using System;
#if __MACOS__
using Syncfusion.Drawing;
#else
using System.Drawing;
#endif
using System.Linq;
using Syncfusion.DocIO.DLS;
using Vinno.IUS.Common.Log;
using Vinno.vCloud.Report.Interfaces;
using Vinno.vCloud.Report.Models;
using PageNumberStyle = Syncfusion.DocIO.DLS.PageNumberStyle;

namespace Vinno.vCloud.ReportGenerator
{
    public class ReportWordDocument : WordDocument, IReportWordDocument
    {
    }

    public class ReportWordDocumentManager
    {
        private static bool _showImageIndex;

        private static float _widthZoomRatio;

        /// <summary>
        /// gets word document from report info
        /// </summary>
        /// <param name="reportInfo"></param>
        /// <returns></returns>
        public static IReportWordDocument GetGenerateWordDocument(ReportInfo reportInfo)
        {
            _widthZoomRatio = 1;
            var wordDocument = new ReportWordDocument();
            try
            {
                if (reportInfo == null)
                {
                    return null;
                }
                _showImageIndex = reportInfo.ElementValues != null && reportInfo.ElementValues.ContainsKey(ElementTag.AIIndexFlag);
                reportInfo = reportInfo.Clone();//bcs may del table row or change HeaderDistance/HeaderHeight
                var reportTemplate = reportInfo.Template;
                var headerVisible = reportTemplate.Header.Any(x => x.IsVisibleIn(reportInfo));
                if (!headerVisible)
                    reportInfo.Template.HeaderDistance = 0;

                var footerVisible = reportTemplate.Footer.Any(x => x.IsVisibleIn(reportInfo));
                if (!footerVisible)
                    reportInfo.Template.FooterDistance = 0;

                if (reportTemplate.InvertColor)
                {
                    wordDocument.Background.Type = BackgroundType.Color;
                    wordDocument.Background.Color = Color.Black;
                }

                wordDocument.FontSettings.SubstituteFont += OnSubstituteFont;
                var section = wordDocument.AddSection();
                SetPageSetting(reportTemplate.PageSize, reportTemplate.PagePadding, section);

                if (reportTemplate.Header.Count > 0)
                {
                    if (reportTemplate.HeaderHeight == null)
                    {
                        foreach (var blockElement in reportTemplate.Header)
                        {
                            AddBlock(reportInfo, blockElement, section.HeadersFooters.Header, wordDocument);
                        }
                    }
                    else
                    {
                        var table = section.HeadersFooters.Header.AddTable();
                        InitTable(table);
                        var cell = table.Rows[0].Cells[0];
                        foreach (var blockElement in reportTemplate.Header)
                        {
                            AddBlock(reportInfo, blockElement, cell, wordDocument);
                        }

                        //bcs may del table row in AddBlock
                        table.Rows[0].Height = (float)reportTemplate.HeaderHeight - 5;
                    }
                }

                foreach (var blockElement in reportTemplate.Blocks)
                {
                    AddBlock(reportInfo, blockElement, section.Body, wordDocument);
                }

                if (reportTemplate.Footer.Count > 0)
                {
                    if (reportTemplate.FooterHeight == null)
                    {
                        foreach (var blockElement in reportTemplate.Footer)
                        {
                            AddBlock(reportInfo, blockElement, section.HeadersFooters.Footer, wordDocument);
                        }
                    }
                    else
                    {
                        var table = section.HeadersFooters.Footer.AddTable();
                        InitTable(table);
                        table.Rows[0].Height = (float)reportTemplate.FooterHeight - 5;
                        var cell = table.Rows[0].Cells[0];
                        foreach (var blockElement in reportTemplate.Footer)
                        {
                            AddBlock(reportInfo, blockElement, cell, wordDocument);
                        }
                    }
                }

