"""独立核验DJ091—100：用整数分和Decimal复算家庭账表示例。"""
from decimal import Decimal as D
from pathlib import Path
import json


def calculate():
    out={}
    # 091：内部本金守恒，另扣手续费时净资产仅减少费用。
    a,b,transfer,fee=10000,5000,3000,5
    out['DJ091']={'before':a+b,'a_after':a-transfer,'b_after':b+transfer,
                  'after':a-transfer+b+transfer,'with_fee':a-transfer-fee+b+transfer}
    assert out['DJ091']['before']==out['DJ091']['after'] and out['DJ091']['with_fee']==14995
    # 092：信用卡消费形成负债，还本不再损耗净资产。
    cash,expense=8000,1200
    out['DJ092']={'net_after_purchase':cash-expense,'cash_after_repayment':cash-expense,
                  'debt_after_repayment':expense-expense,'with_extra_fee':cash-expense-20}
    assert out['DJ092']['net_after_purchase']==out['DJ092']['cash_after_repayment']
    # 093：两种预算归属都回到相同两月净现金，双冲会多减800。
    dec_income,jan_income,dec_expense,jan_expense,refund=10000,10000,6000,6200,800
    out['DJ093']={'dec_cash':dec_income-dec_expense,'jan_cash':jan_income-jan_expense+refund,
                  'total_cash':dec_income+jan_income-dec_expense-jan_expense+refund,
                  'origin_month_expense':dec_expense-refund,'receipt_month_expense':jan_expense-refund,
                  'retained_expense':dec_expense+jan_expense-refund,
                  'incorrect_double_refund_surplus':dec_income+jan_income-(dec_expense-refund)-(jan_expense-refund)}
    assert out['DJ093']['total_cash']==8600 and out['DJ093']['incorrect_double_refund_surplus']==9400
    # 094：由现金转应收，再确认个人承担200，回款不再创造收入。
    original,advance,approved=10000,1800,1600
    out['DJ094']={'cash_after_advance':original-advance,'net_before_approval':original-advance+advance,
                  'net_after_approval':original-advance+approved,'final_cash':original-advance+approved,
                  'personal_cost':advance-approved}
    assert out['DJ094']['net_before_approval']-out['DJ094']['final_cash']==out['DJ094']['personal_cost']
    # 095：本金资产转换，费用与市值变化分别核对。
    cash,payment,fee=12000,3000,30
    shares=D(payment-fee)/D('1')
    out['DJ095']={'cash_after':cash-payment,'initial_units':int(shares),'initial_assets':cash-fee,
                  'market_value_after_rise':str(shares*D('1.1')),
                  'total_assets_after_rise':str(D(cash-payment)+shares*D('1.1')),
                  'net_change_after_rise':str(D(cash-payment)+shares*D('1.1')-D(cash))}
    assert D(out['DJ095']['net_change_after_rise'])==D('267')
    # 096：预留属于资金用途，实际支出只发生一次。
    monthly,months,target=600,12,7200
    schedule=[monthly*i for i in range(1,months+1)]
    out['DJ096']={'reserves_before_payment':schedule,'after_payment':schedule[-1]-target,
                  'lower_bill_carryover':schedule[-1]-6000,'seven_equal_payments':str((D(target)/7).quantize(D('.01'))),
                  'seven_payments_at_600':monthly*7,'shortfall':target-monthly*7}
    assert out['DJ096']['after_payment']==0 and out['DJ096']['lower_bill_carryover']==1200
    # 097：唯一账户汇总与分摊视图应相等。
    personal_a,personal_b,joint=30000,20000,40000
    out['DJ097']={'family':personal_a+personal_b+joint,'a_share':personal_a+joint//2,
                  'b_share':personal_b+joint//2,'wrong_double_joint':personal_a+personal_b+joint*2}
    assert out['DJ097']['a_share']+out['DJ097']['b_share']==out['DJ097']['family']
    # 098：本息、估值和提前还本分开桥接。
    house,cash,debt,principal,interest=1000000,100000,600000,3000,2000
    after_cash=cash-principal-interest;after_debt=debt-principal
    out['DJ098']={'before_net':house+cash-debt,'after_cash':after_cash,'after_debt':after_debt,
                  'after_net':house+after_cash-after_debt,'after_valuation_rise':house+20000+after_cash-after_debt,
                  'after_extra_principal':house+(after_cash-20000)-(after_debt-20000),
                  'original_case_sale_cash':house-40000-debt+cash}
    assert out['DJ098']['before_net']-out['DJ098']['after_net']==interest
    assert out['DJ098']['after_extra_principal']==out['DJ098']['after_net']
    # 099：原币、预算汇率、结算汇率及未退费用分别核对。
    foreign,budget_rate,actual_rate,fee_rate,refund_rate=map(D,('100','7.00','7.12','.015','7.05'))
    actual=foreign*actual_rate;budget=foreign*budget_rate;fee=actual*fee_rate
    out['DJ099']={k:str(v) for k,v in {'budget':budget,'settled':actual,'fee':fee,'total':actual+fee,
                  'over_budget':actual+fee-budget,'refund':foreign*refund_rate,'remaining_cost':actual+fee-foreign*refund_rate,
                  'unspent_currency_valuation_change':D('200')*(actual_rate-budget_rate)}.items()}
    assert D(out['DJ099']['over_budget'])==D('22.68') and D(out['DJ099']['remaining_cost'])==D('17.68')
    # 100：三个错误分别从同一基准出发，不能错误地视为同一组并发交易。
    baseline=1500000+1200000-800000-100000
    out['DJ100']={'baseline_cents':baseline,'after_fee_cents':baseline-2000,
                  'duplicate_salary_cents':baseline+1200000,'pending_refund_as_cash_cents':baseline+50000,
                  'matched_internal_transfer_net':-200000+200000}
    assert out['DJ100']['baseline_cents']==1800000 and out['DJ100']['matched_internal_transfer_net']==0
    return out


if __name__=='__main__':
    result={'passed':True,'method':'整数分、Decimal与逐账户守恒核对；仅验证构造算例，不替代合同与规则核验','articles':calculate()}
    path=Path(__file__).with_suffix('.json');path.write_text(json.dumps(result,ensure_ascii=False,indent=2)+'\n',encoding='utf-8')
    print(json.dumps(result,ensure_ascii=False,indent=2))