from unittest.mock import patch

from django.contrib.auth.models import User
from django.test import TestCase

from . import piper_engine


class TtsSynthesizeTests(TestCase):
    def setUp(self):
        self.user = User.objects.create_user(username='alice', password='pw12345678')

    def test_requires_auth(self):
        resp = self.client.post('/tts/synthesize/', {'text': 'Hallo'}, content_type='application/json')
        self.assertEqual(resp.status_code, 401)

    def test_rejects_empty_text(self):
        self.client.force_login(self.user)
        resp = self.client.post('/tts/synthesize/', {'text': '  '}, content_type='application/json')
        self.assertEqual(resp.status_code, 400)

    def test_rejects_text_over_limit(self):
        self.client.force_login(self.user)
        resp = self.client.post(
            '/tts/synthesize/', {'text': 'a' * 501}, content_type='application/json')
        self.assertEqual(resp.status_code, 400)

    def test_rejects_invalid_json(self):
        self.client.force_login(self.user)
        resp = self.client.post('/tts/synthesize/', 'not json', content_type='application/json')
        self.assertEqual(resp.status_code, 400)

    @patch.object(piper_engine, 'synthesize_wav', return_value=b'RIFF....WAVEfmt fake')
    def test_synthesizes_audio(self, mock_synth):
        self.client.force_login(self.user)
        resp = self.client.post(
            '/tts/synthesize/', {'text': 'Hallo Welt.'}, content_type='application/json')
        self.assertEqual(resp.status_code, 200)
        self.assertEqual(resp['Content-Type'], 'audio/wav')
        self.assertEqual(b''.join(resp.streaming_content), b'RIFF....WAVEfmt fake')
        mock_synth.assert_called_once_with('Hallo Welt.')