using Elwig.Models.Dtos;
using System;
using System.Collections.Generic;
using System.Data.Entity.Core.Common.CommandTrees.ExpressionBuilder;
using System.Globalization;
using System.IO;
using System.IO.Compression;
using System.Linq;
using System.Threading.Tasks;

namespace Elwig.Helpers.Export {
    public class OdsFile : IDisposable {

        protected readonly string FileName;
        protected readonly ZipArchive ZipArchive;
        protected StreamWriter? Content;
        private readonly List<string> _tables;

        public OdsFile(string filename) {
            FileName = filename;
            File.Delete(filename);
            ZipArchive = ZipFile.Open(FileName, ZipArchiveMode.Create);
            _tables = [];
        }

        public void Dispose() {
            AddTrailer().GetAwaiter().GetResult();
            ZipArchive?.Dispose();
            GC.SuppressFinalize(this);
        }

        private async Task AddHeader() {
            var mimetype = ZipArchive.CreateEntry("mimetype", CompressionLevel.NoCompression);
            using (var writer = new StreamWriter(mimetype.Open(), Utils.UTF8)) {
                await writer.WriteAsync("application/vnd.oasis.opendocument.spreadsheet");
            }

            var manifest = ZipArchive.CreateEntry("META-INF/manifest.xml");
            using (var writer = new StreamWriter(manifest.Open(), Utils.UTF8)) {
                await writer.WriteAsync("""
                    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
                    <manifest:manifest xmlns:manifest="urn:oasis:names:tc:opendocument:xmlns:manifest:1.0" manifest:version="1.3">
                     <manifest:file-entry manifest:full-path="/" manifest:version="1.3" manifest:media-type="application/vnd.oasis.opendocument.spreadsheet"/>
                     <manifest:file-entry manifest:full-path="content.xml" manifest:media-type="text/xml"/>
                     <manifest:file-entry manifest:full-path="styles.xml" manifest:media-type="text/xml"/>
                     <manifest:file-entry manifest:full-path="meta.xml" manifest:media-type="text/xml"/>
                     <manifest:file-entry manifest:full-path="settings.xml" manifest:media-type="text/xml"/>
                    </manifest:manifest>

                    """);
            }

            var styles = ZipArchive.CreateEntry("styles.xml");
            using (var writer = new StreamWriter(styles.Open(), Utils.UTF8)) {
                await writer.WriteAsync("""
                    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
                    <office:document-styles xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" office:version="1.3">
                    </office:document-styles>

                    """);
            }

            var meta = ZipArchive.CreateEntry("meta.xml");
            using (var writer = new StreamWriter(meta.Open(), Utils.UTF8)) {
                var now = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ");
                await writer.WriteAsync($"""
                    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
                    <office:document-meta xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:meta="urn:oasis:names:tc:opendocument:xmlns:meta:1.0" xmlns:dc="http://purl.org/dc/elements/1.1/" office:version="1.3">
                     <office:meta>
                      <meta:generator>Elwig {App.Version}</meta:generator>
                      <meta:initial-creator>Elwig</meta:initial-creator>
                      <dc:creator>Elwig</dc:creator>
                      <meta:creation-date>{now}</meta:creation-date>
                      <dc:date>{now}</dc:date>
                     </office:meta>
                    </office:document-meta>

                    """);
            }

            var content = ZipArchive.CreateEntry("content.xml");
            Content = new StreamWriter(content.Open(), Utils.UTF8);
            await Content.WriteAsync("""
                <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
                <office:document-content xmlns:table="urn:oasis:names:tc:opendocument:xmlns:table:1.0" xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0" xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0" xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0" xmlns:calcext="urn:org:documentfoundation:names:experimental:calc:xmlns:calcext:1.0" xmlns:number="urn:oasis:names:tc:opendocument:xmlns:datastyle:1.0" office:version="1.3">
                 <office:automatic-styles>
                  <style:default-style style:family="table-cell">
                   <style:text-properties fo:language="de" fo:country="AT"/>
                  </style:default-style>
                  <style:style style:name="default" style:family="table-cell">
                   <style:table-cell-properties style:vertical-align="top"/>
                  </style:style>

