using LinqToDB.Tools;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json.Serialization;
using Pf2eModel;
using Pf2eModel.Model;
using Pf2eModel.Model.Base;
using Pf2eModel.Model.Enum;
using static LinqToDB.Common.Configuration;

namespace Pf2eViewer;

public partial class MainViewForm : Form
{
    public Pf2eDbContext Context = new();

    public MainViewForm()
    {
        InitializeComponent();
        Reset();

        EntityGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    }

    public void Reset()
    {
        Context.Dispose();
        Context = new();

        TypesListBox.DataSource = Context.Entities.Select(e => e.Type).Distinct().ToList();
        TypesListBox.SelectedIndex = 0;
    }

    public const int PerPage = 30;

    public int Count;

    public int Page
    {
        get => Convert.ToInt32(PageTextBox.Text);
        set
        {
            PageTextBox.Text = value.ToString();
            UpdateTreeView();
        }
    }

    public int MaxPage => Convert.ToInt32(Math.Ceiling(1.0 * Count / PerPage));


    private void UpdateTreeView()
    {
        EntityTreeView.Nodes.Clear();
        EntityType type = (EntityType) TypesListBox.SelectedItem!;

        Count = Context.Entities.Count(e => e.Type == type);

        if (Page < 1 || Page > MaxPage)
        {
            Page = Math.Min(MaxPage, Math.Max(1, Page));
            return;
        }

        EntityGridView.DataSource = Context.Entities
            .Where(e => e.Type == (EntityType) TypesListBox.SelectedItem)
            .OrderBy(e => e.Id)
            .Select(e => new EntityGridRow(e))
            .Skip((Page - 1) * PerPage)
            .Take(PerPage)
            .ToList();

        EntityGridView.Rows[0].Selected = true;

        PaginationLabel.Text = $"Всего: {Count} объектов, {MaxPage} страниц";

        FirstPageButton.Enabled = Page > 1;
        PrevPageButton.Enabled = Page > 1;
        NextPageButton.Enabled = Page < MaxPage;
        LastPageButton.Enabled = Page < MaxPage;
    }

    private void TypesListBox_SelectedIndexChanged(object sender, EventArgs _)
    {
        if (TypesListBox.SelectedItem is null)
        {
            return;
        }

        Page = 1;
    }
    private void FirstPageButton_Click(object sender, EventArgs e)
    {
        Page = 1;
    }
    private void PrevPageButton_Click(object sender, EventArgs e)
    {
        Page--;
    }
    private void NextPageButton_Click(object sender, EventArgs e)
    {
        Page++;
    }
    private void LastPageButton_Click(object sender, EventArgs e)
    {
        Page = MaxPage;
    }
    private void PageTextBox_KeyPress(object sender, KeyPressEventArgs e)
    {
        if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar))
        {
            e.Handled = true;
        }

        if (e.KeyChar == (char) Keys.Return)
        {
            UpdateTreeView();
        }
    }


    private void EntityGridView_RowStateChanged(object sender, DataGridViewRowStateChangedEventArgs e)
    {
        int rowsCount = EntityGridView.SelectedRows.Count;
        if (rowsCount is 0 or > 1)
        {
            return;
        }

        DataGridViewRow row = EntityGridView.SelectedRows[0];

        EntityGridRow data = (EntityGridRow) row.DataBoundItem;

        ViewEntity(data.Id);
    }

    public void ViewEntity(int id)
    {
        EntityTreeView.Nodes.Clear();

        Entity? entity = Context.Entities
                .Where(e => e.Id == id && e.Type == (EntityType) TypesListBox.SelectedItem!)
                .Include(e => e.Sources)
                .ThenInclude(s => s.Source)
                .Include(e => e.Aliases)
                .Include(e => e.Keywords)
                .Include(e => e.Externals)
                .ThenInclude(x => x.Target)
                .Include(e => e.Traits)
                .ThenInclude(t => t.Entity)
                .FirstOrDefault()
            ;

        if (entity == null)
        {
            DescriptionTextBox.Text = "Not found";
            return;
        }


        string json = SerializeEntity(entity);

        JsonToTreeview(EntityTreeView, json, "Entity");

