpha -= basealpha / steps;
                    }
				}

                using Pen pen = new Pen(lineColor, lineThickness);
                graphics.DrawLine(pen, Left, Top, Left + Width, Top + Height);
            }
		}

		public override bool ClickableAt(int x, int y) {
			int lineThickness = GetFieldValueAsInt(FieldType.LINE_THICKNESS) +5;
			if (lineThickness > 0)
            {
                using Pen pen = new Pen(Color.White)
                {
                    Width = lineThickness
                };
                using GraphicsPath path = new GraphicsPath();
                path.AddLine(Left, Top, Left + Width, Top + Height);
				return path.IsOutlineVisible(x, y, pen);
            }
			return false;
		}

		protected override ScaleHelper.IDoubleProcessor GetAngleRoundProcessor() {
			return ScaleHelper.LineAngleRoundBehavior.Instance;
		}
	}
}