#!/usr/bin/evn python
# -*- coding: utf-8 -*-

from .command import Command

class TouchActions(object):
    """
    Generate touch actions. Works like ActionChains; actions are stored in the
    TouchActions object and are fired with perform().
    """

    def __init__(self, driver):
        """
        Creates a new TouchActions object.

        :Args:
         - driver: The WebDriver instance which performs user actions.
           It should be with touchscreen enabled.
        """
        self._driver = driver
        self._actions = []

    def perform(self):
        """
        Performs all stored actions.
        """
        for action in self._actions:
            action()

    def tap(self, on_element):
        """
        Taps on a given element.

        :Args:
         - on_element: The element to tap.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.SINGLE_TAP, {'element': on_element.id}))
        return self

    def double_tap(self, on_element):
        """
        Double taps on a given element.

        :Args:
         - on_element: The element to tap.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.DOUBLE_TAP, {'element': on_element.id}))
        return self

    def tap_and_hold(self, xcoord, ycoord):
        """
        Touch down at given coordinates.

        :Args:
         - xcoord: X Coordinate to touch down.
         - ycoord: Y Coordinate to touch down.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.TOUCH_DOWN, {
                'x': int(xcoord),
                'y': int(ycoord)}))
        return self

    def move(self, xcoord, ycoord):
        """
        Move held tap to specified location.

        :Args:
         - xcoord: X Coordinate to move.
         - ycoord: Y Coordinate to move.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.TOUCH_MOVE, {
                'x': int(xcoord),
                'y': int(ycoord)}))
        return self

    def release(self, xcoord, ycoord):
        """
        Release previously issued tap 'and hold' command at specified location.

        :Args:
         - xcoord: X Coordinate to release.
         - ycoord: Y Coordinate to release.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.TOUCH_UP, {
                'x': int(xcoord),
                'y': int(ycoord)}))
        return self

    def scroll(self, xoffset, yoffset):
        """
        Touch and scroll, moving by xoffset and yoffset.

        :Args:
         - xoffset: X offset to scroll to.
         - yoffset: Y offset to scroll to.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.TOUCH_SCROLL, {
                'xoffset': int(xoffset),
                'yoffset': int(yoffset)}))
        return self

    def scroll_from_element(self, on_element, xoffset, yoffset):
        """
        Touch and scroll starting at on_element, moving by xoffset and yoffset.

        :Args:
         - on_element: The element where scroll starts.
         - xoffset: X offset to scroll to.
         - yoffset: Y offset to scroll to.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.TOUCH_SCROLL, {
                'element': on_element.id,
                'xoffset': int(xoffset),
                'yoffset': int(yoffset)}))
        return self

    def long_press(self, on_element):
        """
        Long press on an element.

        :Args:
         - on_element: The element to long press.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.LONG_PRESS, {'element': on_element.id}))
        return self

    def flick(self, xspeed, yspeed):
        """
        Flicks, starting anywhere on the screen.

        :Args:
         - xspeed: The X speed in pixels per second.
         - yspeed: The Y speed in pixels per second.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.FLICK, {
                'xspeed': int(xspeed),
                'yspeed': int(yspeed)}))
        return self

    def flick_element(self, on_element, xoffset, yoffset, speed):
        """
        Flick starting at on_element, and moving by the xoffset and yoffset
        with specified speed.

        :Args:
         - on_element: Flick will start at center of element.
         - xoffset: X offset to flick to.
         - yoffset: Y offset to flick to.
         - speed: Pixels per second to flick.
        """
        self._actions.append(lambda:
            self._driver.execute(Command.FLICK, {
                'element': on_element.id,
                'xoffset': int(xoffset),
                'yoffset': int(yoffset),
                'speed': int(speed)}))
        return self

    # Context manager so TouchActions can be used in a 'with .. as' statements.
    def __enter__(self):
        return self # Return created instance of self.

    def __exit__(self, _type, _value, _traceback):
        pass # Do nothing, does not require additional cleanup.
