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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */


#include "nsCRT.h"
#include "nsCOMPtr.h"

#include "nsIRDFService.h"
#include "nsRDFCID.h"
#include "nsIRDFDataSource.h"
#include "nsIRDFRemoteDataSource.h"
#include "rdf.h"

#include "nsIServiceManager.h"

#include "nsEnumeratorUtils.h"

#include "nsXPIDLString.h"

#ifdef DEBUG
#include <stdio.h>
#endif

/**
 * RDF vocabulary describing assertions in inner datasource
 *
 * For a particular resource, we want to provide all arcs out and
 * in that the inner datasource has.
 * This is done by introducing helper resources for each triple of
 * the form
 *   x-moz-dsds:<subject-resource-pointer><predicate-resource-pointer>\
 *              <object-node-pointer>
 * For each triple, that has the resource in question as subject, a
 * "arcsout" assertion goes from that resource to a x-moz-dsds resource.
 * For each triple, that has the resource in question as object, a
 * "arcsin" assertion goes from that resource to a x-moz-dsds resource.
 * For each x-moz-dsds resource, there is a "subject" arc to the subject,
 * a "predicate" arc to the predicate and a "object" arc to the object.
 *
 * The namespace of this vocabulary is
 * "http://www.mozilla.org/rdf/vocab/dsds".
 * 
 * XXX we might want to add a "qname" resource from each resource to a
 * somewhat canonical "prefix:localname" literal.
 */

#define NS_RDF_DSDS_NAMESPACE_URI "http://www.mozilla.org/rdf/vocab/dsds#"
#define NS_RDF_ARCSOUT NS_RDF_DSDS_NAMESPACE_URI "arcsout"
#define NS_RDF_ARCSIN NS_RDF_DSDS_NAMESPACE_URI "arcsin"
#define NS_RDF_SUBJECT NS_RDF_DSDS_NAMESPACE_URI "subject"
#define NS_RDF_PREDICATE NS_RDF_DSDS_NAMESPACE_URI "predicate"
#define NS_RDF_OBJECT NS_RDF_DSDS_NAMESPACE_URI "object"

#define NC_RDF_Name  NC_NAMESPACE_URI "Name"
#define NC_RDF_Value NC_NAMESPACE_URI "Value"
#define NC_RDF_Child NC_NAMESPACE_URI "child"

static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);

class nsRDFDataSourceDataSource :
    public nsIRDFDataSource,
    public nsIRDFRemoteDataSource {
public: 
  NS_DECL_ISUPPORTS
  NS_DECL_NSIRDFDATASOURCE
  NS_DECL_NSIRDFREMOTEDATASOURCE

  nsRDFDataSourceDataSource();
  virtual ~nsRDFDataSourceDataSource();
  
private:
  nsCString mURI;
  nsCOMPtr<nsIRDFDataSource> mDataSource;

  static nsIRDFResource* kNC_Name;
  static nsIRDFResource* kNC_Value;
  static nsIRDFResource* kNC_Child;
  
};

nsIRDFResource* nsRDFDataSourceDataSource::kNC_Name=nullptr;
nsIRDFResource* nsRDFDataSourceDataSource::kNC_Value=nullptr;
nsIRDFResource* nsRDFDataSourceDataSource::kNC_Child=nullptr;


nsRDFDataSourceDataSource::nsRDFDataSourceDataSource()
{
}

nsRDFDataSourceDataSource::~nsRDFDataSourceDataSource()
{
}


NS_IMPL_ISUPPORTS2(nsRDFDataSourceDataSource,
                   nsIRDFDataSource,
                   nsIRDFRemoteDataSource)

/**
 * Implement nsIRDFRemoteDataSource
 */

/* readonly attribute boolean loaded; */
NS_IMETHODIMP nsRDFDataSourceDataSource::GetLoaded(bool *aLoaded)
{
    nsCOMPtr<nsIRDFRemoteDataSource> remote =
        do_QueryInterface(mDataSource);
    if (remote) {
        return remote->GetLoaded(aLoaded);
    }
    *aLoaded = true;
    return NS_OK;
}

