using System.IO;
using System.Windows.Controls;
using System.Windows.Shapes;
using System.Xml.Serialization;

namespace DrawGraph
{
    public class Import
    {
        public static Node[] NodesFromGraphML(string path)
        {
            if (File.Exists(path))
            {
                XmlSerializer xml = new XmlSerializer(typeof(Node));
                string xmlString = File.ReadAllText(path);
                Node[] nodes;
                using(TextReader reader = new StringReader(xmlString))
                {
                    nodes = (Node[])xml.Deserialize(reader);
                }
                return nodes;
            }
            else
            {
                throw new FileNotFoundException("File not found: " + path);
            }
        }

        public static Edge[] EdgesFromGraphML(string path)
        {
            if (File.Exists(path))
            {
                XmlSerializer xml = new XmlSerializer(typeof(Edge));
                string xmlString = File.ReadAllText(path);
                Edge[] edges;
                using (TextReader reader = new StringReader(xmlString))
                    edges = (Edge[])xml.Deserialize(reader);
                return edges;
            }
            else
            {
                throw new FileNotFoundException("File not found: " + path);
            }
        }

        public static void GraphMLToCanvas(string path, Canvas canvas)
        {
            Node[] nodes = NodesFromGraphML(path);
            Edge[] edges = EdgesFromGraphML(path);

            Ellipse[] ellipses = new Ellipse[nodes.Length];
            Line[] lines = new Line[edges.Length];
            ArrowLine[] arrowLines = new ArrowLine[edges.Length];
            for(int i = 0; i < nodes.Length; i++)
            {
                ellipses[i] = new Ellipse()
                {
                    Fill = Settings.FillColor,
                    Width = Settings.NodeWidth,
                    Height = Settings.NodeHeight
                };
                Canvas.SetLeft(ellipses[i], nodes[i].X);
                Canvas.SetTop(ellipses[i], nodes[i].Y);
                canvas.Children.Add(ellipses[i]);
            }

            for(int i = 0; i < edges.Length; i++)
            {
                if (edges[i].IsFocused)
                {
                    arrowLines[i] = new ArrowLine()
                    {
                        Stroke = Settings.FillColor,
                        StrokeThickness = Settings.StrokeThickness,
                        X1 = edges[i].SourceNode.GetCenterByX(),
                        X2 = edges[i].TargetNode.GetCenterByX(),
                        Y1 = edges[i].SourceNode.GetCenterByY(),
                        Y2 = edges[i].TargetNode.GetCenterByY()
                    };
                    canvas.Children.Add(arrowLines[i]);
                }
                else
                {
                    lines[i] = new Line()
                    {
                        Stroke = Settings.FillColor,
                        StrokeThickness = Settings.StrokeThickness,
                        X1 = edges[i].SourceNode.GetCenterByX(),
                        X2 = edges[i].TargetNode.GetCenterByX(),
                        Y1 = edges[i].SourceNode.GetCenterByY(),
                        Y2 = edges[i].TargetNode.GetCenterByY()
                    };
                    canvas.Children.Add(lines[i]);
                }
            }
        }
    }
}