                """);

            for (int i = 1; i <= 100; i++) {
                await Content.WriteAsync($"  <style:style style:name=\"col{i}mm\" style:family=\"table-column\"><style:table-column-properties style:column-width=\"{i}mm\"/></style:style>\r\n");
            }

            await Content.WriteAsync("""
                  <style:style style:name="header" style:family="table-cell" style:parent-style-name="default">
                   <style:table-cell-properties style:text-align-source="fix" style:repeat-content="false"/>
                   <style:paragraph-properties fo:text-align="center"/>
                   <style:text-properties fo:font-weight="bold" style:font-weight-asian="bold" style:font-weight-complex="bold" fo:font-size="16pt"/>
                  </style:style>
                  <style:style style:name="subheader" style:family="table-cell" style:parent-style-name="default">
                   <style:table-cell-properties style:text-align-source="fix" style:repeat-content="false"/>
                   <style:paragraph-properties fo:text-align="center"/>
                   <style:text-properties fo:font-weight="bold" style:font-weight-asian="bold" style:font-weight-complex="bold"/>
                  </style:style>
                  <style:style style:name="th" style:family="table-cell" style:parent-style-name="default">
                   <style:table-cell-properties style:text-align-source="fix" style:repeat-content="false" style:vertical-align="middle"/>
                   <style:paragraph-properties fo:text-align="center"/>
                   <style:text-properties fo:font-weight="bold" style:font-weight-asian="bold" style:font-weight-complex="bold"/>
                  </style:style>
                  <number:number-style style:name="NN0"><number:number number:decimal-places="0" number:min-decimal-places="0" number:min-integer-digits="1" number:grouping="true"/></number:number-style>
                  <style:style style:name="N0" style:family="table-cell" style:parent-style-name="default" style:data-style-name="NN0"/>
                  <number:number-style style:name="NN1"><number:number number:decimal-places="1" number:min-decimal-places="1" number:min-integer-digits="1" number:grouping="true"/></number:number-style>
                  <style:style style:name="N1" style:family="table-cell" style:parent-style-name="default" style:data-style-name="NN1"/>
                  <number:number-style style:name="NN2"><number:number number:decimal-places="2" number:min-decimal-places="2" number:min-integer-digits="1" number:grouping="true"/></number:number-style>
                  <style:style style:name="N2" style:family="table-cell" style:parent-style-name="default" style:data-style-name="NN2"/>
                  <number:number-style style:name="NN3"><number:number number:decimal-places="3" number:min-decimal-places="3" number:min-integer-digits="1" number:grouping="true"/></number:number-style>
                  <style:style style:name="N3" style:family="table-cell" style:parent-style-name="default" style:data-style-name="NN3"/>
                  <number:number-style style:name="NN4"><number:number number:decimal-places="4" number:min-decimal-places="4" number:min-integer-digits="1" number:grouping="true"/></number:number-style>
                  <style:style style:name="N4" style:family="table-cell" style:parent-style-name="default" style:data-style-name="NN4"/>
                  <number:number-style style:name="NN5"><number:number number:decimal-places="5" number:min-decimal-places="5" number:min-integer-digits="1" number:grouping="true"/></number:number-style>
                  <style:style style:name="N5" style:family="table-cell" style:parent-style-name="default" style:data-style-name="NN5"/>
                  <number:number-style style:name="NN6"><number:number number:decimal-places="6" number:min-decimal-places="6" number:min-integer-digits="1" number:grouping="true"/></number:number-style>
                  <style:style style:name="N6" style:family="table-cell" style:parent-style-name="default" style:data-style-name="NN6"/>
                  <number:date-style style:name="_date"><number:day number:style="long"/><number:text>.</number:text><number:month number:style="long"/><number:text>.</number:text><number:year number:style="long"/></number:date-style>
                  <style:style style:name="date" style:family="table-cell" style:parent-style-name="default" style:data-style-name="_date"/>
                  <number:time-style style:name="_time"><number:hours number:style="long"/><number:text>:</number:text><number:minutes number:style="long"/><number:text>:</number:text><number:seconds number:style="long"/></number:time-style>
                  <style:style style:name="time" style:family="table-cell" style:parent-style-name="default" style:data-style-name="_time"/>
                  <number:date-style style:name="_datetime">
                   <number:day number:style="long"/><number:text>.</number:text><number:month number:style="long"/><number:text>.</number:text><number:year number:style="long"/>
                   <number:text> </number:text>
                   <number:hours number:style="long"/><number:text>:</number:text><number:minutes number:style="long"/><number:text>:</number:text><number:seconds number:style="long"/>
                  </number:date-style>
                  <style:style style:name="datetime" style:family="table-cell" style:parent-style-name="default" style:data-style-name="_datetime"/>
                  <number:boolean-style style:name="_boolean"><number:boolean/></number:boolean-style>
                  <style:style style:name="boolean" style:family="table-cell" style:parent-style-name="default" style:data-style-name="_boolean"/>
                 </office:automatic-styles>
                 <office:body>
                  <office:spreadsheet>
                   <table:calculation-settings table:case-sensitive="false" table:search-criteria-must-apply-to-whole-cell="true" table:use-wildcards="true" table:use-regular-expressions="false" table:automatic-find-labels="false"/>

                """);
        }

        private async Task AddTrailer() {
            if (Content == null) await AddHeader();
            if (Content == null) return;

            await Content.WriteAsync("""
                  </office:spreadsheet>
                 </office:body>
                </office:document-content>

