using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using InABox.Core;
using InABox.DynamicGrid;
using InABox.Scripting;
using InABox.WPF;
using Microsoft.Win32;
using Org.BouncyCastle.Asn1.Mozilla;
using Syncfusion.UI.Xaml.Spreadsheet;
using Syncfusion.Windows.Shared;
using UnderlineType = InABox.Core.UnderlineType;

namespace InABox.DynamicGrid
{

    public static class FormLayoutImporter
    {
        private class Cell
        {
            public string Content { get; set; }

            public int Row { get; set; }

            public int Column { get; set; }

            public int RowSpan { get; set; } = 1;

            public int ColumnSpan { get; set; } = 1;

            public ICell InnerCell { get; set; }

            public Cell(int row, int column, string content, ICell cell)
            {
                Row = row;
                Column = column;
                Content = content;
                InnerCell = cell;
            }
        }

        private static void DeleteColumn(List<Cell> cells, int column)
        {
            foreach(var cell in cells)
            {
                if(cell.Column <= column && cell.Column + cell.ColumnSpan - 1 >= column)
                {
                    --cell.ColumnSpan;
                }
                else if(cell.Column > column)
                {
                    --cell.Column;
                }
            }
            cells.RemoveAll(x => x.ColumnSpan < 0);
        }

        private static List<Cell> GetCells(ISheet sheet)
        {
            var grid = new Dictionary<int, Dictionary<int, Cell>>();

            for (int rowIdx = sheet.FirstRow; rowIdx <= sheet.LastRow; ++rowIdx)
            {
                var row = sheet.GetRow(rowIdx);
                if (row is not null && row.FirstColumn >= 0)
                {
                    var rowCells = new Dictionary<int, Cell>();
                    for (int colIdx = row.FirstColumn; colIdx <= row.LastColumn; ++colIdx)
                    {
                        var cell = row.GetCell(colIdx);
                        if (cell is not null)
                        {
                            rowCells.Add(colIdx, new Cell(rowIdx, colIdx, cell.GetValue(), cell));
                        }
                    }
                    grid.Add(rowIdx, rowCells);
                }
            }

            foreach (var region in sheet.GetMergedCells())
            {
                for (int r = region.FirstRow; r <= region.LastRow; ++r)
                {
                    if (!grid.TryGetValue(r, out var row)) continue;

                    for (int c = region.FirstColumn; c <= region.LastColumn; ++c)
                    {
                        if ((r - region.FirstRow) + (c - region.FirstColumn) != 0)
                        {
                            row.Remove(c);
                        }
                    }
                    if (row.Count == 0)
                    {
                        grid.Remove(r);
                    }
                }

                if (grid.TryGetValue(region.FirstRow, out var cRow) && cRow.TryGetValue(region.FirstColumn, out var cCell))
                {
                    cCell.RowSpan = region.LastRow - region.FirstRow + 1;
                    cCell.ColumnSpan = region.LastColumn - region.FirstColumn + 1;
                }
            }

            var cells = new List<Cell>();
            foreach (var row in grid.Values)
            {
                foreach (var cell in row.Values)
                {
                    cells.Add(cell);
                }
            }
            return cells;
        }

        public static DFLayout LoadLayout(ISpreadsheet spreadsheet)
        {
            var sheet = spreadsheet.GetSheet(0);

            var cells = GetCells(sheet);

            int firstRow = int.MaxValue;
            int lastRow = 0;
            int firstCol = int.MaxValue;
            int lastCol = 0;

            foreach (var cell in cells)
            {
                firstCol = Math.Min(cell.Column, firstCol);
                lastCol = Math.Max(cell.Column + cell.ColumnSpan - 1, lastCol);

                firstRow = Math.Min(cell.Row, firstRow);
                lastRow = Math.Max(cell.Row + cell.RowSpan - 1, lastRow);
            }

            var layout = new DFLayout();

            var columnWidths = new Dictionary<int, float>();
            var colOffset = 0;
            for (int col = firstCol; col <= lastCol; ++col)
            {
                var width = sheet.GetColumnWidth(col);
                if(width == float.MinValue)
                {
                    layout.ColumnWidths.Add("10*");
                }
                else if(width <= 0f)
                {
                    DeleteColumn(cells, col);
                }
                else
                {
                    layout.ColumnWidths.Add($"{width}*");
                }
            }

