import json

import pytest

from voice_assistant.agent.oci import extract_text_delta


def test_extract_text_delta():
    payload = {
        "index": 0,
        "message": {
            "role": "ASSISTANT",
            "content": [
                {
                    "type": "TEXT",
                    "text": "Olá",
                }
            ],
        },
    }

    result = extract_text_delta(json.dumps(payload))

    assert result == "Olá"


def test_extract_text_delta_preserves_spaces():
    payload = {
        "message": {
            "content": [
                {
                    "type": "TEXT",
                    "text": " mundo",
                }
            ],
        },
    }

    assert extract_text_delta(json.dumps(payload)) == " mundo"


def test_extract_text_delta_ignores_empty_text():
    payload = {
        "message": {
            "content": [
                {
                    "type": "TEXT",
                    "text": "",
                }
            ],
        },
    }

    assert extract_text_delta(json.dumps(payload)) is None


def test_extract_text_delta_done():
    assert extract_text_delta("[DONE]") is None


def test_extract_text_delta_rejects_invalid_json():
    with pytest.raises(ValueError, match="Invalid JSON"):
        extract_text_delta("{invalid")


def test_extract_text_delta_ignores_non_text_events():
    payload = {
        "message": {
            "content": [
                {
                    "type": "OTHER",
                    "text": "ignored",
                }
            ],
        },
    }

    assert extract_text_delta(json.dumps(payload)) is None