using UnityEngine;
using UnityEditor.IMGUI.Controls;
using System.Collections.Generic;
using System.Linq;

namespace AssetBundleBrowser
{
    internal class InspectTreeItem : TreeViewItem
    {
        internal string bundlePath { get; private set; }

        internal InspectTreeItem(string path, int depth) : base(path.GetHashCode(), depth, path)
        {
            bundlePath = path;
        }

        internal InspectTreeItem(string path, int depth, string prettyName) : base(path.GetHashCode(), depth, prettyName)
        {
            bundlePath = path;
        }

        internal InspectTreeItem(string path, string parentPath, int depth, string prettyName) : base((path + parentPath).GetHashCode(), depth, prettyName)
        {
            bundlePath = path;
        }
    }

    internal class InspectBundleTree : TreeView
    {
        private AssetBundleInspectTab m_InspectTab;

        internal InspectBundleTree(TreeViewState s, AssetBundleInspectTab parent) : base(s)
        {
            m_InspectTab = parent;
            showBorder = true;
        }

        protected override TreeViewItem BuildRoot()
        {
            TreeViewItem root = new TreeViewItem(-1, -1);
            root.children = new List<TreeViewItem>();
            if (m_InspectTab == null)
                Debug.Log("Unknown problem in AssetBundle Browser Inspect tab.  Restart Browser and try again, or file ticket on github.");
            else
                foreach (KeyValuePair<string, List<string>> folder in m_InspectTab.BundleList)
                    if (string.IsNullOrEmpty(folder.Key))
                    {
                        foreach (string path in folder.Value)
                            root.AddChild(new InspectTreeItem(path, 0));
                    }
                    else
                    {
                        TreeViewItem folderItem = new TreeViewItem(folder.Key.GetHashCode(), 0, folder.Key);
                        foreach (string path in folder.Value)
                        {
                            string prettyName = path;
                            if (path.StartsWith(folder.Key)) //how could it not?
                                prettyName = path.Remove(0, folder.Key.Length + 1);

                            folderItem.AddChild(new InspectTreeItem(path, folder.Key, 1, prettyName));
                        }

                        root.AddChild(folderItem);
                    }

            return root;
        }

        public override void OnGUI(Rect rect)
        {
            base.OnGUI(rect);
            if (Event.current.type == EventType.MouseDown && Event.current.button == 0 && rect.Contains(Event.current.mousePosition)) SetSelection(new int[0], TreeViewSelectionOptions.FireSelectionChanged);
        }

        protected override void RowGUI(RowGUIArgs args)
        {
            base.RowGUI(args);
            if (args.item.depth == 0)
            {
                int width = 16;
                Rect edgeRect = new Rect(args.rowRect.xMax - width, args.rowRect.y, width, args.rowRect.height);
                if (GUI.Button(edgeRect, "-"))
                {
                    if (GetSelection().Contains(args.item.id))
                    {
                        IList<int> selection = GetSelection();
                        foreach (int id in selection)
                        {
                            TreeViewItem item = FindItem(id, rootItem);
                            if (item.depth == 0)
                                RemoveItem(item);
                        }
                    }
                    else
                    {
                        RemoveItem(args.item);
                    }

                    m_InspectTab.RefreshBundles();
                }
            }
        }

        private void RemoveItem(TreeViewItem item)
        {
            InspectTreeItem inspectItem = item as InspectTreeItem;
            if (inspectItem != null)
                m_InspectTab.RemoveBundlePath(inspectItem.bundlePath);
            else
                m_InspectTab.RemoveBundleFolder(item.displayName);
        }

        protected override void SelectionChanged(IList<int> selectedIds)
        {
            base.SelectionChanged(selectedIds);

            if (selectedIds == null)
                return;

            if (selectedIds.Count > 0)
                m_InspectTab.SetBundleItem(FindRows(selectedIds).Select(tvi => tvi as InspectTreeItem).ToList());
            //m_InspectTab.SetBundleItem(FindItem(selectedIds[0], rootItem) as InspectTreeItem);
            else
                m_InspectTab.SetBundleItem(null);
        }

        protected override bool CanMultiSelect(TreeViewItem item)
        {
            return true;
        }
    }
}