using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using AntDesign.core.JsInterop.EventArg;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.JSInterop;

namespace AntDesign
{
    public partial class Tree : AntDomComponentBase
    {
        internal const string PREFIX_CLS = "ant-tree";

        internal void CallStateHasChanged()
        {
            StateHasChanged();
        }

        [Inject]
        public IJSRuntime JSRuntime { get; set; }

        //[Parameter]
        //public RenderFragment ChildContent { get; set; }

        [Parameter]
        public bool Checkable { get; set; }

        [Parameter]
        public bool CheckStrictly { get; set; } = false;

        [Parameter]
        public bool ShowIcon { get; set; }

        [Parameter]
        public bool ShowLine { get; set; }

        [Parameter]
        public string SwitcherIcon { get; set; }

        [Parameter]
        public RenderFragment<TreeNode> SwitcherIconTemplate { get; set; }

        [Parameter]
        public string IconType { get; set; }

        [Parameter]
        public EventCallback<TreeEventArgs> OnCheckedStateChanged { get; set; }

        [Parameter]
        public EventCallback<TreeEventArgs> OnNodeSelectedChanged { get; set; }

        [Parameter]
        public EventCallback<TreeEventArgs> OnNodeLoadDelay { get; set; }

        internal TreeNode _loadDelayNode;

        [Parameter]
        public RenderFragment<TreeNode> IconTemplate { get; set; }

        [Parameter]
        public RenderFragment<TreeNode> NodeTemplate { get; set; }

        private List<TreeNode> _nodelist;

        public List<TreeNode> NodeList
        {
            get
            {
                if (_nodelist == null) _nodelist = new List<TreeNode>();
                return _nodelist;
            }
        }

        [Parameter]
        public IReadOnlyCollection<TreeNode> Nodes
        {
            get
            {
                if (_nodelist != null)
                    return _nodelist;
                return Array.Empty<TreeNode>();
            }
            set
            {
                if (value == null || value.Count == 0)
                {
                    _nodelist = null;
                    return;
                }
                if (_nodelist == null) _nodelist = new List<TreeNode>();
                else if (_nodelist.Count != 0) _nodelist.Clear();
                _nodelist.AddRange(value);
            }
        }

        public void DeselectAll()
        {
            foreach (var node in Nodes)
                node?.DeselectAll();
        }

        protected override void OnInitialized()
        {
            base.OnInitialized();
            ClassMapper.Clear()
                .Add(PREFIX_CLS)
                .If($"{PREFIX_CLS}-icon-hide", () => !ShowIcon)
                .If($"{PREFIX_CLS}-show-line", () => ShowLine)
                ;
        }

        internal string _expandedAnimateRequested;

        protected override void OnAfterRender(bool firstRender)
        {
            base.OnAfterRender(firstRender);

            if (_expandedAnimateRequested != null)
            {
                string id = _expandedAnimateRequested;
                _expandedAnimateRequested = null;

#pragma warning disable CA2012 // Use ValueTasks correctly
                _ = JSRuntime.InvokeVoidAsync("eval", "var div=document.getElementById('" + id + "');"
                    + @"
if(div.style.height=='0px'){
    div.style.height=div.scrollHeight+'px';
    div.classList.add('ant-motion-collapse-appear-active')
}
else{
    div.style.height=div.offsetHeight+'px';
    setTimeout(function(){
        div.style.height='0px';
        div.classList.add('ant-motion-collapse-leave-active')
    },16);
}
"
);
#pragma warning restore CA2012 // Use ValueTasks correctly
            }
        }

        void CalcSwitcherIconOptions(TreeNode node, out string switchericonclass, out string switchericontype, out RenderFragment<TreeNode> switchericonrf)
        {
            switchericonclass = null;
            switchericontype = null;
            switchericonrf = node.SwitcherIconTemplate ?? this.SwitcherIconTemplate;

            var nodeHCN = node.HasChildNodes;

            if (switchericonrf == null)
            {
                switchericontype = node.SwitcherIcon ?? this.SwitcherIcon;
                switchericonclass = $"{PREFIX_CLS}-switcher-icon";

                if (string.IsNullOrEmpty(switchericontype))
                {
                    if (!this.ShowLine)
                    {
                        if (nodeHCN || node.LoadDelay)
                        {
                            switchericontype = "caret-down";
                        }
                        else
                        {
                            //noop
                        }
                    }
                    else if (!nodeHCN)
                    {
                        switchericontype = "file";
                        switchericonclass = $"{PREFIX_CLS}-switcher-icon-file";
                    }
                    else if (node.IsExpanded)
                    {
                        switchericontype = "minus-square";
                        switchericonclass = $"{PREFIX_CLS}-switcher-icon-file";
                    }
                    else
                    {
                        switchericontype = "plus-square";
                        switchericonclass = $"{PREFIX_CLS}-switcher-icon-file";
                    }
                }
            }

            if (_loadDelayNode == node && !nodeHCN)
            {
                switchericonclass = $"{PREFIX_CLS}-switcher-loading-icon anticon-spin";
                switchericontype = "loading";
                switchericonrf = null;
            }
            else if (!nodeHCN && !this.ShowLine && !node.LoadDelay)
            {
                switchericonrf = null;
                switchericontype = null;
            }
        }

        string GetCheckStateCls(TreeNode node)
        {
            bool? cs = node.CheckedState;
            if (cs == null)
                return "indeterminate";
            if (cs == true)
                return "checked";
            return "unchecked";
        }

        Func<MouseEventArgs, Task> MakeSwitcherClick(TreeNode node)
        {

            async Task switcherClick(MouseEventArgs args)
            {
                if (node.HasChildNodes)
                {
                    await node.ToggleExpandedAnimatedAsync();
                }
                else if (node.LoadDelay)
                {
                    this._loadDelayNode = node;
                    await this.OnNodeLoadDelay.InvokeAsync(new TreeEventArgs(this, node));
                    this._loadDelayNode = null;
                    if (node.HasChildNodes && !node.IsExpanded)
                    {
                        //this.CallStateHasChanged();
                        await node.ToggleExpandedAnimatedAsync();
                    }
                }
            }

            return switcherClick;

        }

        Func<MouseEventArgs, Task> MakeCheckClick(TreeNode node)
        {
            async Task checkClick(MouseEventArgs args)
            {
                if (node.IsDisabled)
                    return;
                if (this.CheckStrictly)
                    node.IsChecked = !node.IsChecked;
                else
                    node.SetCheckedAll(node.CheckedState != true);
                if (this.OnCheckedStateChanged.HasDelegate)
                {
                    await this.OnCheckedStateChanged.InvokeAsync(new TreeEventArgs(this, node));
                }
            }

            return checkClick;
        }


        Func<MouseEventArgs, Task> MakeNodeClick(TreeNode node)
        {

            async Task nodeClick(MouseEventArgs args)
            {
                if (node.IsDisabled)
                    return;

                if (node.IsSelected)
                {
                    node.IsSelected = false;
                }
                else
                {
                    if (!args.CtrlKey)//TODO: ownerTree.MultiSelect ?
                        this.DeselectAll();
                    node.IsSelected = true;
                }
                if (this.OnNodeSelectedChanged.HasDelegate)
                {
                    await this.OnNodeSelectedChanged.InvokeAsync(new TreeEventArgs(this, node));
                }
            }

            return nodeClick;
        }

    }
}