"""显式证券主表与配置契约；示例配置不冒充任何产品接口。"""
import json
from datetime import date

master = {'US:ALFA': ('US', 'USD'), 'US:BETA': ('US', 'USD'),
          'HK:00005': ('HK', 'HKD'), 'CN:600000': ('CN', 'CNY')}
sources = {'fixture_us': {'US'}, 'fixture_hk': {'HK'}, 'fixture_cn': {'CN'}}


def validate(config):
    errors = []
    if not config['symbols']:
        errors.append('symbols_empty')
    try:
        if date.fromisoformat(config['start']) >= date.fromisoformat(config['end']):
            errors.append('date_order')
    except ValueError:
        errors.append('date_format')
    if config['cash'] <= 0:
        errors.append('cash')
    if config['frequency'] != '1d':
        errors.append('frequency')
    for symbol in config['symbols']:
        if symbol not in master:
            errors.append('unknown_symbol:' + symbol)
            continue
        market, currency = master[symbol]
        if market != config['engine']:
            errors.append('engine:' + symbol)
        if market not in sources.get(config['source'], set()):
            errors.append('source:' + symbol)
        if currency != config['currency']:
            errors.append('currency:' + symbol)
    return errors


base = {'symbols': ['US:ALFA', 'US:BETA'], 'engine': 'US', 'currency': 'USD',
        'source': 'fixture_us', 'start': '2026-01-01', 'end': '2026-06-30',
        'cash': 10000, 'frequency': '1d'}
assert validate(base) == []
mixed = dict(base, symbols=['US:ALFA', 'HK:00005'])
assert validate(mixed) == ['engine:HK:00005', 'source:HK:00005', 'currency:HK:00005']
assert validate(dict(base, cash=0)) == ['cash']
assert validate(dict(base, start='2026-07-01')) == ['date_order']
assert validate(dict(base, symbols=['ALFA'])) == ['unknown_symbol:ALFA']
assert validate(dict(base, symbols=[])) == ['symbols_empty']
print(json.dumps({'valid': validate(base), 'mixed': validate(mixed),
                  'empty_symbols': validate(dict(base, symbols=[])),
                  'zero_cash': validate(dict(base, cash=0)),
                  'unknown': validate(dict(base, symbols=['ALFA']))}))