import threading
import unittest as ut

import numpy as np

import cvpubsubs.webcam_pub as w
from cvpubsubs.window_sub import SubscriberWindows
from cvpubsubs.window_sub.winctrl import WinCtrl

if False:
    import numpy as np


def print_keys_thread():
    sub_key = WinCtrl.key_pub.make_sub()
    sub_cmd = WinCtrl.win_cmd_pub.make_sub()
    sub_cmd.return_on_no_data = ''
    msg_cmd = ''
    while msg_cmd != 'quit':
        key_chr = sub_key.get(sub_key)  # type: np.ndarray
        WinCtrl.key_pub.publish(None)  # consume data
        if key_chr is not None:
            print("key pressed: " + str(key_chr))
        msg_cmd = sub_cmd.get()
    WinCtrl.quit(force_all_read=False)


def start_print_keys_thread():  # type: (...) -> threading.Thread
    t = threading.Thread(target=print_keys_thread, args=())
    t.start()
    return t


class TestSubWin(ut.TestCase):

    def test_sub(self):
        w.VideoHandlerThread().display()

    def test_image(self):
        img = np.random.uniform(0, 1, (300, 300, 3))
        w.VideoHandlerThread(video_source=img).display()

    def test_image_args(self):
        img = np.random.uniform(0, 1, (30, 30, 3))
        w.VideoHandlerThread(video_source=img, request_size=(300, -1)).display()

    def test_sub_with_args(self):
        video_thread = w.VideoHandlerThread(video_source=0,
                                            callbacks=w.display_callbacks,
                                            request_size=(800, 600),
                                            high_speed=False,
                                            fps_limit=8
                                            )

        video_thread.display()

    def test_sub_with_callback(self):
        def redden_frame_print_spam(frame, cam_id):
            frame[:, :, 0] = 0
            frame[:, :, 2] = 0

        w.VideoHandlerThread(callbacks=redden_frame_print_spam).display()

    def test_multi_cams_one_source(self):
        def cam_handler(frame, cam_id):
            SubscriberWindows.set_global_frame_dict(cam_id, frame, frame)

        t = w.VideoHandlerThread(0, [cam_handler],
                                 request_size=(1280, 720),
                                 high_speed=True,
                                 fps_limit=240
                                 )

        t.start()

        SubscriberWindows(window_names=['cammy', 'cammy2'],
                          video_sources=[str(0)]
                          ).loop()

        t.join()

    @ut.skip("I don't have stereo cams... :(")
    def test_multi_cams_multi_source(self):
        t1 = w.VideoHandlerThread(0, request_size=(1920, 1080))
        t2 = w.VideoHandlerThread(1, request_size=(1920, 1080))

        t1.start()
        t2.start()

        SubscriberWindows(window_names=['cammy', 'cammy2'],
                          video_sources=[0, 1]
                          ).loop()

        t1.join()
        t1.join()

    def test_nested_frames(self):
        def nest_frame(frame, cam_id):
            frame = np.asarray([[[[[[frame]]]]], [[[[[frame]]], [[[frame]]]]]])
            return frame

        v = w.VideoHandlerThread(callbacks=[nest_frame] + w.display_callbacks)
        v.start()

        SubscriberWindows(window_names=[str(i) for i in range(3)],
                          video_sources=[str(0)]
                          ).loop()

        v.join()

    def test_conway_life(self):
        from cvpubsubs.webcam_pub import VideoHandlerThread
        from cvpubsubs.webcam_pub.callbacks import function_display_callback
        img = np.zeros((50, 50, 1))
        img[0:5, 0:5, :] = 1

        def conway(array, coords, finished):
            neighbors = np.sum(array[max(coords[0] - 1, 0):min(coords[0] + 2, 50),
                               max(coords[1] - 1, 0):min(coords[1] + 2, 50)])
            neighbors = max(neighbors - np.sum(array[coords[0:2]]), 0.0)
            if array[coords] == 1.0:
                if neighbors < 2 or neighbors > 3:
                    array[coords] = 0.0
                elif 2 <= neighbors <= 3:
                    array[coords] = 1.0
            else:
                if neighbors == 3:
                    array[coords] = 1.0

        VideoHandlerThread(video_source=img, callbacks=function_display_callback(conway)).display()