import { describe, it, expect, vi, beforeEach } from 'vitest'
import { createQueuedMockSupabase } from '@/tests/helpers'

const linkMock = vi.fn()
const linkGroupMock = vi.fn()
const unlinkMock = vi.fn()
const setIgnoredMock = vi.fn()
const manualLinkMock = vi.fn()
const linkToVouchersMock = vi.fn()
const junctionLinkedMock = vi.fn()
const unlinkReconciliationMock = vi.fn()
const skvStatusMock = vi.fn()
const emitMock = vi.fn()

vi.mock('@/lib/skatteverket/skattekonto-link', async (importOriginal) => {
  const actual = await importOriginal<typeof import('@/lib/skatteverket/skattekonto-link')>()
  return {
    ...actual,
    linkSkattekontoRow: (...args: unknown[]) => linkMock(...args),
    linkSkattekontoRows: (...args: unknown[]) => linkGroupMock(...args),
    unlinkSkattekontoRow: (...args: unknown[]) => unlinkMock(...args),
    setSkattekontoRowIgnored: (...args: unknown[]) => setIgnoredMock(...args),
  }
})
vi.mock('../bank-reconciliation', () => ({
  manualLink: (...args: unknown[]) => manualLinkMock(...args),
  linkTransactionToVouchers: (...args: unknown[]) => linkToVouchersMock(...args),
  fetchJunctionLinkedTxIds: (...args: unknown[]) => junctionLinkedMock(...args),
  unlinkReconciliation: (...args: unknown[]) => unlinkReconciliationMock(...args),
}))
vi.mock('../skattekonto-reconciliation', () => ({
  getSkattekontoReconciliationStatus: (...args: unknown[]) => skvStatusMock(...args),
}))
vi.mock('@/lib/events/bus', () => ({ eventBus: { emit: (...args: unknown[]) => emitMock(...args) } }))

import { SkattekontoLinkError } from '@/lib/skatteverket/skattekonto-link'
import { matchPairs, setItemIgnored, unmatchLink } from '../actions'

const COMPANY = 'company-1'
const USER = 'user-1'
const CASH = '11111111-1111-4111-8111-111111111111'
const R1 = '22222222-2222-4222-8222-222222222222'
const R2 = '33333333-3333-4333-8333-333333333333'
const E1 = '44444444-4444-4444-8444-444444444444'
const E2 = '55555555-5555-4555-8555-555555555555'

describe('matchPairs', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    linkMock.mockReset()
    linkGroupMock.mockReset()
    manualLinkMock.mockReset()
    linkToVouchersMock.mockReset()
    skvStatusMock.mockReset()
    emitMock.mockResolvedValue(undefined)
  })

  it('returns null for an unknown or manual account key', async () => {
    const { supabase } = createQueuedMockSupabase()
    expect(await matchPairs(supabase as never, COMPANY, USER, 'nope', { pairs: [] })).toBeNull()
    expect(await matchPairs(supabase as never, COMPANY, USER, 'manual:1910', { pairs: [] })).toBeNull()
  })

  it('links skattekonto pairs one by one, groups N:1 through the sum-checked helper, and emits one event per row', async () => {
    const { supabase } = createQueuedMockSupabase()
    linkMock
      .mockResolvedValueOnce({ skattekonto_transaction_id: R1, journal_entry_id: E1, via: 'line' })
      .mockRejectedValueOnce(new SkattekontoLinkError('redan kopplat', 'ENTRY_ALREADY_LINKED'))
    linkGroupMock.mockResolvedValueOnce({
      journal_entry_id: E2,
      via: 'entry_total',
      skattekonto_transaction_ids: [R1, R2],
    })

    const result = await matchPairs(supabase as never, COMPANY, USER, 'skattekonto', {
      pairs: [
        { external_ids: [R1], journal_entry_ids: [E1] },
        { external_ids: [R2], journal_entry_ids: [E1] },
        { external_ids: [R1, R2], journal_entry_ids: [E2] },
        // 1:N is a bank-only shape (#1553): a skattekonto row never splits.
        { external_ids: [R1], journal_entry_ids: [E1, E2] },
      ],
    })

