"""
工作流任务
"""
from celery import Task
from app.core.tools_bootstrap import ensure_builtin_tools_registered

ensure_builtin_tools_registered()

from app.core.celery_app import celery_app
from app.services.workflow_engine import WorkflowEngine
from app.services.execution_logger import ExecutionLogger
from app.services.alert_service import AlertService
from app.core.database import SessionLocal
from app.core.config import settings
from app.core.exceptions import WorkflowExecutionError, WorkflowPaused
# 导入所有相关模型，确保关系可以正确解析
from app.models.execution import Execution
from app.models.agent import Agent
from app.models.workflow import Workflow
from app.services.execution_budget import merge_budget_for_execution
from app.services.agent_workspace_chat_log import try_append_agent_dialogue_after_success
import asyncio
import time
from typing import Any, Dict, Optional


def _format_task_error(e: Exception) -> str:
    """Celery 任务异常写入 DB 时的可读文案（HTTPException.detail 等）。"""
    detail = getattr(e, "detail", None)
    if isinstance(detail, str) and detail.strip():
        return detail
    if detail is not None and detail != "":
        return str(detail)
    s = str(e).strip()
    return s if s else repr(e)


def _snapshot_to_jsonable(snapshot: dict) -> dict:
    import json as _json

    return _json.loads(_json.dumps(snapshot, default=str))


def _trusted_user_for_execution(db, execution: Optional[Execution]) -> Optional[str]:
    """用于校验 LLM 节点引用的 model_configs 归属（与 Workflow / Agent 所有者一致）。"""
    if not execution:
        return None
    if execution.agent_id:
        ag = db.query(Agent).filter(Agent.id == execution.agent_id).first()
        return ag.user_id if ag else None
    if execution.workflow_id:
        wf = db.query(Workflow).filter(Workflow.id == execution.workflow_id).first()
        return wf.user_id if wf else None
    return None


@celery_app.task(bind=True)
def execute_workflow_task(
    self,
    execution_id: str,
    workflow_id: str,
    workflow_data: dict,
    input_data: dict,
    resume_snapshot: Optional[dict] = None,
):
    """
    执行工作流任务
    
        Args:
        execution_id: 执行记录ID
        workflow_id: 工作流ID
        workflow_data: 工作流数据（nodes和edges）
        input_data: 输入数据
        resume_snapshot: 从挂起恢复时的快照（与 Execution.pause_state 一致）
    """
    db = SessionLocal()
    start_time = time.time()
    execution_logger = None
    
    try:
        # 更新执行状态为运行中
        execution = db.query(Execution).filter(Execution.id == execution_id).first()
        if execution:
            execution.status = "running"
            db.commit()
        
        # 更新任务状态
        self.update_state(state='PROGRESS', meta={'progress': 0, 'status': 'running'})
        
        # 创建执行日志记录器
        execution_logger = ExecutionLogger(execution_id, db)
        execution_logger.info("工作流任务开始执行")
        
        # 创建工作流引擎（传入logger、db、合并后的执行预算）
        budget = merge_budget_for_execution(db, execution) if execution else {}
        trusted_uid = _trusted_user_for_execution(db, execution)
        engine = WorkflowEngine(
            workflow_id,
            workflow_data,
            logger=execution_logger,
            db=db,
            budget_limits=budget,
            trusted_model_config_user_id=trusted_uid,
        )

        max_retries = max(0, int(getattr(settings, "WORKFLOW_TASK_MAX_RETRIES", 0) or 0))
        result: Optional[dict] = None
        for attempt in range(max_retries + 1):
            try:
                result = asyncio.run(
                    engine.execute(input_data, resume_snapshot=resume_snapshot)
                )
                break
            except WorkflowPaused as paused:
                execution = db.query(Execution).filter(Execution.id == execution_id).first()
                if execution:
                    execution.status = "awaiting_approval"
                    execution.pause_state = _snapshot_to_jsonable(paused.snapshot)
                    execution.error_message = None
                    db.commit()
                execution_logger.info(
                    "工作流在审批节点挂起，等待人工决策",
                    data={"pending_node_id": paused.snapshot.get("pending_node_id")},
                )
                return {
                    "status": "awaiting_approval",
                    "execution_id": execution_id,
                    "pending_node_id": paused.snapshot.get("pending_node_id"),
                }
            except WorkflowExecutionError:
                raise
            except Exception as run_e:
                if attempt >= max_retries:
                    raise
                delay = min(30.0, 1.5**attempt)
                if execution_logger:
                    execution_logger.warn(
                        f"工作流执行异常，将退避重试 ({attempt + 1}/{max_retries}): {_format_task_error(run_e)}",
                        data={
                            "error_code": "WORKFLOW_TASK_TRANSIENT_RETRY",
                            "attempt": attempt + 1,
                            "max_retries": max_retries,
                            "delay_sec": round(delay, 2),
                        },
                    )
                time.sleep(delay)
        if result is None:
            raise RuntimeError("工作流执行未返回结果")
        
