/**
 * _proof_short_income.js — 红测试原型（纯 Node 可跑，无需 jest 依赖）
 * ============================================================================
 * 目的：证明"income 页 MarkClosePnl 缺 longRatio"是一个真实存在、但当前测试未覆盖的不一致。
 *
 * 公式逐字抄录自团队金标准 YLErpDAL/Helpers/FrontendCalcReference.cs：
 *   CalcUnwind (unwindSwapTrade.js)  : 含 longRatio
 *   CalcIncome (incomeSwapTrade.js)  : 无 longRatio   ← 差异点
 *
 * 跑法：node YLErpWeb/fe-tests/_proof_short_income.js
 */
'use strict';

// ---- unwind 页公式（对应 FrontendCalcReference.CalcUnwind:42-47，含 longRatio）----
function calcUnwindMarkClosePnl(input) {
    const scale = input.multiplier === 100 ? 0.01 : 1;
    const floatRatio = input.payDirection === 1 ? 1 : -1;
    const longRatio = input.positionType === 1 ? 1 : -1;
    const v = input.closeQty * (input.tradingAmountAvg * scale - input.posiGrossPrice) * floatRatio * longRatio * 10000;
    const rounded = Math.round(v) / 10000;
    return Math.round(rounded * 100) / 100; // toFixed(2)
}

// ---- income 页公式（对应 FrontendCalcReference.CalcIncome:105-108，无 longRatio）----
function calcIncomeMarkClosePnl(input) {
    const scale = input.multiplier === 100 ? 0.01 : 1;
    const floatRatio = input.payDirection === 1 ? 1 : -1;
    // 注意：此处按照当前生产代码，没有乘以 longRatio
    const v = input.positionQty * input.contractSize * (input.tradingAmountAvg * scale - input.posiGrossPrice) * floatRatio;
    return Math.round(v * 100) / 100;
}

// ---- 修复后 income 公式（补上 longRatio，与 unwind / 后端一致）----
function calcIncomeMarkClosePnlFixed(input) {
    const scale = input.multiplier === 100 ? 0.01 : 1;
    const floatRatio = input.payDirection === 1 ? 1 : -1;
    const longRatio = input.positionType === 1 ? 1 : -1;
    const v = input.positionQty * input.contractSize * (input.tradingAmountAvg * scale - input.posiGrossPrice) * floatRatio * longRatio;
    return Math.round(v * 100) / 100;
}

// 同一笔债券 TRS：期初全价 1.02，期末（互换/平仓价）105(×100形态→1.05)，价差 0.03
const base = { multiplier: 100, posiGrossPrice: 1.02, tradingAmountAvg: 105, contractSize: 1 };
const longCase = { ...base, closeQty: 10000, positionQty: 10000, payDirection: 1, positionType: 1 };
const shortCase = { ...base, closeQty: 10000, positionQty: 10000, payDirection: 1, positionType: 2 };

function check(name, cond) {
    console.log(`  [${cond ? 'PASS' : 'FAIL'}] ${name}`);
    return cond;
}

console.log('=== 场景A：多头（PositionType=1）—— 两页理应一致 ===');
const aU = calcUnwindMarkClosePnl(longCase);
const aI = calcIncomeMarkClosePnl(longCase);
console.log(`  unwind=${aU}  income=${aI}`);
let allPass = true;
allPass &= check('多头：unwind == income', aU === aI);

console.log('=== 场景B：空头（PositionType=2）—— 当前代码两页符号相反（红）===');
const bU = calcUnwindMarkClosePnl(shortCase);
const bI = calcIncomeMarkClosePnl(shortCase);
console.log(`  unwind=${bU}  income=${bI}  (空头价格涨应亏损，unwind 正确为负，income 错为正)`);
allPass &= check('空头：unwind == income （当前代码会 FAIL → 证明 bug 存在）', bU === bI);

console.log('=== 场景C：空头 + 修复后 income（补 longRatio）—— 应一致（绿）===');
const bIf = calcIncomeMarkClosePnlFixed(shortCase);
console.log(`  unwind=${bU}  incomeFixed=${bIf}`);
allPass &= check('空头：unwind == incomeFixed （修复后 PASS → 证明改动可修复）', bU === bIf);

console.log('');
if (allPass) {
    console.log('✅ 全部通过（若场景B也PASS，说明已修复或无空头场景）');
} else {
    console.log('❌ 场景B 失败 = 当前代码在「空头+income」下两页算出相反符号 → 真实不一致，且现有 FC_001~009 全为多头未覆盖。');
}