import { and, eq } from 'drizzle-orm'
import {
  afterAll,
  afterEach,
  beforeAll,
  beforeEach,
  describe,
  expect,
  it,
} from 'vitest'

import * as schema from '#/db/schema.ts'
import * as ordering from '#/domain/ordering.ts'
import { createFakePaymentProvider } from '#/lib/payment.ts'
import { seedGhostKitchen } from '#/db/seed.ts'

import { startTestDatabase } from './helpers/test-db.ts'
import type { TestDatabase } from './helpers/test-db.ts'

let testDb: TestDatabase
let seed: Awaited<ReturnType<typeof seedGhostKitchen>>
let payment: ReturnType<typeof createFakePaymentProvider>

beforeAll(async () => {
  testDb = await startTestDatabase()
  seed = await seedGhostKitchen(testDb.db)
}, 120_000)

afterAll(async () => {
  await testDb.stop()
})

beforeEach(() => {
  payment = createFakePaymentProvider()
})

// Every Order/OrderItem/Step is scoped to a single test — each test places
// its own Order(s) — so the Machines seeded once in beforeAll stay idle
// between tests instead of leaking a busy state into the next one.
afterEach(async () => {
  await testDb.db.delete(schema.preparationStepInstances)
  await testDb.db.delete(schema.orderItemSteps)
  await testDb.db.delete(schema.orderItems)
  await testDb.db.delete(schema.orders)
})

const placeGuestOrder = (items: Array<{ menuItemId: number }>) =>
  ordering.placeOrder(testDb.db, payment, {
    items,
    customer: { type: 'guest', name: 'Ada', contact: 'ada@example.com' },
  })

// Tests act as the guest who placed the order, so they present its access
// token exactly like a real caller would — this exercises the same
// ownership check a stranger guessing the order id would fail.
const accessFor = (order: { guestAccessToken: string | null }) => ({
  guestAccessToken: order.guestAccessToken ?? undefined,
})

const getStatus = (order: { id: number; guestAccessToken: string | null }) =>
  ordering.getOrderStatus(testDb.db, order.id, accessFor(order))

describe('menu', () => {
  it('lists menu items for a brand with their recipe steps', async () => {
    const menu = await ordering.getMenu(testDb.db, seed.brand.id)

    const pizza = menu.find((item) => item.name === 'Pizza')
    expect(pizza?.steps).toEqual([
      { sequence: 1, machineTag: 'oven', estimatedDurationSeconds: 600 },
    ])

    const burger = menu.find((item) => item.name === 'Burger')
    expect(burger?.steps).toEqual([
      { sequence: 1, machineTag: 'grill', estimatedDurationSeconds: 240 },
      { sequence: 2, machineTag: 'assembly', estimatedDurationSeconds: 90 },
    ])
  })
})

describe('placing an order', () => {
  it('rejects an order with no items', async () => {
    await expect(placeGuestOrder([])).rejects.toThrow()
  })

  it('charges the total price and queues the first Preparation Step for each Order Item', async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
      { menuItemId: seed.menuItems.burger.id },
    ])

    expect(order.status).toBe('paid')
    expect(order.paymentChargeId).toBeTruthy()

    const status = await getStatus(order)
    expect(status.items).toHaveLength(2)

    const pizzaItem = status.items.find(
      (item) => item.menuItemName === 'Pizza',
    )!
    // Only one oven, but the pizza is the only thing waiting for it, so it
    // starts immediately.
    expect(pizzaItem.steps[0].status).toBe('in_progress')
    expect(pizzaItem.cancellable).toBe(false)

    const burgerItem = status.items.find(
      (item) => item.menuItemName === 'Burger',
    )!
    expect(burgerItem.steps[0].status).toBe('in_progress')
    expect(burgerItem.steps[1].status).toBe('pending')
  })

  it('does not let a second Order Item jump the queue ahead of one already assigned to the only Machine of that Tag', async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])
    const secondOrder = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])

    const firstStatus = await getStatus(order)
    const secondStatus = await getStatus(secondOrder)

    expect(firstStatus.items[0].steps[0].status).toBe('in_progress')
    expect(secondStatus.items[0].steps[0].status).toBe('queued')
    expect(secondStatus.items[0].steps[0].queuePosition).toBe(1)
    expect(secondStatus.items[0].cancellable).toBe(true)
  })

  it('refunds the charge if the DB transaction fails after payment has already gone through', async () => {
    let capturedChargeId: string | undefined
    const spyingPayment: typeof payment = {
      ...payment,
      charge: async (amountCents) => {
        const charge = await payment.charge(amountCents)
        capturedChargeId = charge.chargeId
        return charge
      },
    }

