using Cursach.Parameters;
using Cursach.Realisations;

namespace Cursach
{
    public partial class FormCreate : Form
    {
        private AdjacencyList _adjacencyList;
        private Node startNode = new Node(0);
        public event Action<BFSParameters>? parameterDelegate;

        private VizulizatorGraph? visualizatorGraph;

        public FormCreate()
        {
            InitializeComponent();
            _adjacencyList = new AdjacencyList();
            visualizatorGraph = new VizulizatorGraph();
            Draw();
        }

        private void buttonAddNode_Click(object sender, EventArgs e)
        {
        }

        private void buttonAddEdge_Click(object sender, EventArgs e)
        {
            if (!_adjacencyList.AddBind(new Bind(
                    node1: _adjacencyList.GetByNameNode(comboBoxNode1.SelectedItem.ToString()),
                    node2: _adjacencyList.GetByNameNode(comboBoxNode2.SelectedItem.ToString())
                )))
            {
                MessageBox.Show("Неверное ребро");
                return;
            }

            treeView.Nodes.Clear();
            foreach (var parentNode in _adjacencyList.Keys())
            {
                TreeNode smartNode = new TreeNode(parentNode.ToString());
                foreach (var childNode in _adjacencyList.Values(parentNode))
                {
                    smartNode.Nodes.Add(childNode.ToString());
                }

                treeView.Nodes.Add(smartNode);
            }

            treeView.ExpandAll();
            Draw();
        }

        private void buttonStart_Click(object sender, EventArgs e)
        {
            try
            {
                _adjacencyList.Mirror();
                BFSParameters parameter = new BFSParameters(startNode, _adjacencyList);
                parameterDelegate?.Invoke(parameter);
                Close();
            }
            catch (Exception exception)
            {
                MessageBox.Show("Граф пустой");
            }
            
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            MouseEventArgs me = (MouseEventArgs)e;
            Point coordinates = me.Location;

            _adjacencyList.AddNode(new Node(_adjacencyList.Keys().Count(), coordinates));
            comboBoxNode1.Items.Clear();
            comboBoxNode2.Items.Clear();
            foreach (var item in _adjacencyList.Keys())
            {
                comboBoxNode1.Items.Add(item);
                comboBoxNode2.Items.Add(item);
            }
            EnableAddEdgeButton();
            Draw();
        }

        private void Draw()
        {

            Bitmap bmp = new(pictureBox1.Width, pictureBox1.Height);
            Graphics gr = Graphics.FromImage(bmp);

            if (visualizatorGraph != null)
            {
                visualizatorGraph.Draw(gr, _adjacencyList);
            }

            pictureBox1.Image = bmp;
        }

        private void treeView_AfterSelect_1(object sender, TreeViewEventArgs e)
        {
            startNode = _adjacencyList.GetByNameNode(e.Node?.Text);
        }

        private void comboBoxNode1_SelectedIndexChanged(object sender, EventArgs e)
        {
            EnableAddEdgeButton();
        }

        private void comboBoxNode2_SelectedIndexChanged(object sender, EventArgs e)
        {
            EnableAddEdgeButton();
        }
        
        private void EnableAddEdgeButton()
        {
            buttonAddEdge.Enabled = comboBoxNode1.Text.Length > 0 && comboBoxNode2.Text.Length > 0;
        }
    }
}