            /*var rowHeights = new Dictionary<int, float>();
            for (int row = firstRow; row <= lastRow; ++row)
            {
                rowHeights[row] = sheet.GetRowHeight(row);
            }
            var totalHeight = rowHeights.Values.Sum();*/

            for(int row = firstRow; row <= lastRow; ++row)
            {
                layout.RowHeights.Add("Auto");
            }

            foreach(var cell in cells)
            {
                var style = cell.InnerCell.GetStyle();

                if (string.IsNullOrWhiteSpace(cell.Content) && style.Foreground == Color.Empty) continue;

                var font = style.Font;

                layout.Elements.Add(new DFLayoutLabel
                {
                    Caption = cell.Content,
                    Row = cell.Row - firstRow + 1,
                    Column = cell.Column - firstCol + 1 - colOffset,
                    RowSpan = cell.RowSpan,
                    ColumnSpan = cell.ColumnSpan,

                    Style = new DFLayoutTextStyle
                    {
                        FontSize = font.FontSize,

                        IsItalic = font.Italic,
                        IsBold = font.Bold,
                        Underline = font.Underline switch
                        {
                            Scripting.UnderlineType.None => UnderlineType.None,
                            Scripting.UnderlineType.Single or Scripting.UnderlineType.SingleAccounting => UnderlineType.Single,
                            Scripting.UnderlineType.Double or Scripting.UnderlineType.DoubleAccounting => UnderlineType.Double,
                            _ => UnderlineType.None
                        },
                        BackgroundColour = style.Foreground,
                        ForegroundColour = font.Colour
                    }
                });
            }

            return layout;
        }
    }

    public abstract class DynamicFormLayoutGrid<T> : DynamicOneToManyGrid<DigitalForm, DigitalFormLayout> where T : Entity, IRemotable, IPersistent, new()
    {
        private readonly BitmapImage design = Properties.Resources.design.AsBitmapImage();

        public DynamicFormLayoutGrid()
        {
            Options.AddRange(DynamicGridOption.RecordCount, DynamicGridOption.ImportData);
            ActionColumns.Add(new DynamicImageColumn(DesignImage, DesignClick));
            //AddButton("Design", PRSDesktop.Resources.design.AsBitmapImage(), DesignClick);
            HiddenColumns.Add(x => x.Layout);

            AddButton("Auto Generate", null, AutoGenerate_Click);
            AddButton("Duplicate", null, Duplicate_Click);
        }

        private DFLayout LoadLayoutFromSpreadsheet(ISpreadsheet spreadsheet)
        {
            return FormLayoutImporter.LoadLayout(spreadsheet);
        }

        protected override void DoImport()
        {
            var dialog = new OpenFileDialog();
            dialog.Filter = "Excel Spreadsheet (.xlsx)|*.xlsx";
            if (dialog.ShowDialog() == true)
            {
                try
                {
                    DFLayout layout;
                    using (var fs = new FileStream(dialog.FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
                    {
                        layout = LoadLayoutFromSpreadsheet(new Spreadsheet(fs));
                    }

                    var dfLayout = CreateItem();
                    dfLayout.Layout = layout.SaveLayout();
                    if(EditItems(new DigitalFormLayout[] { dfLayout }))
                    {
                        Refresh(false, true);
                    }
                }
                catch(Exception e)
                {
                    Logger.Send(LogType.Error, "", CoreUtils.FormatException(e));
                    MessageBox.Show($"Error: {e.Message}");
                }
            }
        }

        private bool Duplicate_Click(Button btn, CoreRow[] rows)
        {
            if (!rows.Any()) return false;

