import { beforeEach, describe, expect, it, vi } from 'vitest'
import type { IPCResult } from '@d3ro/core/errors'
import type { CheckoutSessionResult, SubscriptionStatusResult } from '@d3ro/core/types'
import {
  CheckoutFlowController,
  type CheckoutFlowPorts,
  isTrustedStripeCheckoutUrl
} from '../../src/renderer/components/payment/checkout-flow'

type CreateResult = IPCResult<CheckoutSessionResult>
type StatusResult = IPCResult<SubscriptionStatusResult>

const trustedUrl = 'https://checkout.stripe.com/c/pay/cs_test_renderer_safe#fragment'
const checkoutSuccess: CreateResult = {
  success: true,
  data: { checkoutUrl: trustedUrl, provider: 'stripe', status: 'pending' }
}
const openSuccess: IPCResult<void> = { success: true, data: undefined }
const activeSubscription: StatusResult = {
  success: true,
  data: { tier: 'pro_plus', valid: true, expiresAt: Date.parse('2099-01-01T00:00:00.000Z') }
}
const ipcFailure = {
  success: false as const,
  error: { code: 999, message: 'private provider details' }
}

function deferred<T>(): {
  promise: Promise<T>
  resolve: (value: T) => void
} {
  let resolve!: (value: T) => void
  const promise = new Promise<T>((done) => {
    resolve = done
  })
  return { promise, resolve }
}

describe('renderer checkout flow', () => {
  let createCheckoutSession: ReturnType<typeof vi.fn>
  let openExternal: ReturnType<typeof vi.fn>
  let getSubscriptionStatus: ReturnType<typeof vi.fn>
  let controller: CheckoutFlowController

  beforeEach(() => {
    createCheckoutSession = vi.fn().mockResolvedValue(checkoutSuccess)
    openExternal = vi.fn().mockResolvedValue(openSuccess)
    getSubscriptionStatus = vi.fn().mockResolvedValue(activeSubscription)
    const ports: CheckoutFlowPorts = {
      createCheckoutSession,
      openExternal,
      getSubscriptionStatus
    }
    controller = new CheckoutFlowController(ports)
  })

  it('opens only the authenticated IPC checkout result and waits for server confirmation', async () => {
    const opened = await controller.start('pro')

    expect(opened).toBe(true)
    expect(createCheckoutSession).toHaveBeenCalledWith({ tier: 'pro', provider: 'stripe' })
    expect(openExternal).toHaveBeenCalledWith({ url: trustedUrl })
    expect(getSubscriptionStatus).not.toHaveBeenCalled()
    expect(controller.getState()).toEqual({
      phase: 'awaiting',
      error: null,
      verifiedTier: null
    })
  })

  it('fails closed when checkout IPC returns a provider error', async () => {
    createCheckoutSession.mockResolvedValue(ipcFailure)

    await controller.start('pro')

    expect(controller.getState()).toMatchObject({ phase: 'idle', error: 'checkout-failed' })
    expect(openExternal).not.toHaveBeenCalled()
  })

  it('fails closed when checkout IPC throws a network error', async () => {
    createCheckoutSession.mockRejectedValue(new Error('private network details'))

    await controller.start('pro')

    expect(controller.getState()).toMatchObject({ phase: 'idle', error: 'network-failed' })
    expect(openExternal).not.toHaveBeenCalled()
  })

  it.each([
    {
      checkoutUrl: 'http://checkout.stripe.com/c/pay/cs_test_bad',
      provider: 'stripe',
      status: 'pending'
    },
    { checkoutUrl: 'https://evil.test/c/pay/cs_test_bad', provider: 'stripe', status: 'pending' },
    { checkoutUrl: trustedUrl, provider: 'toss', status: 'pending' },
    { checkoutUrl: trustedUrl, provider: 'stripe', status: 'completed' }
  ])('rejects an unsafe or forged checkout response %#', async (data) => {
    createCheckoutSession.mockResolvedValue({ success: true, data })

    await controller.start('pro')

    expect(controller.getState()).toMatchObject({
      phase: 'idle',
      error: 'unsafe-checkout-response'
    })
    expect(openExternal).not.toHaveBeenCalled()
  })

  it('fails closed when the OS cannot open the checkout page', async () => {
    openExternal.mockResolvedValue(ipcFailure)

    await controller.start('pro')

    expect(controller.getState()).toMatchObject({ phase: 'idle', error: 'open-failed' })
  })

