import asyncio
from typing import Generator, List
from camel.agents import ChatAgent
from camel.societies.workforce.workforce import (
    Workforce as BaseWorkforce,
    WorkforceState,
    DEFAULT_WORKER_POOL_SIZE,
)
from camel.societies.workforce.task_channel import TaskChannel
from camel.societies.workforce.base import BaseNode
from camel.societies.workforce.utils import TaskAssignResult
from loguru import logger
from camel.tasks.task import Task, TaskState, validate_task_content
from app.component import code
from app.exception.exception import UserException
from app.utils.agent import ListenChatAgent
from app.service.task import (
    Action,
    ActionAssignTaskData,
    ActionEndData,
    ActionTaskStateData,
    get_camel_task,
    get_task_lock,
)
from app.utils.single_agent_worker import SingleAgentWorker

# === Debug sink === Write detailed dependency debug logs to file (logs/workforce_debug.log)
# Create a new file every day, keep the logs for the last 7 days, and write asynchronously without blocking the main process
logger.add(
    "logs/workforce_debug_{time:YYYY-MM-DD}.log",
    rotation="00:00",
    retention="7 days",
    enqueue=True,
    level="DEBUG",
)
# Independent sink: only collect the "[WF]" debug lines we insert to quickly view the dependency chain
logger.add(
    "logs/wf_trace_{time:YYYY-MM-DD-HH}.log",
    rotation="00:00",
    retention="7 days",
    enqueue=True,
    level="DEBUG",
    filter=lambda record: record["message"].startswith("[WF]"),
)


class Workforce(BaseWorkforce):
    def __init__(
        self,
        api_task_id: str,
        description: str,
        children: List[BaseNode] | None = None,
        coordinator_agent: ChatAgent | None = None,
        task_agent: ChatAgent | None = None,
        new_worker_agent: ChatAgent | None = None,
        graceful_shutdown_timeout: float = 3,
        share_memory: bool = False,
        use_structured_output_handler: bool = True,
    ) -> None:
        self.api_task_id = api_task_id
        super().__init__(
            description=description,
            children=children,
            coordinator_agent=coordinator_agent,
            task_agent=task_agent,
            new_worker_agent=new_worker_agent,
            graceful_shutdown_timeout=graceful_shutdown_timeout,
            share_memory=share_memory,
            use_structured_output_handler=use_structured_output_handler,
        )

    def eigent_make_sub_tasks(self, task: Task):
        """split process_task method to eigent_make_sub_tasks and eigent_start method"""

        if not validate_task_content(task.content, task.id):
            task.state = TaskState.FAILED
            task.result = "Task failed: Invalid or empty content provided"
            logger.warning(
                f"Task {task.id} rejected: Invalid or empty content. Content preview: '{task.content[:50]}...'"
            )
            raise UserException(code.error, task.result)

        self.reset()
        self._task = task
        self._state = WorkforceState.RUNNING
        task.state = TaskState.OPEN
        self._pending_tasks.append(task)

        # Decompose the task into subtasks first
        subtasks_result = self._decompose_task(task)

        # Handle both streaming and non-streaming results
        if isinstance(subtasks_result, Generator):
            # This is a generator (streaming mode)
            subtasks = []
            for new_tasks in subtasks_result:
                subtasks.extend(new_tasks)
        else:
            # This is a regular list (non-streaming mode)
            subtasks = subtasks_result

        return subtasks

    async def eigent_start(self, subtasks: list[Task]):
        """start the workforce"""
        logger.debug(f"start the workforce {subtasks=}")
        self._pending_tasks.extendleft(reversed(subtasks))
        self.set_channel(TaskChannel())
        # Save initial snapshot
        self.save_snapshot("Initial task decomposition")

        try:
            await self.start()
        except Exception as e:
            logger.error(f"Error in workforce execution: {e}")
            self._state = WorkforceState.STOPPED
            raise
        finally:
            if self._state != WorkforceState.STOPPED:
                self._state = WorkforceState.IDLE

    async def _find_assignee(self, tasks: List[Task]) -> TaskAssignResult:
        # Task assignment phase: send "waiting for execution" notification to the frontend, and send "start execution" notification when the task actually begins execution
        assigned = await super()._find_assignee(tasks)

