using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using GenesisCordonelInterface.API;
using static GenesisCordonelInterface.API.PublicModels;

namespace GenesisCordonelInterface.UI.Debug
{
    public partial class MeterBatchConfigPanel : UserControl
    {
        private readonly InterfaceOutsideToGCI api;

        private bool isRefreshing;
        private List<string> comPorts = new List<string>();

        public MeterBatchConfigPanel(InterfaceOutsideToGCI api)
        {
            this.api = api;

            InitializeComponent();

            RefreshComPorts();
            InitializeGridColumns();

            api.MeterBatchStatusChanged += Api_MeterBatchStatusChanged;

            UpdateGrid(api.GetMeterBatchDebugStatuses());
        }

        #region INIT
        // ----------------------------------------------------

        private void InitializeGridColumns()
        {
            grid.Columns.Clear();

            grid.Columns.Add("Slot", "Slot");
            grid.Columns.Add(new DataGridViewCheckBoxColumn { Name = "Selected", HeaderText = "Selected" });
            grid.Columns.Add("PcbId", "PcbId");
            grid.Columns.Add(new DataGridViewCheckBoxColumn { Name = "IsLoggedOn", HeaderText = "IsLoggedOn" });

            grid.Columns.Add(CreateComPortColumn("RequestPort", "RequestPort"));
            grid.Columns.Add(CreateComPortColumn("StreamingPort", "StreamingPort"));

            grid.Columns.Add(CreateButtonColumn("DetectRequest", "DetectRequest", "..."));
            grid.Columns.Add(CreateButtonColumn("DetectStreaming", "DetectStreaming", "..."));

            grid.Columns.Add("FwVersion", "FwVersion");
            grid.Columns.Add("InterfaceVersion", "InterfaceVersion");

            foreach (DataGridViewColumn col in grid.Columns)
            {
                col.ReadOnly =
                    col.Name != "Selected" &&
                    col.Name != "RequestPort" &&
                    col.Name != "StreamingPort" &&
                    col.Name != "DetectRequest" &&
                    col.Name != "DetectStreaming";
            }

            EnableDoubleBuffering(grid);
        }

        private DataGridViewComboBoxColumn CreateComPortColumn(string name, string headerText)
        {
            return new DataGridViewComboBoxColumn
            {
                Name = name,
                HeaderText = headerText,
                DataSource = new List<string>(comPorts),
                FlatStyle = FlatStyle.Flat,
                DisplayStyle = DataGridViewComboBoxDisplayStyle.DropDownButton
            };
        }

        private DataGridViewButtonColumn CreateButtonColumn(string name, string headerText, string text)
        {
            return new DataGridViewButtonColumn
            {
                Name = name,
                HeaderText = headerText,
                Text = text,
                UseColumnTextForButtonValue = true
            };
        }

        private void RefreshComPorts()
        {
            comPorts = SerialPort.GetPortNames()
                .OrderBy(NaturalComPortOrder)
                .ToList();

            if (!comPorts.Contains(""))
                comPorts.Insert(0, "");
        }

        // ----------------------------------------------------
        #endregion

        #region REFRESH EVENT DRIVEN
        // ----------------------------------------------------

        private void Api_MeterBatchStatusChanged(
            List<MeterBatchDebugStatus> data)
        {
            if (IsDisposed)
                return;

            if (InvokeRequired)
            {
                BeginInvoke(new Action(() => UpdateGrid(data)));
                return;
            }

            UpdateGrid(data);
        }

        private void UpdateGrid(List<MeterBatchDebugStatus> data)
        {
            isRefreshing = true;

            foreach (var meter in data)
            {
                EnsurePortValueExists(meter.RequestPort);
                EnsurePortValueExists(meter.StreamingPort);

                var row = FindOrCreateRow(meter.Slot);

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

            isRefreshing = false;
        }

        // ----------------------------------------------------
        #endregion

        #region COM PORT HELPERS
        // ----------------------------------------------------

        private void UpdateComPortColumnItems(string columnName)
        {
            var col = grid.Columns[columnName] as DataGridViewComboBoxColumn;
            if (col == null)
                return;

            col.DataSource = null;
            col.DataSource = new List<string>(comPorts);
        }

        private void EnsurePortValueExists(string port)
        {
            if (string.IsNullOrWhiteSpace(port))
                return;

            if (comPorts.Contains(port))
                return;

            comPorts.Add(port);
            comPorts = comPorts.OrderBy(NaturalComPortOrder).ToList();

            if (!comPorts.Contains(""))
                comPorts.Insert(0, "");

