// Copyright 2015 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.

#include "content/browser/renderer_host/input/touch_selection_controller_client_aura.h"

#include <set>

#include "base/macros.h"
#include "content/browser/renderer_host/render_widget_host_delegate.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_view_aura.h"
#include "content/common/view_messages.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/common/context_menu_params.h"
#include "ui/aura/client/cursor_client.h"
#include "ui/aura/client/screen_position_client.h"
#include "ui/aura/env.h"
#include "ui/aura/window.h"
#include "ui/base/clipboard/clipboard.h"
#include "ui/events/event_observer.h"
#include "ui/gfx/geometry/point_conversions.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/strings/grit/ui_strings.h"
#include "ui/touch_selection/touch_handle_drawable_aura.h"
#include "ui/touch_selection/touch_selection_menu_runner.h"

namespace content {
namespace {

// Delay before showing the quick menu, in milliseconds.
const int kQuickMenuDelayInMs = 100;

gfx::Rect ConvertRectToScreen(aura::Window* window, const gfx::RectF& rect) {
  gfx::Point origin = gfx::ToRoundedPoint(rect.origin());
  gfx::Point bottom_right = gfx::ToRoundedPoint(rect.bottom_right());

  aura::Window* root_window = window->GetRootWindow();
  if (root_window) {
    aura::client::ScreenPositionClient* screen_position_client =
        aura::client::GetScreenPositionClient(root_window);
    if (screen_position_client) {
      screen_position_client->ConvertPointToScreen(window, &origin);
      screen_position_client->ConvertPointToScreen(window, &bottom_right);
    }
  }
  return gfx::Rect(origin.x(), origin.y(), bottom_right.x() - origin.x(),
                   bottom_right.y() - origin.y());
}

}  // namespace

// An aura::Env event observer that hides touch selection ui on mouse and
// keyboard events, including those targeting windows outside the client.
class TouchSelectionControllerClientAura::EnvEventObserver
    : public ui::EventObserver {
 public:
  EnvEventObserver(ui::TouchSelectionController* selection_controller,
                   aura::Window* window)
      : selection_controller_(selection_controller), window_(window) {
    // Observe certain event types sent to any event target, to hide this ui.
    aura::Env* env = aura::Env::GetInstance();
    std::set<ui::EventType> types = {ui::ET_MOUSE_PRESSED, ui::ET_MOUSE_MOVED,
                                     ui::ET_KEY_PRESSED, ui::ET_MOUSEWHEEL};
    env->AddEventObserver(this, env, types);
  }

  ~EnvEventObserver() override {
    aura::Env::GetInstance()->RemoveEventObserver(this);
  }

 private:
  // ui::EventObserver:
  void OnEvent(const ui::Event& event) override {
    DCHECK_NE(ui::TouchSelectionController::INACTIVE,
              selection_controller_->active_status());

    if (event.IsMouseEvent()) {
      // Check IsMouseEventsEnabled, except on Mus, where it's disabled on touch
      // events in this client, but not re-enabled on mouse events elsewhere.
      auto* cursor = aura::client::GetCursorClient(window_->GetRootWindow());
      if (cursor && !cursor->IsMouseEventsEnabled() &&
          aura::Env::GetInstance()->mode() != aura::Env::Mode::MUS) {
        return;
      }

      // Windows OS unhandled WM_POINTER* may be redispatched as WM_MOUSE*.
      // Avoid adjusting the handles on synthesized events or events generated
      // from touch as this can clear an active selection generated by the pen.
      if ((event.flags() & (ui::EF_IS_SYNTHESIZED | ui::EF_FROM_TOUCH)) ||
          event.AsMouseEvent()->pointer_details().pointer_type ==
              ui::EventPointerType::POINTER_TYPE_PEN) {
        return;
      }
    }

    selection_controller_->HideAndDisallowShowingAutomatically();
  }

  ui::TouchSelectionController* selection_controller_;
  aura::Window* window_;

  DISALLOW_COPY_AND_ASSIGN(EnvEventObserver);
};

TouchSelectionControllerClientAura::TouchSelectionControllerClientAura(
    RenderWidgetHostViewAura* rwhva)
    : rwhva_(rwhva),
      internal_client_(rwhva),
      active_client_(&internal_client_),
      active_menu_client_(this),
      quick_menu_timer_(
          FROM_HERE,
          base::TimeDelta::FromMilliseconds(kQuickMenuDelayInMs),
          base::Bind(&TouchSelectionControllerClientAura::ShowQuickMenu,
                     base::Unretained(this))),
      quick_menu_requested_(false),
      touch_down_(false),
      scroll_in_progress_(false),
      handle_drag_in_progress_(false),
      show_quick_menu_immediately_for_test_(false) {
  DCHECK(rwhva_);
}

