import unittest

from parley.errors import TranscriptionError
from parley.transcription import parse_jsonl


class ParseJsonlTests(unittest.TestCase):
    def test_skips_header_and_malformed_lines(self) -> None:
        output = "\n".join(
            [
                "runtime diagnostic",
                '{"type":"batch_header","count":1}',
                '{"file":"recording.wav","text":"hello world"}',
            ]
        )
        self.assertEqual(parse_jsonl(output), "hello world")

    def test_reports_error_row(self) -> None:
        with self.assertRaisesRegex(TranscriptionError, "decoder failed"):
            parse_jsonl('{"file":"x.wav","error":"decoder failed","text":""}')

    def test_rejects_output_without_result(self) -> None:
        with self.assertRaisesRegex(TranscriptionError, "no transcript"):
            parse_jsonl('{"type":"batch_header"}\nnot json')

    def test_accepts_empty_transcript(self) -> None:
        self.assertEqual(parse_jsonl('{"text":""}'), "")


if __name__ == "__main__":
    unittest.main()