    // Pre-charge validation still runs against the real DB (so it passes
    // normally); only the transaction itself is forced to fail, simulating
    // an unexpected DB error after the customer has already been charged.
    const dbWithFailingTransaction = Object.create(
      testDb.db,
    ) as typeof testDb.db
    dbWithFailingTransaction.transaction = () => {
      throw new Error('simulated DB failure after payment')
    }

    await expect(
      ordering.placeOrder(dbWithFailingTransaction, spyingPayment, {
        items: [{ menuItemId: seed.menuItems.pizza.id }],
        customer: { type: 'guest', name: 'Ada', contact: 'ada@example.com' },
      }),
    ).rejects.toThrow('simulated DB failure after payment')

    expect(capturedChargeId).toBeTruthy()
    expect(payment.refundsFor(capturedChargeId!)).toBe(
      seed.menuItems.pizza.priceCents,
    )
  })
})

describe('cancelling an Order Item', () => {
  it('cancels and refunds an item that has not started cooking yet, without touching its sibling', async () => {
    await placeGuestOrder([{ menuItemId: seed.menuItems.pizza.id }]) // occupies the only oven
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
      { menuItemId: seed.menuItems.burger.id },
    ])

    const before = await getStatus(order)
    const pizzaItem = before.items.find(
      (item) => item.menuItemName === 'Pizza',
    )!
    const burgerItem = before.items.find(
      (item) => item.menuItemName === 'Burger',
    )!
    expect(pizzaItem.status).toBe('paid') // still queued, oven is busy
    expect(burgerItem.steps[0].status).toBe('in_progress') // grill was free

    await ordering.cancelOrderItem(
      testDb.db,
      payment,
      pizzaItem.id,
      accessFor(order),
    )

    expect(payment.refundsFor(order.paymentChargeId!)).toBe(
      seed.menuItems.pizza.priceCents,
    )

    const after = await getStatus(order)
    const cancelledPizza = after.items.find(
      (item) => item.menuItemName === 'Pizza',
    )!
    const untouchedBurger = after.items.find(
      (item) => item.menuItemName === 'Burger',
    )!
    expect(cancelledPizza.status).toBe('cancelled')
    expect(untouchedBurger.steps[0].status).toBe('in_progress')
  })

  it('completes the order once its only item is cancelled', async () => {
    await placeGuestOrder([{ menuItemId: seed.menuItems.pizza.id }]) // occupies the only oven
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])

    await ordering.cancelOrderItem(
      testDb.db,
      payment,
      (await getStatus(order)).items[0].id,
      accessFor(order),
    )

    const after = await getStatus(order)
    expect(after.status).toBe('complete')
  })

  it('refuses to cancel an item that has already started cooking, with a message reflecting that', async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])
    const status = await getStatus(order)
    const pizzaItem = status.items[0]
    expect(pizzaItem.steps[0].status).toBe('in_progress')

    await expect(
      ordering.cancelOrderItem(
        testDb.db,
        payment,
        pizzaItem.id,
        accessFor(order),
      ),
    ).rejects.toThrow(/already started cooking/)
  })

  it('rejects a cancellation with the wrong access token', async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.burger.id },
    ])
    const status = await getStatus(order)

    await expect(
      ordering.cancelOrderItem(testDb.db, payment, status.items[0].id, {
        guestAccessToken: 'not-the-real-token',
      }),
    ).rejects.toThrow(ordering.ForbiddenError)
  })

  it('gives an accurate message for a double-cancel', async () => {
    await placeGuestOrder([{ menuItemId: seed.menuItems.burger.id }]) // occupies the only grill
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.burger.id },
    ])
    const itemId = (await getStatus(order)).items[0].id

    await ordering.cancelOrderItem(testDb.db, payment, itemId, accessFor(order))

