import { describe, it, expect, vi, beforeEach } from 'vitest'
import type { SupabaseClient } from '@supabase/supabase-js'

// syncMappedAccounts is exercised by its own suite — here it only needs to be
// observable so allocatePsd2LedgerAccount's chart-ensure call can be asserted.
const { mockSyncMappedAccounts } = vi.hoisted(() => ({
  mockSyncMappedAccounts: vi.fn(),
}))
vi.mock('@/lib/import/account-sync', () => ({
  syncMappedAccounts: (...args: unknown[]) => mockSyncMappedAccounts(...args),
}))

import {
  findFreeLedgerAccount,
  allocatePsd2LedgerAccount,
  resolvePsd2LedgerAccount,
  normalizeIban,
  defaultLedgerForCurrency,
  getRevokedConnectionIds,
  upsertFromPsd2,
  updateBalancesFromSync,
  ensureManualCashAccount,
} from '../service'

type CashRow = {
  ledger_account: string
  bank_connection_id: string | null
  id?: string
  iban?: string | null
}
type ConnRow = { id: string; status: string }

interface MakeSupabaseOpts {
  error?: { message: string } | null
  /** bank_connections rows for the status lookup. Missing ids = not revoked. */
  connections?: ConnRow[]
  connectionsError?: { message: string } | null
  /** 19xx account numbers already present in the company's chart. */
  chart?: string[]
  chartError?: { message: string } | null
}

/**
 * Thenable query stub: PostgREST chains terminate on await, not on a fixed
 * method, so the same object has to answer .eq()/.not()/.like() and still
 * resolve when awaited. Without this a chain that ends in .not() (the IBAN
 * lookup) cannot share a mock with one that ends in .eq().
 */
function chainable(result: { data: unknown; error: unknown }) {
  const chain: Record<string, unknown> = {}
  for (const method of ['select', 'eq', 'neq', 'not', 'is', 'like', 'in', 'order', 'limit']) {
    chain[method] = vi.fn(() => chain)
  }
  chain.then = (onFulfilled: (value: unknown) => unknown) =>
    Promise.resolve(result).then(onFulfilled)
  chain.maybeSingle = vi.fn(() => Promise.resolve(result))
  return chain
}

function makeSupabase(rows: CashRow[], opts: MakeSupabaseOpts = {}) {
  return {
    from: vi.fn((table: string) => {
      if (table === 'bank_connections') {
        return {
          select: vi.fn().mockReturnThis(),
          eq: vi.fn().mockReturnThis(),
          in: vi.fn((_col: string, ids: string[]) =>
            Promise.resolve(
              opts.connectionsError
                ? { data: null, error: opts.connectionsError }
                : {
                    data: (opts.connections ?? []).filter(c => ids.includes(c.id)),
                    error: null,
                  },
            ),
          ),
        }
      }
      if (table === 'chart_of_accounts') {
        return chainable(
          opts.chartError
            ? { data: null, error: opts.chartError }
            : { data: (opts.chart ?? []).map(n => ({ account_number: n })), error: null },
        )
      }
      return chainable({
        data: opts.error ? null : rows,
        error: opts.error ?? null,
      })
    }),
  } as unknown as SupabaseClient
}

beforeEach(() => {
  vi.clearAllMocks()
  mockSyncMappedAccounts.mockResolvedValue({
    created: 1,
    renamed: 0,
    renamedAccounts: [],
    renameFailed: 0,
    error: null,
  })
})

describe('defaultLedgerForCurrency', () => {
  it('maps the four known currencies and falls back to 1930', () => {
    expect(defaultLedgerForCurrency('SEK')).toBe('1930')
    expect(defaultLedgerForCurrency('eur')).toBe('1932')
    expect(defaultLedgerForCurrency('USD')).toBe('1933')
    expect(defaultLedgerForCurrency('GBP')).toBe('1934')
    expect(defaultLedgerForCurrency('NOK')).toBe('1930')
  })
})

