from kivy.tests.common import GraphicUnitTest

from kivy.uix.gridlayout import GridLayout
from kivy.uix.scrollview import ScrollView
from kivy.uix.label import Label
from kivy.base import EventLoop
from kivy.clock import Clock
from kivy.tests.common import UTMotionEvent

from time import sleep
from itertools import count

DEBUG = False
touch_id = count()


class _TestGrid(GridLayout):
    def __init__(self, **kwargs):
        kwargs['cols'] = 1
        kwargs['spacing'] = 10
        kwargs['size_hint'] = (None, None)
        super(_TestGrid, self).__init__(**kwargs)
        self.bind(minimum_height=self.setter('height'))
        self.bind(minimum_width=self.setter('width'))

        for i in range(10):
            self.add_widget(Label(
                size_hint=(None, None),
                height=100, width=1000,
                text=str(i)
            ))


class _TestScrollbarHorizontal(ScrollView):
    def __init__(self, **kwargs):
        kwargs['scroll_type'] = ["bars"]
        kwargs['bar_width'] = 20
        kwargs['do_scroll_y'] = False
        super(_TestScrollbarHorizontal, self).__init__(**kwargs)


class _TestScrollbarVertical(ScrollView):
    def __init__(self, **kwargs):
        kwargs['scroll_type'] = ["bars"]
        kwargs['bar_width'] = 20
        kwargs['do_scroll_x'] = False
        super(_TestScrollbarVertical, self).__init__(**kwargs)


class _TestScrollbarBoth(ScrollView):
    def __init__(self, **kwargs):
        kwargs['scroll_type'] = ["bars"]
        kwargs['bar_width'] = 20
        super(_TestScrollbarBoth, self).__init__(**kwargs)


class _TestScrollbarHorizontalMargin(ScrollView):
    def __init__(self, **kwargs):
        kwargs['scroll_type'] = ["bars"]
        kwargs['bar_margin'] = 40
        kwargs['bar_width'] = 20
        kwargs['do_scroll_y'] = False
        super(_TestScrollbarHorizontalMargin, self).__init__(**kwargs)


class _TestScrollbarVerticalMargin(ScrollView):
    def __init__(self, **kwargs):
        kwargs['scroll_type'] = ["bars"]
        kwargs['bar_margin'] = 40
        kwargs['bar_width'] = 20
        kwargs['do_scroll_x'] = False
        super(_TestScrollbarVerticalMargin, self).__init__(**kwargs)


class _TestScrollbarBothMargin(ScrollView):
    def __init__(self, **kwargs):
        kwargs['scroll_type'] = ["bars"]
        kwargs['bar_margin'] = 40
        kwargs['bar_width'] = 20
        super(_TestScrollbarBothMargin, self).__init__(**kwargs)


class ScrollViewTestCase(GraphicUnitTest):
    framecount = 0

    def process_points(self, scroll, points):
        win = EventLoop.window
        dt = 0.02

        for point in points:
            if DEBUG:
                print('point:', point, scroll.scroll_x, scroll.scroll_y)
                Clock.schedule_once(lambda *dt: sleep(0.5), 0)
                self.render(scroll)

            x, y, nx, ny, pos_x, pos_y, border_check = point
            scroll.bar_pos = (pos_x, pos_y)

            touch = UTMotionEvent("unittest", next(touch_id), {
                "x": x / float(win.width),
                "y": y / float(win.height),
            })

            # we start with the default top-left corner
            self.assertAlmostEqual(scroll.scroll_x, 0.0, delta=dt)
            self.assertAlmostEqual(scroll.scroll_y, 1.0, delta=dt)

            # check the collision with the margin empty area
            if border_check:
                EventLoop.post_dispatch_input("begin", touch)
                touch.move({
                    "x": nx / float(win.width),
                    "y": ny / float(win.height)
                })
                EventLoop.post_dispatch_input("update", touch)
                EventLoop.post_dispatch_input("end", touch)

                self.assertAlmostEqual(scroll.scroll_x, 0.0, delta=dt)
                self.assertAlmostEqual(scroll.scroll_y, 1.0, delta=dt)
                return

