/*******************************************************************************
 * You may amend and distribute as you like, but don't remove this header!
 *
 * EPPlus provides server-side generation of Excel 2007/2010 spreadsheets.
 * See http://www.codeplex.com/EPPlus for details.
 *
 * Copyright (C) 2011  Jan Källman
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.

 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * The GNU Lesser General Public License can be viewed at http://www.opensource.org/licenses/lgpl-license.php
 * If you unfamiliar with this license or have questions about it, here is an http://www.gnu.org/licenses/gpl-faq.html
 *
 * All code and executables are provided "as is" with no warranty either express or implied.
 * The author accepts no liability for any damage or loss of business that this product may cause.
 *
 * Code change notes:
 *
 * Author							Change						Date
 * ******************************************************************************
 * Jan Källman		Added		21-MAR-2011
 * Jan Källman		License changed GPL-->LGPL 2011-12-16
 *******************************************************************************/

using System;
using System.Linq;
using System.Xml;

namespace AppsheetEpplus;

public enum eSourceType {
  /// <summary>
  /// Indicates that the cache contains data that consolidates ranges.
  /// </summary>
  Consolidation,

  /// <summary>
  /// Indicates that the cache contains data from an external data source.
  /// </summary>
  External,

  /// <summary>
  /// Indicates that the cache contains a scenario summary report
  /// </summary>
  Scenario,

  /// <summary>
  /// Indicates that the cache contains worksheet data
  /// </summary>
  Worksheet,
}

/// <summary>
/// Cache definition. This class defines the source data. Note that one cache definition can be shared between many pivot tables.
/// </summary>
public class ExcelPivotCacheDefinition : XmlHelper {
  internal ExcelPivotCacheDefinition(XmlNamespaceManager ns, ExcelPivotTable pivotTable)
      : base(ns, null) {
    foreach (var r in pivotTable.Part.GetRelationshipsByType(
        ExcelPackage._schemaRelationships + "/pivotCacheDefinition")) {
      Relationship = r;
    }
    CacheDefinitionUri = UriHelper.ResolvePartUri(Relationship.SourceUri, Relationship.TargetUri);

    var pck = pivotTable.WorkSheet._package.Package;
    Part = pck.GetPart(CacheDefinitionUri);
    LoadXmlSafe(CacheDefinitionXml, Part.GetStream());

    TopNode = CacheDefinitionXml.DocumentElement;
    PivotTable = pivotTable;
    if (CacheSource == eSourceType.Worksheet) {
      var worksheetName = GetXmlNodeString(_sourceWorksheetPath);
      if (pivotTable.WorkSheet.Workbook.Worksheets.Any(t => t.Name == worksheetName)) {
        _sourceRange = pivotTable
            .WorkSheet
            .Workbook
            .Worksheets[worksheetName].Cells[GetXmlNodeString(_sourceAddressPath)];
      }
    }
  }

  /// <summary>
  /// Reference to the internal package part
  /// </summary>
  internal ZipPackagePart Part { get; set; }

  /// <summary>
  /// Provides access to the XML data representing the cache definition in the package.
  /// </summary>
  public XmlDocument CacheDefinitionXml { get; private set; } = new();

  /// <summary>
  /// The package internal URI to the pivottable cache definition Xml Document.
  /// </summary>
  public Uri CacheDefinitionUri { get; internal set; }

  internal Uri CacheRecordUri { get; set; }

  internal ZipPackageRelationship Relationship { get; set; }

  internal ZipPackageRelationship RecordRelationship { get; set; }

  internal string RecordRelationshipID {
    get => GetXmlNodeString("@r:id");
    set => SetXmlNodeString("@r:id", value);
  }

  /// <summary>
  /// Referece to the PivoTable object
  /// </summary>
  public ExcelPivotTable PivotTable { get; private set; }

  private const string _sourceWorksheetPath = "d:cacheSource/d:worksheetSource/@sheet";
  private const string _sourceNamePath = "d:cacheSource/d:worksheetSource/@name";
  private const string _sourceAddressPath = "d:cacheSource/d:worksheetSource/@ref";
  internal ExcelRangeBase _sourceRange;

