"""Read registered channel context. The persona selects; this module never guesses intent."""
import json
from pathlib import Path

ROOT = Path(__file__).resolve().parents[2]

def load_channels(channel=None, root=ROOT):
    data = json.loads((root / 'routing/persona-channel-context-map.json').read_text())
    if data['map_id'] != 'ZY-PERSONA-CHANNEL-CONTEXT-001':
        raise ValueError('CHANNEL_CONTEXT_MAP_INVALID')
    rows = data['channels']
    if len({c['id'] for c in rows}) != len(rows):
        raise ValueError('CHANNEL_IDS_AMBIGUOUS')
    registry = json.loads((root / 'routing/fifth-domain-number-registry.json').read_text())
    numbers = {entry['id']: entry for entry in registry['registrations']}
    for item in rows:
        profile = json.loads((root / item['profile']).read_text())
        if item['id'] not in numbers or profile['channel_id'] != item['id']:
            raise ValueError('CHANNEL_NOT_REGISTERED')
        registered = numbers[item['id']]
        if profile['world_path'] != registered['world_path']:
            raise ValueError('CHANNEL_PATH_MISMATCH')
        item['world_path'] = profile['world_path']
    if channel is not None and channel not in {c['id'] for c in rows}:
        raise ValueError('UNKNOWN_PRIVATE_CHANNEL')
    return {**data, 'selected_channel': next((c for c in rows if c['id'] == channel), None),
            'selection_state': 'PERSONA_SELECTED' if channel else 'PERSONA_INTERPRETATION_REQUIRED',
            'authority_granted': False}