import { describe, it, expect } from 'vitest'
import { openDb } from '../src/db'
import { seedIfEmpty } from '../src/seed'
import { createClient } from '../src/repos-clients'
import { recordPayment } from '../src/repos-payments'
import {
  createAmc, listAmc, generateAmcRenewalInvoice, amcPaidStatus, getAmc,
} from '../src/repos-amc'

function setup() {
  const db = openDb(':memory:'); seedIfEmpty(db) // seeds company.state_code, GST18, AMC module
  const c = createClient(db, 'u1', { name: 'Acme', stateCode: '32' })
  return { db, c }
}

describe('amc contracts', () => {
  it('creates, generates a renewal invoice, and derives paid from settlement', () => {
    const { db, c } = setup()
    const amc = createAmc(db, 'u1', {
      clientId: c.id, coverage: 'On-site support', periodFrom: '2026-04-01', periodTo: '2027-03-31',
      amountPaise: 20_000_00,
    })
    expect(listAmc(db, c.id)).toHaveLength(1)
    expect(amcPaidStatus(db, getAmc(db, amc.id)!)).toBe('unbilled')
    const inv = generateAmcRenewalInvoice(db, 'u1', amc.id)
    expect(inv.docType).toBe('INVOICE')
    expect(inv.payablePaise).toBe(23_600_00) // 20,000 + 18% GST intra-state
    expect(amcPaidStatus(db, getAmc(db, amc.id)!)).toBe('unpaid')
    recordPayment(db, 'u1', { clientId: c.id, receivedOn: '2026-07-10', mode: 'bank', amountPaise: 23_600_00 })
    expect(amcPaidStatus(db, getAmc(db, amc.id)!)).toBe('paid')
  })
  it('honours the legacy_paid flag for imported contracts without an invoice', () => {
    const { db, c } = setup()
    const amc = createAmc(db, 'u1', {
      clientId: c.id, periodFrom: '2025-04-01', periodTo: '2026-03-31', amountPaise: 10_000_00, legacyPaid: true,
    })
    expect(amcPaidStatus(db, getAmc(db, amc.id)!)).toBe('paid')
  })
})