        # 计算执行时间
        execution_time = int((time.time() - start_time) * 1000)
        
        # 更新执行记录
        if execution:
            execution.status = "completed"
            execution.output_data = result
            execution.execution_time = execution_time
            execution.pause_state = None
            db.commit()

        try_append_agent_dialogue_after_success(
            db, execution, input_data, result, execution_logger
        )

        # 记录执行完成日志
        execution_logger.info(f"工作流任务执行完成，耗时: {execution_time}ms")
        
        # 检查告警规则（异步）
        if execution:
            try:
                asyncio.run(AlertService.check_alerts_for_execution(db, execution))
            except Exception as e:
                # 告警检测失败不影响执行结果
                execution_logger.warn(f"告警检测失败: {str(e)}")
        
        return {
            'status': 'completed',
            'result': result,
            'execution_time': execution_time
        }
    
    except Exception as e:
        execution_time = int((time.time() - start_time) * 1000)
        
        # 记录错误日志
        err_text = _format_task_error(e)
        err_code = getattr(e, "error_code", None)
        if not err_code:
            err_code = (
                "WORKFLOW_EXECUTION_ERROR"
                if isinstance(e, WorkflowExecutionError)
                else "WORKFLOW_TASK_ERROR"
            )
        if execution_logger:
            execution_logger.error(
                f"工作流任务执行失败: {err_text}",
                data={"error_type": type(e).__name__, "error_code": err_code},
            )
        
        # 更新执行记录为失败
        execution = db.query(Execution).filter(Execution.id == execution_id).first()
        if execution:
            execution.status = "failed"
            execution.error_message = err_text
            execution.execution_time = execution_time
            db.commit()
        
        # 检查告警规则（异步）
        if execution:
            try:
                asyncio.run(AlertService.check_alerts_for_execution(db, execution))
            except Exception as e2:
                # 告警检测失败不影响错误处理
                if execution_logger:
                    execution_logger.warn(f"告警检测失败: {str(e2)}")
        
        raise
    
    finally:
        db.close()


@celery_app.task(bind=True)
def resume_workflow_task(
    self,
    execution_id: str,
    decision: str,
    comment: Optional[str] = None,
):
    """在 awaiting_approval 时恢复执行（审批通过/拒绝）。"""
    db = SessionLocal()
    start_time = time.time()
    execution_logger = None

    try:
        execution = db.query(Execution).filter(Execution.id == execution_id).first()
        if not execution:
            return {"status": "error", "detail": "执行记录不存在"}
        if execution.status != "awaiting_approval":
            return {
                "status": "error",
                "detail": f"执行状态不是 awaiting_approval: {execution.status}",
            }
        if not execution.pause_state:
            return {"status": "error", "detail": "缺少 pause_state"}

        if decision not in ("approved", "rejected"):
            return {"status": "error", "detail": "decision 须为 approved 或 rejected"}

        snapshot = execution.pause_state
        base_input: Dict[str, Any] = dict(execution.input_data or {})
        base_input["__hil_decision"] = decision
        if comment:
            base_input["__hil_comment"] = comment

        execution.status = "running"
        execution.error_message = None
        execution.input_data = base_input
        db.commit()

        execution_logger = ExecutionLogger(execution_id, db)
        execution_logger.info("审批恢复执行", data={"decision": decision})