                """);
            Content.Close();
            Content.Dispose();
            Content = null;

            var settings = ZipArchive.CreateEntry("settings.xml");
            using (var writer = new StreamWriter(settings.Open(), Utils.UTF8)) {
                await writer.WriteAsync("""
                    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
                    <office:document-settings xmlns:config="urn:oasis:names:tc:opendocument:xmlns:config:1.0" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:ooo="http://openoffice.org/2004/office" xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0" office:version="1.3">
                     <office:settings>
                      <config:config-item-set config:name="ooo:view-settings">
                       <config:config-item-map-indexed config:name="Views">
                        <config:config-item-map-entry>
                         <config:config-item-map-named config:name="Tables">

                    """);

                foreach (var tbl in _tables) {
                    await writer.WriteAsync($"""
                              <config:config-item-map-entry config:name="{tbl}">
                               <config:config-item config:name="VerticalSplitMode" config:type="short">2</config:config-item>
                               <config:config-item config:name="VerticalSplitPosition" config:type="int">5</config:config-item>
                               <config:config-item config:name="PositionBottom" config:type="int">5</config:config-item>
                              </config:config-item-map-entry>

                        """);
                }

                await writer.WriteAsync("""
                         </config:config-item-map-named>
                        </config:config-item-map-entry>
                       </config:config-item-map-indexed>
                      </config:config-item-set>
                     </office:settings>
                    </office:document-settings>

                    """);
            }
        }

        public async Task AddTable<T>(DataTable<T> table, bool mergeSubRowCells = true) {
            if (Content == null) await AddHeader();
            if (Content == null) return;
            var totalSpan = table.ColumnSpans.Sum();

            _tables.Add(table.Name);
            await Content.WriteAsync($"    <table:table table:name=\"{table.Name}\" table:default-cell-style-name=\"default\">\r\n");
            foreach (var (s, w) in table.ColumnSpans.Zip(table.ColumnWidths)) {
                for (int i = 0; i < s; i++) {
                    await Content.WriteAsync("     <table:table-column" + (w != null ? $" table:style-name=\"col{(int)(w / s)}mm\"" : "") + "/>\r\n");
                }
            }

            await Content.WriteAsync(
                $"     <table:table-row>\r\n" +
                FormatCell(table.FullName, colSpan: totalSpan, style: "header") +
                $"     </table:table-row>\r\n" +
                $"     <table:table-row>\r\n" +
                FormatCell(table.Subtitle, colSpan: totalSpan, style: "subheader") +
                $"     </table:table-row>\r\n" +
                $"     <table:table-row>\r\n" +
                $"      <table:table-cell table:number-columns-repeated=\"{totalSpan}\"/>\r\n" +
                $"     </table:table-row>\r\n" +
                $"     <table:table-row>\r\n");
            foreach (var (name, span, units) in table.ColumnNames.Zip(table.ColumnSpans, table.ColumnUnits)) {
                var hasUnits = units.Length > 0;
                await Content.WriteAsync(FormatCell(name, colSpan: span, rowSpan: hasUnits ? 1 : 2, style: "th"));
            }
            await Content.WriteAsync("     </table:table-row>\r\n     <table:table-row>\r\n");
            foreach (var (span, units) in table.ColumnSpans.Zip(table.ColumnUnits)) {
                if (units.Length == 0) {
                    await Content.WriteAsync($"      <table:covered-table-cell table:number-columns-repeated=\"{span}\"/>\r\n");
                    continue;
                }
                foreach (var u in units) {
                    await Content.WriteAsync(FormatCell(u == null ? null : $"[{u}]", style: "th"));
                }
            }
            await Content.WriteAsync("     </table:table-row>\r\n");

            foreach (var row in table.GetData()) {
                await FormatRow(row, table.ColumnUnits, mergeSubRowCells);
            }

            await Content.WriteAsync("    </table:table>\r\n");
        }

        protected async Task FormatRow(IEnumerable<object?> row, IEnumerable<string?[]?> colUnits, bool mergeSubRowCells) {
            if (Content == null) throw new InvalidOperationException();
            var arrays = row.Where(c => c is Array).Cast<Array>().Select(c => c.Length).ToArray();
            int rowNum = Math.Max(1, arrays.Length > 0 ? arrays.Max() : 0);
            for (int i = 0; i < rowNum; i++) {
                await Content.WriteAsync("     <table:table-row>\r\n");
                foreach (var (data, units) in row.Zip(colUnits)) {
                    if (data is Array a) {
                        await Content.WriteAsync(i < a.Length ? FormatCell(a.GetValue(i), units: units) : $"      <table:table-cell table:number-columns-repeated=\"{GetSubCols(a.GetType().GetElementType())}\"/>\r\n");
                    } else if (!mergeSubRowCells) {
                        await Content.WriteAsync(FormatCell(data, units: units));
                    } else {
                        await Content.WriteAsync(FormatCell(data, rowSpan: i == 0 ? rowNum : 1, isCovered: i > 0, units: units));
                    }
                }
                await Content.WriteAsync("     </table:table-row>\r\n");
            }
        }

