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//
// xlsx.cs: Support for loading OOXML spreadsheets
//
// Authors:
// Miguel de Icaza (miguel@novell.com)
//
// Copyright 2008 Novell, Inc (http://www.novell.com).
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.IO;
using System.Collections.Generic;

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


using System.Reflection;

namespace Wahid.SpreadsheetML {

public enum CellType {
Boolean,
Error,
InlineString, // value inside <is> not inside <v> in the cell.
Number,
SharedString,
FormulaString
}

public class LoadException : Exception {
public LoadException (string msg) : base (msg) {}
}

public class Relationship {
public enum RType {
SharedStrings,
Worksheet,
Styles,
Theme,
CalcChain,
Unknown
}

public string Id;
public string Target;
public RType Type;

public static RType Lookup (string s)
{
switch (s){
case "http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings":
return RType.SharedStrings;
case "http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet":
return RType.Worksheet;
case "http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles":
return RType.Styles;
case "http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme":
return RType.Theme;
case "http://schemas.openxmlformats.org/officeDocument/2006/relationships/calcChain":
return RType.CalcChain;
}
return RType.Unknown;
}

public Relationship (RType type, string id, string target)
{
Id = id;
Target = target;
Type = type;
}

}

static public class OOXML {
public static XNamespace ns_workbook = "http://schemas.openxmlformats.org/spreadsheetml/2006/main";
public static XNamespace ns_rels = "http://schemas.openxmlformats.org/officeDocument/2006/relationships";

public static XName c = "c";
public static XName f = ns_workbook + "f";
public static XName r = "r";
public static XName s = "s";
public static XName t = "t";
public static XName v = ns_workbook + "v";
public static XName is_ = "is";

public static void ParseReference (string s, out int col, out int row)
{
col = 0;
row = 0;

if (s == null)
return;

foreach (char c in s){
if (c >= 'A' && c <= 'Z'){
col = col * 26 + ((int) c) - 'A';
} else {
row = row * 10 + ((int) c - '0');
}
}
}

public static CellType GetCellType (XElement xcell, CellType defvalue)
{
string type = (string) xcell.Attribute (t);

switch (type){
case "b":
return CellType.Boolean;
case "e":
return CellType.Error;
case "inlineStr":
return CellType.InlineString;
case "n":
return CellType.Number;
case "s":
return CellType.SharedString;
case "str":
return CellType.FormulaString;
case null:
return defvalue;
}
throw new LoadException ("Unknown type for cell: " + type);
}
}

public class Xlsx {
public Workbook Workbook { get; private set; }
public string Error { get; private set; }

Dictionary<string,Relationship> relationships;
List<Value> sharedstrings;

ZipAccess loader;

public static Xlsx Load (string filename)
{
Xlsx x = new Xlsx (new DirAccess (filename));

x.Load ();

#if false
try {
} catch (Exception e){
if (x.Error == null)
x.Error = "Generic loading error";
x.Error += e;
x.Workbook = null;
}
#endif

return x;
}

Xlsx (ZipAccess loader)
{
Workbook = new Workbook ();
this.loader = loader;
Error = null;
}

TextReader Get (string part)
{
try {
return new StreamReader (loader.Get (part));
} catch {
Error = "Failure to retrieve part " + part;
throw new LoadException (Error);
}
}

class Dingus {
public Dingus (string s)
{
Console.WriteLine (s);
}
}

void LoadRelationships ()
{
relationships = new Dictionary<string,Relationship> ();

XElement xrel = XElement.Load (Get ("xl/_rels/workbook.xml.rels"));

var x =
from rel in xrel.Elements ()
let type = Relationship.Lookup ((string) rel.Attribute ("Type"))
where type != Relationship.RType.Unknown
select new Relationship (type,
(string) rel.Attribute ("Id"),
(string) rel.Attribute ("Target"));
relationships = x.ToDictionary (f => f.Id);
}

void LoadSharedStrings ()
{
sharedstrings = new List<Value> ();

XElement xsharedstrings = null;

try {
xsharedstrings = XElement.Load (Get ("xl/sharedStrings.xml"));
} catch {
// not an error to not have sharedStrings
return;
}

foreach (var ssi in xsharedstrings.Elements ()){
XElement first = ssi.FirstNode as XElement;

if (first.Name == OOXML.t)
sharedstrings.Add (new StringValue (first.Value));
else
sharedstrings.Add (new RichStringValue (first));
}
}

void LoadSheetData (Sheet sheet, XElement xsheetData)
{
// <row>
foreach (XElement xrow in xsheetData.Elements ()){
int row = Int32.Parse ((string) xrow.Attribute ("r"));

// <c>
foreach (XElement xcell in xrow.Elements ()){
int cell_col, cell_row;

// r=
OOXML.ParseReference ((string) xcell.Attribute (OOXML.r), out cell_col, out cell_row);

if (row != cell_row){
// this should not happen

Error = "Document contains cell references outside of their row";
throw new Exception ();
}

Cell cell = sheet.CreateCell (cell_col, cell_row);

//CellType type = OOXML.GetCellType (xcell, CellType.Number);
string type = (string) xcell.Attribute (OOXML.t);

foreach (XElement cval in xcell.Elements ()){
if (type == "inlineStr"){
if (cval.Name == OOXML.is_)
cell.Value = new RichStringValue (cval);
else
throw new LoadException ("Cell type is InlineString, but found other values");
}

if (cval.Name == OOXML.f){
cell.Formula = new Formula (cval.Value);
continue;
}

if (cval.Name == OOXML.v){
string s = cval.Value;
bool v;

switch (type){
case "b":
if (bool.TryParse (s, out v))
cell.Value = new BoolValue (v);
else
cell.Value = new BoolValue (int.Parse (s) == 1);
break;

case "e":
cell.Value = new ErrorValue (s);
break;

case "n":
cell.Value = new NumberValue (double.Parse (s));
break;

case "s":
// Lookup the string in the share string table
cell.Value = sharedstrings [Int32.Parse (s)];
break;

case "str":
cell.Value = new StringValue (cval.Value);
break;
}
}
}
}
}
}

void LoadSheet (Sheet sheet, XElement xsheet)
{
XName xcols = OOXML.ns_workbook + "cols";
XName xsheetData = OOXML.ns_workbook + "sheetData";

foreach (XElement se in xsheet.Elements ()){
if (se.Name == xsheetData)
LoadSheetData (sheet, se);
}
}

void LoadWorkbook ()
{
XElement xwork = XElement.Load (Get ("xl/workbook.xml"));

// Since Linq.XPath is not working, work around it
var sheets_and_sources = from l in xwork.Elements ()
let xsheets = OOXML.ns_workbook + "sheets"
let xrid = OOXML.ns_rels + "id"
where l.Name == xsheets
from s in l.Elements ()
let rtarget = relationships [(string) s.Attribute (xrid)].Target
let sheet = Workbook.CreateSheet ((string)s.Attribute ("name"),
(int) s.Attribute ("sheetId"))
select new { sheet, rtarget } ;

foreach (var ss in sheets_and_sources)
LoadSheet (ss.sheet, XElement.Load (Get ("xl/" + ss.rtarget)));
}

void Load ()
{
LoadRelationships ();
// LoadStyle ();
LoadSharedStrings ();
LoadWorkbook ();
}
}
}
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