"""Mapper faithfulness audit: for identity pass-through fields (dims, counts,
thicknesses) compare the RAW cert value to what EpcPropertyDataMapper produced.
Any mismatch is a mapper bug silently feeding the SAP engine wrong inputs."""
from __future__ import annotations
import json
from collections import defaultdict
from datatypes.epc.domain.mapper import EpcPropertyDataMapper
CORPUS="backend/epc_api/json_samples/RdSAP-Schema-21.0.1/corpus.jsonl"
def gv(x): return x.get('value') if isinstance(x,dict) else x
def num(x):
    x=gv(x)
    if x is None: return None
    s=str(x).lower().replace('mm','').replace('m2','').strip()
    try: return float(s)
    except: return s  # keep strings like 'measured'/'NI' for equality
mism=defaultdict(list)
n=0
for line in open(CORPUS):
    d=json.loads(line)
    try: epc=EpcPropertyDataMapper.from_api_response(d)
    except Exception: continue
    n+=1; u=d.get('uprn')
    # top-level counts
    checks=[('door_count', d.get('door_count'), epc.door_count),
            ('habitable', d.get('habitable_room_count'), getattr(epc,'habitable_room_count',None)),
            ('led', d.get('led_fixed_lighting_bulbs_count'), epc.led_fixed_lighting_bulbs_count),
            ('cfl', d.get('cfl_fixed_lighting_bulbs_count'), epc.cfl_fixed_lighting_bulbs_count),
            ('incand', d.get('incandescent_fixed_lighting_bulbs_count'), epc.incandescent_fixed_lighting_bulbs_count)]
    for name,rv,ev in checks:
        if rv is not None and ev is not None and num(rv)!=num(ev):
            mism[name].append((u,rv,ev))
    # per-building-part fabric
    rbps=d.get('sap_building_parts') or []; ebps=epc.sap_building_parts or []
    for i,rbp in enumerate(rbps):
        if i>=len(ebps): 
            mism['DROPPED_building_part'].append((u,len(rbps),len(ebps))); break
        ebp=ebps[i]
        for name,rv,ev in [('wall_thick',rbp.get('wall_thickness'),getattr(ebp,'wall_thickness_mm',None)),
                           ('wall_ins_thick',rbp.get('wall_insulation_thickness'),getattr(ebp,'wall_insulation_thickness',None)),
                           ('roof_ins_thick',rbp.get('roof_insulation_thickness'),getattr(ebp,'roof_insulation_thickness',None)),
                           ('wall_con',rbp.get('wall_construction'),getattr(ebp,'wall_construction',None)),
                           ('wall_ins_type',rbp.get('wall_insulation_type'),getattr(ebp,'wall_insulation_type',None))]:
            if rv is not None and ev is not None and num(rv)!=num(ev):
                mism[name].append((u,rv,ev))
    # windows: count + total area
    rw=d.get('sap_windows') or []; ew=epc.sap_windows or []
    if len(rw)!=len(ew): mism['window_count'].append((u,len(rw),len(ew)))
    ra=sum((gv(w.get('window_width')) or 0)*(gv(w.get('window_height')) or 0) for w in rw)
    ea=sum((float(w.window_width) if w.window_width else 0)*(float(w.window_height) if w.window_height else 0) for w in ew)
    if abs(ra-ea)>0.02: mism['window_area'].append((u,round(ra,2),round(ea,2)))
print(f"audited {n} certs")
print("=== field mismatches (raw cert vs EpcPropertyData) ===")
for k,v in sorted(mism.items(), key=lambda x:-len(x[1])):
    print(f"\n[{len(v):4d}] {k}")
    for u,rv,ev in v[:5]: print(f"      {u}: raw={rv} epc={ev}")
if not mism: print("  (no mismatches — mapper is identity-faithful on all checked fields)")