/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */

#ifndef TRANSFRMX_TXEXECUTIONSTATE_H
#define TRANSFRMX_TXEXECUTIONSTATE_H

#include "txCore.h"
#include "txStack.h"
#include "txXMLUtils.h"
#include "txIXPathContext.h"
#include "txVariableMap.h"
#include "nsTHashtable.h"
#include "nsHashKeys.h"
#include "txKey.h"
#include "txStylesheet.h"
#include "txXPathTreeWalker.h"
#include "nsTArray.h"
#include "mozilla/Result.h"

class txAOutputHandlerFactory;
class txAXMLEventHandler;
class txInstruction;

class txLoadedDocumentEntry : public nsStringHashKey {
 public:
  explicit txLoadedDocumentEntry(KeyTypePointer aStr)
      : nsStringHashKey(aStr), mLoadResult(NS_OK) {}
  txLoadedDocumentEntry(txLoadedDocumentEntry&& aOther)
      : nsStringHashKey(std::move(aOther)),
        mDocument(std::move(aOther.mDocument)),
        mLoadResult(std::move(aOther.mLoadResult)) {
    NS_ERROR("We're horked.");
  }
  ~txLoadedDocumentEntry() {
    if (mDocument) {
      txXPathNodeUtils::release(mDocument.get());
    }
  }
  bool LoadingFailed() {
    NS_ASSERTION(NS_SUCCEEDED(mLoadResult) || !mDocument,
                 "Load failed but we still got a document?");

    return NS_FAILED(mLoadResult);
  }

  mozilla::UniquePtr<txXPathNode> mDocument;
  nsresult mLoadResult;
};

class txLoadedDocumentsHash : public nsTHashtable<txLoadedDocumentEntry> {
 public:
  txLoadedDocumentsHash() : nsTHashtable<txLoadedDocumentEntry>(4) {}
  ~txLoadedDocumentsHash();
  [[nodiscard]] nsresult init(const txXPathNode& aSource);

 private:
  friend class txExecutionState;
  mozilla::UniquePtr<txXPathNode> mSourceDocument;
};

class txExecutionState : public txIMatchContext {
 public:
  txExecutionState(txStylesheet* aStylesheet, bool aDisableLoads);
  ~txExecutionState();
  nsresult init(const txXPathNode& aNode,
                txOwningExpandedNameMap<txIGlobalParameter>* aGlobalParams);
  nsresult end(nsresult aResult);

  TX_DECL_MATCH_CONTEXT;

  /**
   * Struct holding information about a current template rule
   */
  class TemplateRule {
   public:
    txStylesheet::ImportFrame* mFrame;
    int32_t mModeNsId;
    RefPtr<nsAtom> mModeLocalName;
    RefPtr<txParameterMap> mParams;
  };

  // Stack functions
  void pushEvalContext(txIEvalContext* aContext);
  txIEvalContext* popEvalContext();

  /**
   * Helper that deletes all entries before |aContext| and then
   * pops it off the stack. The caller must delete |aContext| if
   * desired.
   */
  void popAndDeleteEvalContextUntil(txIEvalContext* aContext);

  void pushBool(bool aBool);
  bool popBool();
  void pushResultHandler(txAXMLEventHandler* aHandler);
  txAXMLEventHandler* popResultHandler();
  void pushTemplateRule(txStylesheet::ImportFrame* aFrame,
                        const txExpandedName& aMode, txParameterMap* aParams);
  void popTemplateRule();
  void pushParamMap(txParameterMap* aParams);
  already_AddRefed<txParameterMap> popParamMap();

  // state-getting functions
  txIEvalContext* getEvalContext();
  const txXPathNode* retrieveDocument(const nsAString& aUri);
  nsresult getKeyNodes(const txExpandedName& aKeyName, const txXPathNode& aRoot,
                       const nsAString& aKeyValue, bool aIndexIfNotFound,
                       txNodeSet** aResult);
  TemplateRule* getCurrentTemplateRule();
  const txXPathNode& getSourceDocument() {
    NS_ASSERTION(mLoadedDocuments.mSourceDocument, "Need a source document!");

    return *mLoadedDocuments.mSourceDocument;
  }

  // state-modification functions
  mozilla::Result<txInstruction*, nsresult> getNextInstruction();
  nsresult runTemplate(txInstruction* aInstruction);
  nsresult runTemplate(txInstruction* aInstruction, txInstruction* aReturnTo);
  void gotoInstruction(txInstruction* aNext);
  void returnFromTemplate();
  nsresult bindVariable(const txExpandedName& aName, txAExprResult* aValue);
  void removeVariable(const txExpandedName& aName);
  void stopProcessing() { mStopProcessing = true; }

  txAXMLEventHandler* mOutputHandler;
  txAXMLEventHandler* mResultHandler;
  mozilla::UniquePtr<txAXMLEventHandler> mObsoleteHandler;
  txAOutputHandlerFactory* mOutputHandlerFactory;

  RefPtr<txParameterMap> mTemplateParams;

  RefPtr<txStylesheet> mStylesheet;

 private:
  txStack mReturnStack;
  txStack mLocalVarsStack;
  txStack mEvalContextStack;
  nsTArray<bool> mBoolStack;
  txStack mResultHandlerStack;
  nsTArray<RefPtr<txParameterMap>> mParamStack;
  txInstruction* mNextInstruction;
  txVariableMap* mLocalVariables;
  txVariableMap mGlobalVariableValues;
  RefPtr<txAExprResult> mGlobalVarPlaceholderValue;
  int32_t mRecursionDepth;

  AutoTArray<TemplateRule, 10> mTemplateRules;

  txIEvalContext* mEvalContext;
  txIEvalContext* mInitialEvalContext;
  // Document* mRTFDocument;
  txOwningExpandedNameMap<txIGlobalParameter>* mGlobalParams;

  txLoadedDocumentsHash mLoadedDocuments;
  txKeyHash mKeyHash;
  RefPtr<txResultRecycler> mRecycler;
  bool mDisableLoads;
  bool mStopProcessing = false;

  static const int32_t kMaxRecursionDepth;
};

#endif