"""Publish a fresh-source body tie candidate only if its change is rigid pose."""
import argparse
import copy
import json
import math
import os
from pathlib import Path
import tempfile
import time
import sys
root=Path(__file__).resolve().parents[1]
sys.path.insert(0,str(root/'src/backend'if (root/'src/backend').is_dir()else root))
from server import component_surface_z_at_xy
from mesh_surface_aliases import prism_surface_view


def merge_pose(current, candidate):
    result=copy.deepcopy(current)
    old={g['id']:g for g in current['rebar_groups']if g.get('source_body_tie_binding')}
    new={g['id']:g for g in candidate['rebar_groups']if g.get('source_body_tie_binding')}
    if old.keys()!=new.keys():raise ValueError('body tie occurrences changed')
    if current['concrete_components']!=candidate['concrete_components']:raise ValueError('concrete changed')
    changed=[];removed=0
    hosts={c['id']:prism_surface_view(c)for c in current['concrete_components']}
    station_key=lambda s:json.dumps([s['station_m'],s['domain'],s['section_projection']],sort_keys=True)
    for key,g in old.items():
        n=new[key]
        for field in ['diameter_mm','unit_length_m','host_component_ids']:
            if g[field]!=n[field]:raise ValueError('not a pose-only change: '+field)
        for field in ['section','host_role']:
            if g['source_body_tie_binding'][field]!=n['source_body_tie_binding'][field]:
                raise ValueError('source station binding changed: '+field)
        binding=n['source_body_tie_binding']
        if not binding['pose_rule'].startswith('body-source-wrap-v5:'):raise ValueError('unexpected pose rule')
        previous={station_key(s):(p,i)for i,(s,p)in enumerate(zip(g['source_body_tie_binding']['stations'],g['instance_paths_m']))}
        following={station_key(s)for s in binding['stations']}
        excluded={station_key(s)for s in binding.get('excluded_unpaired_candidates',[])
                  if s['cycle_pair'].get('outside_pair_domain')and not s['cycle_pair']['pass']}
        if following-set(previous)or set(previous)-following-excluded:raise ValueError('unexplained station addition/removal')
        if n['count']!=len(n['instance_paths_m'])or len(binding['stations'])!=n['count']:raise ValueError('count metadata')
        if len(binding['engagement'])!=n['count']:raise ValueError('missing per-bar audit')
        if n['occurrence_instance_ids']!=[n['host_component_ids'][0]]*n['count']:raise ValueError('occurrence mismatch')
        removed+=len(previous)-len(following)
        for s,q,e in zip(binding['stations'],n['instance_paths_m'],binding['engagement']):
            p,old_index=previous[station_key(s)]
            if len(p)!=len(q):raise ValueError('detail topology changed')
            for i in range(len(p)):
                for j in range(i):
                    if abs(math.dist(p[i],p[j])-math.dist(q[i],q[j]))>1e-8:
                        raise ValueError('non-rigid fabrication change')
            centre=lambda path:[(min(v[i]for v in path)+max(v[i]for v in path))/2 for i in range(3)]
            old_c=centre(p);new_c=centre(q)
            if math.dist(old_c,new_c)>1e-7:
                pair=e['cycle_pair']
                if binding['axis_proof']['axis']!='return_legs':raise ValueError('open-U moved')
                anchor=pair.get('centre_station_m',s['station_m'])
                if abs(new_c[0]-s['portal_slope']*new_c[1]-anchor)>1e-7 or abs(new_c[1]-old_c[1])>1e-7:
                    raise ValueError('not the authored pair centre')
                host=hosts[n['host_component_ids'][0]]
                old_z=component_surface_z_at_xy(host,'top_z_m',*old_c[:2]);new_z=component_surface_z_at_xy(host,'top_z_m',*new_c[:2])
                old_e=g['source_body_tie_binding'].get('engagement',[])
                shift_keys=('diameter_face_centre_shift_m','source_model_centre_shift_m')
                old_shift=sum(old_e[old_index]['cycle_pair'].get(k,0)for k in shift_keys)if old_e else 0
                shift=sum(pair.get(k,0)for k in shift_keys)-old_shift
                if old_z is None or new_z is None or abs(new_c[2]-old_c[2]-(new_z-old_z)-shift)>1e-6:
                    raise ValueError('unexplained height shift')
        if g['instance_paths_m']!=n['instance_paths_m']:changed.append(key)
    result['rebar_groups']=[copy.deepcopy(new[g['id']])if g['id']in new else g for g in result['rebar_groups']]
    result['drawingEvidence'].setdefault('preview_geometry',{})['rebar_groups']=copy.deepcopy(result['rebar_groups'])
    result['drawingEvidence']['body_tie_pose_audit']={'rule':'body-source-wrap-v5','changed_groups':changed,
        'concrete_and_other_rebar_preserved':True,'detail_lengths_preserved':True,
        'excluded_unpaired_end_candidates':removed,'centres_bound_to_authored_cycle_pairs':True,
        'engineering_approval':False}
    return result


def main():
    p=argparse.ArgumentParser(description=__doc__);p.add_argument('job',type=Path);p.add_argument('candidate',type=Path)
    args=p.parse_args();raw=args.job.read_bytes();job=json.loads(raw)
    if job.get('status')not in ('completed','awaiting_feedback','failed'):raise ValueError('active job')
    result=merge_pose(job['result'],json.loads(args.candidate.read_text())['result'])
    if args.job.read_bytes()!=raw:raise ValueError('concurrent job update')
    backup=args.job.with_name(args.job.stem+f'.before-body-face-return-{time.time_ns()}.json')
    with backup.open('xb')as stream:stream.write(raw)
    job.update(result=result,partialResult=copy.deepcopy(result),geometryRevision=time.time_ns())
    with tempfile.NamedTemporaryFile(mode='w',dir=args.job.resolve().parent,delete=False)as stream:
        json.dump(job,stream,ensure_ascii=False,allow_nan=False);temporary=stream.name
    if args.job.read_bytes()!=raw:raise ValueError('concurrent job update before publish')
    os.replace(temporary,args.job.resolve())
    print(json.dumps({'backup':str(backup),'audit':result['drawingEvidence']['body_tie_pose_audit']},ensure_ascii=False))


if __name__=='__main__':main()