    expect(result).toMatchObject({ dry_run: false, considered: 4 })
    expect(result?.applied).toEqual([
      { external_id: R1, journal_entry_id: E1, via: 'line' },
      { external_id: R1, journal_entry_id: E2, via: 'entry_total' },
      { external_id: R2, journal_entry_id: E2, via: 'entry_total' },
    ])
    expect(result?.skipped.map((s) => s.code)).toEqual(['ALREADY_LINKED', 'UNSUPPORTED_PAIR_SHAPE'])
    expect(result?.skipped[1].message).toMatch(/skattekontot/)
    expect(linkToVouchersMock).not.toHaveBeenCalled()
    expect(linkGroupMock).toHaveBeenCalledWith(supabase, COMPANY, [R1, R2], E2)
    expect(emitMock).toHaveBeenCalledTimes(3)
    expect(emitMock.mock.calls[0][0]).toMatchObject({
      type: 'reconciliation.matched',
      payload: { accountKey: 'skattekonto', externalId: R1, journalEntryId: E1, method: 'manual' },
    })
  })

  it('links a bank N:1 group per transaction and reports partial failures per row', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { ledger_account: '1930' } }) // cash_accounts lookup
    manualLinkMock
      .mockResolvedValueOnce({ success: true })
      .mockResolvedValueOnce({ success: false, error: 'Transaktionen är redan kopplad till en verifikation.' })

    const result = await matchPairs(supabase as never, COMPANY, USER, `bank:${CASH}`, {
      pairs: [{ external_ids: [R1, R2], journal_entry_ids: [E1] }],
    })

    expect(result).toMatchObject({ dry_run: false, considered: 1 })
    expect(result?.applied).toEqual([{ external_id: R1, journal_entry_id: E1 }])
    expect(result?.skipped).toEqual([
      {
        pair: { external_ids: [R2], journal_entry_ids: [E1] },
        code: 'PAIR_NOT_CLOSED',
        message: 'Transaktionen är redan kopplad till en verifikation.',
      },
    ])
    expect(emitMock).toHaveBeenCalledTimes(1)
  })

  it('dry run resolves proposals into pairs without writing', async () => {
    const { supabase } = createQueuedMockSupabase()
    skvStatusMock.mockResolvedValue({
      items: {
        proposed: [
          { item_id: R1, proposal: { journal_entry_id: E1, confidence: 0.95 } },
          { item_id: R2, proposal: { journal_entry_id: E2, confidence: 0.8 } },
        ],
      },
    })

    const result = await matchPairs(
      supabase as never,
      COMPANY,
      USER,
      'skattekonto',
      { use_proposals: true, confidence_threshold: 0.9 },
      { dryRun: true },
    )

    expect(result).toMatchObject({ dry_run: true, considered: 1 })
    expect(result?.applied).toEqual([{ external_id: R1, journal_entry_id: E1 }])
    expect(linkMock).not.toHaveBeenCalled()
    expect(emitMock).not.toHaveBeenCalled()
  })

  it('links bank pairs through manualLink with the account ledger number', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { ledger_account: '1931' } }) // cash_accounts lookup
    manualLinkMock.mockResolvedValue({ success: true })

    const result = await matchPairs(supabase as never, COMPANY, USER, `bank:${CASH}`, {
      pairs: [{ external_ids: [R1], journal_entry_ids: [E1] }],
    })

    expect(manualLinkMock).toHaveBeenCalledWith(supabase, COMPANY, R1, E1, USER, '1931')
    expect(result?.applied).toHaveLength(1)
  })

  it('splits ONE bank transaction over SEVERAL verifikat through linkTransactionToVouchers (1:N, #1553)', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { ledger_account: '1930' } }) // cash_accounts lookup, resolved once
    linkToVouchersMock.mockResolvedValue({
      success: true,
      allocations: [
        { journal_entry_id: E1, amount: -500 },
        { journal_entry_id: E2, amount: -300 },
      ],
    })

    const result = await matchPairs(supabase as never, COMPANY, USER, `bank:${CASH}`, {
      pairs: [{ external_ids: [R1], journal_entry_ids: [E1, E2] }],
    })