/* void Init (in string uri); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::Init(const char *uri)
{
  nsresult rv;

  mURI = uri;

  // cut off "rdf:datasource?"
  NS_NAMED_LITERAL_CSTRING(prefix, "rdf:datasource");
  nsAutoCString mInnerURI;
  mInnerURI = Substring(mURI, prefix.Length() + 1);
  // bail if datasorce is empty or we're trying to inspect ourself
  if (mInnerURI.IsEmpty() || mInnerURI == prefix) {
      mURI.Truncate();
      return NS_ERROR_INVALID_ARG;
  }
  nsCOMPtr<nsIRDFService> rdf(do_GetService(kRDFServiceCID, &rv));
  rv = rdf->GetDataSource(mInnerURI.get(), getter_AddRefs(mDataSource));
  if (NS_FAILED(rv)) {
      mURI.Truncate();
      NS_WARNING("Could not get inner datasource");
      return rv;
  }

  // get RDF resources
  
  if (!kNC_Name) {
    rdf->GetResource(NS_LITERAL_CSTRING(NC_RDF_Name), &kNC_Name);
    rdf->GetResource(NS_LITERAL_CSTRING(NC_RDF_Child), &kNC_Child);
    rdf->GetResource(NS_LITERAL_CSTRING(NC_RDF_Value), &kNC_Value);
  }

#ifdef DEBUG_alecf
  printf("nsRDFDataSourceDataSource::Init(%s)\n", uri);
#endif
  
  return NS_OK;
}

/* void Refresh (in boolean aBlocking); */
NS_IMETHODIMP nsRDFDataSourceDataSource::Refresh(bool aBlocking)
{
    nsCOMPtr<nsIRDFRemoteDataSource> remote =
        do_QueryInterface(mDataSource);
    if (remote) {
        return remote->Refresh(aBlocking);
    }
    return NS_OK;
}

/* void Flush (); */
NS_IMETHODIMP nsRDFDataSourceDataSource::Flush()
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/* void FlushTo (in string aURI); */
NS_IMETHODIMP nsRDFDataSourceDataSource::FlushTo(const char *aURI)
{
    return NS_ERROR_NOT_IMPLEMENTED;
}

/**
 * Implement nsIRDFDataSource
 */

/* readonly attribute string URI; */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetURI(char * *aURI)
{
#ifdef DEBUG_alecf
  printf("nsRDFDataSourceDataSource::GetURI()\n");
#endif
  *aURI = ToNewCString(mURI);
  
  return NS_OK;
}

/* nsIRDFResource GetSource (in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetSource(nsIRDFResource *aProperty,
                                     nsIRDFNode *aTarget,
                                     bool aTruthValue,
                                     nsIRDFResource **_retval)
{
  return NS_RDF_NO_VALUE;
}

/* nsISimpleEnumerator GetSources (in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetSources(nsIRDFResource *aProperty,
                                      nsIRDFNode *aTarget,
                                      bool aTruthValue,
                                      nsISimpleEnumerator **_retval)
{
  return NS_RDF_NO_VALUE;
}

/* nsIRDFNode GetTarget (in nsIRDFResource aSource, in nsIRDFResource aProperty, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetTarget(nsIRDFResource *aSource,
                                     nsIRDFResource *aProperty,
                                     bool aTruthValue,
                                     nsIRDFNode **_retval)
{
#ifdef DEBUG_alecf
  nsXPIDLCString sourceval;
  nsXPIDLCString propval;
  aSource->GetValue(getter_Copies(sourceval));
  aProperty->GetValue(getter_Copies(propval));
  printf("GetTarget(%s, %s,..)\n", (const char*)sourceval,
         (const char*)propval);
#endif

