from __future__ import annotations

from .base import BaseSkill, SkillResult, WorkflowContext


class SkillRegistry:
    def __init__(self):
        self._skills: dict[str, BaseSkill] = {}

    def register(self, skill: BaseSkill) -> None:
        if not skill.name:
            raise ValueError("Skill 必须声明 name。")
        self._skills[skill.name] = skill

    def get(self, name: str) -> BaseSkill:
        try:
            return self._skills[name]
        except KeyError as exc:
            raise KeyError(f"Skill 未注册：{name}") from exc

    def execute(self, name: str, context: WorkflowContext) -> SkillResult:
        return self.get(name).run(context)