describe('getRevokedConnectionIds', () => {
  it('returns only the ids whose connection is revoked', async () => {
    const supabase = makeSupabase([], {
      connections: [
        { id: 'conn-a', status: 'revoked' },
        { id: 'conn-b', status: 'active' },
      ],
    })
    const revoked = await getRevokedConnectionIds(supabase, 'c1', ['conn-a', 'conn-b'])
    expect(revoked).toEqual(new Set(['conn-a']))
  })

  it('returns an empty set without querying when no ids are given', async () => {
    const supabase = makeSupabase([])
    const revoked = await getRevokedConnectionIds(supabase, 'c1', [])
    expect(revoked.size).toBe(0)
    expect((supabase as unknown as { from: ReturnType<typeof vi.fn> }).from).not.toHaveBeenCalled()
  })

  it('treats every connection as active when the lookup fails (conservative)', async () => {
    const supabase = makeSupabase([], { connectionsError: { message: 'boom' } })
    const revoked = await getRevokedConnectionIds(supabase, 'c1', ['conn-a'])
    expect(revoked.size).toBe(0)
  })
})

describe('findFreeLedgerAccount', () => {
  it('returns the currency default when nothing holds it', async () => {
    const supabase = makeSupabase([])
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1930')
    expect(await findFreeLedgerAccount(supabase, 'c1', 'EUR')).toBe('1932')
  })

  it('returns the default when only a MANUAL row holds it (seed promotion)', async () => {
    // The seeded 1930 row has no bank connection — upsertFromPsd2 promotes it
    // in place, so the slot counts as free.
    const supabase = makeSupabase([{ ledger_account: '1930', bank_connection_id: null }])
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1930')
  })

  it('returns the default when it is held only by a REVOKED connection (issue #916)', async () => {
    // Disconnecting a bank releases its ledger claims. Rows orphaned before
    // that fix still point at the revoked connection; they must count as
    // manual holders so a reconnect lands back on 1930, not 1939.
    const supabase = makeSupabase(
      [{ ledger_account: '1930', bank_connection_id: 'conn-revoked' }],
      { connections: [{ id: 'conn-revoked', status: 'revoked' }] },
    )
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1930')
  })

  it('overflows to 1931 when a CONNECTED row holds the default', async () => {
    const supabase = makeSupabase([{ ledger_account: '1930', bank_connection_id: 'conn-1' }], {
      connections: [{ id: 'conn-1', status: 'active' }],
    })
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1931')
  })

  it('still overflows when the revoked-status lookup fails (conservative)', async () => {
    const supabase = makeSupabase(
      [{ ledger_account: '1930', bank_connection_id: 'conn-revoked' }],
      { connectionsError: { message: 'boom' } },
    )
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1931')
  })

  it('keeps revoked-held rows blocking OVERFLOW slots (like manual rows)', async () => {
    // The revoked-held row on 1931 keeps its history on that slot; handing the
    // slot to a different account would steal it via promote-in-place.
    const supabase = makeSupabase(
      [
        { ledger_account: '1930', bank_connection_id: 'conn-active' },
        { ledger_account: '1931', bank_connection_id: 'conn-revoked' },
      ],
      {
        connections: [
          { id: 'conn-active', status: 'active' },
          { id: 'conn-revoked', status: 'revoked' },
        ],
      },
    )
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1935')
  })

  it('never hands out another currency default as an overflow slot', async () => {
    const supabase = makeSupabase([
      { ledger_account: '1930', bank_connection_id: 'conn-1' },
      { ledger_account: '1931', bank_connection_id: 'conn-1' },
    ])
    // 1932/1933/1934 are reserved for EUR/USD/GBP — next free is 1935.
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1935')
  })

  it('does not steal a manual account on an overflow slot', async () => {
    const supabase = makeSupabase([
      { ledger_account: '1930', bank_connection_id: 'conn-1' },
      // Manual (e.g. SIE-imported) account on 1931 — promoting it would
      // silently repoint an unrelated account.
      { ledger_account: '1931', bank_connection_id: null },
    ])
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1935')
  })

  it('honors the exclude set for slots assigned earlier in the caller loop', async () => {
    const supabase = makeSupabase([])
    const exclude = new Set(['1930', '1931'])
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK', exclude)).toBe('1935')
  })

