using System.Windows.Forms;
using Microsoft.EntityFrameworkCore;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Serialization;
using Pf2eModel;
using Pf2eModel.Model;
using Pf2eModel.Model.Base;
using Pf2eModel.Model.Common.I18n;
using Pf2eModel.Model.Enum;
using Pf2eViewer.Converters;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace Pf2eViewer;

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

    public readonly string JsonViewerHtml;

    public readonly DatabaseViewer Viewer = new();

    public MainViewForm()
    {
        InitializeComponent();

        _ = new DarkModeCS(this) { ColorMode = DarkModeCS.DisplayMode.SystemDefault };

        Reset();

        EntityGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;

        using StreamReader reader = new("Resources/json-viewer.html");
        JsonViewerHtml = reader.ReadToEnd();

        Viewer.ViewUpdateStart += Viewer_ViewUpdateStart;
        Viewer.ViewUpdate += Viewer_ViewUpdate;
        Viewer.ViewSelect += Viewer_ViewSelect;
    }

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

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

    private void ToggleFreeze(bool state)
    {
        EntityGridView.Visible = state;
        JsonWebView.Visible = state;

        FirstPageButton.Enabled = state;
        PrevPageButton.Enabled = state;
        NextPageButton.Enabled = state;
        LastPageButton.Enabled = state;

        PageTextBox.Enabled = state;
    }

    // Viewer events

    private void Viewer_ViewUpdateStart()
    {
        ToggleFreeze(false);
    }

    private void Viewer_ViewUpdate()
    {
        EntityGridView.DataSource = Viewer.Entities.Select(e => new EntityGridRow(e));

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

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

        ToggleFreeze(true);
    }

    private void Viewer_ViewSelect(Entity? entity, IEntity? subEntity)
    {
        JsonSerializerSettings settings = new()
        {
            Converters =
            [
                new StringEnumConverter { NamingStrategy = new CamelCaseNamingStrategy() },
                new EntityConverter(),
                new LocaleStringConverter(),
            ],
            ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
        };

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

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

        RenderJson(json);
    }

    // Form events

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

        Viewer.Page = 1;
    }

    private void FirstPageButton_Click(object sender, EventArgs e)
    {
        Viewer.Page = 1;
    }

    private void PrevPageButton_Click(object sender, EventArgs e)
    {
        Viewer.Page--;
    }

    private void NextPageButton_Click(object sender, EventArgs e)
    {
        Viewer.Page++;
    }

    private void LastPageButton_Click(object sender, EventArgs e)
    {
        Viewer.Page = Viewer.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)
        {
            Viewer.Page = Convert.ToInt32(PageTextBox.Text);
        }
    }

    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;

        Viewer.Select(data.GetEntity());
    }

    public void RenderJson(string json)
    {
        if (JsonWebView.CoreWebView2 == null)
        {
            JsonWebView.EnsureCoreWebView2Async();
            return;
        }

        string html = JsonViewerHtml.Replace("{JSON}", json);
        JsonWebView.CoreWebView2.NavigateToString(html);
    }

    private void JsonWebView_CoreWebView2InitializationCompleted(
        object sender,
        Microsoft.Web.WebView2.Core.CoreWebView2InitializationCompletedEventArgs e
    )
    {
        JsonWebView.Visible = true;
        Viewer_ViewSelect(Viewer.LastEntity, Viewer.LastSubEntity);
    }
}

internal class EntityGridRow(Entity e)
{
    public int Id { get; set; } = e.Id;
    public string Name { get; set; } = e.Name[LocaleType.English];
    public EntityRarity Rarity { get; set; } = e.Rarity;

    private readonly Entity _e = e;

    public Entity GetEntity() => _e;
}