"""R646：USD/HKD/CNY资格分账，FX只展示，不建立混币种交易账。"""
from decimal import Decimal as D
SUPPORTED={'USD','HKD','CNY'}

def pool(currency,winners,initial,qty,price,fee,mark):
    if currency not in SUPPORTED or type(winners) is not int or winners<0:raise ValueError('unknown currency or count')
    if winners<5:return {'currency':currency,'status':'waiting_eligibility','NAV':None,'cash':None,'shares':None}
    initial,price,fee,mark=map(lambda x:D(str(x)),[initial,price,fee,mark])
    if any(not x.is_finite() for x in [initial,price,fee,mark]) or initial<=0 or price<=0 or mark<=0 or fee<0 or type(qty) is not int or qty<0:raise ValueError('invalid pool inputs')
    cash=initial-qty*price-fee
    if cash<0:raise ValueError('unfunded pool')
    assert cash+qty*price==initial-fee
    nav=cash+qty*mark
    return {'currency':currency,'status':'active','initial':initial,'cash':cash,'shares':qty,'NAV':nav,'return':nav/initial-1}
def native_sum(rows):
    active=[r for r in rows if r['status']=='active']
    if len({r['currency'] for r in active})>1:raise ValueError('cross-currency native aggregation')
    return sum((r['NAV'] for r in active),D(0))
def display(rows,rates):
    active=[r for r in rows if r['status']=='active']
    if any(r['currency'] not in rates for r in active):return {'status':'FX_unknown','USD_value':None}
    values={c:D(str(v)) for c,v in rates.items()}
    if any(c not in SUPPORTED or not v.is_finite() or v<=0 for c,v in values.items()):raise ValueError('invalid FX metadata')
    if 'USD' in values and values['USD']!=1:raise ValueError('USD numeraire must equal one')
    return {'status':'display_only','USD_value':sum((r['NAV']*values[r['currency']] for r in active),D(0))}

rows=[pool('USD',5,1000,2,100,1,110),pool('HKD',4,None,0,None,None,None),pool('CNY',5,2000,10,20,2,21)]
assert rows[0]['NAV']==D(1019) and rows[0]['return']==D('.019')
assert rows[1]['status']=='waiting_eligibility' and rows[1]['cash'] is None
assert rows[2]['NAV']==D(2008) and rows[2]['return']==D('.004')
assert display(rows,{'USD':1,'CNY':'.14'})=={'status':'display_only','USD_value':D('1300.12')}
assert display(rows,{'USD':1})['status']=='FX_unknown'
try:native_sum(rows)
except ValueError:pass
else:raise AssertionError('unconverted NAVs added')
for currency in ['EUR','UNKNOWN',None,'']:
    try:pool(currency,5,1000,1,100,1,110)
    except ValueError:pass
    else:raise AssertionError('unknown currency treated as valid pool')
try:display(rows,{'USD':1,'CNY':'NaN'})
except ValueError:pass
else:raise AssertionError('nonfinite FX displayed')
print('USD cash=799 shares=2 NAV=1019 return=1.9% CNY cash=1798 shares=10 NAV=2008 return=0.4%')
print('HKD winners=4 status=waiting_eligibility capital_not_created=True synthetic_CNY_to_USD=0.14 display_USD=1300.12')
print('native_cross_currency_sum=rejected missing_FX=unknown display_is_not_FX_backtest=True')