import { eq } from 'drizzle-orm'
import { afterAll, beforeAll, describe, expect, it } from 'vitest'
import { claimForCharge } from './claim-for-charge.js'
import { createOrder } from './create-order.js'
import { isOrderNotChargeableError } from './errors.js'
import { startPg } from './pg-harness.js'
import { order } from './schema.js'
import type { TransactionalDatabase } from '@platform-modules/db'
import type { OrdersSchema } from './schema.js'
import type { NewOrder } from './types.js'

const VARIANT_A = '11111111-1111-4111-8111-111111111111'
const BUYER_ID = '33333333-3333-4333-8333-333333333333'

function sleep(ms: number): Promise<void> {
  return new Promise((resolve) => setTimeout(resolve, ms))
}

function baseOrder(): NewOrder {
  return {
    idempotencyKey: crypto.randomUUID(),
    buyerRef: { userId: BUYER_ID },
    currency: 'USD',
    priceMode: 'exclusive',
    subtotal: 1000n,
    tax: 100n,
    discount: 0n,
    total: 1100n,
    lines: [
      {
        variantId: VARIANT_A,
        kind: 'physical',
        qty: 2,
        unitPrice: 500n,
        lineTotal: 1000n,
        currency: 'USD',
        vendorId: null,
      },
    ],
    splits: [{ vendorId: null, amount: 1100n, funder: 'platform' }],
  }
}

describe('claimForCharge concurrency (real Postgres)', () => {
  let db: TransactionalDatabase<OrdersSchema>
  let stop: (() => Promise<void>) | undefined

  beforeAll(async () => {
    const pg = await startPg()
    db = pg.db
    stop = pg.stop
  }, 120_000)

  afterAll(async () => {
    await stop?.()
  }, 30_000)

  it('deterministic interleave: one winner, loser → OrderNotChargeableError, status charging', async () => {
    const created = await db.transaction((tx) => createOrder(tx, baseOrder()))
    const orderId = created.id

    let resolveHold!: () => void
    const hold = new Promise<void>((resolve) => {
      resolveHold = resolve
    })

    const txA = db.transaction(async (txA) => {
      await claimForCharge(txA, orderId)
      await hold
    })

    const txB = db.transaction(async (txB) => {
      await claimForCharge(txB, orderId)
    })

    await sleep(400)
    resolveHold()

    const results = await Promise.allSettled([txA, txB])
    const fulfilled = results.filter((r) => r.status === 'fulfilled')
    const rejected = results.filter((r) => r.status === 'rejected')

    expect(fulfilled).toHaveLength(1)
    expect(rejected).toHaveLength(1)
    expect(isOrderNotChargeableError((rejected[0] as PromiseRejectedResult).reason)).toBe(true)

    const [row] = await db.select().from(order).where(eq(order.id, orderId))
    expect(row?.status).toBe('charging')
  })
})