TouchSelectionControllerClientAura::~TouchSelectionControllerClientAura() {
  for (auto& observer : observers_)
    observer.OnManagerWillDestroy(this);
}

void TouchSelectionControllerClientAura::OnWindowMoved() {
  UpdateQuickMenu();
}

void TouchSelectionControllerClientAura::OnTouchDown() {
  touch_down_ = true;
  UpdateQuickMenu();
}

void TouchSelectionControllerClientAura::OnTouchUp() {
  touch_down_ = false;
  UpdateQuickMenu();
}

void TouchSelectionControllerClientAura::OnScrollStarted() {
  scroll_in_progress_ = true;
  rwhva_->selection_controller()->SetTemporarilyHidden(true);
  UpdateQuickMenu();
}

void TouchSelectionControllerClientAura::OnScrollCompleted() {
  scroll_in_progress_ = false;
  active_client_->DidScroll();
  rwhva_->selection_controller()->SetTemporarilyHidden(false);
  UpdateQuickMenu();
}

bool TouchSelectionControllerClientAura::HandleContextMenu(
    const ContextMenuParams& params) {
  if ((params.source_type == ui::MENU_SOURCE_LONG_PRESS ||
       params.source_type == ui::MENU_SOURCE_LONG_TAP) &&
      params.is_editable && params.selection_text.empty() &&
      IsQuickMenuAvailable()) {
    quick_menu_requested_ = true;
    UpdateQuickMenu();
    return true;
  }

  const bool from_touch = params.source_type == ui::MENU_SOURCE_LONG_PRESS ||
                          params.source_type == ui::MENU_SOURCE_LONG_TAP ||
                          params.source_type == ui::MENU_SOURCE_TOUCH;
  if (from_touch && !params.selection_text.empty())
    return true;

  rwhva_->selection_controller()->HideAndDisallowShowingAutomatically();
  return false;
}

void TouchSelectionControllerClientAura::DidStopFlinging() {
  OnScrollCompleted();
}

void TouchSelectionControllerClientAura::UpdateClientSelectionBounds(
    const gfx::SelectionBound& start,
    const gfx::SelectionBound& end) {
  UpdateClientSelectionBounds(start, end, &internal_client_, this);
}

void TouchSelectionControllerClientAura::UpdateClientSelectionBounds(
    const gfx::SelectionBound& start,
    const gfx::SelectionBound& end,
    ui::TouchSelectionControllerClient* client,
    ui::TouchSelectionMenuClient* menu_client) {
  if (client != active_client_ &&
      (start.type() == gfx::SelectionBound::EMPTY || !start.visible()) &&
      (end.type() == gfx::SelectionBound::EMPTY || !end.visible()) &&
      (manager_selection_start_.type() != gfx::SelectionBound::EMPTY ||
       manager_selection_end_.type() != gfx::SelectionBound::EMPTY)) {
    return;
  }

  active_client_ = client;
  active_menu_client_ = menu_client;
  manager_selection_start_ = start;
  manager_selection_end_ = end;
  // Notify TouchSelectionController if anything should change here. Only
  // update if the client is different and not making a change to empty, or
  // is the same client.
  GetTouchSelectionController()->OnSelectionBoundsChanged(start, end);
}

void TouchSelectionControllerClientAura::InvalidateClient(
    ui::TouchSelectionControllerClient* client) {
  DCHECK(client != &internal_client_);
  if (client == active_client_) {
    active_client_ = &internal_client_;
    active_menu_client_ = this;
  }
}

ui::TouchSelectionController*
TouchSelectionControllerClientAura::GetTouchSelectionController() {
  return rwhva_->selection_controller();
}

void TouchSelectionControllerClientAura::AddObserver(
    TouchSelectionControllerClientManager::Observer* observer) {
  observers_.AddObserver(observer);
}

void TouchSelectionControllerClientAura::RemoveObserver(
    TouchSelectionControllerClientManager::Observer* observer) {
  observers_.RemoveObserver(observer);
}

bool TouchSelectionControllerClientAura::IsQuickMenuAvailable() const {
  return ui::TouchSelectionMenuRunner::GetInstance() &&
         ui::TouchSelectionMenuRunner::GetInstance()->IsMenuAvailable(
             active_menu_client_);
}

void TouchSelectionControllerClientAura::ShowQuickMenu() {
  if (!ui::TouchSelectionMenuRunner::GetInstance())
    return;

  gfx::RectF rect = rwhva_->selection_controller()->GetRectBetweenBounds();

