// apps/hq/test/payments.test.ts
import { describe, it, expect } from 'vitest'
import { openDb } from '../src/db'
import { createClient } from '../src/repos-clients'
import { createModule, setPrice } from '../src/repos-modules'
import { createDraft, issueDocument, getDocument } from '../src/repos-documents'
import { recordPayment, clientLedger, modulePaidView } from '../src/repos-payments'

function invoiceFor(db: any, clientId: string, moduleId: string) {
  return issueDocument(db, 'u1', createDraft(db, 'u1', { docType: 'INVOICE', clientId,
    lines: [{ moduleId, qty: 1, kind: 'yearly' }] }).id)
}

describe('payments', () => {
  it('oldest-first default allocation; part_paid then paid; leftover is an advance', () => {
    const db = openDb(':memory:')
    db.prepare(`INSERT INTO setting (key, value) VALUES ('company.state_code','32')`).run()
    db.prepare(`INSERT INTO tax_class (class_code, rate_pct_bp, effective_from) VALUES ('GST18', 1800, '2017-07-01')`).run()
    const c = createClient(db, 'u1', { name: 'Acme', stateCode: '32' })
    const m = createModule(db, 'u1', { code: 'POS', name: 'POS' })
    setPrice(db, 'u1', { moduleId: m.id, kind: 'yearly', pricePaise: 10_000_00, effectiveFrom: '2026-04-01' })
    const inv1 = invoiceFor(db, c.id, m.id) // ₹11,800
    const inv2 = invoiceFor(db, c.id, m.id) // ₹11,800
    recordPayment(db, 'u1', { clientId: c.id, receivedOn: '2026-07-10', mode: 'bank', amountPaise: 15_000_00 })
    expect(getDocument(db, inv1.id)!.status).toBe('paid')       // 11,800 settled
    expect(getDocument(db, inv2.id)!.status).toBe('part_paid')  // 3,200 of 11,800
    recordPayment(db, 'u1', { clientId: c.id, receivedOn: '2026-07-11', mode: 'upi', amountPaise: 10_000_00 })
    expect(getDocument(db, inv2.id)!.status).toBe('paid')
    expect(clientLedger(db, c.id).advancePaise).toBe(1_400_00)  // 25,000 − 23,600
  })
  it('invoice-minus-TDS settles in full', () => {
    const db = openDb(':memory:')
    db.prepare(`INSERT INTO setting (key, value) VALUES ('company.state_code','32')`).run()
    db.prepare(`INSERT INTO tax_class (class_code, rate_pct_bp, effective_from) VALUES ('GST18', 1800, '2017-07-01')`).run()
    const c = createClient(db, 'u1', { name: 'Acme', stateCode: '32' })
    const m = createModule(db, 'u1', { code: 'POS', name: 'POS' })
    setPrice(db, 'u1', { moduleId: m.id, kind: 'yearly', pricePaise: 10_000_00, effectiveFrom: '2026-04-01' })
    const inv = invoiceFor(db, c.id, m.id) // ₹11,800; client pays minus 10% TDS on ₹10,000
    recordPayment(db, 'u1', { clientId: c.id, receivedOn: '2026-07-10', mode: 'bank',
      amountPaise: 10_800_00, tdsPaise: 1_000_00 })
    expect(getDocument(db, inv.id)!.status).toBe('paid')
    const view = modulePaidView(db, c.id)
    expect(view[0]).toMatchObject({ moduleId: m.id, billedPaise: 11_800_00, settledPaise: 11_800_00 })
  })
})