using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using HeuristicLab.Common;
using HeuristicLab.Optimization;
using HeuristicLab.PluginInfrastructure;

namespace HeuristicLab.JsonInterface.OptimizerIntegration {
  public partial class ExportJsonDialog : Form {

    #region Private Properties
    private static FolderBrowserDialog FolderBrowserDialog { get; set; }
    private IDictionary<TreeNode, UserControl> Node2Control { get; set; } = new Dictionary<TreeNode, UserControl>();
    private IDictionary<TreeNode, IJsonItemVM> Node2VM { get; set; } = new Dictionary<TreeNode, IJsonItemVM>();
    private IDictionary<Type, Type> JI2VM { get; set; }
    private IJsonItem Root { get; set; }
    private IOptimizer Optimizer { get; set; }
    private IList<IJsonItemVM> VMs { get; set; }
    #endregion

    private IContent content;
    public IContent Content {
      get => content;
      set {
        content = value;

        #region Clear
        VMs = new List<IJsonItemVM>();
        treeView.Nodes.Clear();
        treeViewResults.Nodes.Clear();
        #endregion

        Optimizer = content as IOptimizer;
        if(Optimizer != null) {
          Optimizer = (IOptimizer)Optimizer.Clone(); // clone the optimizer
          Root = JsonItemConverter.Extract(Optimizer);
          TreeNode parent = new TreeNode(Root.Name);
          treeView.AfterCheck += TreeView_AfterCheck;
          BuildTreeNode(parent, Root);
          treeView.Nodes.Add(parent);
          treeView.ExpandAll();
          panelParameterDetails.Controls.Clear();
          panelResultDetails.Controls.Clear();
        }
      } 
    }

    private void InitCache() {
      JI2VM = new Dictionary<Type, Type>();
      foreach (var vmType in ApplicationManager.Manager.GetTypes(typeof(IJsonItemVM))) {
        IJsonItemVM vm = (IJsonItemVM)Activator.CreateInstance(vmType);
        JI2VM.Add(vm.TargetedJsonItemType, vmType);
      }
    }

    public ExportJsonDialog() {
      InitializeComponent();
      this.Icon = HeuristicLab.Common.Resources.HeuristicLab.Icon;
      InitCache();
    }

    private void exportButton_Click(object sender, EventArgs e) {
      if (FolderBrowserDialog == null) {
        FolderBrowserDialog = new FolderBrowserDialog();
        FolderBrowserDialog.Description = "Select .json-Template Directory";
      }

      if (FolderBrowserDialog.ShowDialog() == DialogResult.OK) {
        try {
          JsonTemplateGenerator.GenerateTemplate(
            Path.Combine(FolderBrowserDialog.SelectedPath, textBoxTemplateName.Text), 
            Optimizer, Root);
          Close();
        } catch (Exception ex) {
          ErrorHandling.ShowErrorDialog(this, ex);
        }
      }
    }

    private void BuildTreeNode(TreeNode node, IJsonItem item) {
      RegisterItem(node, item, treeView);
      if (item.Children != null) {
        foreach (var c in item.Children) {
          if (IsDrawableItem(c)) {
            TreeNode childNode = new TreeNode(c.Name);
            if (c is IResultJsonItem) {
              treeViewResults.Nodes.Add(childNode);
              IJsonItemVM vm = RegisterItem(childNode, c, treeViewResults);
              if (vm != null) vm.Selected = true;              
            } else {
              node.Nodes.Add(childNode);
              BuildTreeNode(childNode, c);
            }
          }
        }
      }
    }

    private IJsonItemVM RegisterItem(TreeNode node, IJsonItem item, TreeView tv) {
      if (JI2VM.TryGetValue(item.GetType(), out Type vmType)) {
        IJsonItemVM vm = (IJsonItemVM)Activator.CreateInstance(vmType);

        vm.Item = item;
        vm.TreeNode = node;
        vm.TreeView = tv;
        vm.Selected = false;

        VMs.Add(vm);
        Node2VM.Add(node, vm);
        UserControl control = JsonItemBaseControl.Create(vm, vm.Control);
        Node2Control.Add(node, control);
        return vm;
      } else {
        node.ForeColor = Color.LightGray;
        node.NodeFont = new Font(SystemFonts.DialogFont, FontStyle.Italic);
      }
      return null;
    }

    private bool IsDrawableItem(IJsonItem item) {
      bool b = false;
      if (item.Children != null) {
        foreach (var c in item.Children) {
          b = b || IsDrawableItem(c);
        }
      }
      
      return b || !(item is EmptyJsonItem) || !(item is UnsupportedJsonItem);
    }
    
    private void treeView_AfterSelect(object sender, TreeViewEventArgs e) {
      if(Node2Control.TryGetValue(treeView.SelectedNode, out UserControl control)) {
        SetControlOnPanel(control, panelParameterDetails);
      }
    }

    private void treeViewResults_AfterSelect(object sender, TreeViewEventArgs e) {
      if (Node2Control.TryGetValue(treeViewResults.SelectedNode, out UserControl control)) {
        SetControlOnPanel(control, panelResultDetails);
      }
    }

    private void textBoxTemplateName_Validating(object sender, CancelEventArgs e) {
      if (string.IsNullOrWhiteSpace(textBoxTemplateName.Text)) {
        errorProvider.SetError(textBoxTemplateName, "Template name must not be empty.");
        e.Cancel = true;
      } else {
        errorProvider.SetError(textBoxTemplateName, null);
      }
    }

    private void SetControlOnPanel(UserControl control, Panel panel) {
      panel.Controls.Clear();
      if (control != null) {
        panel.Controls.Add(control);
        control.Width = panel.Width;
        control.Height = panel.Height;
        control.Dock = DockStyle.Fill;
        control.Anchor = AnchorStyles.Top | AnchorStyles.Bottom | AnchorStyles.Left | AnchorStyles.Right;
      }
      panel.Refresh();
    }

    private void TreeView_AfterCheck(object sender, TreeViewEventArgs e) {
      if (e.Action != TreeViewAction.Unknown) {
        if (Node2VM.TryGetValue(e.Node, out IJsonItemVM vm)) {
          vm.Selected = e.Node.Checked;
        }
      }
    }

    private void treeViewResults_AfterCheck(object sender, TreeViewEventArgs e) {
      if (e.Action != TreeViewAction.Unknown) {
        if (Node2VM.TryGetValue(e.Node, out IJsonItemVM vm)) {
          vm.Selected = e.Node.Checked;
        }
      }
    }
  }
}