  // Clip rect, which is in |rwhva_|'s window's coordinate space, to client
  // bounds.
  gfx::PointF origin = rect.origin();
  gfx::PointF bottom_right = rect.bottom_right();
  auto client_bounds = gfx::RectF(rwhva_->GetNativeView()->bounds());
  origin.SetToMax(client_bounds.origin());
  bottom_right.SetToMin(client_bounds.bottom_right());
  if (origin.x() > bottom_right.x() || origin.y() > bottom_right.y())
    return;

  gfx::Vector2dF diagonal = bottom_right - origin;
  gfx::SizeF size(diagonal.x(), diagonal.y());
  gfx::RectF anchor_rect(origin, size);

  // Calculate maximum handle image size;
  gfx::SizeF max_handle_size =
      rwhva_->selection_controller()->GetStartHandleRect().size();
  max_handle_size.SetToMax(
      rwhva_->selection_controller()->GetEndHandleRect().size());

  aura::Window* parent = rwhva_->GetNativeView();
  ui::TouchSelectionMenuRunner::GetInstance()->OpenMenu(
      active_menu_client_, ConvertRectToScreen(parent, anchor_rect),
      gfx::ToRoundedSize(max_handle_size), parent->GetToplevelWindow());
}

void TouchSelectionControllerClientAura::UpdateQuickMenu() {
  bool menu_is_showing =
      ui::TouchSelectionMenuRunner::GetInstance() &&
      ui::TouchSelectionMenuRunner::GetInstance()->IsRunning();

  // Hide the quick menu if there is any. This should happen even if the menu
  // should be shown again, in order to update its location or content.
  if (menu_is_showing)
    ui::TouchSelectionMenuRunner::GetInstance()->CloseMenu();
  else
    quick_menu_timer_.Stop();

  // Start timer to show quick menu if necessary.
  if (ShouldShowQuickMenu()) {
    if (show_quick_menu_immediately_for_test_)
      ShowQuickMenu();
    else
      quick_menu_timer_.Reset();
  }
}

bool TouchSelectionControllerClientAura::SupportsAnimation() const {
  // We don't pass this to the active client, since it is assumed it will have
  // the same behaviour as the Aura client.
  return false;
}

bool TouchSelectionControllerClientAura::InternalClient::SupportsAnimation()
    const {
  NOTREACHED();
  return false;
}

void TouchSelectionControllerClientAura::SetNeedsAnimate() {
  NOTREACHED();
}

void TouchSelectionControllerClientAura::InternalClient::SetNeedsAnimate() {
  NOTREACHED();
}

void TouchSelectionControllerClientAura::MoveCaret(
    const gfx::PointF& position) {
  active_client_->MoveCaret(position);
}

void TouchSelectionControllerClientAura::InternalClient::MoveCaret(
    const gfx::PointF& position) {
  RenderWidgetHostDelegate* host_delegate = rwhva_->host()->delegate();
  if (host_delegate)
    host_delegate->MoveCaret(gfx::ToRoundedPoint(position));
}

void TouchSelectionControllerClientAura::MoveRangeSelectionExtent(
    const gfx::PointF& extent) {
  active_client_->MoveRangeSelectionExtent(extent);
}

void TouchSelectionControllerClientAura::InternalClient::
    MoveRangeSelectionExtent(const gfx::PointF& extent) {
  RenderWidgetHostDelegate* host_delegate = rwhva_->host()->delegate();
  if (host_delegate)
    host_delegate->MoveRangeSelectionExtent(gfx::ToRoundedPoint(extent));
}

void TouchSelectionControllerClientAura::SelectBetweenCoordinates(
    const gfx::PointF& base,
    const gfx::PointF& extent) {
  active_client_->SelectBetweenCoordinates(base, extent);
}

void TouchSelectionControllerClientAura::InternalClient::
    SelectBetweenCoordinates(const gfx::PointF& base,
                             const gfx::PointF& extent) {
  RenderWidgetHostDelegate* host_delegate = rwhva_->host()->delegate();
  if (host_delegate) {
    host_delegate->SelectRange(gfx::ToRoundedPoint(base),
                               gfx::ToRoundedPoint(extent));
  }
}

void TouchSelectionControllerClientAura::OnSelectionEvent(
    ui::SelectionEventType event) {
  // This function (implicitly) uses active_menu_client_, so we don't go to the
  // active view for this.
  switch (event) {
    case ui::SELECTION_HANDLES_SHOWN:
      quick_menu_requested_ = true;
      FALLTHROUGH;
    case ui::INSERTION_HANDLE_SHOWN:
      UpdateQuickMenu();
      env_event_observer_ = std::make_unique<EnvEventObserver>(
          rwhva_->selection_controller(), rwhva_->GetNativeView());
      break;
    case ui::SELECTION_HANDLES_CLEARED:
    case ui::INSERTION_HANDLE_CLEARED:
      env_event_observer_.reset();
      quick_menu_requested_ = false;
      UpdateQuickMenu();
      break;
    case ui::SELECTION_HANDLE_DRAG_STARTED:
    case ui::INSERTION_HANDLE_DRAG_STARTED:
      handle_drag_in_progress_ = true;
      UpdateQuickMenu();
      break;
    case ui::SELECTION_HANDLE_DRAG_STOPPED:
    case ui::INSERTION_HANDLE_DRAG_STOPPED:
      handle_drag_in_progress_ = false;
      UpdateQuickMenu();
      break;
    case ui::SELECTION_HANDLES_MOVED:
    case ui::INSERTION_HANDLE_MOVED:
      UpdateQuickMenu();
      break;
    case ui::INSERTION_HANDLE_TAPPED:
      quick_menu_requested_ = !quick_menu_requested_;
      UpdateQuickMenu();
      break;
  }
}