  it('returns null when every slot in 1931–1959 is taken', async () => {
    const rows: CashRow[] = [{ ledger_account: '1930', bank_connection_id: 'conn-1' }]
    for (let n = 1931; n <= 1959; n++) {
      rows.push({ ledger_account: String(n), bank_connection_id: 'conn-1' })
    }
    const supabase = makeSupabase(rows)
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBeNull()
  })

  it('returns null when the lookup fails', async () => {
    const supabase = makeSupabase([], { error: { message: 'boom' } })
    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBeNull()
  })
})

describe('allocatePsd2LedgerAccount', () => {
  it('allocates a slot and ensures it exists in the chart of accounts', async () => {
    const supabase = makeSupabase([{ ledger_account: '1930', bank_connection_id: 'conn-1' }])

    const ledger = await allocatePsd2LedgerAccount(supabase, 'c1', 'u1', {
      currency: 'SEK',
      accountName: 'Sparkonto',
    })

    expect(ledger).toBe('1931')
    expect(mockSyncMappedAccounts).toHaveBeenCalledTimes(1)
    const [, companyId, userId, mappings] = mockSyncMappedAccounts.mock.calls[0]
    expect(companyId).toBe('c1')
    expect(userId).toBe('u1')
    // The chart account gets a BAS-style name, never the bank-reported account
    // name: ASPSPs report the account HOLDER (the company) as the name, and
    // every failed reconnect used to persist another 19xx chart account named
    // after the company (issue #1643 problem 3).
    expect(mappings).toEqual([
      expect.objectContaining({
        sourceAccount: '1931',
        targetAccount: '1931',
        sourceName: 'Bankkonto SEK',
      }),
    ])
  })

  it('uses the BAS reference name when the allocated slot is a standard account', async () => {
    const supabase = makeSupabase([{ ledger_account: '1930', bank_connection_id: 'conn-1' }])
    // Every free-use slot below 1940 is already assigned earlier in the
    // caller's loop, so the allocator lands on 1940 Övriga bankkonton.
    const exclude = new Set(['1931', '1935', '1936', '1937', '1938', '1939'])

    const ledger = await allocatePsd2LedgerAccount(supabase, 'c1', 'u1', {
      currency: 'SEK',
      accountName: 'Arcim AB',
      exclude,
    })

    expect(ledger).toBe('1940')
    const [, , , mappings] = mockSyncMappedAccounts.mock.calls[0]
    expect(mappings).toEqual([
      expect.objectContaining({
        sourceAccount: '1940',
        targetAccount: '1940',
        sourceName: 'Övriga bankkonton',
        targetName: 'Övriga bankkonton',
      }),
    ])
  })

  it('names the chart account after the currency regardless of accountName', async () => {
    const supabase = makeSupabase([])

    await allocatePsd2LedgerAccount(supabase, 'c1', 'u1', { currency: 'EUR' })

    const [, , , mappings] = mockSyncMappedAccounts.mock.calls[0]
    expect(mappings[0].sourceName).toBe('Bankkonto EUR')
  })

  it('returns null when the chart sync fails — a slot that cannot be booked against is useless', async () => {
    mockSyncMappedAccounts.mockResolvedValue({
      created: 0,
      renamed: 0,
      renamedAccounts: [],
      renameFailed: 0,
      error: 'chart unavailable',
    })
    const supabase = makeSupabase([])

    expect(
      await allocatePsd2LedgerAccount(supabase, 'c1', 'u1', { currency: 'SEK' }),
    ).toBeNull()
  })

  it('returns null when no slot is free', async () => {
    const rows: CashRow[] = [{ ledger_account: '1930', bank_connection_id: 'conn-1' }]
    for (let n = 1931; n <= 1959; n++) {
      rows.push({ ledger_account: String(n), bank_connection_id: 'conn-1' })
    }
    const supabase = makeSupabase(rows)

    expect(
      await allocatePsd2LedgerAccount(supabase, 'c1', 'u1', { currency: 'SEK' }),
    ).toBeNull()
    expect(mockSyncMappedAccounts).not.toHaveBeenCalled()
  })
})

describe('findFreeLedgerAccount: chart awareness', () => {
  it('skips an overflow slot that already names a bank account in the chart', async () => {
    // A chart imported from SIE carries the company's real bank accounts
    // ("1931 Nordnet") with no cash_accounts row behind them. Handing one out
    // as free is how a SEK företagskonto got proposed as someone else's
    // brokerage account.
    const supabase = makeSupabase([{ ledger_account: '1930', bank_connection_id: 'conn-1' }], {
      chart: ['1930', '1931', '1935'],
    })