        DescriptionTextBox.Text = entity.Description.Replace("\\r", "").Replace("\\n", "\\r\\n");
    }



    public string SerializeEntity(Entity entity)
    {
        JsonSerializerSettings settings = new()
        {
            Converters = [
                new EntityConverter(),
                new StringEnumConverter { NamingStrategy = new CamelCaseNamingStrategy() },
            ],
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
        };

        string result = JsonConvert.SerializeObject(entity, settings);

        Type type = EntityOfTypeAttribute.Resolve(entity);
        string subResult = JsonConvert.SerializeObject(ResolveSubEntity(entity), settings);

        return result[..^1] + $",\"SubEntity\":{subResult}}}";
    }

    public IEntity? ResolveSubEntity(Entity entity)
    {
        switch (entity.Type)
        {
            case EntityType.Ancestry:
                return Context.Ancestries
                    .Include(a => a.AncestryBoosts)
                    .FirstOrDefault(e => e.Id == entity.Id);

            case EntityType.Archetype:
                return Context.Archetypes
                    .Include(a => a.DedicationFeat)
                    .ThenInclude(f => f.Entity)
                    .Include(a => a.Feats)
                    .ThenInclude(f => f.Entity)
                    .FirstOrDefault(a => a.Id == entity.Id);

            case EntityType.Background:
                return Context.Backgrounds
                    .Include(b => b.BackgroundBoosts)
                    .Include(b => b.BackgroundSkills)
                    .ThenInclude(t => t.Training)
                    .Include(b => b.BackgroundItems)
                    .FirstOrDefault(e => e.Id == entity.Id);

            case EntityType.Class:
                return Context.Classes
                    .Include(c => c.ClassKeyAbilities)
                    .Include(c => c.ClassTrainings)
                    .ThenInclude(t => t.Training)
                    .Include(c => c.ClassProgressions)
                    .FirstOrDefault(c => c.Id == entity.Id);

            case EntityType.Feat:
                return Context.Feats
                    .Include(f => f.Archetypes)
                    .ThenInclude(a => a.Entity)
                    .FirstOrDefault(f => f.Id == entity.Id);

            default:
                Type type = EntityOfTypeAttribute.Resolve(entity);
                return (IEntity?) Context.Find(type, entity.Id);
        }
    }

    public static void JsonToTreeview(TreeView treeView, string jsonString, string rootName)
    {
        object json = jsonString.StartsWith('[')
                        ? JArray.Parse(jsonString)
                        : JObject.Parse(jsonString);

        treeView.Nodes.Clear();
        foreach (TreeNode node in Element2TreeNode(json, rootName).Nodes)
        {
            treeView.Nodes.Add(node);
        }
        treeView.ExpandAll();
    }

    private static TreeNode Element2TreeNode(object element, string text = "")
    {
        List<TreeNode> subNodes = [];

        switch (element.GetType().Name)
        {
            case "JObject":
                JObject jObject = (JObject) element;
                foreach (KeyValuePair<string, JToken> token in jObject)
                {
                    subNodes.Add(Element2TreeNode(token.Value, token.Key));
                }
                break;

            case "JArray":
                JArray jArray = (JArray) element;
                int i = 0;
                subNodes.AddRange(jArray.Select(token => Element2TreeNode(token, $"[{i++}]")));

                if (i == 0)
                {
                    text += ": []";
                }
                break;

            case "JValue":
                JValue jValue = (JValue) element;
                text += $": ({jValue.Type}) {jValue}";
                break;

            default:
                throw new Exception("clsJSON2Treeview can't interpret object:" + element.GetType().Name);
        }

        TreeNode treeNode = new(text);

        if (subNodes.Count > 0)
        {
            treeNode.Nodes.AddRange(subNodes
                .OrderBy(node => node.Nodes.Count > 0 ? 1 : 0)
                .ToArray()
                );
        }

        return treeNode;
    }

    private class EntityGridRow(Entity e)
    {
        public int Id { get; set; } = e.Id;
        public string Name { get; set; } = e.Name.ToString();
        public EntityRarity Rarity { get; set; } = e.Rarity;

        private readonly Entity _e = e;
        public Entity GetEntity() => _e;

    }

}