using DevExpress.Blazor;
using Microsoft.AspNetCore.Components;
using System.Reflection;

namespace AyCode.Blazor.Components.Components.Grids;

public partial class MgGridInfoPanel<TDataItem> : ComponentBase where TDataItem : class
{
    private DxGrid? _currentGrid;
    private TDataItem? _currentDataItem;
    private List<DxGridDataColumn> _allDataColumns = [];

    /// <summary>
    /// Refreshes the InfoPanel with data from the specified grid row
    /// </summary>
    /// <param name="grid">The grid instance</param>
    /// <param name="dataItem">The data item from the focused row</param>
    public void RefreshData(DxGrid grid, TDataItem? dataItem)
    {
        ArgumentNullException.ThrowIfNull(grid);
        
        _currentGrid = grid;
        _currentDataItem = dataItem;

        if (_currentGrid != null && _currentDataItem != null)
        {
            _allDataColumns = GetAllDataColumns(_currentGrid);
        }
        else
        {
            _allDataColumns = [];
        }

        InvokeAsync(StateHasChanged);
    }

    /// <summary>
    /// Clears the InfoPanel
    /// </summary>
    public void Clear()
    {
        _currentGrid = null;
        _currentDataItem = null;
        _allDataColumns = [];
        InvokeAsync(StateHasChanged);
    }

    private List<DxGridDataColumn> GetAllDataColumns(DxGrid grid)
    {
        var columns = new List<DxGridDataColumn>();

        try
        {
            var allColumns = grid.GetDataColumns();
            if (allColumns != null)
            {
                foreach (var column in allColumns)
                {
                    // Minden DxGridDataColumn-t felveszünk, ha van FieldName-je
                    // NEM vizsgáljuk a Visible property-t!
                    if (column is DxGridDataColumn dataColumn && 
                        !string.IsNullOrWhiteSpace(dataColumn.FieldName))
                    {
                        columns.Add(dataColumn);
                    }
                }
            }
        }
        catch (Exception)
        {
            // Fallback: empty list if GetDataColumns fails
        }

        return columns;
    }

    private object? GetCellValue(DxGridDataColumn column)
    {
        if (_currentDataItem == null || string.IsNullOrWhiteSpace(column.FieldName))
            return null;

        try
        {
            var fieldName = column.FieldName;
            var properties = fieldName.Split('.');
            object? currentValue = _currentDataItem;

            foreach (var propertyName in properties)
            {
                if (currentValue == null)
                    break;

                var propertyInfo = currentValue.GetType().GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);
                if (propertyInfo == null)
                    return null;

                currentValue = propertyInfo.GetValue(currentValue);
            }

            return currentValue;
        }
        catch
        {
            return null;
        }
    }

    private string GetDisplayText(DxGridDataColumn column, object? value)
    {
        if (value == null)
            return string.Empty;

        if (value is DateTime dateTime)
        {
            return dateTime.ToString("yyyy-MM-dd HH:mm:ss");
        }

        if (value is bool boolValue)
        {
            return boolValue ? "Igen" : "Nem";
        }

        if (value is decimal || value is double || value is float)
        {
            return string.Format("{0:N2}", value);
        }

        if (value is int || value is long || value is short || value is byte)
        {
            return string.Format("{0:N0}", value);
        }

        return value.ToString() ?? string.Empty;
    }
}