from ..models import Skill


class SkillService:
    @staticmethod
    def install_skill(skill_id):
        skill = Skill.query.get(skill_id)
        if not skill:
            raise ValueError("技能不存在")

        if skill.is_installed:
            raise ValueError("技能已安装")

        skill.is_installed = True
        skill.save()
        return skill

    @staticmethod
    def uninstall_skill(skill_id):
        skill = Skill.query.get(skill_id)
        if not skill:
            raise ValueError("技能不存在")

        if not skill.is_installed:
            raise ValueError("技能未安装")

        skill.is_installed = False
        skill.save()
        return skill