            UpdateComPortColumnItems("RequestPort");
            UpdateComPortColumnItems("StreamingPort");
        }

        private static int NaturalComPortOrder(string port)
        {
            if (string.IsNullOrWhiteSpace(port))
                return 0;

            string number = new string(port.Where(char.IsDigit).ToArray());

            int parsed;
            if (int.TryParse(number, out parsed))
                return parsed;

            return int.MaxValue;
        }

        // ----------------------------------------------------
        #endregion

        #region GRID HELPERS
        // ----------------------------------------------------

        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 Set(DataGridViewRow row, string col, object value)
        {
            if (!grid.Columns.Contains(col))
                return;

            if (value == null)
                value = "";

            var cell = row.Cells[col];

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

        // ----------------------------------------------------
        #endregion

        #region USER EDIT
        // ----------------------------------------------------

        private void grid_CurrentCellDirtyStateChanged(object sender, EventArgs e)
        {
            if (grid.IsCurrentCellDirty)
                grid.CommitEdit(DataGridViewDataErrorContexts.Commit);
        }

        private void grid_CellValueChanged(object sender, DataGridViewCellEventArgs e)
        {
            if (isRefreshing)
                return;

            if (e.RowIndex < 0)
                return;

            string columnName = grid.Columns[e.ColumnIndex].Name;

            if (columnName != "Selected" &&
                columnName != "RequestPort" &&
                columnName != "StreamingPort")
                return;

            int slot = Convert.ToInt32(grid.Rows[e.RowIndex].Cells["Slot"].Value);

            if (columnName == "Selected")
            {
                bool selected = Convert.ToBoolean(grid.Rows[e.RowIndex].Cells["Selected"].Value);
                api.SetSlotSelected(slot, selected);
                return;
            }

            string port = Convert.ToString(grid.Rows[e.RowIndex].Cells[columnName].Value);

            if (columnName == "RequestPort")
            {
                //api.SetSlotRequestPort(slot, port);
                return;
            }

            if (columnName == "StreamingPort")
            {
                //api.SetSlotStreamingPort(slot, port);
                return;
            }
        }

        private async void grid_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.RowIndex < 0)
                return;

            string columnName = grid.Columns[e.ColumnIndex].Name;

            if (columnName != "DetectRequest" &&
                columnName != "DetectStreaming")
                return;

            int slot = Convert.ToInt32(grid.Rows[e.RowIndex].Cells["Slot"].Value);

            if (columnName == "DetectRequest")
            {
                await DetectRequestPortAsync(slot);
                return;
            }

            if (columnName == "DetectStreaming")
            {
                await DetectStreamingPortAsync(slot);
                return;
            }
        }

        private async Task DetectRequestPortAsync(int slot)
        {
            try
            {
                grid.Enabled = false;
                await api.DetectRequestPortAsync(slot);
                api.RaiseMeterBatchStatusChanged();
            }
            finally
            {
                grid.Enabled = true;
            }
        }

        private async Task DetectStreamingPortAsync(int slot)
        {
            try
            {
                grid.Enabled = false;
                await api.DetectStreamingPortAsync(slot);
                api.RaiseMeterBatchStatusChanged();
            }
            finally
            {
                grid.Enabled = true;
            }
        }

        private void grid_DataError(object sender, DataGridViewDataErrorEventArgs e)
        {
            e.ThrowException = false;
        }

        // ----------------------------------------------------
        #endregion

        #region PERFORMANCE
        // ----------------------------------------------------

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

        // ----------------------------------------------------
        #endregion

        public void AddEmptySlotRow()
        {
            int nextSlot = 1;

            var existing = grid.Rows
                .Cast<DataGridViewRow>()
                .Where(r => r.Cells["Slot"].Value != null)
                .Select(r => Convert.ToInt32(r.Cells["Slot"].Value))
                .ToList();

            if (existing.Count > 0)
                nextSlot = existing.Max() + 1;

            int idx = grid.Rows.Add();
            var row = grid.Rows[idx];

            row.Cells["Slot"].Value = nextSlot;
            row.Cells["Selected"].Value = true;
            row.Cells["RequestPort"].Value = "";
            row.Cells["StreamingPort"].Value = "";
        }

        public List<MeterBatchDebugStatus> GetGridData()
        {
            var list = new List<MeterBatchDebugStatus>();

            foreach (DataGridViewRow row in grid.Rows)
            {
                if (row.Cells["Slot"].Value == null)
                    continue;

                list.Add(new MeterBatchDebugStatus
                {
                    Slot = Convert.ToInt32(row.Cells["Slot"].Value),
                    Selected = Convert.ToBoolean(row.Cells["Selected"].Value),
                    RequestPort = Convert.ToString(row.Cells["RequestPort"].Value),
                    StreamingPort = Convert.ToString(row.Cells["StreamingPort"].Value)
                });
            }

            return list;
        }
    }
}