  /// <summary>
  /// The source data range when the pivottable has a worksheet datasource.
  /// The number of columns in the range must be intact if this property is changed.
  /// The range must be in the same workbook as the pivottable.
  /// </summary>
  public ExcelRangeBase SourceRange {
    get {
      if (_sourceRange == null) {
        if (CacheSource == eSourceType.Worksheet) {
          var ws = PivotTable.WorkSheet.Workbook.Worksheets[GetXmlNodeString(_sourceWorksheetPath)];
          if (ws
              == null) //Not worksheet, check name or table name
          {
            var name = GetXmlNodeString(_sourceNamePath);
            foreach (var n in PivotTable.WorkSheet.Workbook.Names) {
              if (name.Equals(n.Name, StringComparison.InvariantCultureIgnoreCase)) {
                _sourceRange = n;
                return _sourceRange;
              }
            }
            foreach (var w in PivotTable.WorkSheet.Workbook.Worksheets) {
              if (w.Tables._tableNames.ContainsKey(name)) {
                _sourceRange = w.Cells[w.Tables[name].Address.Address];
                break;
              }
              foreach (var n in w.Names) {
                if (name.Equals(n.Name, StringComparison.InvariantCultureIgnoreCase)) {
                  _sourceRange = n;
                  break;
                }
              }
            }
          } else {
            _sourceRange = ws.Cells[GetXmlNodeString(_sourceAddressPath)];
          }
        } else {
          throw (new ArgumentException("The cachesource is not a worksheet"));
        }
      }
      return _sourceRange;
    }
    set {
      if (PivotTable.WorkSheet.Workbook != value.Worksheet.Workbook) {
        throw (new ArgumentException("Range must be in the same package as the pivottable"));
      }

      var sr = SourceRange;
      if (value.End.Column - value.Start.Column != sr.End.Column - sr.Start.Column) {
        throw (new ArgumentException(
                "Can not change the number of columns(fields) in the SourceRange"));
      }

      SetXmlNodeString(_sourceWorksheetPath, value.Worksheet.Name);
      SetXmlNodeString(_sourceAddressPath, value.FirstAddress);
      _sourceRange = value;
    }
  }

  /// <summary>
  /// Type of source data
  /// </summary>
  public eSourceType CacheSource {
    get {
      var s = GetXmlNodeString("d:cacheSource/@type");
      if (s == "") {
        return eSourceType.Worksheet;
      }
      return (eSourceType)Enum.Parse(typeof(eSourceType), s, true);
    }
  }

  private string GetStartXml(ExcelRangeBase sourceAddress) {
    string xml =
        "<pivotCacheDefinition xmlns=\"http://schemas.openxmlformats.org/spreadsheetml/2006/main\" xmlns:r=\"http://schemas.openxmlformats.org/officeDocument/2006/relationships\" r:id=\"\" refreshOnLoad=\"1\" refreshedBy=\"SomeUser\" refreshedDate=\"40504.582403125001\" createdVersion=\"1\" refreshedVersion=\"3\" recordCount=\"5\" upgradeOnRefresh=\"1\">";

    xml += "<cacheSource type=\"worksheet\">";
    xml += string.Format(
        "<worksheetSource ref=\"{0}\" sheet=\"{1}\" /> ",
        sourceAddress.Address,
        sourceAddress.WorkSheet);
    xml += "</cacheSource>";
    xml += string.Format(
        "<cacheFields count=\"{0}\">",
        sourceAddress._toCol - sourceAddress._fromCol + 1);
    var sourceWorksheet = PivotTable.WorkSheet.Workbook.Worksheets[sourceAddress.WorkSheet];
    for (int col = sourceAddress._fromCol; col <= sourceAddress._toCol; col++) {
      if (sourceWorksheet == null
          || sourceWorksheet._values.GetValue(sourceAddress._fromRow, col) == null
          || sourceWorksheet._values.GetValue(sourceAddress._fromRow, col).ToString().Trim()
              == "") {
        xml += string.Format(
            "<cacheField name=\"Column{0}\" numFmtId=\"0\">",
            col - sourceAddress._fromCol + 1);
      } else {
        xml += string.Format(
            "<cacheField name=\"{0}\" numFmtId=\"0\">",
            sourceWorksheet._values.GetValue(sourceAddress._fromRow, col));
      }
      //xml += "<sharedItems containsNonDate=\"0\" containsString=\"0\" containsBlank=\"1\" /> ";
      xml += "<sharedItems containsBlank=\"1\" /> ";
      xml += "</cacheField>";
    }
    xml += "</cacheFields>";
    xml += "</pivotCacheDefinition>";

    return xml;
  }
}