// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_
#define COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_

#include <set>
#include <vector>

#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "components/autofill/content/renderer/form_cache.h"
#include "components/autofill/content/renderer/page_click_listener.h"
#include "content/public/renderer/render_frame_observer.h"
#include "content/public/renderer/render_view_observer.h"
#include "third_party/WebKit/public/web/WebAutofillClient.h"
#include "third_party/WebKit/public/web/WebFormControlElement.h"
#include "third_party/WebKit/public/web/WebFormElement.h"
#include "third_party/WebKit/public/web/WebInputElement.h"

namespace blink {
class WebNode;
class WebView;
}

namespace autofill {

struct FormData;
struct FormFieldData;
class PasswordAutofillAgent;
class PasswordGenerationAgent;

// AutofillAgent deals with Autofill related communications between WebKit and
// the browser.  There is one AutofillAgent per RenderFrame.
// Note that Autofill encompasses:
// - single text field suggestions, that we usually refer to as Autocomplete,
// - password form fill, refered to as Password Autofill, and
// - entire form fill based on one field entry, referred to as Form Autofill.

class AutofillAgent : public content::RenderFrameObserver,
                      public PageClickListener,
                      public blink::WebAutofillClient {
 public:
  // PasswordAutofillAgent is guaranteed to outlive AutofillAgent.
  // PasswordGenerationAgent may be NULL. If it is not, then it is also
  // guaranteed to outlive AutofillAgent.
  AutofillAgent(content::RenderFrame* render_frame,
                PasswordAutofillAgent* password_autofill_manager,
                PasswordGenerationAgent* password_generation_agent);
  ~AutofillAgent() override;

 private:
  // Functor used as a simplified comparison function for FormData. Only
  // compares forms at a high level (notably name, origin, action).
  struct FormDataCompare {
    bool operator()(const FormData& lhs, const FormData& rhs) const;
  };

  // Thunk class for RenderViewObserver methods that haven't yet been migrated
  // to RenderFrameObserver. Should eventually be removed.
  // http://crbug.com/433486
  class LegacyAutofillAgent : public content::RenderViewObserver {
   public:
    LegacyAutofillAgent(content::RenderView* render_view, AutofillAgent* agent);
    ~LegacyAutofillAgent() override;

   private:
    // content::RenderViewObserver:
    void OnDestruct() override;
    void FocusChangeComplete() override;

    AutofillAgent* agent_;

    DISALLOW_COPY_AND_ASSIGN(LegacyAutofillAgent);
  };
  friend class LegacyAutofillAgent;

  // Flags passed to ShowSuggestions.
  struct ShowSuggestionsOptions {
    // All fields are default initialized to false.
    ShowSuggestionsOptions();

    // Specifies that suggestions should be shown when |element| contains no
    // text.
    bool autofill_on_empty_values;

    // Specifies that suggestions should be shown when the caret is not
    // after the last character in the element.
    bool requires_caret_at_end;

    // Specifies that all of <datalist> suggestions and no autofill suggestions
    // are shown. |autofill_on_empty_values| and |requires_caret_at_end| are
    // ignored if |datalist_only| is true.
    bool datalist_only;

    // Specifies that all autofill suggestions should be shown and none should
    // be elided because of the current value of |element| (relevant for inline
    // autocomplete).
    bool show_full_suggestion_list;

    // Specifies that only show a suggestions box if |element| is part of a
    // password form, otherwise show no suggestions.
    bool show_password_suggestions_only;
  };

  // content::RenderFrameObserver:
  bool OnMessageReceived(const IPC::Message& message) override;
  void DidCommitProvisionalLoad(bool is_new_navigation,
                                bool is_same_page_navigation) override;
  void DidFinishDocumentLoad() override;
  void WillSendSubmitEvent(const blink::WebFormElement& form) override;
  void WillSubmitForm(const blink::WebFormElement& form) override;
  void DidChangeScrollOffset() override;
  void FocusedNodeChanged(const blink::WebNode& node) override;

  // Pass-through from LegacyAutofillAgent. This correlates with the
  // RenderViewObserver method.
  void FocusChangeComplete();

  // PageClickListener:
  void FormControlElementClicked(const blink::WebFormControlElement& element,
                                 bool was_focused) override;

  // blink::WebAutofillClient:
  void textFieldDidEndEditing(const blink::WebInputElement& element) override;
  void textFieldDidChange(const blink::WebFormControlElement& element) override;
  void textFieldDidReceiveKeyDown(
      const blink::WebInputElement& element,
      const blink::WebKeyboardEvent& event) override;
  void didRequestAutocomplete(const blink::WebFormElement& form) override;
  void setIgnoreTextChanges(bool ignore) override;
  void didAssociateFormControls(
      const blink::WebVector<blink::WebNode>& nodes) override;
  void openTextDataListChooser(const blink::WebInputElement& element) override;
  void dataListOptionsChanged(const blink::WebInputElement& element) override;
  void firstUserGestureObserved() override;
  void ajaxSucceeded() override;

  void OnFieldTypePredictionsAvailable(
      const std::vector<FormDataPredictions>& forms);
  void OnFillForm(int query_id, const FormData& form);
  void OnFirstUserGestureObservedInTab();
  void OnPing();
  void OnPreviewForm(int query_id, const FormData& form);

