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using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using XenAdmin.Controls.DataGridViewEx;
using XenAPI;
using XenAdmin.Dialogs;
using XenAdmin.Actions.GPU;


namespace XenAdmin.Controls.GPU
{
    public partial class GpuConfiguration : XenDialogBase
    {
        private List<PGPU> PGpuList { get; }

        internal override string HelpName => "GpuConfigurationDialog";

        private GpuConfiguration()
        {
            InitializeComponent();
        }

        public GpuConfiguration(List<PGPU> pGpuList)
            : base(pGpuList[0].Connection)
        {
            InitializeComponent();

            PGpuList = pGpuList.ToList();
            PopulateGrid(pGpuList);
        }

        protected override void OnShown(EventArgs e)
        {
            base.OnShown(e);
            SetWindowTitle();
        }

        private void PopulateGrid(IEnumerable<PGPU> pGpuList)
        {
            var pGpu = PGpuList[0];

            dataGridViewEx1.SuspendLayout();
            dataGridViewEx1.Rows.Clear();
            dataGridViewEx1.Cursor = Cursors.WaitCursor;
            try
            {
                if (pGpu.supported_VGPU_types != null)
                {
                    var rows = from supportedVGpuTypeRef in pGpu.supported_VGPU_types
                        let supportedVGpuType = pGpu.Connection.Resolve(supportedVGpuTypeRef)
                        let enabled = pGpu.enabled_VGPU_types.Contains(supportedVGpuTypeRef)
                        let isInUse = pGpuList.Any(p => p.Connection.ResolveAll(p.resident_VGPUs).Any(v => v.type.opaque_ref == supportedVGpuTypeRef.opaque_ref))
                        orderby supportedVGpuType descending
                        select new VGpuDetailWithCheckBoxRow(supportedVGpuTypeRef, supportedVGpuType, enabled, isInUse);

                    dataGridViewEx1.Rows.AddRange(rows.Cast<DataGridViewRow>().ToArray());
                }
            }
            finally
            {
                dataGridViewEx1.ResumeLayout();
                dataGridViewEx1.Cursor = Cursors.Default;
            }
        }

        private void okButton_Click(object sender, System.EventArgs e)
        {
            var updatedEnabledVGpuListByPGpu = new Dictionary<PGPU, List<XenRef<VGPU_type>>>();
            PGpuList.ForEach(pgpu => updatedEnabledVGpuListByPGpu.Add(pgpu, new List<XenRef<VGPU_type>>(pgpu.enabled_VGPU_types)));
            var changes = dataGridViewEx1.Rows.Cast<VGpuDetailWithCheckBoxRow>().ToList().FindAll(r => r.NeedsSave);
            if (changes.Count > 0)
            {
                changes.ForEach(r => updatedEnabledVGpuListByPGpu.Keys.ToList()
                                               .ForEach(pGpu =>
                                                            {
                                                                var vGpuList = updatedEnabledVGpuListByPGpu[pGpu];
                                                                if (vGpuList.Contains(r.VGpuTypeRef) && !r.CheckBoxChecked)
                                                                    vGpuList.Remove(r.VGpuTypeRef);
                                                                else if (r.CheckBoxChecked)
                                                                    vGpuList.Add(r.VGpuTypeRef);
                                                            }));

                new VgpuConfigurationAction(updatedEnabledVGpuListByPGpu, connection).RunAsync();
            }
            Close();
        }

        private void dataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            if (e.ColumnIndex != CheckBoxColumn.Index || e.RowIndex < 0 || e.RowIndex >= dataGridViewEx1.RowCount)
                return;

            if (dataGridViewEx1.Rows[e.RowIndex] is VGpuDetailWithCheckBoxRow row && row.Enabled &&
                row.Cells[e.ColumnIndex] is DataGridViewCheckBoxCell clickedCell)
                clickedCell.Value = !(bool)clickedCell.Value;
        }

        private void SetWindowTitle()
        {
            var name = PGpuList[0].Name();
            Text = PGpuList.Count == 1
                ? String.Format(Messages.GPU_GROUP_NAME_AND_NO_OF_GPUS_ONE, name)
                : String.Format(Messages.GPU_GROUP_NAME_AND_NO_OF_GPUS, name, PGpuList.Count);

            rubricLabel.Text = PGpuList.Count == 1
                ? Messages.GPU_RUBRIC_PLEASE_SELECT_WHICH_GPU_ONE
                : Messages.GPU_RUBRIC_PLEASE_SELECT_WHICH_GPU_MULTIPLE;
        }
    }

    class VGpuDetailWithCheckBoxRow : DataGridViewExRow
    {
        private readonly bool allowed;
        private readonly bool isInUse;

        private readonly DataGridViewCheckBoxCell checkBoxCell = new DataGridViewCheckBoxCell()
        {
            ThreeState = false,
            TrueValue = true,
            FalseValue = false,
            ValueType = typeof(bool)
        };
        private readonly DataGridViewTextBoxCell nameColumn = new DataGridViewTextBoxCell();
        private readonly DataGridViewTextBoxCell vGpusPerGpuColumn = new DataGridViewTextBoxCell();
        private readonly DataGridViewTextBoxCell videoRamColumn = new DataGridViewTextBoxCell();

        public VGPU_type VGpuType { get; }
        public XenRef<VGPU_type> VGpuTypeRef { get; }

        public bool NeedsSave => allowed != CheckBoxChecked;
        public bool CheckBoxChecked => (bool)checkBoxCell.Value;

        public VGpuDetailWithCheckBoxRow(XenRef<VGPU_type> vGpuTypeRef, VGPU_type vGpuType, bool allowed, bool isInUse)
        {
            VGpuTypeRef = vGpuTypeRef;
            VGpuType = vGpuType;
            this.allowed = allowed;
            this.isInUse = isInUse;

            Cells.AddRange(checkBoxCell, nameColumn, vGpusPerGpuColumn, videoRamColumn);
            SetCells();
        }

        private void SetCells()
        {
            checkBoxCell.Value = allowed;

            bool isPassThru = VGpuType.IsPassthrough();

            nameColumn.Value = isPassThru ? Messages.VGPU_PASSTHRU_TOSTRING : VGpuType.model_name;

            if (!isPassThru)
                vGpusPerGpuColumn.Value = VGpuType.Capacity();
            else
                vGpusPerGpuColumn.Value = string.Empty;

            videoRamColumn.Value = VGpuType.framebuffer_size != 0 ? Util.MemorySizeStringSuitableUnits(VGpuType.framebuffer_size, true) : string.Empty;
        }

        protected override void OnDataGridViewChanged()
        {
            base.OnDataGridViewChanged();

            if (DataGridView != null && isInUse && allowed)
                Enabled = false;
        }
    }
}