    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1936')
  })

  it('still returns the currency default when the chart holds it', async () => {
    // 1930 exists in every chart; that must not push the SEK account into
    // overflow when no PSD2 row actually claims it.
    const supabase = makeSupabase([], { chart: ['1930'] })

    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1930')
  })

  it('falls back to a chart-occupied slot when nothing unnamed is left', async () => {
    const chart: string[] = []
    for (let n = 1931; n <= 1959; n++) chart.push(String(n))
    const supabase = makeSupabase([{ ledger_account: '1930', bank_connection_id: 'conn-1' }], {
      chart,
    })

    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1931')
  })

  it('allocates normally when the chart lookup fails', async () => {
    const supabase = makeSupabase([{ ledger_account: '1930', bank_connection_id: 'conn-1' }], {
      chartError: { message: 'boom' },
    })

    expect(await findFreeLedgerAccount(supabase, 'c1', 'SEK')).toBe('1931')
  })
})

describe('normalizeIban', () => {
  it('strips formatting so the same account compares equal', () => {
    expect(normalizeIban('SE45 5000 0000 0583 9825 7466')).toBe('SE4550000000058398257466')
    expect(normalizeIban('se4550000000058398257466')).toBe('SE4550000000058398257466')
    expect(normalizeIban(null)).toBeNull()
    expect(normalizeIban('   ')).toBeNull()
  })
})

describe('resolvePsd2LedgerAccount', () => {
  const IBAN = 'SE4550000000058398257466'

  it('reuses the ledger of the row with the same IBAN instead of allocating', async () => {
    // The reconnect case: the bank minted a new account uid (and possibly a
    // whole new connection row), but it is the same physical account.
    const supabase = makeSupabase([
      { id: 'row-1', ledger_account: '1930', bank_connection_id: 'conn-old', iban: IBAN },
    ])

    const resolved = await resolvePsd2LedgerAccount(supabase, 'c1', 'u1', {
      iban: IBAN,
      currency: 'SEK',
    })

    expect(resolved).toEqual({
      ledgerAccount: '1930',
      reuseCashAccountId: 'row-1',
      source: 'iban',
    })
    // No chart write: we are adopting an account that already exists.
    expect(mockSyncMappedAccounts).not.toHaveBeenCalled()
  })

  it('matches on IBAN across formatting differences', async () => {
    const supabase = makeSupabase([
      {
        id: 'row-1',
        ledger_account: '1941',
        bank_connection_id: 'conn-old',
        iban: 'SE45 5000 0000 0583 9825 7466',
      },
    ])

    const resolved = await resolvePsd2LedgerAccount(supabase, 'c1', 'u1', {
      iban: 'se4550000000058398257466',
      currency: 'EUR',
    })

    expect(resolved?.ledgerAccount).toBe('1941')
    expect(resolved?.source).toBe('iban')
  })

  it('reuses even when the previous holder connection is still active', async () => {
    // The bank killed the old session without telling us, so the old row still
    // reads as a live claim. One IBAN is one account: the connection that just
    // authorized owns it.
    const supabase = makeSupabase(
      [{ id: 'row-1', ledger_account: '1930', bank_connection_id: 'conn-old', iban: IBAN }],
      { connections: [{ id: 'conn-old', status: 'active' }] },
    )

    const resolved = await resolvePsd2LedgerAccount(supabase, 'c1', 'u1', {
      iban: IBAN,
      currency: 'SEK',
    })

    expect(resolved?.ledgerAccount).toBe('1930')
    expect(resolved?.reuseCashAccountId).toBe('row-1')
  })

  it('allocates when the IBAN is unknown', async () => {
    const supabase = makeSupabase([
      { id: 'row-1', ledger_account: '1930', bank_connection_id: 'conn-1', iban: 'SE9999' },
    ])

