import asyncio
import logging
import sys
from uuid import uuid4

from termcolor import colored

import openhands.agenthub  # noqa F401 (we import this to get the agents registered)
from openhands.core.config import (
    AppConfig,
    parse_arguments,
    setup_config_from_args,
)
from openhands.core.logger import openhands_logger as logger
from openhands.core.loop import run_agent_until_done
from openhands.core.schema import AgentState
from openhands.core.setup import create_agent, create_controller, create_runtime
from openhands.events import EventSource, EventStreamSubscriber
from openhands.events.action import (
    Action,
    ActionConfirmationStatus,
    ChangeAgentStateAction,
    CmdRunAction,
    FileEditAction,
    MessageAction,
)
from openhands.events.event import Event
from openhands.events.observation import (
    AgentStateChangedObservation,
    CmdOutputObservation,
    FileEditObservation,
)
from openhands.io import read_input, read_task


def display_message(message: str):
    print(colored('🤖 ' + message + '\n', 'yellow'))


def display_command(command: str):
    print('❯ ' + colored(command + '\n', 'green'))


def display_confirmation(confirmation_state: ActionConfirmationStatus):
    if confirmation_state == ActionConfirmationStatus.CONFIRMED:
        print(colored('✅ ' + confirmation_state + '\n', 'green'))
    elif confirmation_state == ActionConfirmationStatus.REJECTED:
        print(colored('❌ ' + confirmation_state + '\n', 'red'))
    else:
        print(colored('⏳ ' + confirmation_state + '\n', 'yellow'))


def display_command_output(output: str):
    lines = output.split('\n')
    for line in lines:
        if line.startswith('[Python Interpreter') or line.startswith('openhands@'):
            # TODO: clean this up once we clean up terminal output
            continue
        print(colored(line, 'blue'))
    print('\n')


def display_file_edit(event: FileEditAction | FileEditObservation):
    print(colored(str(event), 'green'))


def display_event(event: Event, config: AppConfig):
    if isinstance(event, Action):
        if hasattr(event, 'thought'):
            display_message(event.thought)
    if isinstance(event, MessageAction):
        if event.source == EventSource.AGENT:
            display_message(event.content)
    if isinstance(event, CmdRunAction):
        display_command(event.command)
    if isinstance(event, CmdOutputObservation):
        display_command_output(event.content)
    if isinstance(event, FileEditAction):
        display_file_edit(event)
    if isinstance(event, FileEditObservation):
        display_file_edit(event)
    if hasattr(event, 'confirmation_state') and config.security.confirmation_mode:
        display_confirmation(event.confirmation_state)


async def main(loop: asyncio.AbstractEventLoop):
    """Runs the agent in CLI mode."""

    args = parse_arguments()

    logger.setLevel(logging.WARNING)

    # Load config from toml and override with command line arguments
    config: AppConfig = setup_config_from_args(args)

    # Read task from file, CLI args, or stdin
    task_str = read_task(args, config.cli_multiline_input)

    # If we have a task, create initial user action
    initial_user_action = MessageAction(content=task_str) if task_str else None

    sid = str(uuid4())
    display_message(f'Session ID: {sid}')

    agent = create_agent(config)

    runtime = create_runtime(
        config,
        sid=sid,
        headless_mode=True,
        agent=agent,
        selected_repository=config.sandbox.selected_repo,
    )

    controller, _ = create_controller(agent, runtime, config)

    event_stream = runtime.event_stream

    async def prompt_for_next_task():
        # Run input() in a thread pool to avoid blocking the event loop
        next_message = await loop.run_in_executor(
            None, read_input, config.cli_multiline_input
        )
        if not next_message.strip():
            await prompt_for_next_task()
        if next_message == 'exit':
            event_stream.add_event(
                ChangeAgentStateAction(AgentState.STOPPED), EventSource.ENVIRONMENT
            )
            return
        action = MessageAction(content=next_message)
        event_stream.add_event(action, EventSource.USER)

    async def prompt_for_user_confirmation():
        user_confirmation = await loop.run_in_executor(
            None, lambda: input('Confirm action (possible security risk)? (y/n) >> ')
        )
        return user_confirmation.lower() == 'y'

    async def on_event_async(event: Event):
        display_event(event, config)
        if isinstance(event, AgentStateChangedObservation):
            if event.agent_state in [
                AgentState.AWAITING_USER_INPUT,
                AgentState.FINISHED,
            ]:
                await prompt_for_next_task()
            if event.agent_state == AgentState.AWAITING_USER_CONFIRMATION:
                user_confirmed = await prompt_for_user_confirmation()
                if user_confirmed:
                    event_stream.add_event(
                        ChangeAgentStateAction(AgentState.USER_CONFIRMED),
                        EventSource.USER,
                    )
                else:
                    event_stream.add_event(
                        ChangeAgentStateAction(AgentState.USER_REJECTED),
                        EventSource.USER,
                    )

    def on_event(event: Event) -> None:
        loop.create_task(on_event_async(event))

    event_stream.subscribe(EventStreamSubscriber.MAIN, on_event, str(uuid4()))

    await runtime.connect()

    if initial_user_action:
        # If there's an initial user action, enqueue it and do not prompt again
        event_stream.add_event(initial_user_action, EventSource.USER)
    else:
        # Otherwise prompt for the user's first message right away
        asyncio.create_task(prompt_for_next_task())

    await run_agent_until_done(
        controller, runtime, [AgentState.STOPPED, AgentState.ERROR]
    )


if __name__ == '__main__':
    loop = asyncio.new_event_loop()
    asyncio.set_event_loop(loop)
    try:
        loop.run_until_complete(main(loop))
    except KeyboardInterrupt:
        print('Received keyboard interrupt, shutting down...')
    except ConnectionRefusedError as e:
        print(f'Connection refused: {e}')
        sys.exit(1)
    except Exception as e:
        print(f'An error occurred: {e}')
        sys.exit(1)
    finally:
        try:
            # Cancel all running tasks
            pending = asyncio.all_tasks(loop)
            for task in pending:
                task.cancel()
            # Wait for all tasks to complete with a timeout
            loop.run_until_complete(asyncio.gather(*pending, return_exceptions=True))
            loop.close()
        except Exception as e:
            print(f'Error during cleanup: {e}')
            sys.exit(1)