#ifndef __COMFORTABLE_SWIPE__gesture_swipe_gesture__
#define __COMFORTABLE_SWIPE__gesture_swipe_gesture__

/*
Comfortable Swipe
by Rico Tiongson

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "swipe_gesture.h"
#include <iostream> // std::cout, std::endl
#include <regex>    // std::regex, std::regex_match, std::cmatch
#include <string>   // std::stoi, std::stof

extern "C" {
#include <xdo.h> // xdo, xdo_new, xdo_free,
                 // xdo_get_mouse_location
                 // CURRENT_WINDOW
}

namespace comfortable_swipe::gesture {
/**
 * Constructs a new fresh swipe gesture container.
 */
swipe_gesture::swipe_gesture()
    : // construct our superclass
      comfortable_swipe::gesture::xdo_gesture(), flag_swiping(false) {
  // improve responsiveness of first gesture by pre-empting xdotool
  xdo_get_mouse_location(this->xdo, &this->ix, &this->iy, &this->screen_num);
}

/**
 * Destructs this swipe gesture.
 */
swipe_gesture::~swipe_gesture() {}

/**
 * Hook on begin of swipe gesture (you can override this).
 */
void swipe_gesture::begin() {
  // save current screen location for gestured mouse movement
  xdo_get_mouse_location(this->xdo, &this->ix, &this->iy, &this->screen_num);
  this->x = 0;
  this->y = 0;
  this->ux = 0;
  this->uy = 0;
}

/**
 * Hook on update of swipe gesture (you can override this).
 */
void swipe_gesture::update() {
  this->x += this->dx;
  this->y += this->dy;
  this->ux += this->udx;
  this->uy += this->udy;
}

/**
 * Hook on end of swipe gesture (you can override this).
 */
void swipe_gesture::end() {}

/**
 * Dispatches begin/update/end depending on the regex pattern provided by this
 * class.
 *
 * @param line  the line from libinput debug-events to parse
 * @return true if begin/update/end was dispatched
 */
bool swipe_gesture::parse_line(const char *line) {

  // prepare regex matchers statically (will only load at most once)
  static const std::regex gesture_swipe_begin(
      swipe_gesture::GESTURE_BEGIN_REGEX_PATTERN),
      gesture_swipe_update(swipe_gesture::GESTURE_UPDATE_REGEX_PATTERN),
      gesture_swipe_end(swipe_gesture::GESTURE_END_REGEX_PATTERN);

  // prepare holder for regex matches
  static std::cmatch matches;

  if (this->flag_swiping) {
    // currently swiping
    if (std::regex_match(line, matches, gesture_swipe_update) != 0) {
      // assign necessary variables for swipe update
      this->fingers = std::stoi(matches[1]);
      this->dx = std::stof(matches[2]);
      this->dy = std::stof(matches[3]);
      this->udx = std::stof(matches[4]);
      this->udy = std::stof(matches[5]);
      // dispatch update
      this->update();
      return true;
    } else if (std::regex_match(line, matches, gesture_swipe_end) != 0) {
      // assign necessary variables for swipe end
      this->flag_swiping = false;
      this->fingers = std::stoi(matches[1]);
      // dispatch end
      this->end();
      return true;
    }
  } else {
    // not swiping, check if swipe will begin
    if (std::regex_match(line, matches, gesture_swipe_begin) != 0 ||
        std::regex_match(line, matches, gesture_swipe_update) != 0) {
      // assign necessary variables for swipe begin
      this->flag_swiping = true;
      this->fingers = std::stoi(matches[1]);
      // dispatch begin
      this->begin();
      return true;
    }
  }

  return false;
}
} // namespace comfortable_swipe::gesture

#endif /* __COMFORTABLE_SWIPE__gesture_swipe_gesture__ */