    const resolved = await resolvePsd2LedgerAccount(supabase, 'c1', 'u1', {
      iban: IBAN,
      currency: 'SEK',
    })

    expect(resolved?.source).toBe('allocated')
    expect(resolved?.reuseCashAccountId).toBeNull()
    expect(resolved?.ledgerAccount).toBe('1931')
  })

  it('allocates when the IBAN match was already claimed earlier in the loop', async () => {
    // Two accounts cannot share a ledger: the UNIQUE (company_id,
    // ledger_account) constraint would reject the second write.
    const supabase = makeSupabase([
      { id: 'row-1', ledger_account: '1930', bank_connection_id: null, iban: IBAN },
    ])

    const resolved = await resolvePsd2LedgerAccount(supabase, 'c1', 'u1', {
      iban: IBAN,
      currency: 'SEK',
      exclude: new Set(['1930']),
    })

    expect(resolved?.source).toBe('allocated')
    expect(resolved?.ledgerAccount).not.toBe('1930')
  })

  it('allocates for an account the bank gave no IBAN for', async () => {
    const supabase = makeSupabase([])

    const resolved = await resolvePsd2LedgerAccount(supabase, 'c1', 'u1', {
      iban: null,
      currency: 'SEK',
    })

    expect(resolved).toEqual({
      ledgerAccount: '1930',
      reuseCashAccountId: null,
      source: 'allocated',
    })
  })
})

// ---------------------------------------------------------------------------
// upsertFromPsd2: promote-in-place + duplicate merge (issue #916)
// ---------------------------------------------------------------------------

interface UpsertStub {
  /** Row currently holding (company_id, ledger_account), if any. */
  holder?: { id: string; bank_connection_id: string | null } | null
  /** bank_connections rows for the revoked-status lookup. */
  connections?: ConnRow[]
  /** Existing row for (company_id, bank_connection_id, external_uid) on another ledger. */
  ownRow?: { id: string; is_primary: boolean } | null
  /**
   * Transactions bound to the duplicate ownRow. `booked` rows carry a
   * journal_entry_id (or a confirmed invoice match); `anchor` rows are bound
   * to a verifikat WITHOUT journal_entry_id through the named table (bulk-book
   * N>1 via transaction_voucher_links, multi-allocation via a payment row).
   * The mock mutates this list as rebinds land, so the demote-or-delete probe
   * sees the post-rebind state like the real table would.
   */
  ownTransactions: OwnTx[]
  upsertError?: { message: string } | null
  /** Fail the pre-check SELECT on this anchor table. */
  anchorError?: { table: AnchorTable; message: string } | null
  /** Fail the rebind UPDATE on transactions. */
  rebindError?: { message: string } | null
  // Captured writes:
  updates: Array<{ payload: Record<string, unknown>; id: unknown }>
  deletes: unknown[]
  upserts: Array<Record<string, unknown>>
  rpcCalls: Array<{ fn: string; args: Record<string, unknown> }>
  /** Filters applied to the transactions SELECTs (candidate scan + probe). */
  transactionFilters: Array<{ col: string; value: unknown }>
  /** Rebind UPDATEs from the overflow duplicate onto the promoted row, with their filters. */
  txRebinds: Array<{ payload: Record<string, unknown>; filters: TxFilter[] }>
  /** Anchor tables consulted before the rebind, the ids they were probed with and their eq filters. */
  anchorProbes: Array<{ table: string; ids: string[]; filters: Array<{ col: string; value: unknown }> }>
}

type AnchorTable = 'transaction_voucher_links' | 'invoice_payments' | 'supplier_invoice_payments'
type OwnTx = { id: string; booked?: boolean; anchor?: AnchorTable }
type TxFilter = { op: 'eq' | 'is' | 'in'; col: string; value: unknown }

function makeUpsertStub(partial: Partial<UpsertStub> = {}): UpsertStub {
  return {
    updates: [],
    deletes: [],
    upserts: [],
    rpcCalls: [],
    transactionFilters: [],
    txRebinds: [],
    anchorProbes: [],
    ownTransactions: [],
    ...partial,
  }
}

