// Copyright 2014 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 "ui/events/gesture_detection/gesture_touch_uma_histogram.h"

#include "base/metrics/histogram.h"

namespace ui {

GestureTouchUMAHistogram::GestureTouchUMAHistogram()
    : max_distance_from_start_squared_(0), is_single_finger_(true) {
}

GestureTouchUMAHistogram::~GestureTouchUMAHistogram() {
}

void GestureTouchUMAHistogram::RecordGestureEvent(
    const GestureEventData& gesture) {
  UMA_HISTOGRAM_ENUMERATION(
      "Event.GestureCreated", UMAEventTypeFromEvent(gesture), UMA_ET_COUNT);
}

void GestureTouchUMAHistogram::RecordTouchEvent(const MotionEvent& event) {
  if (event.GetAction() == MotionEvent::ACTION_DOWN) {
    start_time_ = event.GetEventTime();
    start_touch_position_ = gfx::Point(event.GetX(), event.GetY());
    is_single_finger_ = true;
    max_distance_from_start_squared_ = 0;
  } else if (event.GetAction() == MotionEvent::ACTION_MOVE &&
             is_single_finger_) {
    float cur_dist = (start_touch_position_ -
                      gfx::Point(event.GetX(), event.GetY())).LengthSquared();
    if (cur_dist > max_distance_from_start_squared_)
      max_distance_from_start_squared_ = cur_dist;
  } else {
    if (event.GetAction() == MotionEvent::ACTION_UP && is_single_finger_) {
      UMA_HISTOGRAM_CUSTOM_COUNTS(
          "Event.TouchMaxDistance",
          static_cast<int>(sqrt(max_distance_from_start_squared_)),
          0,
          1500,
          50);

      base::TimeDelta duration = event.GetEventTime() - start_time_;
      UMA_HISTOGRAM_TIMES("Event.TouchDuration", duration);
    }
    is_single_finger_ = false;
  }
}

UMAEventType GestureTouchUMAHistogram::UMAEventTypeFromEvent(
    const GestureEventData& gesture) {
  switch (gesture.type()) {
    case ET_TOUCH_RELEASED:
      return UMA_ET_TOUCH_RELEASED;
    case ET_TOUCH_PRESSED:
      return UMA_ET_TOUCH_PRESSED;
    case ET_TOUCH_MOVED:
      return UMA_ET_TOUCH_MOVED;
    case ET_TOUCH_CANCELLED:
      return UMA_ET_TOUCH_CANCELLED;
    case ET_GESTURE_SCROLL_BEGIN:
      return UMA_ET_GESTURE_SCROLL_BEGIN;
    case ET_GESTURE_SCROLL_END:
      return UMA_ET_GESTURE_SCROLL_END;
    case ET_GESTURE_SCROLL_UPDATE: {
      int touch_points = gesture.details.touch_points();
      if (touch_points == 1)
        return UMA_ET_GESTURE_SCROLL_UPDATE;
      else if (touch_points == 2)
        return UMA_ET_GESTURE_SCROLL_UPDATE_2;
      else if (touch_points == 3)
        return UMA_ET_GESTURE_SCROLL_UPDATE_3;
      return UMA_ET_GESTURE_SCROLL_UPDATE_4P;
    }
    case ET_GESTURE_TAP: {
      int tap_count = gesture.details.tap_count();
      if (tap_count == 1)
        return UMA_ET_GESTURE_TAP;
      if (tap_count == 2)
        return UMA_ET_GESTURE_DOUBLE_TAP;
      if (tap_count == 3)
        return UMA_ET_GESTURE_TRIPLE_TAP;
      NOTREACHED() << "Received tap with tapcount " << tap_count;
      return UMA_ET_UNKNOWN;
    }
    case ET_GESTURE_TAP_DOWN:
      return UMA_ET_GESTURE_TAP_DOWN;
    case ET_GESTURE_BEGIN:
      return UMA_ET_GESTURE_BEGIN;
    case ET_GESTURE_END:
      return UMA_ET_GESTURE_END;
    case ET_GESTURE_TWO_FINGER_TAP:
      return UMA_ET_GESTURE_TWO_FINGER_TAP;
    case ET_GESTURE_PINCH_BEGIN:
      return UMA_ET_GESTURE_PINCH_BEGIN;
    case ET_GESTURE_PINCH_END:
      return UMA_ET_GESTURE_PINCH_END;
    case ET_GESTURE_PINCH_UPDATE: {
      int touch_points = gesture.details.touch_points();
      if (touch_points >= 4)
        return UMA_ET_GESTURE_PINCH_UPDATE_4P;
      else if (touch_points == 3)
        return UMA_ET_GESTURE_PINCH_UPDATE_3;
      return UMA_ET_GESTURE_PINCH_UPDATE;
    }
    case ET_GESTURE_LONG_PRESS:
      return UMA_ET_GESTURE_LONG_PRESS;
    case ET_GESTURE_LONG_TAP:
      return UMA_ET_GESTURE_LONG_TAP;
    case ET_GESTURE_SWIPE: {
      int touch_points = gesture.details.touch_points();
      if (touch_points == 1)
        return UMA_ET_GESTURE_SWIPE_1;
      else if (touch_points == 2)
        return UMA_ET_GESTURE_SWIPE_2;
      else if (touch_points == 3)
        return UMA_ET_GESTURE_SWIPE_3;
      return UMA_ET_GESTURE_SWIPE_4P;
    }
    case ET_GESTURE_WIN8_EDGE_SWIPE:
      return UMA_ET_GESTURE_WIN8_EDGE_SWIPE;
    case ET_GESTURE_TAP_CANCEL:
      return UMA_ET_GESTURE_TAP_CANCEL;
    case ET_GESTURE_SHOW_PRESS:
      return UMA_ET_GESTURE_SHOW_PRESS;
    case ET_SCROLL:
      return UMA_ET_SCROLL;
    case ET_SCROLL_FLING_START:
      return UMA_ET_SCROLL_FLING_START;
    case ET_SCROLL_FLING_CANCEL:
      return UMA_ET_SCROLL_FLING_CANCEL;
    case ET_GESTURE_TAP_UNCONFIRMED:
      return UMA_ET_GESTURE_TAP_UNCONFIRMED;
    case ET_GESTURE_DOUBLE_TAP:
      return UMA_ET_GESTURE_DOUBLE_TAP;
    default:
      NOTREACHED();
      return UMA_ET_UNKNOWN;
  }
}

}  //  namespace ui