from fastapi import APIRouter, Depends, HTTPException, Request, status
from fastapi.responses import JSONResponse

from openhands.core.logger import openhands_logger as logger
from openhands.events.event_filter import EventFilter
from openhands.events.serialization.event import event_to_dict
from openhands.runtime.base import Runtime
from openhands.server.dependencies import get_dependencies
from openhands.server.session.conversation import ServerConversation
from openhands.server.shared import conversation_manager
from openhands.server.utils import get_conversation

app = APIRouter(prefix='/api/conversations/{conversation_id}', dependencies=get_dependencies())


@app.get('/config')
async def get_remote_runtime_config(conversation: ServerConversation = Depends(get_conversation)) -> JSONResponse:
    """Retrieve the runtime configuration.

    Currently, this is the session ID and runtime ID (if available).
    """
    runtime = conversation.runtime
    runtime_id = runtime.runtime_id if hasattr(runtime, 'runtime_id') else None
    session_id = runtime.sid if hasattr(runtime, 'sid') else None
    return JSONResponse(
        content={
            'runtime_id': runtime_id,
            'session_id': session_id,
        }
    )


@app.get('/vscode-url')
async def get_vscode_url(conversation: ServerConversation = Depends(get_conversation)) -> JSONResponse:
    """Get the VSCode URL.

    This endpoint allows getting the VSCode URL.

    Args:
        request (Request): The incoming FastAPI request object.

    Returns:
        JSONResponse: A JSON response indicating the success of the operation.
    """
    try:
        runtime: Runtime = conversation.runtime
        logger.debug(f'Runtime type: {type(runtime)}')
        logger.debug(f'Runtime VSCode URL: {runtime.vscode_url}')
        return JSONResponse(
            status_code=status.HTTP_200_OK, content={'vscode_url': runtime.vscode_url}
        )
    except Exception as e:
        logger.error(f'Error getting VSCode URL: {e}')
        return JSONResponse(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            content={
                'vscode_url': None,
                'error': f'Error getting VSCode URL: {e}',
            },
        )


@app.get('/web-hosts')
async def get_hosts(conversation: ServerConversation = Depends(get_conversation)) -> JSONResponse:
    """Get the hosts used by the runtime.

    This endpoint allows getting the hosts used by the runtime.

    Args:
        request (Request): The incoming FastAPI request object.

    Returns:
        JSONResponse: A JSON response indicating the success of the operation.
    """
    try:
        runtime: Runtime = conversation.runtime
        logger.debug(f'Runtime type: {type(runtime)}')
        logger.debug(f'Runtime hosts: {runtime.web_hosts}')
        return JSONResponse(status_code=200, content={'hosts': runtime.web_hosts})
    except Exception as e:
        logger.error(f'Error getting runtime hosts: {e}')
        return JSONResponse(
            status_code=500,
            content={
                'hosts': None,
                'error': f'Error getting runtime hosts: {e}',
            },
        )


@app.get('/events')
async def search_events(
    start_id: int = 0,
    end_id: int | None = None,
    reverse: bool = False,
    filter: EventFilter | None = None,
    limit: int = 20,
    conversation: ServerConversation = Depends(get_conversation),
):
    """Search through the event stream with filtering and pagination.
    Args:
        request: The incoming request object
        start_id: Starting ID in the event stream. Defaults to 0
        end_id: Ending ID in the event stream
        reverse: Whether to retrieve events in reverse order. Defaults to False.
        filter: Filter for events
        limit: Maximum number of events to return. Must be between 1 and 100. Defaults to 20
    Returns:
        dict: Dictionary containing:
            - events: List of matching events
            - has_more: Whether there are more matching events after this batch
    Raises:
        HTTPException: If conversation is not found
        ValueError: If limit is less than 1 or greater than 100
    """
    if limit < 0 or limit > 100:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST, detail='Invalid limit'
        )

    # Get matching events from the stream
    event_stream = conversation.event_stream
    events = list(
        event_stream.search_events(
            start_id=start_id,
            end_id=end_id,
            reverse=reverse,
            filter=filter,
            limit=limit + 1,
        )
    )

    # Check if there are more events
    has_more = len(events) > limit
    if has_more:
        events = events[:limit]  # Remove the extra event

    events_json = [event_to_dict(event) for event in events]
    return {
        'events': events_json,
        'has_more': has_more,
    }


@app.post('/events')
async def add_event(request: Request, conversation: ServerConversation = Depends(get_conversation)):
    data = request.json()
    await conversation_manager.send_to_event_stream(conversation.sid, data)
    return JSONResponse({'success': True})