"""Tests for FastGPT SSE stream parsing helpers."""

import pytest

from fastgpt_client.exceptions import StreamParseError
from fastgpt_client.streaming import aiter_stream_events, iter_stream_events
from fastgpt_client.stream_types import FastGPTInteractiveEvent


class _AsyncResponse:
    def __init__(self, lines):
        self._lines = lines

    async def aiter_lines(self):
        for line in self._lines:
            yield line


class _SyncResponse:
    def __init__(self, lines):
        self._lines = lines

    def iter_lines(self):
        return iter(self._lines)


def test_iter_stream_events_parses_mixed_stream():
    response = _SyncResponse([
        'data: {"choices":[{"delta":{"content":"Hel"}}]}',
        '',
        'event:flowNodeStatus',
        'data: {"status":"running","nodeName":"Classifier"}',
        '',
        'event:flowResponses',
        'data: {"moduleName":"Classifier","tokens":4}',
        '',
        'event:interactive',
        'data: {"type":"userSelect","params":{"userSelectOptions":[{"value":"A"}]}}',
        '',
        'data: [DONE]',
        '',
    ])

    events = list(iter_stream_events(response))

    assert [event.kind for event in events] == [
        'data',
        'flowNodeStatus',
        'flowResponses',
        'interactive',
        'done',
    ]
    assert isinstance(events[3], FastGPTInteractiveEvent)
    assert events[3].interaction_type == 'userSelect'


def test_iter_stream_events_parses_user_input_interactive():
    response = _SyncResponse([
        'event:interactive',
        'data: {"type":"userInput","params":{"inputForm":[{"label":"Name"}]}}',
        '',
    ])

    events = list(iter_stream_events(response))

    assert len(events) == 1
    assert isinstance(events[0], FastGPTInteractiveEvent)
    assert events[0].interaction_type == 'userInput'


def test_iter_stream_events_unwraps_tool_children_interactive():
    response = _SyncResponse([
        'event:interactive',
        'data: {"interactive":{"type":"toolChildrenInteractive","params":{"childrenResponse":{"type":"userInput","params":{"description":"???????","inputForm":[{"label":"????"}]}}}}}',
        '',
    ])

    events = list(iter_stream_events(response))

    assert len(events) == 1
    assert isinstance(events[0], FastGPTInteractiveEvent)
    assert events[0].interaction_type == 'userInput'
    assert events[0].data['params']['description'] == '???????'
    assert isinstance(events[0].data['params']['inputForm'], list)
    assert events[0].data['params']['inputForm'][0]['label'] == '????'


@pytest.mark.asyncio
async def test_aiter_stream_events_parses_mixed_stream():
    response = _AsyncResponse([
        'data: {"choices":[{"delta":{"content":"Hi"}}]}',
        '',
        'event:interactive',
        'data: {"type":"userSelect","params":{"userSelectOptions":[{"value":"A"}]}}',
        '',
        'data: [DONE]',
        '',
    ])

    events = []
    async for event in aiter_stream_events(response):
        events.append(event)

    assert [event.kind for event in events] == ['data', 'interactive', 'done']
    assert isinstance(events[1], FastGPTInteractiveEvent)


def test_iter_stream_events_rejects_malformed_json():
    response = _SyncResponse([
        'event:interactive',
        'data: {invalid json}',
        '',
    ])

    with pytest.raises(StreamParseError):
        list(iter_stream_events(response))


def test_iter_stream_events_rejects_malformed_frame_boundary():
    response = _SyncResponse([
        'event:interactive',
        'event:error',
        'data: {"message":"bad"}',
        '',
    ])

    with pytest.raises(StreamParseError):
        list(iter_stream_events(response))


def test_iter_stream_events_treats_done_marker_under_answer_event_as_done():
    response = _SyncResponse([
        'event:answer',
        'data: [DONE]',
        '',
    ])

    events = list(iter_stream_events(response))

    assert [event.kind for event in events] == ['done']


def test_iter_stream_events_allows_array_payloads_for_non_interactive_events():
    response = _SyncResponse([
        'event:flowResponses',
        'data: [{"moduleName":"NodeA"},{"moduleName":"NodeB"}]',
        '',
    ])

    events = list(iter_stream_events(response))

    assert [event.kind for event in events] == ['flowResponses']
    assert isinstance(events[0].data, list)
    assert events[0].data[0]['moduleName'] == 'NodeA'