function makeUpsertSupabase(stub: UpsertStub) {
  return {
    rpc: vi.fn((fn: string, args: Record<string, unknown>) => {
      stub.rpcCalls.push({ fn, args })
      return Promise.resolve({ error: null })
    }),
    from: vi.fn((table: string) => {
      if (table === 'bank_connections') {
        return {
          select: vi.fn().mockReturnThis(),
          eq: vi.fn().mockReturnThis(),
          in: vi.fn((_col: string, ids: string[]) =>
            Promise.resolve({
              data: (stub.connections ?? []).filter(c => ids.includes(c.id)),
              error: null,
            }),
          ),
        }
      }
      if (table === 'transactions') {
        const selectChain = {
          eq: vi.fn((col: string, value: unknown) => {
            stub.transactionFilters.push({ col, value })
            return selectChain
          }),
          is: vi.fn((col: string, value: unknown) => {
            stub.transactionFilters.push({ col, value })
            return selectChain
          }),
          order: vi.fn(() => selectChain),
          // Candidate scan (movable rows): mirrors the .is(null) column gate.
          range: vi.fn((from: number, to: number) =>
            Promise.resolve({
              data: stub.ownTransactions
                .filter((t) => !t.booked)
                .slice(from, to + 1)
                .map((t) => ({ id: t.id })),
              error: null,
            }),
          ),
          // Demote-or-delete probe: anything still bound after the rebind.
          limit: vi.fn(() =>
            Promise.resolve({
              data: stub.ownTransactions.slice(0, 1).map((t) => ({ id: t.id })),
              error: null,
            }),
          ),
        }
        return {
          select: vi.fn(() => selectChain),
          update: vi.fn((payload: Record<string, unknown>) => {
            const rebind = { payload, filters: [] as TxFilter[] }
            stub.txRebinds.push(rebind)
            let ids: string[] = []
            const chain = {
              eq: vi.fn((col: string, value: unknown) => {
                rebind.filters.push({ op: 'eq', col, value })
                return chain
              }),
              is: vi.fn((col: string, value: unknown) => {
                rebind.filters.push({ op: 'is', col, value })
                return chain
              }),
              in: vi.fn((col: string, value: string[]) => {
                rebind.filters.push({ op: 'in', col, value })
                ids = value
                return chain
              }),
              select: vi.fn(() => {
                if (stub.rebindError) {
                  return Promise.resolve({ data: null, error: stub.rebindError })
                }
                const moved = stub.ownTransactions.filter((t) => ids.includes(t.id) && !t.booked)
                stub.ownTransactions = stub.ownTransactions.filter((t) => !moved.includes(t))
                return Promise.resolve({ data: moved.map((t) => ({ id: t.id })), error: null })
              }),
            }
            return chain
          }),
        }
      }
      if (
        table === 'transaction_voucher_links' ||
        table === 'invoice_payments' ||
        table === 'supplier_invoice_payments'
      ) {
        const filters: Array<{ col: string; value: unknown }> = []
        const chain = {
          select: vi.fn(() => chain),
          eq: vi.fn((col: string, value: unknown) => {
            filters.push({ col, value })
            return chain
          }),
          in: vi.fn((_col: string, ids: string[]) => {
            stub.anchorProbes.push({ table, ids, filters })
            if (stub.anchorError && stub.anchorError.table === table) {
              return Promise.resolve({ data: null, error: { message: stub.anchorError.message } })
            }
            const rows = stub.ownTransactions
              .filter((t) => t.anchor === table && ids.includes(t.id))
              .map((t) => ({ transaction_id: t.id }))
            return Promise.resolve({ data: rows, error: null })
          }),
        }
        return chain
      }
      // cash_accounts
      return {
        select: vi.fn((cols: string) => {
          const chain = {
            eq: vi.fn(() => chain),
            neq: vi.fn(() => chain),
            maybeSingle: vi.fn(() => {
              // Holder lookup selects bank_connection_id; duplicate lookup
              // selects is_primary. Route by the requested columns.
              if (cols.includes('bank_connection_id')) {
                return Promise.resolve({ data: stub.holder ?? null, error: null })
              }
              return Promise.resolve({ data: stub.ownRow ?? null, error: null })
            }),
          }
          return chain
        }),
        update: vi.fn((payload: Record<string, unknown>) => ({
          eq: vi.fn((_col: string, id: unknown) => {
            stub.updates.push({ payload, id })
            const result = Promise.resolve({ data: null, error: null })
            return {
              select: vi.fn(() => Promise.resolve({ data: [{ id }], error: null })),
              then: result.then.bind(result),
              catch: result.catch.bind(result),
            }
          }),
        })),
        delete: vi.fn(() => ({
          eq: vi.fn((_col: string, id: unknown) => {
            stub.deletes.push(id)
            return Promise.resolve({ error: null })
          }),
        })),
        upsert: vi.fn((payload: Record<string, unknown>) => {
          stub.upserts.push(payload)
          return Promise.resolve({ error: stub.upsertError ?? null })
        }),
      }
    }),
  } as unknown as SupabaseClient
}

