"""统一收尾能力不足、资源缺失和动作修正失败

这里只整理内部失败原因，面向用户的说明由回答节点交给模型总结，代码中不写死给用户的文案
"""

from app.processor.base import BaseNode
from app.processor.state import QueryState


def failure_notice(state: QueryState) -> str:
    """汇总上游记录的失败原因、最近一次修正分析和校验错误，作为交给模型的事实说明"""
    facts = []
    if reason := state.get("failure_reason"):
        facts.append(reason)
    plan = state.get("repair_plan")
    if plan is not None and plan.reason not in facts:
        facts.append(f"失败分析：{plan.reason}")
    if errors := state.get("validation_errors"):
        facts.append("校验错误：" + "；".join(error.message for error in errors))
        facts.append(f"已自动修正 {state.get('retry_count', 0)} 次")
    detail = "\n".join(facts) if facts else "没有记录具体原因"
    return f"本次修改请求没有执行，内部原因如下：\n{detail}"


class FallbackNode(BaseNode):
    name = "fallback_node"

    def process(self, state: QueryState) -> QueryState:
        # 浅拷贝状态
        updated_state: QueryState = state.copy()
        notice = failure_notice(state)
        self.logger.warning(notice)

        # 将任务标记为最终失败，由回答节点向用户说明原因
        updated_state["status"] = "failed"
        updated_state["failure_reason"] = notice
        updated_state["notice"] = notice
        # 显式标记校验未通过，防止残留动作被当作可执行结果
        updated_state["validation_passed"] = False
        # 清空旧模拟快照，避免失败结果中仍携带之前的成功快照
        updated_state["simulated_screen"] = None

        # 返回统一的失败状态，保留原动作和错误信息供排查
        return updated_state