using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Windows.Forms;

namespace GenesisCordonelInterface.UI.Grid
{
    public class MeterGridManager
    {
        private readonly DataGridView grid;

        public MeterGridManager(DataGridView grid)
        {
            this.grid = grid;
            EnableDoubleBuffering(grid);
        }

        public void Init(List<MeterGridColumnConfig> columns)
        {
            grid.SuspendLayout();

            grid.AutoGenerateColumns = false;
            grid.Columns.Clear();

            grid.AllowUserToAddRows = false;
            grid.AllowUserToDeleteRows = false;
            grid.RowHeadersVisible = true;

            foreach (var cfg in columns.OrderBy(c => c.DisplayIndex))
            {
                DataGridViewColumn col;

                if (cfg.Name == "Selected" || cfg.Name == "IsLoggedOn")
                    col = new DataGridViewCheckBoxColumn();
                else
                    col = new DataGridViewTextBoxColumn();

                col.Name = cfg.Name;
                col.HeaderText = cfg.HeaderText;
                col.Visible = cfg.Visible;
                col.Width = cfg.Width;
                col.ReadOnly = cfg.ReadOnly;

                grid.Columns.Add(col);
            }

            grid.ResumeLayout();
        }

        public void Update(List<MeterRowDto> meters)
        {
            grid.SuspendLayout();

            foreach (var meter in meters)
            {
                var row = FindOrCreateRow(meter.Slot);

                SetCell(row, "Slot", meter.Slot);
                SetCell(row, "Selected", meter.Selected);
                SetCell(row, "PcbId", meter.PcbId);
                SetCell(row, "IsConnected", meter.IsConnected);
                SetCell(row, "IsLoggedOn", meter.IsLoggedOn);
                SetCell(row, "RequestPort", meter.RequestPort);
                SetCell(row, "StreamingPort", meter.StreamingPort);
                SetCell(row, "FwVersion", meter.FwVersion);
                SetCell(row, "InterfaceVersion", meter.InterfaceVersion);
            }

            grid.ResumeLayout();
        }

        private DataGridViewRow FindOrCreateRow(int slot)
        {
            foreach (DataGridViewRow row in grid.Rows)
            {
                if (row.Cells["Slot"].Value != null &&
                    Convert.ToInt32(row.Cells["Slot"].Value) == slot)
                {
                    return row;
                }
            }

            int idx = grid.Rows.Add();
            var newRow = grid.Rows[idx];
            newRow.Cells["Slot"].Value = slot;
            return newRow;
        }

        private void SetCell(DataGridViewRow row, string colName, object value)
        {
            if (!grid.Columns.Contains(colName))
                return;

            var cell = row.Cells[colName];

            if (!Equals(cell.Value, value))
                cell.Value = value;
        }

        private void EnableDoubleBuffering(DataGridView dgv)
        {
            typeof(DataGridView)
                .GetProperty("DoubleBuffered", BindingFlags.Instance | BindingFlags.NonPublic)
                ?.SetValue(dgv, true, null);
        }
    }
}