        task_lock = get_task_lock(self.api_task_id)
        for item in assigned.assignments:
            # DEBUG ▶ Task has been assigned to which worker and its dependencies
            logger.debug(f"[WF] ASSIGN {item.task_id} -> {item.assignee_id} deps={item.dependencies}")
            # The main task itself does not need notification
            if self._task and item.task_id == self._task.id:
                continue
            # Find task content
            task_obj = get_camel_task(item.task_id, tasks)
            content = task_obj.content if task_obj else ""
            # Asynchronously send waiting notification
            task = asyncio.create_task(
                task_lock.put_queue(
                    ActionAssignTaskData(
                        action=Action.assign_task,
                        data={
                            "assignee_id": item.assignee_id,
                            "task_id": item.task_id,
                            "content": content,
                            "state": "waiting",  # Mark as waiting state
                        },
                    )
                )
            )
            # Track the task for cleanup
            task_lock.add_background_task(task)
        return assigned

    async def _post_task(self, task: Task, assignee_id: str) -> None:
        # DEBUG ▶ Dependencies are met, the task really starts to execute
        logger.debug(f"[WF] POST  {task.id} -> {assignee_id}")
        """Override the _post_task method to notify the frontend when the task really starts to execute"""
        # When the dependency check is passed and the task is about to be published to the execution queue, send a notification to the frontend
        task_lock = get_task_lock(self.api_task_id)
        if self._task and task.id != self._task.id:  # Skip the main task itself
            await task_lock.put_queue(
                ActionAssignTaskData(
                    action=Action.assign_task,
                    data={
                        "assignee_id": assignee_id,
                        "task_id": task.id,
                        "content": task.content,
                        "state": "running",  # running state
                    },
                )
            )
        # Call the parent class method to continue the normal task publishing process
        await super()._post_task(task, assignee_id)

    def add_single_agent_worker(
        self, description: str, worker: ListenChatAgent, pool_max_size: int = DEFAULT_WORKER_POOL_SIZE
    ) -> BaseWorkforce:
        if self._state == WorkforceState.RUNNING:
            raise RuntimeError("Cannot add workers while workforce is running. Pause the workforce first.")

        # Validate worker agent compatibility
        self._validate_agent_compatibility(worker, "Worker agent")

        # Ensure the worker agent shares this workforce's pause control
        self._attach_pause_event_to_agent(worker)

        worker_node = SingleAgentWorker(
            description=description,
            worker=worker,
            pool_max_size=pool_max_size,
            use_structured_output_handler=self.use_structured_output_handler,
        )
        self._children.append(worker_node)

        # If we have a channel set up, set it for the new worker
        if hasattr(self, "_channel") and self._channel is not None:
            worker_node.set_channel(self._channel)

        # If workforce is paused, start the worker's listening task
        self._start_child_node_when_paused(worker_node.start())

        if self.metrics_logger:
            self.metrics_logger.log_worker_created(
                worker_id=worker_node.node_id,
                worker_type="SingleAgentWorker",
                role=worker_node.description,
            )
        return self

    async def _handle_completed_task(self, task: Task) -> None:
        # DEBUG ▶ Task completed
        logger.debug(f"[WF] DONE  {task.id}")
        task_lock = get_task_lock(self.api_task_id)

        await task_lock.put_queue(
            ActionTaskStateData(
                data={
                    "task_id": task.id,
                    "content": task.content,
                    "state": task.state,
                    "result": task.result or "",
                    "failure_count": task.failure_count,
                },
            )
        )

        return await super()._handle_completed_task(task)

    async def _handle_failed_task(self, task: Task) -> bool:
        # DEBUG ▶ Task failed
        logger.debug(f"[WF] FAIL  {task.id} retry={task.failure_count}")

        result = await super()._handle_failed_task(task)

        error_message = ""
        if self.metrics_logger and hasattr(self.metrics_logger, "log_entries"):
            for entry in reversed(self.metrics_logger.log_entries):
                if entry.get("event_type") == "task_failed" and entry.get("task_id") == task.id:
                    error_message = entry.get("error_message")
                    break

        task_lock = get_task_lock(self.api_task_id)
        await task_lock.put_queue(
            ActionTaskStateData(
                data={
                    "task_id": task.id,
                    "content": task.content,
                    "state": task.state,
                    "failure_count": task.failure_count,
                    "result": str(error_message),
                }
            )
        )

        return result

    def stop(self) -> None:
        super().stop()
        task_lock = get_task_lock(self.api_task_id)
        task = asyncio.create_task(task_lock.put_queue(ActionEndData()))
        task_lock.add_background_task(task)

    async def cleanup(self) -> None:
        r"""Clean up resources when workforce is done"""
        try:
            # Clean up the task lock
            from app.service.task import delete_task_lock

            await delete_task_lock(self.api_task_id)
        except Exception as e:
            logger.error(f"Error cleaning up workforce resources: {e}")