        private static int GetSubCols(Type? type) {
            if (type != null && type.IsValueType == true && type.Name.StartsWith("ValueTuple"))
                return type.GetFields().Length;
            return 1;
        }

        protected static string FormatCell(object? data, int rowSpan = 1, int colSpan = 1, string? style = "default", bool isCovered = false, string?[]? units = null) {
            if (data?.GetType().IsValueType == true && data.GetType().Name.StartsWith("ValueTuple"))
                return string.Join("", data.GetType().GetFields().Zip(units ?? [])
                    .Select(p => FormatCell(p.First.GetValue(data), rowSpan, colSpan, style, isCovered, [p.Second]))
                );

            var add = (style != null ? $" table:style-name=\"{style}\"" : "") + (rowSpan > 1 || colSpan > 1 ? $" table:number-rows-spanned=\"{rowSpan}\" table:number-columns-spanned=\"{colSpan}\"" : "");
            string ct = isCovered ? "table:covered-table-cell" : "table:table-cell";
            var isPercent = units != null && units.Length > 0 && units[0] == "%";

            string c;
            if (data == null) {
                c = $"<{ct}{add}/>";
            } else if (data is bool b) {
                add = string.Join(' ', add.Split(' ').Select(p => p.StartsWith("table:style-name=") ? $"table:style-name=\"boolean\"" : p));
                c = $"<{ct} office:value-type=\"boolean\" calcext:value-type=\"boolean\" office:boolean-value=\"{(b ? "true" : "false")}\"{add}><text:p>{(b ? "Ja" : "Nein")}</text:p></{ct}>";
            } else if (data is DateOnly date) {
                add = string.Join(' ', add.Split(' ').Select(p => p.StartsWith("table:style-name=") ? $"table:style-name=\"date\"" : p));
                c = $"<{ct} office:value-type=\"date\" calcext:value-type=\"date\" office:date-value=\"{date:yyyy-MM-dd}\"{add}><text:p>{date:dd.MM.yyyy}</text:p></{ct}>";
            } else if (data is TimeOnly time) {
                add = string.Join(' ', add.Split(' ').Select(p => p.StartsWith("table:style-name=") ? $"table:style-name=\"time\"" : p));
                c = $"<{ct} office:value-type=\"time\" calcext:value-type=\"time\" office:time-value=\"{time:\\P\\THH\\Hmm\\Mss\\S}\"{add}><text:p>{time:HH:mm:ss}</text:p></{ct}>";
            } else if (data is DateTime dt) {
                add = string.Join(' ', add.Split(' ').Select(p => p.StartsWith("table:style-name=") ? $"table:style-name=\"datetime\"" : p));
                c = $"<{ct} office:value-type=\"date\" calcext:value-type=\"date\" office:date-value=\"{dt:yyyy-MM-dd\\THH:mm:ss}\"{add}><text:p>{dt:dd.MM.yyyy HH:mm:ss}</text:p></{ct}>";
            } else if (data is decimal || data is float || data is double || data is byte || data is char ||
                       data is short || data is ushort || data is int || data is uint || data is long || data is ulong) {
                double v = double.Parse(data?.ToString() ?? "0");  // use default culture for ToString and Parse()!
                if (units != null && units.Length > 0) {
                    int n = -1;
                    switch (units[0]) {
                        case "%": n = 1; data = $"{v:N1}"; break;
                        case "€": n = 2; data = $"{v:N2}"; break;
                        case "°KMW": n = 1; data = $"{v:N1}"; break;
                        case "°Oe": n = 0; data = $"{v:N0}"; break;
                        case "m²": n = 0; data = $"{v:N0}"; break;
                    }
                    if (n >= 0) add = string.Join(' ', add.Split(' ').Select(p => p.StartsWith("table:style-name=") ? $"table:style-name=\"N{n}\"" : p));
                }
                c = $"<{ct} office:value-type=\"float\" calcext:value-type=\"float\" office:value=\"{v.ToString(CultureInfo.InvariantCulture)}\"{add}><text:p>{data}</text:p></{ct}>";
            } else {
                c = $"<{ct} office:value-type=\"string\" calcext:value-type=\"string\"{add}><text:p>{data}</text:p></{ct}>";
            }

            return $"      {c}\r\n" + (colSpan > 1 ? $"      <table:covered-table-cell table:number-rows-repeated=\"{colSpan - 1}\"/>\r\n" : "");
        }
    }
}