    await expect(
      ordering.cancelOrderItem(testDb.db, payment, itemId, accessFor(order)),
    ).rejects.toThrow(/already been cancelled/)
  })
})

describe('advancing steps and pickup', () => {
  it('moves a multi-step item through each step, freeing the machine, and completes the order once every item is picked up independently', async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.burger.id },
    ])
    let status = await getStatus(order)
    const burgerItemId = status.items[0].id

    expect(status.items[0].steps[0].status).toBe('in_progress')

    await ordering.advanceOrderItemStep(testDb.db, burgerItemId)

    status = await getStatus(order)
    expect(status.items[0].steps[0].status).toBe('done')
    expect(status.items[0].steps[1].status).toBe('in_progress')
    expect(status.items[0].status).toBe('paid')

    await ordering.advanceOrderItemStep(testDb.db, burgerItemId)

    status = await getStatus(order)
    expect(status.items[0].steps[1].status).toBe('done')
    expect(status.items[0].status).toBe('ready')

    await ordering.markOrderItemPickedUp(
      testDb.db,
      burgerItemId,
      accessFor(order),
    )

    status = await getStatus(order)
    expect(status.items[0].status).toBe('picked_up')
    expect(status.status).toBe('complete')
  })

  it('assigns a freed machine to the next queued step for the same Tag', async () => {
    const firstOrder = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])
    const secondOrder = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])

    let firstStatus = await getStatus(firstOrder)
    const firstItemId = firstStatus.items[0].id

    let secondStatus = await getStatus(secondOrder)
    expect(secondStatus.items[0].steps[0].status).toBe('queued')

    await ordering.advanceOrderItemStep(testDb.db, firstItemId)

    firstStatus = await getStatus(firstOrder)
    expect(firstStatus.items[0].status).toBe('ready')

    secondStatus = await getStatus(secondOrder)
    expect(secondStatus.items[0].steps[0].status).toBe('in_progress')
  })

  it('refuses to mark an item picked up before it is ready', async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])
    const status = await getStatus(order)

    await expect(
      ordering.markOrderItemPickedUp(
        testDb.db,
        status.items[0].id,
        accessFor(order),
      ),
    ).rejects.toThrow(ordering.OrderItemNotReadyError)
  })
})

describe('recipe snapshot', () => {
  it("keeps an Order Item on the Recipe as it existed at order time, even if the Menu Item's live Recipe is edited afterwards", async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.burger.id },
    ])

    const burgerSecondStepEdit = and(
      eq(schema.menuItemSteps.menuItemId, seed.menuItems.burger.id),
      eq(schema.menuItemSteps.sequence, 2),
    )
    // Edit the live Recipe after the Order was placed: swap the burger's
    // second Step to a different Machine Tag and duration.
    await testDb.db
      .update(schema.menuItemSteps)
      .set({
        machineTagId: seed.machineTags.oven.id,
        estimatedDurationSeconds: 999,
      })
      .where(burgerSecondStepEdit)

    try {
      const beforeAdvance = await getStatus(order)
      const burgerItemId = beforeAdvance.items[0].id
      const pendingStep = beforeAdvance.items[0].steps[1]
      expect(pendingStep.status).toBe('pending')
      expect(pendingStep.machineTag).toBe('assembly')
      expect(pendingStep.estimatedDurationSeconds).toBe(90)

      await ordering.advanceOrderItemStep(testDb.db, burgerItemId)

      const afterAdvance = await getStatus(order)
      const secondStep = afterAdvance.items[0].steps[1]
      expect(secondStep.status).toBe('in_progress')
      expect(secondStep.machineTag).toBe('assembly')
      expect(secondStep.estimatedDurationSeconds).toBe(90)
    } finally {
      await testDb.db
        .update(schema.menuItemSteps)
        .set({
          machineTagId: seed.machineTags.assembly.id,
          estimatedDurationSeconds: 90,
        })
        .where(burgerSecondStepEdit)
    }
  })
})

describe('access control', () => {
  it('refuses to show order status to someone without the access token', async () => {
    const order = await placeGuestOrder([
      { menuItemId: seed.menuItems.pizza.id },
    ])

    await expect(
      ordering.getOrderStatus(testDb.db, order.id, {}),
    ).rejects.toThrow(ordering.ForbiddenError)
  })
})