            EventLoop.post_dispatch_input("begin", touch)
            touch.move({
                "x": nx / float(win.width),
                "y": ny / float(win.height)
            })
            EventLoop.post_dispatch_input("update", touch)
            EventLoop.post_dispatch_input("end", touch)

            if DEBUG:
                print(scroll.scroll_x, scroll.scroll_y)
                Clock.schedule_once(lambda *dt: sleep(0.5), 0)
                self.render(scroll)

            # check the scroll position
            self.assertAlmostEqual(
                scroll.scroll_x, 0.0 if x == nx else 1.0,
                delta=dt
            )
            self.assertAlmostEqual(
                scroll.scroll_y, 1.0 if y == ny else 0.0,
                delta=dt
            )

            # reset scroll to original state
            scroll.scroll_x = 0.0
            scroll.scroll_y = 1.0

    def test_scrollbar_horizontal(self):
        EventLoop.ensure_window()
        win = EventLoop.window
        grid = _TestGrid()
        scroll = _TestScrollbarHorizontal()
        scroll.add_widget(grid)
        win.add_widget(scroll)

        # get widgets ready
        EventLoop.idle()

        left, right = scroll.to_window(scroll.x, scroll.right)
        bottom, top = scroll.to_window(scroll.y, scroll.top)

        points = [
            [left, bottom, right, bottom, 'bottom', 'right', False],
            [left, top, right, top, 'top', 'right', False]
        ]
        self.process_points(scroll, points)
        self.render(scroll)

    def test_scrollbar_vertical(self):
        EventLoop.ensure_window()
        win = EventLoop.window
        grid = _TestGrid()
        scroll = _TestScrollbarVertical()
        scroll.add_widget(grid)
        win.add_widget(scroll)

        # get widgets ready
        EventLoop.idle()

        left, right = scroll.to_window(scroll.x, scroll.right)
        bottom, top = scroll.to_window(scroll.y, scroll.top)

        points = [
            [right, top, right, bottom, 'bottom', 'right', False],
            [left, top, left, bottom, 'bottom', 'left', False]
        ]
        self.process_points(scroll, points)
        self.render(scroll)

    def test_scrollbar_both(self):
        EventLoop.ensure_window()
        win = EventLoop.window
        grid = _TestGrid()
        scroll = _TestScrollbarBoth()
        scroll.add_widget(grid)
        win.add_widget(scroll)

        # get widgets ready
        EventLoop.idle()

        left, right = scroll.to_window(scroll.x, scroll.right)
        bottom, top = scroll.to_window(scroll.y, scroll.top)

        points = [
            [left, bottom, right, bottom, 'bottom', 'right', False],
            [left, top, right, top, 'top', 'right', False],
            [right, top, right, bottom, 'bottom', 'right', False],
            [left, top, left, bottom, 'bottom', 'left', False]
        ]
        self.process_points(scroll, points)
        self.render(scroll)

    def test_scrollbar_horizontal_margin(self):
        EventLoop.ensure_window()
        win = EventLoop.window
        grid = _TestGrid()
        scroll = _TestScrollbarHorizontalMargin()
        margin = scroll.bar_margin
        scroll.add_widget(grid)
        win.add_widget(scroll)

        # get widgets ready
        EventLoop.idle()

        left, right = scroll.to_window(scroll.x, scroll.right)
        bottom, top = scroll.to_window(scroll.y, scroll.top)

        # touch in the half of the bar
        m = margin + scroll.bar_width / 2.0
        points = [
            [left, bottom + m, right, bottom + m, 'bottom', 'right', False],
            [left, top - m, right, top - m, 'top', 'right', False],
            [left, bottom, right, bottom, 'bottom', 'right', True],
            [left, top, right, top, 'top', 'right', True]
        ]
        self.process_points(scroll, points)
        self.render(scroll)

    def test_scrollbar_vertical_margin(self):
        EventLoop.ensure_window()
        win = EventLoop.window
        grid = _TestGrid()
        scroll = _TestScrollbarVerticalMargin()
        margin = scroll.bar_margin
        scroll.add_widget(grid)
        win.add_widget(scroll)