  // For external Autofill selection.
  void OnClearForm();
  void OnClearPreviewedForm();
  void OnFillFieldWithValue(const base::string16& value);
  void OnPreviewFieldWithValue(const base::string16& value);
  void OnAcceptDataListSuggestion(const base::string16& value);
  void OnFillPasswordSuggestion(const base::string16& username,
                                const base::string16& password);
  void OnPreviewPasswordSuggestion(const base::string16& username,
                                   const base::string16& password);

  // Called when a same-page navigation is detected.
  void OnSamePageNavigationCompleted();

  // Called when interactive autocomplete finishes. |message| is printed to
  // the console if non-empty.
  void OnRequestAutocompleteResult(
      blink::WebFormElement::AutocompleteResult result,
      const base::string16& message,
      const FormData& form_data);

  // Called when an autocomplete request succeeds or fails with the |result|.
  void FinishAutocompleteRequest(
      blink::WebFormElement::AutocompleteResult result);

  // Called in a posted task by textFieldDidChange() to work-around a WebKit bug
  // http://bugs.webkit.org/show_bug.cgi?id=16976
  void TextFieldDidChangeImpl(const blink::WebFormControlElement& element);

  // Shows the autofill suggestions for |element|. This call is asynchronous
  // and may or may not lead to the showing of a suggestion popup (no popup is
  // shown if there are no available suggestions).
  void ShowSuggestions(const blink::WebFormControlElement& element,
                       const ShowSuggestionsOptions& options);

  // Queries the browser for Autocomplete and Autofill suggestions for the given
  // |element|.
  void QueryAutofillSuggestions(const blink::WebFormControlElement& element);

  // Sets the element value to reflect the selected |suggested_value|.
  void AcceptDataListSuggestion(const base::string16& suggested_value);

  // Fills |form| and |field| with the FormData and FormField corresponding to
  // |node|. Returns true if the data was found; and false otherwise.
  bool FindFormAndFieldForNode(
      const blink::WebNode& node,
      FormData* form,
      FormFieldData* field) WARN_UNUSED_RESULT;

  // Set |node| to display the given |value|.
  void FillFieldWithValue(const base::string16& value,
                          blink::WebInputElement* node);

  // Set |node| to display the given |value| as a preview.  The preview is
  // visible on screen to the user, but not visible to the page via the DOM or
  // JavaScript.
  void PreviewFieldWithValue(const base::string16& value,
                             blink::WebInputElement* node);

  // Notifies browser of new fillable forms in |render_frame|.
  void ProcessForms();

  // Sends a message to the browser that the form is about to be submitted,
  // only if the particular message has not been previously submitted for the
  // form in the current frame.
  // Additionally, depending on |send_submitted_event| a message is sent to the
  // browser that the form was submitted.
  void SendFormEvents(const blink::WebFormElement& form,
                      bool send_submitted_event);

  // Hides any currently showing Autofill popup.
  void HidePopup();

  // Returns true if the text field change is due to a user gesture. Can be
  // overriden in tests.
  virtual bool IsUserGesture() const;

  // Formerly cached forms for all frames, now only caches forms for the current
  // frame.
  FormCache form_cache_;

  // Keeps track of the forms for which a "will submit" message has been sent in
  // this frame's current load. We use a simplified comparison function.
  std::set<FormData, FormDataCompare> submitted_forms_;

  PasswordAutofillAgent* password_autofill_agent_;  // Weak reference.
  PasswordGenerationAgent* password_generation_agent_;  // Weak reference.

  // Passes through RenderViewObserver methods to |this|.
  LegacyAutofillAgent legacy_;

  // The ID of the last request sent for form field Autofill.  Used to ignore
  // out of date responses.
  int autofill_query_id_;

  // The element corresponding to the last request sent for form field Autofill.
  blink::WebFormControlElement element_;

  // The form element currently requesting an interactive autocomplete.
  blink::WebFormElement in_flight_request_form_;

  // Last form which was interacted with by the user.
  blink::WebFormElement last_interacted_form_;

  // Was the query node autofilled prior to previewing the form?
  bool was_query_node_autofilled_;

  // Have we already shown Autofill suggestions for the field the user is
  // currently editing?  Used to keep track of state for metrics logging.
  bool has_shown_autofill_popup_for_current_edit_;

  // Whether or not to ignore text changes.  Useful for when we're committing
  // a composition when we are defocusing the WebView and we don't want to
  // trigger an autofill popup to show.
  bool ignore_text_changes_;

  // Whether the Autofill popup is possibly visible.  This is tracked as a
  // performance improvement, so that the IPC channel isn't flooded with
  // messages to close the Autofill popup when it can't possibly be showing.
  bool is_popup_possibly_visible_;

  // If the generation popup is possibly visible. This is tracked to prevent
  // generation UI from displaying at the same time as password manager UI.
  // This is needed because generation is shown on field focus vs. field click
  // for the password manager. TODO(gcasto): Have both UIs show on focus.
  bool is_generation_popup_possibly_visible_;

  base::WeakPtrFactory<AutofillAgent> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(AutofillAgent);
};

}  // namespace autofill

#endif  // COMPONENTS_AUTOFILL_CONTENT_RENDERER_AUTOFILL_AGENT_H_