# -*- coding: utf-8 -*-
"""windscada L0 数据层: 契约驱动加载 + 校验门 (统一技术栈, 双翼共用).
铁律: 契约外列不加载; 校验门不过不进分析; 稀发数字量按类判活."""
import pandas as pd, pathlib, yaml
from src.windscada.config import farm          # config 属后端模块(P4)，暂留原路径

def contract(cfg=None):
    cfg = cfg or farm()
    return yaml.safe_load(pathlib.Path(cfg['contract']).read_text(encoding='utf-8'))

def contracted_cols(cfg=None, groups=None):
    c = contract(cfg)
    out = []
    for g, chans in c['groups'].items():
        if groups and g not in groups:
            continue
        out += [name for name, meta in chans.items() if meta['liveness'] == '活']
    return sorted(set(out))

def gate(cfg=None):
    """G 门: 契约存在 + 活列占比 + 死嫌清单. 不过门 → 下游拒跑 (响亮)."""
    c = contract(cfg)
    total = sum(len(v) for v in c['groups'].values())
    alive = sum(1 for v in c['groups'].values() for m in v.values() if m['liveness'] == '活')
    ok = alive / max(total, 1) >= 0.8
    return dict(ok=ok, alive=alive, total=total, dead=c.get('dead_suspect', []),
                note=f"契约 {c['version']}: 活 {alive}/{total}; 未契约列 {c['n_cols_uncontracted']} 已登记不假装覆盖")

def load_10min(turbine, cfg=None, groups=None):
    """一台的 10min 数据（**CSV 与 MDB 两种形态都认**，用户令 2026-09-19）。

    取数走 `scada_source`：`<src_10min>/<台>.csv` 在位就用 CSV；该台没有 CSV 才回落
    `data/raw/<场站>/scada_mdb/<年>年/<月>月/*.mdb`（现场年度归档形态）。用的哪种记在
    返回表的 `attrs['scada_source']`（并在首次使用时打一行，不静默换源）。
    """
    cfg = cfg or farm()
    g = gate(cfg)
    if not g['ok']:
        raise RuntimeError(f"L0 校验门不过: {g['note']}")
    c = contract(cfg)
    want = [c['ts_col']] + contracted_cols(cfg, groups)
    from app_ETL.app_ETL_guanlan import scada_source as SS
    d = SS.load('10min', turbine, columns=want, cfg=cfg)
    src = str(d.attrs.get('scada_source') or '?')
    _note_source(src)
    # 契约外列不加载（两形态统一）—— CSV 侧原先在 read_csv 时用 usecols 做到, MDB 侧在这里收口
    keep = [x for x in d.columns if x in want]
    d = d.loc[:, keep].copy()
    if not keep:
        raise RuntimeError(f'{turbine}: 源件里没有契约列 (想要 {want[:4]}…; 实际列 {list(d.columns)[:6]}…)')
    ts = c['ts_col']
    d[ts] = pd.to_datetime(d[ts], errors='coerce')
    out = d.dropna(subset=[ts]).rename(columns={ts: 'ts'})
    out.attrs['scada_source'] = src
    return out


_NOTE_DONE: set = set()


def _note_source(src: str) -> None:
    """首次用到某种形态时说明一次（让人知道这次重算是从 CSV 还是从 MDB 取的）。"""
    if src in _NOTE_DONE:
        return
    _NOTE_DONE.add(src)
    print(f'  [i] SCADA 源形态: {src}'
          + ('（<src_10min>/<台>.csv）' if src == 'csv' else '（scada_mdb 年度归档库）'), flush=True)


def source_report(cfg=None) -> dict:
    """本机 SCADA 收资形态盘点（页面/自检用）: 各形态件数 + 逐台会走哪种。"""
    from app_ETL.app_ETL_guanlan import scada_source as SS
    cfg = cfg or farm()
    out = {}
    for cls in ('10min', '1min'):
        s = SS.sources(cls, cfg)
        turbs = SS.turbines(cls, cfg)
        kinds = {}
        for t in turbs:
            k = SS.source_of(cls, t, cfg) or 'none'
            kinds[k] = kinds.get(k, 0) + 1
        out[cls] = dict(n_csv=s['n_csv'], n_mdb=s['n_mdb'], n_zip=s['n_zip'], n_turbines=len(turbs),
                        by_source=kinds, csv_dir=str(s['csv_dir']), mdb_root=str(s['mdb_root']))
    return out