    // No allocations given: every slice is left undefined for the engine to
    // default to the voucher's bank line and enforce the sum.
    expect(linkToVouchersMock).toHaveBeenCalledWith(
      supabase,
      COMPANY,
      R1,
      [
        { journal_entry_id: E1, amount: undefined },
        { journal_entry_id: E2, amount: undefined },
      ],
      USER,
      '1930',
      { dryRun: false },
    )
    expect(manualLinkMock).not.toHaveBeenCalled()
    expect(result?.applied).toEqual([
      { external_id: R1, journal_entry_id: E1, allocated_amount: -500 },
      { external_id: R1, journal_entry_id: E2, allocated_amount: -300 },
    ])
    expect(result?.skipped).toEqual([])
    expect(emitMock).toHaveBeenCalledTimes(2)
    expect(emitMock.mock.calls[1][0]).toMatchObject({
      type: 'reconciliation.matched',
      payload: { accountKey: `bank:${CASH}`, externalId: R1, journalEntryId: E2 },
    })
  })

  it('forwards explicit allocations, refuses a set that does not name exactly the pair\'s verifikat, and never writes on dry run', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { ledger_account: '1931' } })
    linkToVouchersMock.mockResolvedValue({
      success: true,
      allocations: [
        { journal_entry_id: E1, amount: -450 },
        { journal_entry_id: E2, amount: -350 },
      ],
    })

    const result = await matchPairs(
      supabase as never,
      COMPANY,
      USER,
      `bank:${CASH}`,
      {
        pairs: [
          {
            external_ids: [R1],
            journal_entry_ids: [E1, E2],
            allocations: [
              { journal_entry_id: E1, amount: -450 },
              { journal_entry_id: E2, amount: -350 },
            ],
          },
          // Names a verifikat outside the pair: refused before the engine.
          { external_ids: [R2], journal_entry_ids: [E1, E2], allocations: [{ journal_entry_id: E1, amount: -800 }] },
          // N:M has no engine shape on either account kind.
          { external_ids: [R1, R2], journal_entry_ids: [E1, E2] },
        ],
      },
      { dryRun: true },
    )

    expect(linkToVouchersMock).toHaveBeenCalledTimes(1)
    expect(linkToVouchersMock).toHaveBeenCalledWith(
      supabase,
      COMPANY,
      R1,
      [
        { journal_entry_id: E1, amount: -450 },
        { journal_entry_id: E2, amount: -350 },
      ],
      USER,
      '1931',
      { dryRun: true },
    )
    expect(result?.applied).toHaveLength(2)
    expect(result?.skipped.map((s) => s.code)).toEqual(['UNSUPPORTED_PAIR_SHAPE', 'UNSUPPORTED_PAIR_SHAPE'])
    expect(result?.skipped[0].message).toMatch(/allocations/)
    expect(emitMock).not.toHaveBeenCalled()
  })

  it('a refused split is one PAIR_NOT_CLOSED skip for the whole pair (all or nothing)', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { ledger_account: '1930' } })
    linkToVouchersMock.mockResolvedValue({
      success: false,
      error: 'Fördelningen (-700) stämmer inte med transaktionens belopp (-800).',
    })

    const result = await matchPairs(supabase as never, COMPANY, USER, `bank:${CASH}`, {
      pairs: [{ external_ids: [R1], journal_entry_ids: [E1, E2] }],
    })

    expect(result?.applied).toEqual([])
    expect(result?.skipped).toEqual([
      {
        pair: { external_ids: [R1], journal_entry_ids: [E1, E2] },
        code: 'PAIR_NOT_CLOSED',
        message: 'Fördelningen (-700) stämmer inte med transaktionens belopp (-800).',
      },
    ])
    expect(emitMock).not.toHaveBeenCalled()
  })

  it('a failed bank link is a PAIR_NOT_CLOSED skip, not a throw', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { ledger_account: '1930' } })
    manualLinkMock.mockResolvedValue({ success: false, error: 'Beloppen stämmer inte' })

    const result = await matchPairs(supabase as never, COMPANY, USER, `bank:${CASH}`, {
      pairs: [{ external_ids: [R1], journal_entry_ids: [E1] }],
    })
    expect(result?.skipped[0]).toMatchObject({ code: 'PAIR_NOT_CLOSED', message: 'Beloppen stämmer inte' })
  })
})

