// 投入口径 reporting 推导函数测试（Leader 第二轮返工后追加任务 A3）。
// 断言锚点 = 生产现网 run 26e9c9ab-2fad-4a7d-8190-2a7134a11f76 的真实账目：
//   累计投入 12029.09 / 最终持仓估值 10846.00 / 投入回报率 -9.84%。
// 口径：投入 = 首日 cash − 末日 cash；估值 = Σ 末日 positions × closes；
// 回报 = 估值 / 投入 − 1。不含初始账户闲置现金。
import { describe, expect, it } from 'vitest';
import { capitalReporting, fmtInvestmentPct } from './capitalMetrics';

// 忠实于现网该 run 的首末两行（中间行与本口径无关）。
const fixture = {
  equity: [
    { date: '2025-09-18', equity: 100000.0, cash: 100000.0, closes: { '159399': 1.127 }, positions: { '159399': 0 } },
    { date: '2026-09-17', equity: 98816.91045543, cash: 87970.91045543001, closes: { '159399': 0.986 }, positions: { '159399': 11000 } }
  ]
} as const;

describe('capitalReporting（现网 run 26e9c9ab 真实账目锚点）', () => {
  it('累计投入 = 首日 cash − 末日 cash，保留 2 位', () => {
    const c = capitalReporting(fixture as never);
    expect(c.invested).toBeCloseTo(12029.09, 2);
  });

  it('最终持仓估值 = Σ 末日 positions × closes（10846.00）', () => {
    const c = capitalReporting(fixture as never);
    expect(c.holdingValue).toBeCloseTo(10846.0, 2);
  });

  it('投入回报率 = 估值 / 投入 − 1，带正负号与百分号（-9.84%）', () => {
    const c = capitalReporting(fixture as never);
    expect(c.returnPct).toBe('-9.84%');
  });

  it('多持仓键：多个 symbol 的市值求和', () => {
    const multi = {
      equity: [
        { date: 'd0', equity: 50000, cash: 50000 },
        { date: 'd1', equity: 50600, cash: 30000, closes: { A: 10.0, B: 2.0 }, positions: { A: 2000, B: 300 } }
      ]
    } as never;
    const c = capitalReporting(multi);
    expect(c.invested).toBeCloseTo(20000, 2);
    expect(c.holdingValue).toBeCloseTo(20000 + 600, 2);
    expect(c.returnPct).toBe('+3.00%');
  });

  it('无投入（未建仓）时回报为 null，不除零', () => {
    const flat = { equity: [{ date: 'd0', equity: 100000, cash: 100000 }] } as never;
    const c = capitalReporting(flat);
    expect(c.invested).toBeCloseTo(0, 2);
    expect(c.holdingValue).toBeCloseTo(0, 2);
    expect(c.returnPct).toBeNull();
  });

  it('空 equity 返回全 null，UI 可渲染占位', () => {
    const c = capitalReporting({ equity: [] } as never);
    expect(c.invested).toBeNull();
    expect(c.holdingValue).toBeNull();
    expect(c.returnPct).toBeNull();
  });
});

describe('fmtInvestmentPct（正负号与百分号）', () => {
  it('负值带负号', () => {
    expect(fmtInvestmentPct(-0.098435)).toBe('-9.84%');
  });
  it('正值带加号', () => {
    expect(fmtInvestmentPct(0.03)).toBe('+3.00%');
  });
  it('四舍五入两位', () => {
    expect(fmtInvestmentPct(0.045849)).toBe('+4.58%');
  });
});