using Microsoft.Maui.Graphics;
using System.Collections.Generic;

namespace NotesDataAnalyst
{
    public class GraphDrawable : IDrawable
    {
        private readonly List<GraphNode> _nodes;
        private readonly List<GraphConnection> _connections;

        public GraphDrawable(List<GraphNode> nodes, List<GraphConnection> connections)
        {
            _nodes = nodes;
            _connections = connections;
        }

        private void DrawConnection(ICanvas canvas, GraphConnection connection)
        {
            var startX = connection.FromNode.Position.X + connection.FromNode.Size.Width / 2;
            var startY = connection.FromNode.Position.Y + connection.FromNode.Size.Height / 2;
            var endX = connection.ToNode.Position.X + connection.ToNode.Size.Width / 2;
            var endY = connection.ToNode.Position.Y + connection.ToNode.Size.Height / 2;

            canvas.StrokeColor = Colors.Gray;
            canvas.StrokeSize = 2;
            canvas.DrawLine((float)startX, (float)startY, (float)endX, (float)endY);
        }


        private void DrawNode(ICanvas canvas, GraphNode node)
        {
            canvas.FillColor = node.BackgroundColor;
            canvas.FillRectangle((float)node.Position.X, (float)node.Position.Y, (float)node.Size.Width, (float)node.Size.Height);

            canvas.FontColor = Colors.Black;
            canvas.DrawString(node.Text, (float)node.Position.X + 10, (float)node.Position.Y + 20, HorizontalAlignment.Left);
        }

        public void Draw(ICanvas canvas, RectF dirtyRect)
        {
            canvas.StrokeColor = Colors.Black;
            canvas.StrokeSize = 2;

            // Отрисовка связей
            foreach (var connection in _connections)
            {
                canvas.DrawLine(
                    (float)connection.FromNode.Position.X, (float)connection.FromNode.Position.Y,
                    (float)connection.ToNode.Position.X, (float)connection.ToNode.Position.Y);
            }

            // Отрисовка узлов
            foreach (var node in _nodes)
            {
                // Заливка фона узла
                canvas.FillColor = node.BackgroundColor;
                canvas.FillRectangle((float)node.Position.X, (float)node.Position.Y, (float)node.Size.Width, (float)node.Size.Height);

                // Отрисовка текста
                canvas.FontColor = Colors.Black;
                canvas.DrawString(node.Text, (float)node.Position.X + 5, (float)node.Position.Y + 5, HorizontalAlignment.Left);

                // Если нода выбрана, рисуем пунктирную обводку и "ручку" для изменения размера
                if (node.IsActive)
                {
                    canvas.StrokeColor = Colors.Blue;
                    canvas.StrokeDashPattern = new float[] { 4, 2 };
                    canvas.DrawRectangle((float)node.Position.X, (float)node.Position.Y, (float)node.Size.Width, (float)node.Size.Height);

                    // Ручка для изменения размера
                    canvas.FillColor = Colors.Gray;
                    canvas.FillRectangle(
                        (float)(node.Position.X + node.Size.Width - 10),
                        (float)(node.Position.Y + node.Size.Height - 10),
                        10, 10);
                }
            }
        }
    }
}