        workflow_data: dict
        wf_key: str
        if execution.workflow_id:
            wf = db.query(Workflow).filter(Workflow.id == execution.workflow_id).first()
            if not wf:
                raise RuntimeError("工作流不存在")
            workflow_data = {"nodes": wf.nodes, "edges": wf.edges}
            wf_key = str(execution.workflow_id)
        elif execution.agent_id:
            ag = db.query(Agent).filter(Agent.id == execution.agent_id).first()
            if not ag or not ag.workflow_config:
                raise RuntimeError("Agent 或工作流配置不存在")
            workflow_data = {
                "nodes": ag.workflow_config.get("nodes", []),
                "edges": ag.workflow_config.get("edges", []),
            }
            wf_key = f"agent_{execution.agent_id}"
        else:
            raise RuntimeError("执行未关联工作流或 Agent")

        self.update_state(state="PROGRESS", meta={"progress": 0, "status": "running"})

        budget = merge_budget_for_execution(db, execution) if execution else {}
        trusted_uid = _trusted_user_for_execution(db, execution)
        engine = WorkflowEngine(
            wf_key,
            workflow_data,
            logger=execution_logger,
            db=db,
            budget_limits=budget,
            trusted_model_config_user_id=trusted_uid,
        )
        max_retries = max(0, int(getattr(settings, "WORKFLOW_TASK_MAX_RETRIES", 0) or 0))
        result: Optional[dict] = None
        for attempt in range(max_retries + 1):
            try:
                result = asyncio.run(
                    engine.execute(base_input, resume_snapshot=snapshot)
                )
                break
            except WorkflowPaused as paused:
                ex2 = db.query(Execution).filter(Execution.id == execution_id).first()
                if ex2:
                    ex2.status = "awaiting_approval"
                    ex2.pause_state = _snapshot_to_jsonable(paused.snapshot)
                    ex2.error_message = None
                    db.commit()
                if execution_logger:
                    execution_logger.info(
                        "工作流再次在审批节点挂起",
                        data={"pending_node_id": paused.snapshot.get("pending_node_id")},
                    )
                return {
                    "status": "awaiting_approval",
                    "execution_id": execution_id,
                    "pending_node_id": paused.snapshot.get("pending_node_id"),
                }
            except WorkflowExecutionError:
                raise
            except Exception as run_e:
                if attempt >= max_retries:
                    raise
                delay = min(30.0, 1.5**attempt)
                if execution_logger:
                    execution_logger.warn(
                        f"恢复执行异常，将退避重试 ({attempt + 1}/{max_retries}): {_format_task_error(run_e)}",
                        data={
                            "error_code": "WORKFLOW_TASK_TRANSIENT_RETRY",
                            "attempt": attempt + 1,
                            "max_retries": max_retries,
                            "delay_sec": round(delay, 2),
                        },
                    )
                time.sleep(delay)
        if result is None:
            raise RuntimeError("工作流执行未返回结果")

        execution_time = int((time.time() - start_time) * 1000)
        ex3 = db.query(Execution).filter(Execution.id == execution_id).first()
        if ex3:
            ex3.status = "completed"
            ex3.output_data = result
            ex3.execution_time = execution_time
            ex3.pause_state = None
            db.commit()

        try_append_agent_dialogue_after_success(
            db, ex3, base_input, result, execution_logger
        )

        if execution_logger:
            execution_logger.info(f"审批后工作流执行完成，耗时: {execution_time}ms")

        if ex3:
            try:
                asyncio.run(AlertService.check_alerts_for_execution(db, ex3))
            except Exception as e:
                if execution_logger:
                    execution_logger.warn(f"告警检测失败: {str(e)}")

        return {
            "status": "completed",
            "result": result,
            "execution_time": execution_time,
        }

    except Exception as e:
        execution_time = int((time.time() - start_time) * 1000)
        err_text = _format_task_error(e)
        err_code = getattr(e, "error_code", None)
        if not err_code:
            err_code = (
                "WORKFLOW_EXECUTION_ERROR"
                if isinstance(e, WorkflowExecutionError)
                else "WORKFLOW_TASK_ERROR"
            )
        if execution_logger:
            execution_logger.error(
                f"审批恢复执行失败: {err_text}",
                data={"error_type": type(e).__name__, "error_code": err_code},
            )
        execution = db.query(Execution).filter(Execution.id == execution_id).first()
        if execution:
            execution.status = "failed"
            execution.error_message = err_text
            execution.execution_time = execution_time
            db.commit()
        if execution:
            try:
                asyncio.run(AlertService.check_alerts_for_execution(db, execution))
            except Exception as e2:
                if execution_logger:
                    execution_logger.warn(f"告警检测失败: {str(e2)}")
        raise

    finally:
        db.close()