"""Validate exported human macro demonstrations without inventing labels."""
import json
import math
from pathlib import Path


def load_demonstrations(filename):
    payload = json.loads(Path(filename).read_text(encoding='utf-8-sig'))
    if isinstance(payload, dict):
        records = payload.get('commanderDemonstrations', payload.get('stats', {}).get('commanderDemonstrations', []))
    else:
        records = payload
    if not isinstance(records, list):
        raise ValueError('Expected commanderDemonstrations array')
    rows, labels = [], []
    for record in records:
        if not record.get('trainable'):
            continue
        row, action = record.get('observation'), record.get('action', {})
        if not isinstance(row, list) or len(row) != 116 or not all(isinstance(v, (int, float)) and math.isfinite(v) and -1 <= v <= 1 for v in row):
            raise ValueError('Invalid 116-feature demonstration observation')
        categories = [action.get(k) for k in ['command', 'formation', 'strategy', 'group', 'task']]
        if not all(type(v) is int and 0 <= v < width for v, width in zip(categories, [11, 4, 7, 9, 5])):
            raise ValueError('Invalid macro demonstration category')
        if action.get('ttl') not in [2.5, 5, 10] or not all(isinstance(action.get(k), (int, float)) and math.isfinite(action[k]) for k in ['x', 'y']):
            raise ValueError('Invalid macro demonstration position/TTL')
        xy = [max(-.98, min(.98, (action['x'] - 30) / 520 - 1)), max(-.98, min(.98, (action['y'] - 47) / 285.5 - 1))]
        rows.append(row)
        labels.append(categories + [[2.5, 5, 10].index(action['ttl'])] + xy)
    return rows, labels, {'records': len(records), 'accepted': len(rows), 'skipped': len(records) - len(rows)}