"""状态管理器"""

import logging
from typing import Optional
from dataclasses import dataclass, field

logger = logging.getLogger(__name__)


@dataclass
class BotState:
    """机器人状态"""

    # 当前对话 ID
    conversation_id: Optional[str] = None

    # 当前任务 ID
    task_id: Optional[str] = None

    # 任务状态：idle, running
    status: str = "idle"

    # 轮询偏移量
    last_offset: int = 0

    def is_idle(self) -> bool:
        """是否空闲"""
        return self.status == "idle"

    def is_running(self) -> bool:
        """是否运行中"""
        return self.status == "running"

    def start_task(self, task_id: str):
        """开始任务"""
        self.task_id = task_id
        self.status = "running"
        self.last_offset = 0
        logger.info(f"任务开始: {task_id}")

    def finish_task(self):
        """完成任务"""
        logger.info(f"任务完成: {self.task_id}")
        self.task_id = None
        self.status = "idle"
        self.last_offset = 0

    def set_conversation(self, conversation_id: str):
        """设置当前对话"""
        self.conversation_id = conversation_id
        logger.info(f"切换到对话: {conversation_id}")


class StateManager:
    """状态管理器（单群模式）"""

    def __init__(self):
        self.state = BotState()

    def get_state(self) -> BotState:
        """获取当前状态"""
        return self.state

    def reset(self):
        """重置状态"""
        self.state = BotState()
        logger.info("状态已重置")