// Copyright (c) 2014 GitHub, Inc.
// Use of this source code is governed by the MIT license that can be
// found in the LICENSE file.

#ifndef ATOM_RENDERER_API_ATOM_API_SPELL_CHECK_CLIENT_H_
#define ATOM_RENDERER_API_ATOM_API_SPELL_CHECK_CLIENT_H_

#include <memory>
#include <string>
#include <vector>

#include "base/callback.h"
#include "base/memory/weak_ptr.h"
#include "chrome/renderer/spellchecker/spellcheck_worditerator.h"
#include "native_mate/scoped_persistent.h"
#include "third_party/blink/public/platform/web_spell_check_panel_host_client.h"
#include "third_party/blink/public/platform/web_vector.h"
#include "third_party/blink/public/web/web_text_check_client.h"

namespace blink {
struct WebTextCheckingResult;
class WebTextCheckingCompletion;
}  // namespace blink

namespace atom {

namespace api {

class SpellCheckClient : public blink::WebSpellCheckPanelHostClient,
                         public blink::WebTextCheckClient,
                         public base::SupportsWeakPtr<SpellCheckClient> {
 public:
  SpellCheckClient(const std::string& language,
                   bool auto_spell_correct_turned_on,
                   v8::Isolate* isolate,
                   v8::Local<v8::Object> provider);
  ~SpellCheckClient() override;

 private:
  class SpellcheckRequest;
  // blink::WebTextCheckClient:
  void CheckSpelling(
      const blink::WebString& text,
      int& misspelledOffset,
      int& misspelledLength,
      blink::WebVector<blink::WebString>* optionalSuggestions) override;
  void RequestCheckingOfText(
      const blink::WebString& textToCheck,
      blink::WebTextCheckingCompletion* completionCallback) override;
  bool IsSpellCheckingEnabled() const override;

  // blink::WebSpellCheckPanelHostClient:
  void ShowSpellingUI(bool show) override;
  bool IsShowingSpellingUI() override;
  void UpdateSpellingUIWithMisspelledWord(
      const blink::WebString& word) override;

  struct SpellCheckScope {
    v8::HandleScope handle_scope_;
    v8::Context::Scope context_scope_;
    v8::Local<v8::Object> provider_;
    v8::Local<v8::Function> spell_check_;

    explicit SpellCheckScope(const SpellCheckClient& client);
    ~SpellCheckScope();
  };

  // Check the spelling of text.
  void SpellCheckText(const base::string16& text,
                      bool stop_at_first_result,
                      std::vector<blink::WebTextCheckingResult>* results);

  // Call JavaScript to check spelling a word.
  bool SpellCheckWord(const SpellCheckScope& scope,
                      const base::string16& word_to_check) const;

  // Returns whether or not the given word is a contraction of valid words
  // (e.g. "word:word").
  bool IsValidContraction(const SpellCheckScope& scope,
                          const base::string16& word);

  // Performs spell checking from the request queue.
  void PerformSpellCheck(SpellcheckRequest* param);

  // Represents character attributes used for filtering out characters which
  // are not supported by this SpellCheck object.
  SpellcheckCharAttribute character_attributes_;

  // Represents word iterators used in this spellchecker. The |text_iterator_|
  // splits text provided by WebKit into words, contractions, or concatenated
  // words. The |contraction_iterator_| splits a concatenated word extracted by
  // |text_iterator_| into word components so we can treat a concatenated word
  // consisting only of correct words as a correct word.
  SpellcheckWordIterator text_iterator_;
  SpellcheckWordIterator contraction_iterator_;

  // The parameters of a pending background-spellchecking request.
  // (When WebKit sends two or more requests, we cancel the previous
  // requests so we do not have to use vectors.)
  std::unique_ptr<SpellcheckRequest> pending_request_param_;

  v8::Isolate* isolate_;
  v8::Persistent<v8::Context> context_;
  mate::ScopedPersistent<v8::Object> provider_;
  mate::ScopedPersistent<v8::Function> spell_check_;

  DISALLOW_COPY_AND_ASSIGN(SpellCheckClient);
};

}  // namespace api

}  // namespace atom

#endif  // ATOM_RENDERER_API_ATOM_API_SPELL_CHECK_CLIENT_H_