void TouchSelectionControllerClientAura::InternalClient::OnSelectionEvent(
    ui::SelectionEventType event) {
  NOTREACHED();
}

void TouchSelectionControllerClientAura::OnDragUpdate(
    const gfx::PointF& position) {}

void TouchSelectionControllerClientAura::InternalClient::OnDragUpdate(
    const gfx::PointF& position) {
  NOTREACHED();
}

std::unique_ptr<ui::TouchHandleDrawable>
TouchSelectionControllerClientAura::CreateDrawable() {
  // This function is purely related to the top-level view's window, so it
  // is always handled here and never in
  // TouchSelectionControllerClientChildFrame.
  return std::unique_ptr<ui::TouchHandleDrawable>(
      new ui::TouchHandleDrawableAura(rwhva_->GetNativeView()));
}

void TouchSelectionControllerClientAura::DidScroll() {}

std::unique_ptr<ui::TouchHandleDrawable>
TouchSelectionControllerClientAura::InternalClient::CreateDrawable() {
  NOTREACHED();
  return nullptr;
}

// Since the top-level client can only ever have its selection position changed
// by a mainframe scroll, or an actual change in the selection, and since both
// of these will initiate a compositor frame and thus the regular update
// process, there is nothing to do here.
void TouchSelectionControllerClientAura::InternalClient::DidScroll() {}

bool TouchSelectionControllerClientAura::IsCommandIdEnabled(
    int command_id) const {
  bool editable = rwhva_->GetTextInputType() != ui::TEXT_INPUT_TYPE_NONE;
  bool readable = rwhva_->GetTextInputType() != ui::TEXT_INPUT_TYPE_PASSWORD;
  bool has_selection = !rwhva_->GetSelectedText().empty();
  switch (command_id) {
    case IDS_APP_CUT:
      return editable && readable && has_selection;
    case IDS_APP_COPY:
      return readable && has_selection;
    case IDS_APP_PASTE: {
      base::string16 result;
      ui::Clipboard::GetForCurrentThread()->ReadText(
          ui::CLIPBOARD_TYPE_COPY_PASTE, &result);
      return editable && !result.empty();
    }
    default:
      return false;
  }
}

void TouchSelectionControllerClientAura::ExecuteCommand(int command_id,
                                                        int event_flags) {
  rwhva_->selection_controller()->HideAndDisallowShowingAutomatically();
  RenderWidgetHostDelegate* host_delegate = rwhva_->host()->delegate();
  if (!host_delegate)
    return;

  switch (command_id) {
    case IDS_APP_CUT:
      host_delegate->Cut();
      break;
    case IDS_APP_COPY:
      host_delegate->Copy();
      break;
    case IDS_APP_PASTE:
      host_delegate->Paste();
      break;
    default:
      NOTREACHED();
      break;
  }
}

void TouchSelectionControllerClientAura::RunContextMenu() {
  gfx::RectF anchor_rect =
      rwhva_->selection_controller()->GetRectBetweenBounds();
  gfx::PointF anchor_point =
      gfx::PointF(anchor_rect.CenterPoint().x(), anchor_rect.y());
  RenderWidgetHostImpl* host = rwhva_->host();
  host->ShowContextMenuAtPoint(gfx::ToRoundedPoint(anchor_point),
                               ui::MENU_SOURCE_TOUCH_EDIT_MENU);

  // Hide selection handles after getting rect-between-bounds from touch
  // selection controller; otherwise, rect would be empty and the above
  // calculations would be invalid.
  rwhva_->selection_controller()->HideAndDisallowShowingAutomatically();
}

bool TouchSelectionControllerClientAura::ShouldShowQuickMenu() {
  return quick_menu_requested_ && !touch_down_ && !scroll_in_progress_ &&
         !handle_drag_in_progress_ && IsQuickMenuAvailable();
}

base::string16 TouchSelectionControllerClientAura::GetSelectedText() {
  return rwhva_->GetSelectedText();
}

}  // namespace content
