"""Versioned offline location paths. Administrative geography is not an ACL boundary."""
import json
from pathlib import Path

DATA = json.loads((Path(__file__).parent/'web/data/geography.json').read_text(encoding='utf8'))


def normalize(value, clean):
    if not isinstance(value, dict):
        raise ValueError('地域信息格式不正确')
    mode = value.get('mode')
    if mode not in ('china', 'world', 'custom'):
        raise ValueError('请选择中国、世界或自定义地域')
    result = dict(version=1, mode=mode, dataset=DATA['version'], body='地球', countryCode='', country='',
                  provinceCode='', cityCode='', districtCode='', province='', city='', district='', path='')
    if mode == 'china':
        result.update(countryCode='CN', country='中国')
        children = DATA['china']
        manual = False
        for field in ('province', 'city', 'district'):
            code = value.get(field+'Code', '')
            if not isinstance(code, str): raise ValueError('地域编码格式不正确')
            if manual:
                result[field] = clean(value.get(field, ''), 100)
                continue
            if not code:
                if any(value.get(k+'Code') for k in ('city','district') if ('province','city','district').index(k)>('province','city','district').index(field)):
                    raise ValueError('请先选择上级地区')
                continue
            item = next((x for x in children if x['code']==code), None)
            if not item: raise ValueError('地区不属于所选上级，请重新选择')
            result[field+'Code'], result[field] = item['code'], item['name']
            manual = item.get('manual', False)
            children = item.get('children', [])
    elif mode == 'world':
        code = value.get('countryCode', '')
        if not isinstance(code, str) or code not in DATA['countries']: raise ValueError('请选择国家或地区')
        if code == 'CN': raise ValueError('中国地区请使用中国分级选择')
        result.update(countryCode=code, country=DATA['countries'][code])
        for field in ('province','city','district'):
            result[field] = clean(value.get(field, ''), 100)
    else:
        result['body'] = clean(value.get('body', '地球'), 100, True)
        for field in ('country','province','city','district'):
            result[field] = clean(value.get(field, ''), 100)
        result['path'] = clean(value.get('path', ''), 1000)
    return result


def apply(item, data, old, clean, problem, prefix=''):
    key = prefix+'Geography' if prefix else 'geography'
    if key not in data:
        if key in (old or {}):
            previous = old[key]
            names = {f:prefix+f.title() if prefix else f for f in ('country','province','city','district')}
            if any(k in data and data[k] != old.get(k,'') for k in names.values()):
                # An older client can edit text but cannot keep now-inconsistent codes.
                item[key] = normalize(dict(mode='custom',body=previous.get('body','地球'),
                    path=previous.get('path',''),**{f:data.get(k,old.get(k,'')) for f,k in names.items()}),clean)
            else: item[key] = previous
        return
    try: result = normalize(data[key], clean)
    except ValueError as error: raise problem(str(error))
    item[key] = result
    for field in ('country','province','city','district'):
        item[prefix+field.title() if prefix else field] = result[field]