"""Test for video analyser """
import os
import time
from unittest.mock import patch
from unittest.mock import MagicMock

import cv2
import numpy as np

from core.utils import VideoAnalyser


TEST_DATA_PATH = 'tests/data/'
INPUT_VIDEO_PATH = os.path.join(TEST_DATA_PATH, 'normal_side.mp4')
OUTPUT_VIDEO_PATH = os.path.join(TEST_DATA_PATH, 'test_base.mp4')


def setup_module():
    if not os.path.exists(TEST_DATA_PATH):
        os.makedirs(TEST_DATA_PATH)


def teardown_function():
    if os.path.exists(OUTPUT_VIDEO_PATH):
        os.remove(OUTPUT_VIDEO_PATH)


def gen_fake_image():
    return np.zeros((640, 320, 3), dtype=np.uint8)


class TestVideoAnalyser:
    def test_init_without_input_video_is_camera(self):
        analyser = VideoAnalyser(input_video=None)

        assert analyser.is_camera

    def test_init_with_input_video_is_not_camera(self):
        mock_video_capture = MagicMock()
        mock_video_capture.release = MagicMock()
        with patch('cv2.VideoCapture', mock_video_capture):
            analyser = VideoAnalyser(input_video=INPUT_VIDEO_PATH)

        assert not analyser.is_camera

    def test_close_with_opencv_release_resource(self):
        analyser = VideoAnalyser()
        analyser.set_output_video(output_video='output.mp4', save_with_av=False)

        analyser.close()

        assert not analyser.cap.isOpened()
        assert not analyser.out_stream

    def test_close_with_av_release_resource(self):
        mock_release_container = MagicMock()
        analyser = VideoAnalyser()
        analyser.set_output_video(output_video='output.mp4', save_with_av=True)
        analyser.release_container = mock_release_container

        analyser.close()

        assert not analyser.cap.isOpened()
        assert not analyser.container
        assert mock_release_container.called

    def test_set_output_video_with_camera_and_opencv_success(self):
        analyser = VideoAnalyser(camera_id=0)
        analyser.open_camera()
        analyser.set_output_video(output_video='output.mp4', save_with_av=False)

        assert analyser.out_stream

    def test_set_output_video_with_camera_and_av_success(self):
        analyser = VideoAnalyser(camera_id=0)
        analyser.open_camera()
        analyser.set_output_video(output_video='output.mp4', save_with_av=True)

        assert analyser.stream
        assert analyser.container

    def test_set_output_video_with_video_and_opencv_success(self):
        analyser = VideoAnalyser(input_video=INPUT_VIDEO_PATH)
        analyser.set_output_video(output_video='output.mp4', save_with_av=False)

        assert analyser.out_stream

    def test_set_output_video_with_video_and_av_success(self):
        analyser = VideoAnalyser()
        analyser.set_output_video(output_video='output.mp4', save_with_av=True)

        assert analyser.stream
        assert analyser.container

    def test_is_ok_before_cap_open_return_false(self):
        with patch('cv2.VideoCapture') as mock_cap:
            mock_cap_instance = mock_cap.return_value
            mock_cap_instance.isOpened.return_value = False
            analyser = VideoAnalyser()

            assert not analyser.is_ok()

    def test_is_ok_after_cap_open_return_true(self):
        with patch('cv2.VideoCapture') as mock_cap:
            mock_cap_instance = mock_cap.return_value
            mock_cap_instance.isOpened.return_value = True
            analyser = VideoAnalyser()

            assert analyser.is_ok()

    def test_process_with_save_when_read_success_save_video(self):
        with patch('cv2.VideoCapture') as mock_cap:
            mock_cap_instance = mock_cap.return_value
            mock_cap_instance.read.return_value = (True, gen_fake_image())
            mock_save_video = MagicMock()

            analyser = VideoAnalyser()
            analyser.save_video = mock_save_video
            analyser.process(save=True)

            assert mock_save_video.called

    def test_process_with_save_when_read_failed_not_save_video(self):
        with patch('cv2.VideoCapture') as mock_cap:
            mock_cap_instance = mock_cap.return_value
            mock_cap_instance.read.return_value = (False, None)
            mock_save_video = MagicMock()

            analyser = VideoAnalyser()
            analyser.save_video = mock_save_video
            analyser.process(save=True)

            assert not mock_save_video.called

    def test_process_without_save_when_read_success_not_save_video(self):
        with patch('cv2.VideoCapture') as mock_cap:
            mock_cap_instance = mock_cap.return_value
            mock_cap_instance.read.return_value = (False, None)
            mock_save_video = MagicMock()