describe('unmatchLink / setItemIgnored', () => {
  beforeEach(() => {
    vi.clearAllMocks()
    unlinkMock.mockReset()
    unlinkReconciliationMock.mockReset()
    setIgnoredMock.mockReset()
    junctionLinkedMock.mockReset()
    junctionLinkedMock.mockResolvedValue(new Set<string>())
    emitMock.mockResolvedValue(undefined)
  })

  it('unlinks a skattekonto row and emits reconciliation.unmatched', async () => {
    const { supabase } = createQueuedMockSupabase()
    unlinkMock.mockResolvedValue({ skattekonto_transaction_id: R1, previous_journal_entry_id: E1 })
    const result = await unmatchLink(supabase as never, COMPANY, USER, 'skattekonto', R1)
    expect(result).toEqual({ external_id: R1, previous_journal_entry_id: E1 })
    expect(emitMock.mock.calls[0][0]).toMatchObject({ type: 'reconciliation.unmatched', payload: { externalId: R1 } })
  })

  it('unlinks a bank transaction through the bank engine', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { journal_entry_id: E1 } })
    unlinkReconciliationMock.mockResolvedValue({ success: true })
    const result = await unmatchLink(supabase as never, COMPANY, USER, `bank:${CASH}`, R1)
    expect(unlinkReconciliationMock).toHaveBeenCalledWith(supabase, COMPANY, R1, USER)
    expect(result).toEqual({ external_id: R1, previous_journal_entry_id: E1 })
  })

  it('reports the first junction verifikat as previous_journal_entry_id when a split row (no pointer) is unmatched', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { journal_entry_id: null } })
    unlinkReconciliationMock.mockResolvedValue({ success: true, previousJournalEntryIds: [E1, E2] })
    const result = await unmatchLink(supabase as never, COMPANY, USER, `bank:${CASH}`, R1)
    expect(result).toEqual({ external_id: R1, previous_journal_entry_id: E1 })
    expect(emitMock.mock.calls[0][0]).toMatchObject({
      type: 'reconciliation.unmatched',
      payload: { externalId: R1, previousJournalEntryId: E1 },
    })
  })

  it('refuses to ignore a bank transaction anchored only through transaction_voucher_links (1:N split, bulk-book)', async () => {
    const { supabase, enqueue, findCalls } = createQueuedMockSupabase()
    enqueue({ data: { id: R1, journal_entry_id: null, is_ignored: false } })
    junctionLinkedMock.mockResolvedValue(new Set([R1]))
    await expect(setItemIgnored(supabase as never, COMPANY, `bank:${CASH}`, R1, true)).rejects.toMatchObject({
      code: 'ALREADY_BOOKED',
    })
    expect(junctionLinkedMock).toHaveBeenCalledWith(supabase, COMPANY, [R1])
    expect(findCalls('transactions', 'update')).toEqual([])
  })

  it('ignores a skattekonto row via the core helper', async () => {
    const { supabase } = createQueuedMockSupabase()
    setIgnoredMock.mockResolvedValue({ skattekonto_transaction_id: R1, is_ignored: true })
    expect(await setItemIgnored(supabase as never, COMPANY, 'skattekonto', R1, true)).toEqual({
      external_id: R1,
      is_ignored: true,
    })
  })

  it('refuses to ignore a booked bank transaction', async () => {
    const { supabase, enqueue } = createQueuedMockSupabase()
    enqueue({ data: { id: R1, journal_entry_id: E1, is_ignored: false } })
    await expect(setItemIgnored(supabase as never, COMPANY, `bank:${CASH}`, R1, true)).rejects.toMatchObject({
      code: 'ALREADY_BOOKED',
    })
  })

  it('ignores an unbooked bank transaction', async () => {
    const { supabase, enqueue, findCalls } = createQueuedMockSupabase()
    enqueue({ data: { id: R1, journal_entry_id: null, is_ignored: false } })
    enqueue({ data: null }) // update
    const result = await setItemIgnored(supabase as never, COMPANY, `bank:${CASH}`, R1, true)
    expect(result).toEqual({ external_id: R1, is_ignored: true })
    expect(findCalls('transactions', 'update')[0][0]).toEqual({ is_ignored: true })
  })
})