using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using Pf2eModel;
using Pf2eModel.Model.Base;
using Pf2eModel.Model.Common.I18n;
using Pf2eModel.Model.Enum;

namespace Pf2eViewer;

public partial class DatabaseViewerControl : UserControl
{
    public readonly Pf2eDbContext Context = new();

    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public int PerPage
    {
        get => _perPage;
        set
        {
            _perPage = value;
            UpdateView();
        }
    }
    private int _perPage = 30;

    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public int Page
    {
        get => _page;
        set
        {
            _page = value;
            UpdateView();
        }
    }
    private int _page = 1;

    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public EntityType Type
    {
        get => _type;
        set
        {
            _type = value;
            UpdateView();
        }
    }
    private EntityType _type;

    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public int Count { get; private set; } = 0;

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

    [AllowNull]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
    public EntityView CurrentEntity { get; private set; }

    private bool _updating = false;

    public DatabaseViewerControl()
    {
        InitializeComponent();

        BindingNavigator.BindingSource = DbBindingSource;
        DataGridView.AutoGenerateColumns = true;
        DataGridView.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    }

    private void DatabaseViewerControl_Load(object sender, EventArgs e)
    {
        UpdateView();
    }

    private void BindingNavigator_RefreshItems(object sender, EventArgs e)
    {
        if (_updating)
        {
            return;
        }

        Page = (int)(BindingNavigator?.BindingSource?.Current ?? 1);
        UpdateView();
    }

    public void UpdateView()
    {
        _updating = true;

        IQueryable<Entity> query = Context.Entities.Where(e =>
            e.Type == Type
            && (
                // ReSharper disable once EntityFramework.UnsupportedServerSideFunctionCall
                SearchTextBox.Text == ""
                || Pf2eDbContext.LocaleSearch(e.Name, SearchTextBox.Text)
            )
        );

        Count = query.Count();

        PagesBindingSource.DataSource = Enumerable.Range(1, MaxPage).ToList();
        BindingNavigator.BindingSource = PagesBindingSource;

        DbBindingSource.DataSource = query
            .Skip((Page - 1) * PerPage)
            .Take(PerPage)
            .Select(e => new EntityGridRow(e))
            .ToList();

        if (DataGridView.Rows.Count > 0)
        {
            DataGridView.Rows[0].Selected = true;
        }
        DataGridView.Update();

        _updating = false;
    }

    private void DataGridView_RowStateChanged(object sender, DataGridViewRowStateChangedEventArgs e)
    {
        if (DataGridView.SelectedRows.Count == 0)
        {
            return;
        }

        EntityGridRow data = (EntityGridRow)DataGridView.SelectedRows[0].DataBoundItem;
        CurrentEntity = new(Context, Type, data.Id);

        EntityChange?.Invoke(CurrentEntity);
    }

    public delegate void EntityChangeHandler(EntityView newEntity);

    public event EntityChangeHandler? EntityChange;

    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;
    }
}