import { describe, it, expect, vi, beforeEach } from 'vitest'

import Member from '../../../server/models/member.js'
import { cancelHelcimSubscription } from '../../../server/utils/helcim.js'
import handler from '../../../server/api/members/cancel-subscription.post.js'
import { createMockEvent } from '../helpers/createMockEvent.js'

vi.mock('../../../server/models/member.js', () => ({
  default: { findByIdAndUpdate: vi.fn() }
}))
vi.mock('../../../server/utils/mongoose.js', () => ({ connectDB: vi.fn() }))
vi.mock('../../../server/utils/auth.js', () => ({ requireAuth: vi.fn() }))
vi.mock('../../../server/utils/helcim.js', () => ({
  cancelHelcimSubscription: vi.fn(),
}))

// Nitro auto-imports — stub as globals
const logActivityMock = vi.fn()
vi.stubGlobal('logActivity', logActivityMock)

function setMember(mockMember) {
  globalThis.requireAuth = vi.fn().mockResolvedValue(mockMember)
}

function buildEvent() {
  return createMockEvent({
    method: 'POST',
    path: '/api/members/cancel-subscription',
    body: {},
  })
}

describe('cancel-subscription endpoint', () => {
  beforeEach(() => {
    vi.clearAllMocks()
  })

  it('happy path: active paid member → cancels Helcim, drops to free tier (status stays active), returns success', async () => {
    const mockMember = {
      _id: 'member-1',
      status: 'active',
      contributionAmount: 15,
      helcimSubscriptionId: 'sub-1',
    }
    setMember(mockMember)
    cancelHelcimSubscription.mockResolvedValue({})
    Member.findByIdAndUpdate.mockResolvedValue({})

    const result = await handler(buildEvent())

    expect(cancelHelcimSubscription).toHaveBeenCalledWith('sub-1')
    expect(Member.findByIdAndUpdate).toHaveBeenCalledWith(
      'member-1',
      expect.objectContaining({
        $set: expect.objectContaining({
          status: 'active',
          contributionAmount: 0,
          helcimSubscriptionId: null,
          paymentMethod: 'none',
        }),
        $unset: expect.objectContaining({ nextBillingDate: 1 }),
      }),
      { runValidators: false }
    )
    // Per Fix #9: lastCancelledAt must be set as a Date
    const updateArg = Member.findByIdAndUpdate.mock.calls[0][1]
    expect(updateArg.$set.lastCancelledAt).toBeInstanceOf(Date)
    expect(result).toEqual(expect.objectContaining({
      success: true,
      message: 'Subscription cancelled successfully',
      status: 'active',
      contributionAmount: 0,
    }))
  })

  it('persists subscriptionEndDate as a Date instance', async () => {
    setMember({
      _id: 'member-2',
      status: 'active',
      contributionAmount: 5,
      helcimSubscriptionId: 'sub-2',
    })
    cancelHelcimSubscription.mockResolvedValue({})
    Member.findByIdAndUpdate.mockResolvedValue({})

    await handler(buildEvent())

    const call = Member.findByIdAndUpdate.mock.calls[0]
    expect(call[1].$set.subscriptionEndDate).toBeInstanceOf(Date)
  })

  it('emits subscription_cancelled activity log entry', async () => {
    setMember({
      _id: 'member-3',
      status: 'active',
      contributionAmount: 15,
      helcimSubscriptionId: 'sub-3',
    })
    cancelHelcimSubscription.mockResolvedValue({})
    Member.findByIdAndUpdate.mockResolvedValue({})

    await handler(buildEvent())

    expect(logActivityMock).toHaveBeenCalledWith(
      'member-3',
      'subscription_cancelled',
      expect.objectContaining({ effectiveDate: expect.any(String) })
    )
  })

  it('free-tier member (contributionAmount=0): no Helcim call, no DB write, returns no-op success', async () => {
    const mockMember = {
      _id: 'member-4',
      status: 'active',
      contributionAmount: 0,
      helcimSubscriptionId: null,
    }
    setMember(mockMember)

    const result = await handler(buildEvent())

    expect(cancelHelcimSubscription).not.toHaveBeenCalled()
    expect(Member.findByIdAndUpdate).not.toHaveBeenCalled()
    expect(logActivityMock).not.toHaveBeenCalled()
    expect(result).toEqual({
      success: true,
      message: 'No active subscription to cancel',
      status: 'active',
      contributionAmount: 0,
    })
  })

  it('member without helcimSubscriptionId (data inconsistency): no Helcim call, no DB write', async () => {
    setMember({
      _id: 'member-5',
      status: 'active',
      contributionAmount: 15,
      helcimSubscriptionId: null,
    })

    const result = await handler(buildEvent())

    expect(cancelHelcimSubscription).not.toHaveBeenCalled()
    expect(Member.findByIdAndUpdate).not.toHaveBeenCalled()
    expect(result.success).toBe(true)
    expect(result.message).toBe('No active subscription to cancel')
  })

  it('Helcim cancel failure: swallows error, still updates Member to free tier (status stays active)', async () => {
    setMember({
      _id: 'member-6',
      status: 'active',
      contributionAmount: 15,
      helcimSubscriptionId: 'sub-6',
    })
    cancelHelcimSubscription.mockRejectedValue(new Error('Helcim 503'))
    Member.findByIdAndUpdate.mockResolvedValue({})

    const result = await handler(buildEvent())

    expect(cancelHelcimSubscription).toHaveBeenCalledWith('sub-6')
    expect(Member.findByIdAndUpdate).toHaveBeenCalledWith(
      'member-6',
      expect.objectContaining({
        $set: expect.objectContaining({ status: 'active', helcimSubscriptionId: null }),
      }),
      { runValidators: false }
    )
    expect(result.success).toBe(true)
    expect(result.status).toBe('active')
  })

  it('unauthenticated: requireAuth throws → handler rejects with that statusCode', async () => {
    globalThis.requireAuth = vi.fn().mockRejectedValue(
      Object.assign(new Error('Unauthorized'), { statusCode: 401 })
    )

    await expect(handler(buildEvent())).rejects.toMatchObject({
      statusCode: 401,
    })

    expect(cancelHelcimSubscription).not.toHaveBeenCalled()
    expect(Member.findByIdAndUpdate).not.toHaveBeenCalled()
  })

  it('Mongo update failure: rejects with 500', async () => {
    setMember({
      _id: 'member-7',
      status: 'active',
      contributionAmount: 15,
      helcimSubscriptionId: 'sub-7',
    })
    cancelHelcimSubscription.mockResolvedValue({})
    Member.findByIdAndUpdate.mockRejectedValue(new Error('Mongo down'))

    await expect(handler(buildEvent())).rejects.toMatchObject({
      statusCode: 500,
      statusMessage: 'Mongo down',
    })
  })
})