using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Reflection;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
using Microsoft.EntityFrameworkCore.Metadata.Internal;

namespace Pf2eViewer;

public partial class EntityTreeViewerControl : UserControl
{
    private int _itemHeight = 20;

    private EntityView? _entityView = null;

    public int ItemHeight
    {
        get => _itemHeight;
        set
        {
            _itemHeight = value;
            UpdateView();
        }
    }

    public EntityView? EntityView
    {
        get => _entityView;
        set
        {
            _entityView = value;
            UpdateView();
        }
    }

    public EntityTreeViewerControl()
    {
        InitializeComponent();
    }

    public void UpdateView()
    {
        ContentPanel.Controls.Clear();

        if (EntityView?.Entity is null)
        {
            return;
        }

        Rows.Clear();

        Rows.Add(new HeaderRow("Entity"));
        Rows.Add(new ObjectComplex(null, EntityView.Entity));
        Rows.Add(new HeaderRow(EntityView.SubEntity?.GetType().ToString() ?? "SubEntity"));
        Rows.Add(new ObjectComplex(null, EntityView.SubEntity));

        List<DisplayRow> displayRows = Rows.SelectMany(r => r.GetTextRows()).ToList();

        for (int i = 0; i < displayRows.Count; i++)
        {
            DisplayRow dr = displayRows[i];

            TextBox tb = new()
            {
                Top = i * ItemHeight,
                Left = 0,
                Width = ContentPanel.Width,
                Height = ItemHeight,
                Font = Font,
                Text = string.Join(
                    "",
                    [new(' ', dr.Depth * 2), dr.Name, dr.Value != "" ? " : " : "", dr.Value]
                ),
                Margin = new(0),
            };

            ContentPanel.Controls.Add(tb);
        }
    }

    private Panel GetObjectPanel(object obj)
    {
        Panel result = new();

        Type type = obj.GetType();

        PropertyInfo[] properties = type.GetProperties();
        /*
        FieldInfo[] fields = type.GetFields(
            BindingFlags.Instance
                | BindingFlags.Static
                | BindingFlags.NonPublic
                | BindingFlags.Public
        );
        */
        for (int i = 0; i < properties.Length; i++)
        {
            PropertyInfo property = properties[i];

            TextBox tb = new()
            {
                Top = i * ItemHeight,
                Left = 0,
                Width = ContentPanel.Width,
                Height = ItemHeight,
                Font = Font,
                Text = property.Name,
                Margin = new(0),
            };

            result.Controls.Add(tb);
        }

        result.Width = ContentPanel.Width;
        result.Height = properties.Length * ItemHeight * 2;

        return result;
    }

    private List<Row> Rows = [];

    private class DisplayRow
    {
        public string Name = "";

        public string Value = "";

        public int Depth = 0;
    }

    private abstract class Row
    {
        public abstract ICollection<DisplayRow> GetTextRows();

        public int Depth = 0;
    }

    private class HeaderRow(string name) : Row
    {
        public readonly string Name = name;

        public override ICollection<DisplayRow> GetTextRows()
        {
            return [new() { Name = Name, Depth = Depth }];
        }
    }

    private abstract class ObjectField(PropertyInfo property, object? parent) : Row
    {
        public readonly PropertyInfo? Property = property;

        public readonly string Name = property.Name;

        public readonly Type Type = property.PropertyType;

        public abstract int Rows { get; }

        public static ObjectField Resolve(PropertyInfo property, object? parent)
        {
            return property.PropertyType.IsPrimitive
                ? new ObjectPrimitive(property, parent)
                : new ObjectComplex(property, parent);
        }
    }

    private class ObjectPrimitive : ObjectField
    {
        public readonly object? Value;

        public override int Rows => 1;

        public ObjectPrimitive(PropertyInfo? property, object? parent)
            : base(property, parent)
        {
            Value = Property.GetValue(parent, null);
        }

        public override ICollection<DisplayRow> GetTextRows()
        {
            return
            [
                new()
                {
                    Name = Name,
                    Value = Value?.ToString() ?? "null",
                    Depth = Depth,
                },
            ];
        }
    }

    private class ObjectComplex : ObjectField
    {
        public readonly List<ObjectField> Fields;

        public bool Collapsed = false;

        public override int Rows => 1 + Fields.Select(f => f.Rows).Sum();

        public ObjectComplex(PropertyInfo? property, object? parent)
            : base(property, parent)
        {
            PropertyInfo[] properties = Type.GetProperties();

            object? value = Property?.GetValue(parent, null) ?? parent;

            Fields = properties.Select(f => Resolve(f, value)).ToList();
        }

        public override ICollection<DisplayRow> GetTextRows()
        {
            List<DisplayRow> rows = [new() { Name = Name, Depth = Depth }];

            if (!Collapsed)
            {
                rows.AddRange(Fields.SelectMany(f => f.GetTextRows()).ToList());
            }

            return rows;
        }
    }
}