            SaveItems(rows.Select(x =>
            {
                var layout = x.ToObject<DigitalFormLayout>();
                layout.ID = Guid.Empty;
                return layout;
            }).ToArray());
            return true;
        }

        private bool AutoGenerate_Click(Button btn, CoreRow[] rows)
        {
            var menu = new ContextMenu();

            menu.AddItem("Desktop Layout", null, AddDesktop_Click);
            menu.AddItem("Mobile Layout", null, AddMobile_Click);

            menu.IsOpen = true;

            return false;
        }

        private BitmapImage? DesignImage(CoreRow? row)
        {
            return row != null ? design : null;
        }

        private void AddMobile_Click()
        {
            var item = CreateItem();

            item.Layout = DFLayout.GenerateAutoMobileLayout(GetVariables()).SaveLayout();
            item.Type = DFLayoutType.Mobile;

            if (EditItems(new[] { item }))
            {
                SaveItem(item);
                Refresh(false, true);
                OnChanged?.Invoke(this);
            }
        }

        private void AddDesktop_Click()
        {
            var item = CreateItem();

            item.Layout = DFLayout.GenerateAutoDesktopLayout(GetVariables()).SaveLayout();
            item.Type = DFLayoutType.Desktop;

            if (EditItems(new[] { item }))
            {
                SaveItem(item);
                Refresh(false, true);
                OnChanged?.Invoke(this);
            }
        }

        private DynamicOneToManyGrid<DigitalForm, DigitalFormVariable>? GetVariableGrid()
            => EditorGrid.Pages?.FirstOrDefault(x => x is DynamicOneToManyGrid<DigitalForm, DigitalFormVariable>)
                as DynamicOneToManyGrid<DigitalForm, DigitalFormVariable>;

        private List<DigitalFormVariable> GetVariables()
            => GetVariableGrid()?.Items.ToList() ?? new List<DigitalFormVariable>();

        private void Design(DigitalFormLayout layout)
        {
            var variables = GetVariables();

            var newVariables = new List<DigitalFormVariable>();

            var form = new DynamicFormDesignWindow
            {
                Type = layout.Type
            };
            form.OnCreateVariable += (fieldType) =>
            {
                if (DynamicVariableUtils.CreateAndEdit(Item, GetVariables(), fieldType, out var variable))
                {
                    newVariables.Add(variable);
                    return variable;
                }
                return null;
            };
            /*form.OnEditVariable += (variable) =>
            {
                var properties = variable.CreateProperties();
                if (DynamicVariableUtils.EditProperties(Item, GetVariables(), properties.GetType(), properties))
                {
                    variable.SaveProperties(properties);
                    return true;
                }
                return false;
            };*/
            form.LoadLayout(layout, variables);
            form.Initialize();

            if (form.ShowDialog() == true)
            {
                layout.Layout = form.SaveLayout();
                SaveItem(layout);

                var grid = GetVariableGrid();
                if (grid is not null)
                {
                    grid.SaveItems(newVariables.ToArray());
                    grid.Refresh(false, true);
                }
            }
        }

        private bool DesignClick(CoreRow? row)
        {
            if (row == null)
                return false;

            Design(LoadItem(row));

            return false;
        }


        //public override void SaveItem(DigitalFormLayout item)
        //{
        //    bool bActive = item.Active;
        //    foreach (var other in Items.Where(x=>(x != item) && (x.Type == item.Type)))
        //    {
        //        if (item.Active)
        //        {
        //            if (other.Active)
        //                other.Active = false;
        //        }
        //        else
        //            bActive = bActive || other.Active;
        //    }
        //    if (!bActive)
        //        item.Active = true;
        //    base.SaveItem(item);
        //}

        protected override void DoDoubleClick(object sender)
        {
            DesignClick(SelectedRows.FirstOrDefault());
        }
    }
}