"""委派工具：分别暴露 subagent 与 agent team 两种调用接口。"""

from typing import TYPE_CHECKING, Any

from nanobot.agent.tools.base import Tool

if TYPE_CHECKING:
    from nanobot.agent.delegation import DelegationManager


class DelegationTool(Tool):
    """委派类工具的公共上下文注入逻辑。"""

    def __init__(self, manager: "DelegationManager"):
        self._manager = manager
        self._origin_channel = "cli"
        self._origin_chat_id = "direct"
        self._announce_via_bus = True

    def set_context(self, channel: str, chat_id: str, announce_via_bus: bool = True) -> None:
        """设置后台委派结果回传的目标会话。"""
        self._origin_channel = channel
        self._origin_chat_id = chat_id
        self._announce_via_bus = announce_via_bus


class SpawnSubagentTool(DelegationTool):
    """把任务委派给单个 subagent。"""

    @property
    def name(self) -> str:
        return "spawn_subagent"

    @property
    def description(self) -> str:
        return (
            "Delegate a focused task to one background subagent. "
            "Use this for complex or time-consuming work that can run independently. "
            "You only provide the task and optional required skills; downstream routing decides the concrete agent. "
            "The subagent will report back when done."
        )

    @property
    def parameters(self) -> dict[str, Any]:
        return {
            "type": "object",
            "properties": {
                "task": {
                    "type": "string",
                    "description": "The task for the delegated subagent to complete",
                },
                "label": {
                    "type": "string",
                    "description": "Optional short label for the task (for display)",
                },
                "skills": {
                    "type": "array",
                    "items": {"type": "string"},
                    "description": "Optional list of skill names the delegated worker must follow",
                },
            },
            "required": ["task"],
        }

    async def execute(
        self,
        task: str,
        label: str | None = None,
        skills: list[str] | None = None,
        **kwargs: Any,
    ) -> str:
        """创建并启动一个 subagent 后台任务。"""
        return await self._manager.dispatch_subagent(
            task=task,
            label=label,
            skills=skills,
            origin_channel=self._origin_channel,
            origin_chat_id=self._origin_chat_id,
            announce_via_bus=self._announce_via_bus,
        )


class SpawnAgentTeamTool(DelegationTool):
    """启动一个 agent team 任务。"""

    @property
    def name(self) -> str:
        return "spawn_agent_team"

    @property
    def description(self) -> str:
        return (
            "Start an agent team for parallel exploration. "
            "Use this when multiple agents should investigate the task in parallel and return a combined result. "
            "You only provide the task and optional required skills; downstream routing selects the concrete members."
        )

    @property
    def parameters(self) -> dict[str, Any]:
        return {
            "type": "object",
            "properties": {
                "task": {
                    "type": "string",
                    "description": "The shared task for the agent team",
                },
                "label": {
                    "type": "string",
                    "description": "Optional short label for the team task (for display)",
                },
                "skills": {
                    "type": "array",
                    "items": {"type": "string"},
                    "description": "Optional list of skill names the team must follow",
                },
            },
            "required": ["task"],
        }

    async def execute(
        self,
        task: str,
        label: str | None = None,
        skills: list[str] | None = None,
        **kwargs: Any,
    ) -> str:
        """创建并启动一个 agent team 后台任务。"""
        return await self._manager.dispatch_agent_team(
            task=task,
            label=label,
            skills=skills,
            origin_channel=self._origin_channel,
            origin_chat_id=self._origin_chat_id,
            announce_via_bus=self._announce_via_bus,
        )


class NestedDelegateTool(Tool):
    """供 delegated worker 使用的受控下游委派工具。"""

    def __init__(self, manager: "DelegationManager", default_skills: list[str] | None = None):
        self._manager = manager
        self._default_skills = [str(item).strip() for item in (default_skills or []) if str(item).strip()]

    @property
    def name(self) -> str:
        return "delegate_task"

    @property
    def description(self) -> str:
        return (
            "Synchronously delegate a downstream task from a delegated worker. "
            "Use this only when specialized help is needed. "
            "It can route to an A2A agent or an ephemeral local subagent, but never creates a persistent subagent."
        )

    @property
    def parameters(self) -> dict[str, Any]:
        return {
            "type": "object",
            "properties": {
                "task": {
                    "type": "string",
                    "description": "The downstream task to delegate",
                },
                "label": {
                    "type": "string",
                    "description": "Optional short label for the downstream task",
                },
                "target": {
                    "type": "string",
                    "description": "Optional agent ID or name for the downstream worker",
                },
                "strategy": {
                    "type": "string",
                    "enum": ["auto", "a2a", "ephemeral_subagent"],
                    "description": "Routing strategy for downstream delegation. Default is auto.",
                },
                "skills": {
                    "type": "array",
                    "items": {"type": "string"},
                    "description": "Optional required skills for the downstream delegate. Defaults to the current worker's required skills.",
                },
            },
            "required": ["task"],
        }

    async def execute(
        self,
        task: str,
        label: str | None = None,
        target: str | None = None,
        strategy: str = "auto",
        skills: list[str] | None = None,
        **kwargs: Any,
    ) -> str:
        """同步执行一次受控下游委派，并把结果返回给当前 worker。"""
        return await self._manager.delegate_for_subagent(
            task=task,
            label=label,
            target=target,
            strategy=strategy,
            skills=skills if skills is not None else list(self._default_skills),
        )