from __future__ import unicode_literals  # So that we can format strings with Unicode characters
import random
import sys
from StringIO import StringIO

from robot_interface.utils.microphone import (
    choose_mic_default,
    choose_mic_interactive,
    choose_mic_arguments,
    choose_mic,
    get_microphones,
)


class MicrophoneUtils(object):
    """Shared tests for any PyAudio-like implementation, e.g. mock and real."""

    def test_choose_mic_default(self, pyaudio_instance):
        """
        The result must contain at least "index", as this is used to identify the microphone.
        The "name" is used for logging, so it should also exist.
        It must have one or more channels.
        Lastly it must be capable of sending at least 16000 samples per second.
        """
        result = choose_mic_default(pyaudio_instance)
        assert "index" in result
        assert isinstance(result["index"], (int, long))

        assert "name" in result
        assert isinstance(result["name"], (str, unicode))

        assert "maxInputChannels" in result
        assert isinstance(result["maxInputChannels"], (int, long))
        assert result["maxInputChannels"] > 0

        assert "defaultSampleRate" in result
        assert isinstance(result["defaultSampleRate"], float)
        assert result["defaultSampleRate"] >= 16000

    def test_choose_mic_interactive_input_not_int(self, pyaudio_instance, mocker):
        """
        First mock an input that's not an integer, then a valid integer. There should be no errors.
        """
        microphones = get_microphones(pyaudio_instance)
        target_microphone = next(microphones)

        mock_input = mocker.patch("__builtin__.raw_input", side_effect=["not an integer", "0"])
        fake_out = StringIO()
        mocker.patch.object(sys, "stdout", fake_out)

        result = choose_mic_interactive(pyaudio_instance)
        assert "index" in result
        assert isinstance(result["index"], (int, long))
        assert result["index"] == target_microphone["index"]

        assert mock_input.called

        assert any(p.startswith("Please enter a number") for p in fake_out.getvalue().splitlines())

    def test_choose_mic_interactive_negative_index(self, pyaudio_instance, mocker):
        """
        Make sure that the interactive method does not allow negative integers as input.
        """
        microphones = get_microphones(pyaudio_instance)
        target_microphone = next(microphones)

        mock_input = mocker.patch("__builtin__.raw_input", side_effect=["-1", "0"])
        fake_out = StringIO()
        mocker.patch.object(sys, "stdout", fake_out)

        result = choose_mic_interactive(pyaudio_instance)
        assert "index" in result
        assert isinstance(result["index"], (int, long))
        assert result["index"] == target_microphone["index"]

        assert mock_input.called

        assert any(p.startswith("Please enter a number") for p in fake_out.getvalue().splitlines())

    def test_choose_mic_interactive_index_too_high(self, pyaudio_instance, mocker):
        """
        Make sure that the interactive method does not allow indices higher than the highest mic index.
        """
        real_count = len(list(get_microphones(pyaudio_instance)))
        mock_input = mocker.patch("__builtin__.raw_input", side_effect=[str(real_count), "0"])
        fake_out = StringIO()
        mocker.patch.object(sys, "stdout", fake_out)

        result = choose_mic_interactive(pyaudio_instance)
        assert "index" in result
        assert isinstance(result["index"], (int, long))

        assert mock_input.called

        assert any(p.startswith("Please enter a number") for p in fake_out.getvalue().splitlines())

    def test_choose_mic_interactive_random_index(self, pyaudio_instance, mocker):
        """
        Get a random index from the list of available mics, make sure it's correct.
        """
        microphones = list(get_microphones(pyaudio_instance))
        random_index = random.randrange(len(microphones))
        mocker.patch("__builtin__.raw_input", side_effect=[str(random_index)])

        result = choose_mic_interactive(pyaudio_instance)
        assert "index" in result
        assert isinstance(result["index"], (int, long))
        assert result["index"] == microphones[random_index]["index"]

    def test_choose_mic_no_arguments(self, pyaudio_instance, mocker):
        mocker.patch.object(sys, "argv", [])

        result = choose_mic_arguments(pyaudio_instance)

        assert result is None

    def test_choose_mic_arguments(self, pyaudio_instance, mocker):
        for mic in get_microphones(pyaudio_instance):
            mocker.patch.object(sys, "argv", ["--microphone", mic["name"]])

            result = choose_mic_arguments(pyaudio_instance)

            assert result is not None
            assert result == mic

    def test_choose_mic_arguments_eq(self, pyaudio_instance, mocker):
        for mic in get_microphones(pyaudio_instance):
            mocker.patch.object(sys, "argv", ["--microphone={}".format(mic["name"])])

            result = choose_mic_arguments(pyaudio_instance)

            assert result is not None
            assert result == mic

    def test_choose_mic_arguments_not_exits(self, pyaudio_instance, mocker):
        mocker.patch.object(sys, "argv", ["--microphone", "Surely this microphone doesn't exist"])

        result = choose_mic_arguments(pyaudio_instance)

        assert result is None

    def test_choose_mic_with_argument(self, pyaudio_instance, mocker):
        mic = next(get_microphones(pyaudio_instance))
        mocker.patch.object(sys, "argv", ["--microphone", mic["name"]])

        result = choose_mic(pyaudio_instance)

        assert result is not None
        assert result == mic

    def test_choose_mic_no_argument(self, pyaudio_instance, mocker):
        default_mic = choose_mic_default(pyaudio_instance)
        mocker.patch.object(sys, "argv", [])

        result = choose_mic(pyaudio_instance)

        assert result is not None
        assert result == default_mic