import { describe, expect, it } from 'bun:test';
import type { TaxonomyFact } from '@/lib/server/taxonomy/types';
import { deriveTaxonomyMetrics } from '@/lib/server/taxonomy/metrics';

function fact(localName: string, value: number, overrides?: Partial<TaxonomyFact>): TaxonomyFact {
  return {
    conceptKey: `http://fasb.org/us-gaap/2024#${localName}`,
    qname: `us-gaap:${localName}`,
    namespaceUri: 'http://fasb.org/us-gaap/2024',
    localName,
    dataType: null,
    contextId: 'c1',
    unit: 'iso4217:USD',
    decimals: '-6',
    precision: null,
    nil: false,
    value,
    periodStart: '2025-01-01',
    periodEnd: '2025-12-31',
    periodInstant: null,
    dimensions: [],
    isDimensionless: true,
    sourceFile: 'abc_htm.xml',
    ...overrides
  };
}

describe('taxonomy metric derivation', () => {
  it('applies concept priority for canonical metrics and debt component fallback', () => {
    const metrics = deriveTaxonomyMetrics([
      fact('SalesRevenueNet', 500),
      fact('Revenues', 450),
      fact('NetIncomeLoss', 40),
      fact('Assets', 1000),
      fact('CashAndCashEquivalentsAtCarryingValue', 80),
      fact('DebtCurrent', 15),
      fact('LongTermDebtNoncurrent', 35)
    ]);

    expect(metrics).toEqual({
      revenue: 450,
      netIncome: 40,
      totalAssets: 1000,
      cash: 80,
      debt: 50
    });
  });

  it('uses direct debt concept before computed debt fallback when available', () => {
    const metrics = deriveTaxonomyMetrics([
      fact('DebtCurrent', 15),
      fact('LongTermDebtNoncurrent', 35),
      fact('LongTermDebtAndCapitalLeaseObligations', 90)
    ]);

    expect(metrics.debt).toBe(90);
  });
});