                var pageNumberElement = reportTemplate.Footer.SelectMany(f => f.Elements)
                    .FirstOrDefault(e => e is PageNumberElement) as PageNumberElement;
                if (pageNumberElement != null)
                {
                    section.PageSetup.RestartPageNumbering = true;
                    section.PageSetup.PageStartingNumber = 1;
                    section.PageSetup.PageNumberStyle = PageNumberStyle.Arabic;
                }

                foreach (WSection wSection in wordDocument.Sections)
                {
                    wSection.PageSetup.HeaderDistance = (float)reportInfo.Template.HeaderDistance;
                    if (!headerVisible)
                    {
                        wSection.HeadersFooters.Header.ChildEntities.Clear();
                    }

                    wSection.PageSetup.FooterDistance = (float)reportInfo.Template.FooterDistance;
                    if (!footerVisible)
                    {
                        wSection.HeadersFooters.Footer.ChildEntities.Clear();
                    }

                    var endParagraph = wSection.AddParagraph();//hide blank page/paragraph after last table
                    endParagraph.BreakCharacterFormat.FontSize = 0;
                }
            }
            catch (Exception e)
            {
                Logger.WriteLineError($"Generate word document error {e}");
            }

            return wordDocument;
        }

        public static IReportWordDocument GetGenerateWordDocumentAdaptPageSetting(ReportInfo reportInfo, RTPageSize pageSize, RTThickness pagePadding)
        {
            var wordDocument = new ReportWordDocument();
            try
            {
                if (reportInfo == null)
                {
                    return null;
                }
               
                _showImageIndex = reportInfo.ElementValues != null && reportInfo.ElementValues.ContainsKey(ElementTag.AIIndexFlag);
                reportInfo = reportInfo.Clone();//bcs may del table row or change HeaderDistance/HeaderHeight
                var reportTemplate = reportInfo.Template;
                _widthZoomRatio = (float)Math.Round((pageSize.Width-pagePadding.Left-pagePadding.Right) / (reportTemplate.PageSize.Width-reportTemplate.PagePadding.Left-reportTemplate.PagePadding.Right), 3);
               var headerVisible = reportTemplate.Header.Any(x => x.IsVisibleIn(reportInfo));
                if (!headerVisible)
                    reportInfo.Template.HeaderDistance = 0;

                var footerVisible = reportTemplate.Footer.Any(x => x.IsVisibleIn(reportInfo));
                if (!footerVisible)
                    reportInfo.Template.FooterDistance = 0;

                if (reportTemplate.InvertColor)
                {
                    wordDocument.Background.Type = BackgroundType.Color;
                    wordDocument.Background.Color = Color.Black;
                }

                wordDocument.FontSettings.SubstituteFont += OnSubstituteFont;
                var section = wordDocument.AddSection();
                SetPageSetting(pageSize, pagePadding, section);

                if (reportTemplate.Header.Count > 0)
                {
                    if (reportTemplate.HeaderHeight == null)
                    {
                        foreach (var blockElement in reportTemplate.Header)
                        {
                            AddBlock(reportInfo, blockElement, section.HeadersFooters.Header, wordDocument);
                        }
                    }
                    else
                    {
                        var table = section.HeadersFooters.Header.AddTable();
                        InitTable(table);
                        var cell = table.Rows[0].Cells[0];
                        foreach (var blockElement in reportTemplate.Header)
                        {
                            AddBlock(reportInfo, blockElement, cell, wordDocument);
                        }

                        //bcs may del table row in AddBlock
                        table.Rows[0].Height = (float)reportTemplate.HeaderHeight - 5;
                    }
                }

                foreach (var blockElement in reportTemplate.Blocks)
                {
                    AddBlock(reportInfo, blockElement, section.Body, wordDocument);
                }

