"""Unit tests for WebSocketAdapter._process_image_components.

The web debug client uploads Image / Voice / File components carrying a storage
key in ``path``. This helper resolves each to a base64 data URI (so multimodal
LLM input and the Box sandbox inbox have usable bytes). Image uploads remain as
authenticated history references until storage retention cleanup, while other
consumed uploads are deleted. Covers mimetype selection per type and
fail-closed error handling.
"""

from __future__ import annotations

import base64
from types import SimpleNamespace
from unittest.mock import AsyncMock, Mock

import pytest

from langbot.pkg.api.http.context import ExecutionContext
from langbot.pkg.platform.sources.websocket_adapter import WebSocketAdapter


_CONTEXT = ExecutionContext(
    instance_uuid='instance-a',
    workspace_uuid='workspace-a',
    placement_generation=1,
    pipeline_uuid='pipeline-a',
)
_UPLOAD_PREFIX = 'v1/instance-a/workspace-a/1/upload_image/'


def _make_connection():
    return SimpleNamespace(execution_context=_CONTEXT)


def _make_adapter(load_return=b'hello', load_side_effect=None):
    provider = Mock()
    provider.load = AsyncMock(return_value=load_return, side_effect=load_side_effect)
    storage_mgr = Mock()
    storage_mgr.storage_provider = provider
    storage_mgr.load_scoped_object_key = AsyncMock(return_value=load_return, side_effect=load_side_effect)
    storage_mgr.scoped_prefix.return_value = _UPLOAD_PREFIX
    storage_mgr.is_scoped_object_key.return_value = True
    storage_mgr.delete_scoped_object_key = AsyncMock()
    ap = Mock()
    ap.storage_mgr = storage_mgr
    logger = Mock()
    logger.error = AsyncMock()
    logger.warning = AsyncMock()
    # WebSocketAdapter is a pydantic model; bypass full __init__/validation.
    adapter = WebSocketAdapter.model_construct(ap=ap, logger=logger)
    return adapter, storage_mgr, provider


@pytest.mark.asyncio
async def test_image_jpeg_mimetype_and_retained_history_key():
    adapter, storage_mgr, _ = _make_adapter(load_return=b'\xff\xd8\xff')
    path = f'{_UPLOAD_PREFIX}photo.jpg'
    chain = [{'type': 'Image', 'path': path}]

    await adapter._process_image_components(_make_connection(), chain)

    expected_b64 = base64.b64encode(b'\xff\xd8\xff').decode('utf-8')
    assert chain[0]['base64'] == f'data:image/jpeg;base64,{expected_b64}'
    assert chain[0]['path'] == path
    storage_mgr.delete_scoped_object_key.assert_not_awaited()

    history = adapter._history_message_chain(chain)
    assert history == [{'type': 'Image', 'path': path, 'base64': ''}]


def test_history_retains_storage_key_without_large_base64_payload():
    path = f'{_UPLOAD_PREFIX}photo.jpg'
    chain = [
        {
            'type': 'Image',
            'path': path,
            'base64': 'data:image/jpeg;base64,large-payload',
        }
    ]

    history = WebSocketAdapter._history_message_chain(chain)

    assert history == [{'type': 'Image', 'path': path, 'base64': ''}]
    assert chain[0]['base64'] == 'data:image/jpeg;base64,large-payload'


@pytest.mark.asyncio
async def test_image_defaults_to_png():
    adapter, _, _ = _make_adapter()
    chain = [{'type': 'Image', 'path': f'{_UPLOAD_PREFIX}blob'}]
    await adapter._process_image_components(_make_connection(), chain)
    assert chain[0]['base64'].startswith('data:image/png;base64,')


@pytest.mark.asyncio
async def test_voice_uses_guessed_or_wav_mimetype():
    adapter, storage_mgr, _ = _make_adapter()
    chain = [{'type': 'Voice', 'path': f'{_UPLOAD_PREFIX}clip.wav'}]
    await adapter._process_image_components(_make_connection(), chain)
    assert chain[0]['base64'].startswith('data:audio/')
    assert chain[0]['path'] == ''
    storage_mgr.delete_scoped_object_key.assert_awaited_once()


@pytest.mark.asyncio
async def test_file_uses_octet_stream_fallback():
    adapter, storage_mgr, _ = _make_adapter()
    chain = [{'type': 'File', 'path': f'{_UPLOAD_PREFIX}unknownblob'}]
    await adapter._process_image_components(_make_connection(), chain)
    assert chain[0]['base64'].startswith('data:application/octet-stream;base64,')
    assert chain[0]['path'] == ''
    storage_mgr.delete_scoped_object_key.assert_awaited_once()


@pytest.mark.asyncio
async def test_skips_components_without_path_or_unknown_type():
    adapter, storage_mgr, provider = _make_adapter()
    chain = [
        {'type': 'Image', 'path': ''},  # no path
        {'type': 'Plain', 'path': 'storage://abc/x'},  # not a file component
        {'type': 'At', 'target': '123'},  # no path key at all
    ]
    await adapter._process_image_components(_make_connection(), chain)
    provider.load.assert_not_awaited()
    storage_mgr.load_scoped_object_key.assert_not_awaited()
    assert 'base64' not in chain[0]
    assert 'base64' not in chain[1]


@pytest.mark.asyncio
async def test_load_failure_is_logged_and_aborts_processing():
    adapter, _, _ = _make_adapter(load_side_effect=RuntimeError('storage down'))
    chain = [{'type': 'File', 'path': f'{_UPLOAD_PREFIX}doc.pdf'}]

    with pytest.raises(RuntimeError, match='storage down'):
        await adapter._process_image_components(_make_connection(), chain)
    assert 'base64' not in chain[0]
    adapter.logger.error.assert_awaited_once()