"""
异常诊断模型适配器。定时运行诊断并将结果写入共享状态。
"""
import logging
import os
import sys
import time
from pathlib import Path
from typing import Optional

import pandas as pd

from core.config import PipelineConfig
from core.data_provider import DataProvider
from core.shared_state import SharedState

logger = logging.getLogger(__name__)


class DiagnosisAdapter:
    def __init__(
        self,
        plant: str,
        data_provider: DataProvider,
        shared_state: SharedState,
        config: PipelineConfig,
    ):
        self.plant = plant
        self.data_provider = data_provider
        self.shared_state = shared_state
        self.config = config

        diag_root = str(config.diagnosis_root.resolve())

        # 加载诊断模型配置
        if diag_root not in sys.path:
            sys.path.insert(0, diag_root)
        os.chdir(diag_root)
        try:
            from config import config as diag_config

            diag_config.load(plant)
        finally:
            os.chdir(str(config.diagnosis_root.parent.parent))

        self._diag_config = diag_config
        self._diag_root = diag_root

        # 加载 PLC 点位列表
        points_file = Path(diag_root) / plant / "input_format.txt"
        self._plc_points = self._load_plc_points(str(points_file))

        # 延迟初始化 diagnoser（模型权重较重）
        self._diagnoser = None

    def _ensure_diagnoser(self):
        if self._diagnoser is not None:
            return
        old_cwd = os.getcwd()
        os.chdir(self._diag_root)
        try:
            from test import WaterPlantDiagnoser

            self._diagnoser = WaterPlantDiagnoser()
        finally:
            os.chdir(old_cwd)

    @staticmethod
    def _load_plc_points(filepath: str) -> list:
        points = []
        with open(filepath, "r", encoding="utf-8-sig") as f:
            for line in f:
                pt = line.strip()
                if pt and pt.lower() != "index":
                    points.append(pt)
        logger.info(f"加载了 {len(points)} 个 PLC 点位")
        return points

    def run_once(self) -> dict:
        """运行一次诊断并发布结果。"""
        self._ensure_diagnoser()

        # 获取 40 分钟历史数据
        df = self.data_provider.query_points_history(
            self._plc_points,
            duration_minutes=self.config.diagnosis_interval_minutes,
        )

        # 转为 api_predict 期望的格式：第一列为 time，后续为传感器值
        # 并用线性插值补齐缺失，确保降采样后有足够的数据行
        df = df.reset_index().rename(columns={"index": "time"})
        df["time"] = pd.to_datetime(df["time"], errors="coerce")
        df = df.dropna(subset=["time"]).sort_values("time")

        # 以 4s 间隔重建完整时间轴，插值填充间隙
        if len(df) >= 2:
            full_idx = pd.date_range(start=df["time"].min(), end=df["time"].max(), freq="4s")
            df = df.set_index("time")
            df = df.reindex(full_idx)
            df = df.interpolate(method="time", limit_direction="both")
            df = df.ffill().bfill()
            df = df.reset_index().rename(columns={"index": "time"})

        # 执行诊断
        result = self._diagnoser.api_predict(df, mode="auto")

        # 发布到共享状态
        self.shared_state.publish("diagnosis_results", result)
        logger.info(f"诊断完成: status={result.get('status')}")
        return result

    def run_loop(self, interval_minutes: Optional[int] = None):
        """定时循环运行诊断。"""
        interval = interval_minutes or self.config.diagnosis_interval_minutes
        while True:
            try:
                self.run_once()
            except Exception as e:
                logger.error(f"诊断异常: {e}", exc_info=True)
            time.sleep(interval * 60)