                if (reportTemplate.Footer.Count > 0)
                {
                    if (reportTemplate.FooterHeight == null)
                    {
                        foreach (var blockElement in reportTemplate.Footer)
                        {
                            AddBlock(reportInfo, blockElement, section.HeadersFooters.Footer, wordDocument);
                        }
                    }
                    else
                    {
                        var table = section.HeadersFooters.Footer.AddTable();
                        InitTable(table);
                        table.Rows[0].Height = (float)reportTemplate.FooterHeight - 5;
                        var cell = table.Rows[0].Cells[0];
                        foreach (var blockElement in reportTemplate.Footer)
                        {
                            AddBlock(reportInfo, blockElement, cell, wordDocument);
                        }
                    }
                }

                var pageNumberElement = reportTemplate.Footer.SelectMany(f => f.Elements)
                    .FirstOrDefault(e => e is PageNumberElement) as PageNumberElement;
                if (pageNumberElement != null)
                {
                    section.PageSetup.RestartPageNumbering = true;
                    section.PageSetup.PageStartingNumber = 1;
                    section.PageSetup.PageNumberStyle = PageNumberStyle.Arabic;
                }

                foreach (WSection wSection in wordDocument.Sections)
                {
                    wSection.PageSetup.HeaderDistance = (float)reportInfo.Template.HeaderDistance;
                    if (!headerVisible)
                    {
                        wSection.HeadersFooters.Header.ChildEntities.Clear();
                    }

                    wSection.PageSetup.FooterDistance = (float)reportInfo.Template.FooterDistance;
                    if (!footerVisible)
                    {
                        wSection.HeadersFooters.Footer.ChildEntities.Clear();
                    }

                    var endParagraph = wSection.AddParagraph();//hide blank page/paragraph after last table
                    endParagraph.BreakCharacterFormat.FontSize = 0;
                }
            }
            catch (Exception e)
            {
                Logger.WriteLineError($"Generate word document error {e}");
            }

            return wordDocument;
        }

        private static void OnSubstituteFont(object sender, SubstituteFontEventArgs args)
        {
            args.AlternateFontName = "Microsoft YaHei";
        }

        private static void InitTable(IWTable table)
        {
            table.ResetCells(1, 1);
            table.Rows[0].HeightType = TableRowHeightType.Exactly;
            table.TableFormat.Borders.BorderType = BorderStyle.None;
            table.TableFormat.Paddings.All = 0;// workaround for syncfusion bug
        }

        /// <summary>
        /// Add Block
        /// </summary>
        public static void AddBlock(ReportInfo reportInfo, IBlockElement blockElement, WTextBody textBody, ReportWordDocument wordDocument)
        {
            if (blockElement is Paragraph paragraph)
            {
                ParagraphGenerater.Generate(reportInfo, paragraph, textBody);
                return;
            }

            if (blockElement is RTTable rtTable)
            {
                if (rtTable.IsVisibleIn(reportInfo))
                {
                    TableGenerater.Generate(reportInfo, rtTable, textBody, _widthZoomRatio, true);
                    return;
                }

                if (reportInfo.Template.HeaderHeight != null && textBody.IsInHeader())
                    reportInfo.Template.HeaderHeight -= rtTable.RowDefinitions.Sum(x => x.Height);
            }

            if (blockElement is InputImageList inputImageList)
            {
                TableGenerater.GenerateInputImageList(reportInfo, inputImageList, textBody, _showImageIndex);
            }

            if (blockElement is AtlasElement atlasElement)
            {
                TableGenerater.GenerateAtlasElement(reportInfo, atlasElement, textBody, wordDocument);
            }
        }

        /// <summary>
        /// Set pagesetting
        /// </summary>
        private static void SetPageSetting(RTPageSize pageSize, RTThickness pagePadding, IWSection section)
        {
            // workaround fix for too large page size crash
            var width = (float)pageSize.Width;
            if (width > 3000)
                width = 3000;

            var height = (float)pageSize.Height;
            if (height > 3000)
                height = 3000;

            section.PageSetup.PageSize = new SizeF(width, height);
            section.PageSetup.Margins = new MarginsF((float)pagePadding.Left,
                (float)pagePadding.Top, (float)pagePadding.Right,
                (float)pagePadding.Bottom);
        }
    }
}