            analyser = VideoAnalyser()
            analyser.save_video = mock_save_video
            analyser.process(save=False)

            assert not mock_save_video.called

    def test_save_video_with_av_av_function_called(self):
        mock_save_video_with_av = MagicMock()

        analyser = VideoAnalyser()
        analyser.save_video_with_av = mock_save_video_with_av
        analyser.save_with_av = True
        analyser.save_video(gen_fake_image(), time.time())

        assert mock_save_video_with_av.called

    def test_save_video_without_av_opencv_function_called(self):
        mock_save_video_with_opencv = MagicMock()

        analyser = VideoAnalyser()
        analyser.save_video_with_opencv = mock_save_video_with_opencv
        analyser.save_with_av = False
        analyser.save_video(gen_fake_image(), None)

        assert mock_save_video_with_opencv.called

    def test_save_video_with_opencv_before_set_output_video_pass(self):
        analyser = VideoAnalyser()
        analyser.save_video_with_opencv(gen_fake_image())

    def test_save_video_with_opencv_with_out_stream_log_error(self):
        mock_out_stream = MagicMock()
        mock_out_stream.isOpened.return_value = False
        analyser = VideoAnalyser()
        analyser.out_stream = mock_out_stream

        mock_logging_error = MagicMock()
        with patch('core.utils.logger.error', mock_logging_error):
            analyser.save_video_with_opencv(gen_fake_image())
            assert mock_logging_error.called

    def test_save_video_with_av_before_set_output_video_pass(self):
        analyser = VideoAnalyser()
        analyser.save_video_with_av(gen_fake_image(), time.time())

    def test_save_video_with_av_with_antecedent_frame_skipped(self):
        analyser = VideoAnalyser()
        analyser.container = MagicMock()
        analyser.stream = MagicMock()
        mock_encode = MagicMock()
        analyser.stream.encode = mock_encode

        t_start = time.time()
        analyser.t_start_save_video = t_start + 12
        analyser.save_video_with_av(gen_fake_image(), t_start)

        assert not mock_encode.called

    def test_save_video_with_av_with_valid_frame_success(self):
        analyser = VideoAnalyser()
        # analyser = VideoAnalyser(input_video=INPUT_VIDEO_PATH)
        # analyser.set_output_video(output_video='output.mp4', save_with_av=True)
        analyser.container = MagicMock()
        analyser.container.mux = MagicMock()
        analyser.stream = MagicMock()
        mock_encode = MagicMock()
        analyser.stream.encode = mock_encode

        t_start = time.time()
        analyser.t_start_save_video = t_start - 1
        analyser.save_video_with_av(gen_fake_image(), t_start)

        assert mock_encode.called

    def test_release_container_without_save_not_finish_with_a_blank_frame(self):
        mock_av_finish_with_a_blank_frame = MagicMock()
        analyser = VideoAnalyser()
        analyser.av_finish_with_a_blank_frame = \
            mock_av_finish_with_a_blank_frame

        analyser.set_output_video(output_video='output.mp4', save_with_av=True)
        analyser.release_container()

        assert not mock_av_finish_with_a_blank_frame.called

    def test_release_container_reset_time_start_save_video(self):
        mock_av_finish_with_a_blank_frame = MagicMock()
        analyser = VideoAnalyser()
        analyser.av_finish_with_a_blank_frame = \
            mock_av_finish_with_a_blank_frame
        analyser.t_start_save_video = time.time()

        analyser.release_container()

        assert not analyser.t_start_save_video

    def test_release_container_reset_previous_pts(self):
        mock_av_finish_with_a_blank_frame = MagicMock()
        analyser = VideoAnalyser()
        analyser.av_finish_with_a_blank_frame = \
            mock_av_finish_with_a_blank_frame
        analyser.previous_pts = 134

        analyser.release_container()

        assert 0 == analyser.previous_pts


def test_main():
    analyser = VideoAnalyser()
    # analyser.set_output_video(output_video=OUTPUT_VIDEO_PATH, save_with_av=True)
    analyser.set_output_video(output_video=OUTPUT_VIDEO_PATH)
    count = 0
    while analyser.is_ok():
        count += 1
        if count == 196:
            break

        _, image = analyser.process()
        cv2.imshow('base', image)
        if cv2.waitKey(1) & 0xFF == ord('q'): #press q to quit
            break

    cv2.destroyAllWindows()