  it('fails closed when opening the checkout page throws', async () => {
    openExternal.mockRejectedValue(new Error('private shell details'))

    await controller.start('pro')

    expect(controller.getState()).toMatchObject({ phase: 'idle', error: 'open-failed' })
  })

  it('coalesces duplicate checkout clicks into one IPC request', async () => {
    const pending = deferred<CreateResult>()
    createCheckoutSession.mockReturnValue(pending.promise)

    const first = controller.start('pro')
    const duplicate = controller.start('pro_plus')

    expect(await duplicate).toBe(false)
    expect(createCheckoutSession).toHaveBeenCalledTimes(1)
    pending.resolve(checkoutSuccess)
    expect(await first).toBe(true)
    expect(openExternal).toHaveBeenCalledTimes(1)
  })

  it('invalidates a pending checkout when the user closes the modal', async () => {
    const pending = deferred<CreateResult>()
    createCheckoutSession.mockReturnValue(pending.promise)

    const start = controller.start('pro')
    controller.cancel()
    pending.resolve(checkoutSuccess)

    expect(await start).toBe(false)
    expect(openExternal).not.toHaveBeenCalled()
    expect(controller.getState()).toEqual({ phase: 'idle', error: null, verifiedTier: null })
  })

  it('does not treat an opened or cancelled provider page as payment success', async () => {
    await controller.start('pro')
    getSubscriptionStatus.mockResolvedValue({
      success: true,
      data: { tier: 'free', valid: false, expiresAt: null }
    })

    const tier = await controller.verify()

    expect(tier).toBeNull()
    expect(controller.getState()).toMatchObject({ phase: 'awaiting', error: 'not-confirmed' })
  })

  it('fails closed when subscription readback returns an IPC error', async () => {
    await controller.start('pro')
    getSubscriptionStatus.mockResolvedValue(ipcFailure)

    const tier = await controller.verify()

    expect(tier).toBeNull()
    expect(controller.getState()).toMatchObject({
      phase: 'awaiting',
      error: 'verification-failed'
    })
  })

  it('fails closed when subscription readback throws a network error', async () => {
    await controller.start('pro')
    getSubscriptionStatus.mockRejectedValue(new Error('private subscription details'))

    const tier = await controller.verify()

    expect(tier).toBeNull()
    expect(controller.getState()).toMatchObject({ phase: 'awaiting', error: 'network-failed' })
  })

  it('rejects an arbitrary paid tier even when a forged response claims it is valid', async () => {
    await controller.start('pro')
    getSubscriptionStatus.mockResolvedValue({
      success: true,
      data: { tier: 'enterprise', valid: true, expiresAt: null }
    })

    const tier = await controller.verify()

    expect(tier).toBeNull()
    expect(controller.getState()).toMatchObject({
      phase: 'awaiting',
      error: 'invalid-entitlement'
    })
  })

  it('returns and displays only the server-read subscription tier', async () => {
    await controller.start('pro')

    const tier = await controller.verify()

    expect(tier).toBe('pro_plus')
    expect(controller.getState()).toEqual({
      phase: 'complete',
      error: null,
      verifiedTier: 'pro_plus'
    })
  })

  it('coalesces duplicate subscription verification clicks', async () => {
    await controller.start('pro')
    const pending = deferred<StatusResult>()
    getSubscriptionStatus.mockReturnValue(pending.promise)

    const first = controller.verify()
    const duplicate = controller.verify()

    expect(await duplicate).toBeNull()
    expect(getSubscriptionStatus).toHaveBeenCalledTimes(1)
    pending.resolve(activeSubscription)
    expect(await first).toBe('pro_plus')
  })

  it('ignores a successful subscription response after cancellation', async () => {
    await controller.start('pro')
    const pending = deferred<StatusResult>()
    getSubscriptionStatus.mockReturnValue(pending.promise)

    const verification = controller.verify()
    controller.cancel()
    pending.resolve(activeSubscription)

    expect(await verification).toBeNull()
    expect(controller.getState()).toEqual({ phase: 'idle', error: null, verifiedTier: null })
  })

  it('accepts only the trusted Stripe HTTPS checkout origin and path', () => {
    expect(isTrustedStripeCheckoutUrl(trustedUrl)).toBe(true)
    expect(isTrustedStripeCheckoutUrl('https://checkout.stripe.com/portal/cs_test_bad')).toBe(false)
    expect(
      isTrustedStripeCheckoutUrl('https://user:pass@checkout.stripe.com/c/pay/cs_test_bad')
    ).toBe(false)
  })
})