from __future__ import division

import math

from .common import *

from av.video.stream import VideoStream



WIDTH = 320
HEIGHT = 240
DURATION = 48

def write_rgb_rotate(output):

    if not Image:
        raise SkipTest()

    output.metadata['title'] = 'container'
    output.metadata['key'] = 'value'

    stream = output.add_stream("mpeg4", 24)
    stream.width = WIDTH
    stream.height = HEIGHT
    stream.pix_fmt = "yuv420p"

    for frame_i in range(DURATION):

        frame = VideoFrame(WIDTH, HEIGHT, 'rgb24')
        image = Image.new('RGB', (WIDTH, HEIGHT), (
            int(255 * (0.5 + 0.5 * math.sin(frame_i / DURATION * 2 * math.pi))),
            int(255 * (0.5 + 0.5 * math.sin(frame_i / DURATION * 2 * math.pi + 2 / 3 * math.pi))),
            int(255 * (0.5 + 0.5 * math.sin(frame_i / DURATION * 2 * math.pi + 4 / 3 * math.pi))),
        ))
        frame.planes[0].update_from_string(image.tobytes())

        packet = stream.encode(frame)
        if packet:
            output.mux(packet)

    while True:
        packet = stream.encode()
        if packet:
            output.mux(packet)
        else:
            break

    # Done!
    output.close()


def assert_rgb_rotate(self, input_):


    # Now inspect it a little.
    self.assertEqual(len(input_.streams), 1)
    self.assertEqual(input_.metadata.get('title'), 'container', input_.metadata)
    self.assertEqual(input_.metadata.get('key'), None)
    stream = input_.streams[0]
    self.assertIsInstance(stream, VideoStream)
    self.assertEqual(stream.type, 'video')
    self.assertEqual(stream.name, 'mpeg4')
    self.assertEqual(stream.average_rate, 24) # Only because we constructed is precisely.
    self.assertEqual(stream.rate, Fraction(1, 24))
    self.assertEqual(stream.time_base * stream.duration, 2)
    self.assertEqual(stream.format.name, 'yuv420p')
    self.assertEqual(stream.format.width, WIDTH)
    self.assertEqual(stream.format.height, HEIGHT)


class TestBasicVideoEncoding(TestCase):

    def test_rgb_rotate(self):

        path = self.sandboxed('rgb_rotate.mov')
        output = av.open(path, 'w')

        write_rgb_rotate(output)
        assert_rgb_rotate(self, av.open(path))