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#!/usr/bin/env python3
"""Portable, full-GT CODE evaluation of already-generated DXF artifacts.

This wrapper never executes candidate Python or calls a model/API.
"""
from __future__ import annotations
import argparse
import copy
import csv
import gzip
import hashlib
import json
from pathlib import Path
import re
import sys

from eval import eval_geometric051 as scope
from eval import eval_geometric052_rc5k_final as metric
from eval import v51_sidecar
import ezdxf
from reporting import aggregate, make_record

HERE = Path(__file__).resolve().parent
MODEL_FAILURES = {'empty', 'syntax_error', 'execution_error', 'length_zero',
                  'safety_error', 'resource_error', 'missing_dxf', 'invalid_dxf',
                  'generation_failed'}


def sha(path):
    return hashlib.sha256(path.read_bytes()).hexdigest()


def json_write(path, value):
    with path.open('x', encoding='utf-8') as handle:
        json.dump(value, handle, ensure_ascii=False, indent=2, allow_nan=False)
        handle.write('\n')


def load_population(name, ids_file=None):
    config = json.loads((HERE / 'data/populations.json').read_text())[name]
    archive = HERE / 'data' / config['sidecars']
    body = gzip.decompress(archive.read_bytes())
    provenance = json.loads((HERE / 'PROVENANCE.json').read_text())
    assert hashlib.sha256(body).hexdigest() == provenance['sidecars_original_sha256'][archive.name]
    records = {}
    for line_number, line in enumerate(body.decode('utf-8').splitlines(), 1):
        if not line.strip():
            continue
        record = v51_sidecar._validate_loaded_row(json.loads(line), archive, line_number)
        assert re.fullmatch(r'\d{4}_\d{8}', record['id'])
        assert record['id'] not in records
        records[record['id']] = record
    ids = list(config['ids'])
    assert len(ids) == len(set(ids)) and set(ids) <= set(records)
    if ids_file:
        requested = [line.strip() for line in Path(ids_file).read_text().splitlines() if line.strip()]
        if not requested or len(requested) != len(set(requested)) or not set(requested) <= set(ids):
            raise ValueError('--ids-file must contain distinct IDs from the named population')
        ids = requested
    expected = config.get('expected_camr_denominator')
    if expected is not None and not ids_file:
        assert sum(bool(scope._scope_contracts(records[sid])['full_gt']['annotation_eligible']) for sid in ids) == expected
    return ids, records


def load_failures(path, selected):
    if not path:
        return {}
    result = {}
    for line in Path(path).read_text(encoding='utf-8').splitlines():
        if not line.strip():
            continue
        row = json.loads(line)
        sid, status = str(row['id']), str(row['status'])
        if sid in result:
            raise ValueError('Duplicate ID in failure manifest: ' + sid)
        if status not in MODEL_FAILURES | {'scored'}:
            raise ValueError('Unrecognized/infrastructure/API-unavailable status must not be silently zero-filled: ' + status)
        if sid in selected:
            result[sid] = status
    return result


def run(args):
    ids, sidecars = load_population(args.population, args.ids_file)
    gt_dir = args.gt_dir.resolve() if args.gt_dir else args.dataset_root.resolve() / 'reference_dxf'
    if not args.pred_dir.is_dir():
        raise ValueError('--pred-dir must be an existing directory (it may be empty)')
    failures = load_failures(args.failure_manifest, set(ids))
    # Missing or modified references are infrastructure errors, not model zeros.
    for sid in ids:
        gt = gt_dir / (sid + '.dxf')
        if not gt.is_file() or sha(gt) != sidecars[sid]['gt_dxf_sha256']:
            raise ValueError('Missing or mismatched reference DXF: ' + sid)
    if args.output.exists():
        raise FileExistsError('Refusing to overwrite existing output directory: ' + str(args.output))
    args.output.mkdir(parents=True)
    (args.output / 'raw').mkdir()
    items = []
    for index, sid in enumerate(ids, 1):
        original = sidecars[sid]
        contract = scope._scope_contracts(original)
        gt = gt_dir / (sid + '.dxf')
        pred = args.pred_dir / (sid + '.dxf')
        status = failures.get(sid)
        if status in MODEL_FAILURES:
            row = make_record(sid, contract, status=status)
        elif not pred.is_file():
            if status == 'scored':
                raise ValueError('Manifest says scored but DXF is missing: ' + sid)
            row = make_record(sid, contract, status='missing_dxf')
        else:
            # A supplied artifact must be readable DXF, not merely have the extension.
            try:
                ezdxf.readfile(pred)
            except (ezdxf.DXFError, UnicodeError) as error:
                row = make_record(sid, contract, status='invalid_dxf', error=type(error).__name__)
            else:
                before = sha(pred)
                sidecar = copy.deepcopy(original)
                sidecar['gt_dxf'] = str(gt)
                result = metric.score_dxf_pair(pred, gt, sidecar=sidecar, category=sidecar['category'])
                # Unexpected scoring/infrastructure errors propagate; they are not model failures.
                assert sha(pred) == before, 'Candidate changed during scoring: ' + sid
                row = make_record(sid, contract, result=result)
                raw_path = args.output / 'raw' / (sid + '.json')
                json_write(raw_path, result)
                row.update(raw_result='raw/' + sid + '.json', raw_result_sha256=sha(raw_path), predicted_dxf_sha256=before)
        items.append(row)
        if index % 50 == 0 or index == len(ids):
            print(json.dumps({'progress': index, 'total': len(ids)}), flush=True)
    with (args.output / 'per_item.jsonl').open('x', encoding='utf-8') as handle:
        for row in items:
            handle.write(json.dumps(row, ensure_ascii=False, allow_nan=False) + '\n')
    summary = aggregate(items)
    summary.update(metric_version=metric.METRIC_VERSION, population=args.population,
                   custom_subset=bool(args.ids_file), input_mode='pre-generated DXF artifacts',
                   candidate_programs_executed=False, selected_ids=ids)
    json_write(args.output / 'summary.json', summary)
    with (args.output / 'summary.csv').open('x', encoding='utf-8', newline='') as handle:
        writer = csv.DictWriter(handle, fieldnames=list(summary['metrics']))
        writer.writeheader()
        writer.writerow(summary['metrics'])
    print(json.dumps({k: v for k, v in summary.items() if k != 'selected_ids'}, indent=2))
    return summary


def main():
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument('--pred-dir', type=Path, required=True, help='DXFs named <sample_id>.dxf')
    parser.add_argument('--dataset-root', type=Path, default=HERE.parent, help='CODE directory after reference_dxf.zip extraction')
    parser.add_argument('--gt-dir', type=Path, help='Optional reference_dxf directory override')
    parser.add_argument('--population', choices=['test1045', 'paper1041', 'validation254'], default='test1045')
    parser.add_argument('--ids-file', type=Path, help='Optional explicit subset; summary is marked custom_subset')
    parser.add_argument('--failure-manifest', type=Path, help='Optional JSONL with id/status execution outcomes')
    parser.add_argument('--output', type=Path, required=True, help='A new output directory')
    return run(parser.parse_args())


if __name__ == '__main__':
    main()