        # get widgets ready
        EventLoop.idle()

        left, right = scroll.to_window(scroll.x, scroll.right)
        bottom, top = scroll.to_window(scroll.y, scroll.top)

        # touch in the half of the bar
        m = margin + scroll.bar_width / 2.0
        points = [
            [right - m, top, right - m, bottom, 'bottom', 'right', False],
            [left + m, top, left + m, bottom, 'bottom', 'left', False],
            [right, top, right, bottom, 'bottom', 'right', True],
            [left, top, left, bottom, 'bottom', 'left', True]
        ]
        self.process_points(scroll, points)
        self.render(scroll)

    def test_scrollbar_both_margin(self):
        EventLoop.ensure_window()
        win = EventLoop.window
        grid = _TestGrid()
        scroll = _TestScrollbarBothMargin()
        margin = scroll.bar_margin
        scroll.add_widget(grid)
        win.add_widget(scroll)

        # get widgets ready
        EventLoop.idle()

        left, right = scroll.to_window(scroll.x, scroll.right)
        bottom, top = scroll.to_window(scroll.y, scroll.top)

        # touch in the half of the bar
        m = margin + scroll.bar_width / 2.0
        points = [
            [left, bottom + m, right, bottom + m, 'bottom', 'right', False],
            [left, top - m, right, top - m, 'top', 'right', False],
            [right - m, top, right - m, bottom, 'bottom', 'right', False],
            [left + m, top, left + m, bottom, 'bottom', 'left', False],
            [left, bottom, right, bottom, 'bottom', 'right', True],
            [left, top, right, top, 'top', 'right', True],
            [right, top, right, bottom, 'bottom', 'right', True],
            [left, top, left, bottom, 'bottom', 'left', True]
        ]
        self.process_points(scroll, points)
        self.render(scroll)

    def test_smooth_scroll_end(self):
        EventLoop.ensure_window()
        win = EventLoop.window
        grid = _TestGrid()
        scroll = ScrollView(smooth_scroll_end=10)

        assert scroll.smooth_scroll_end == 10
        scroll.add_widget(grid)

        # XXX this shouldn't be needed, but previous tests apparently
        # don't cleanup
        while win.children:
            win.remove_widget(win.children[0])

        win.add_widget(scroll)

        # get widgets ready
        EventLoop.idle()

        e = scroll.effect_y
        assert e.velocity == 0

        touch = UTMotionEvent("unittest", next(touch_id), {
            "x": scroll.center_x / float(win.width),
            "y": scroll.center_y / float(win.height),
        })

        touch.profile.append('button')
        touch.button = 'scrollup'

        EventLoop.post_dispatch_input("begin", touch)
        # EventLoop.post_dispatch_input("update", touch)
        assert e.velocity == 10 * scroll.scroll_wheel_distance
        EventLoop.idle()
        assert 0 < e.velocity < 10 * scroll.scroll_wheel_distance
        EventLoop.post_dispatch_input("end", touch)
        EventLoop.idle()
        assert 0 < e.velocity < 10 * scroll.scroll_wheel_distance

        # wait for velocity to die off
        while e.velocity:
            EventLoop.idle()

        touch = UTMotionEvent("unittest", next(touch_id), {
            "x": scroll.center_x / float(win.width),
            "y": scroll.center_y / float(win.height),
        })
        touch.profile.append('button')
        touch.button = 'scrolldown'

        EventLoop.post_dispatch_input("begin", touch)
        # EventLoop.post_dispatch_input("update", touch)
        assert e.velocity == -10 * scroll.scroll_wheel_distance
        EventLoop.idle()
        assert 0 > e.velocity > -10 * scroll.scroll_wheel_distance
        EventLoop.post_dispatch_input("end", touch)
        EventLoop.idle()
        assert 0 > e.velocity > -10 * scroll.scroll_wheel_distance


if __name__ == '__main__':
    import unittest
    unittest.main()