  return NS_OK;
}

/* nsISimpleEnumerator GetTargets (in nsIRDFResource aSource, in nsIRDFResource aProperty, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetTargets(nsIRDFResource *aSource,
                                      nsIRDFResource *aProperty,
                                      bool aTruthValue,
                                      nsISimpleEnumerator **_retval)
{
  nsXPIDLCString sourceval;
  aSource->GetValue(getter_Copies(sourceval));
  nsXPIDLCString propval;
  aProperty->GetValue(getter_Copies(propval));
#ifdef DEBUG_alecf
  printf("GetTargets(%s, %s,..)\n", (const char*)sourceval,
         (const char*)propval);
#endif
  
  nsresult rv;
  bool isProp;
  nsCOMPtr<nsISupportsArray> arcs;
  nsISimpleEnumerator *enumerator;
  
  if (NS_SUCCEEDED(aProperty->EqualsNode(kNC_Child, &isProp)) &&
      isProp) {

    // here we need to determine if we need to extract out the source
    // or use aSource?
    if (StringBeginsWith(sourceval, NS_LITERAL_CSTRING("dsresource:"))) {
      // somehow get the source
      // XXX ? rv = mDataSource->ArcLabelsOut(realsource, &enumerator);      
      rv = mDataSource->ArcLabelsOut(aSource, &enumerator);      
    } else {
      rv = mDataSource->ArcLabelsOut(aSource, &enumerator);
    }
    // enumerate all the children and create the composite resources
    bool hasMoreArcs=false;

    rv = enumerator->HasMoreElements(&hasMoreArcs);
    while (NS_SUCCEEDED(rv) && hasMoreArcs) {
      
      // get the next arc
      nsCOMPtr<nsISupports> arcSupports;
      rv = enumerator->GetNext(getter_AddRefs(arcSupports));
      nsCOMPtr<nsIRDFResource> arc = do_QueryInterface(arcSupports, &rv);

      // get all the resources on the ends of the arc arcs
      nsCOMPtr<nsISimpleEnumerator> targetEnumerator;
      rv = mDataSource->GetTargets(aSource, arc, true,
                                   getter_AddRefs(targetEnumerator));

      bool hasMoreTargets;
      rv = targetEnumerator->HasMoreElements(&hasMoreTargets);
      while (NS_SUCCEEDED(rv) && hasMoreTargets) {
        // get the next target
        nsCOMPtr<nsISupports> targetSupports;
        rv = enumerator->GetNext(getter_AddRefs(targetSupports));
        nsCOMPtr<nsIRDFResource> target=do_QueryInterface(targetSupports, &rv);

        // now we have an (arc, target) tuple that will be our node
        // arc will become #Name
        // target will become #Value
#ifdef DEBUG_alecf
        nsXPIDLString arcValue;
        nsXPIDLString targetValue;

        arc->GetValue(getter_Copies(arcValue));
        target->GetValue(getter_Copies(targetValue));
        printf("#child of %s:\n\t%s = %s\n",
               (const char*)sourceval
#endif

      }
      
      rv = enumerator->HasMoreElements(&hasMoreArcs);
    }
    
  } else if (NS_SUCCEEDED(aProperty->EqualsNode(kNC_Name, &isProp)) &&
             isProp) {
    if (StringBeginsWith(sourceval, NS_LITERAL_CSTRING("dsresource:"))) {
      // extract out the name

    }
    
  } else if (NS_SUCCEEDED(aProperty->EqualsNode(kNC_Value, &isProp)) &&
             isProp) {


  } else {
    rv = NS_NewISupportsArray(getter_AddRefs(arcs));
    if (NS_FAILED(rv)) return rv;
    
    nsArrayEnumerator* cursor =
      new nsArrayEnumerator(arcs);

    if (!cursor) return NS_ERROR_OUT_OF_MEMORY;
    
    *_retval = cursor;
    NS_ADDREF(*_retval);
  }
  
  return NS_OK;
}

/* void Assert (in nsIRDFResource aSource, in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::Assert(nsIRDFResource *aSource, nsIRDFResource *aProperty, nsIRDFNode *aTarget, bool aTruthValue)
{
  return NS_RDF_NO_VALUE;
}

/* void Unassert (in nsIRDFResource aSource, in nsIRDFResource aProperty, in nsIRDFNode aTarget); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::Unassert(nsIRDFResource *aSource, nsIRDFResource *aProperty, nsIRDFNode *aTarget)
{
  return NS_RDF_NO_VALUE;
}

/* boolean HasAssertion (in nsIRDFResource aSource, in nsIRDFResource aProperty, in nsIRDFNode aTarget, in boolean aTruthValue); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::HasAssertion(nsIRDFResource *aSource, nsIRDFResource *aProperty, nsIRDFNode *aTarget, bool aTruthValue, bool *_retval)
{
  return NS_RDF_NO_VALUE;
}

/* void AddObserver (in nsIRDFObserver aObserver); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::AddObserver(nsIRDFObserver *aObserver)
{
  return NS_RDF_NO_VALUE;
}

/* void RemoveObserver (in nsIRDFObserver aObserver); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::RemoveObserver(nsIRDFObserver *aObserver)
{
  return NS_RDF_NO_VALUE;
}

/* nsISimpleEnumerator ArcLabelsIn (in nsIRDFNode aNode); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::ArcLabelsIn(nsIRDFNode *aNode, nsISimpleEnumerator **_retval)
{
  return NS_RDF_NO_VALUE;
}

/* nsISimpleEnumerator ArcLabelsOut (in nsIRDFResource aSource); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::ArcLabelsOut(nsIRDFResource *aSource,
                                        nsISimpleEnumerator **_retval)
{
  nsresult rv=NS_OK;
  
  nsCOMPtr<nsISupportsArray> arcs;
  rv = NS_NewISupportsArray(getter_AddRefs(arcs));
  
  if (NS_FAILED(rv)) return rv;
  nsXPIDLCString sourceval;
  aSource->GetValue(getter_Copies(sourceval));
  
#ifdef DEBUG_alecf
  printf("ArcLabelsOut(%s)\n", (const char*)sourceval);
#endif
  
  arcs->AppendElement(kNC_Name);
  arcs->AppendElement(kNC_Value);
  arcs->AppendElement(kNC_Child);

  nsArrayEnumerator* cursor =
    new nsArrayEnumerator(arcs);

  if (!cursor) return NS_ERROR_OUT_OF_MEMORY;
  
  NS_ADDREF(cursor);
  *_retval = cursor;

  return NS_OK;
}

/* nsISimpleEnumerator GetAllResources (); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::GetAllResources(nsISimpleEnumerator **_retval)
{
  return NS_RDF_NO_VALUE;
}

/* boolean IsCommandEnabled (in nsISupportsArray aSources, in nsIRDFResource aCommand, in nsISupportsArray aArguments); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::IsCommandEnabled(nsISupportsArray * aSources, nsIRDFResource *aCommand, nsISupportsArray * aArguments, bool *_retval)
{
  return NS_RDF_NO_VALUE;
}

/* void DoCommand (in nsISupportsArray aSources, in nsIRDFResource aCommand, in nsISupportsArray aArguments); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::DoCommand(nsISupportsArray * aSources, nsIRDFResource *aCommand, nsISupportsArray * aArguments)
{
  return NS_RDF_NO_VALUE;
}

/* void beginUpdateBatch (); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::BeginUpdateBatch()
{
  return NS_OK;
}

/* void endUpdateBatch (); */
NS_IMETHODIMP
nsRDFDataSourceDataSource::EndUpdateBatch()
{
  return NS_OK;
}

nsresult
NS_NewRDFDataSourceDataSource(nsISupports *, const nsIID& iid,
                              void ** result)

{
  nsRDFDataSourceDataSource * dsds = new nsRDFDataSourceDataSource();
  if (!dsds) return NS_ERROR_NOT_INITIALIZED;
  return dsds->QueryInterface(iid, result);
  
}