const UPSERT_INPUT = {
  bank_connection_id: 'conn-new',
  external_uid: 'uid-1',
  currency: 'SEK',
  ledger_account: '1930',
}

describe('upsertFromPsd2', () => {
  it('plain-upserts when no row holds the target ledger', async () => {
    const stub = makeUpsertStub({ holder: null })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.upserts).toHaveLength(1)
    expect(stub.upserts[0]).toMatchObject({
      company_id: 'c1',
      bank_connection_id: 'conn-new',
      external_uid: 'uid-1',
      ledger_account: '1930',
    })
    expect(stub.updates).toHaveLength(0)
  })

  it('promotes a MANUAL holder row in place (seed row or demoted-on-disconnect row)', async () => {
    const stub = makeUpsertStub({ holder: { id: 'row-manual', bank_connection_id: null } })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.updates).toHaveLength(1)
    expect(stub.updates[0].id).toBe('row-manual')
    expect(stub.updates[0].payload).toMatchObject({
      bank_connection_id: 'conn-new',
      external_uid: 'uid-1',
      ledger_account: '1930',
    })
    expect(stub.upserts).toHaveLength(0)
  })

  it('promotes a holder owned by a REVOKED connection (orphan self-heal, issue #916)', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    // The orphaned row keeps its id (transaction links survive) and is
    // re-bound to the new connection on its original ledger account.
    expect(stub.updates).toHaveLength(1)
    expect(stub.updates[0].id).toBe('row-old')
    expect(stub.updates[0].payload).toMatchObject({
      bank_connection_id: 'conn-new',
      external_uid: 'uid-1',
      ledger_account: '1930',
    })
    expect(stub.upserts).toHaveLength(0)
    expect(stub.deletes).toHaveLength(0)
  })

  it('does NOT promote a holder owned by an ACTIVE foreign connection', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-other', bank_connection_id: 'conn-other' },
      connections: [{ id: 'conn-other', status: 'active' }],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    // Falls through to the plain upsert; the DB unique constraint is the
    // final arbiter for a genuine conflict.
    expect(stub.updates).toHaveLength(0)
    expect(stub.upserts).toHaveLength(1)
  })

  it('promotes an IBAN-matched holder even when a live connection still holds it', async () => {
    // The reconnect fix: resolvePsd2LedgerAccount matched this row by IBAN, so
    // it is this account under a stale owner. Promoting keeps the row id (and
    // its linked transactions) and re-points it at the new connection; without
    // this the INSERT would trip the (company_id, ledger_account) constraint
    // and the user's 1930 mapping would land on an overflow slot instead.
    const stub = makeUpsertStub({
      holder: { id: 'row-known', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'active' }],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', {
      ...UPSERT_INPUT,
      reuse_cash_account_id: 'row-known',
    })

    expect(stub.upserts).toHaveLength(0)
    expect(stub.updates).toHaveLength(1)
    expect(stub.updates[0].id).toBe('row-known')
    expect(stub.updates[0].payload).toMatchObject({
      bank_connection_id: 'conn-new',
      external_uid: 'uid-1',
      ledger_account: '1930',
    })
  })

  it('ignores a reuse id that does not match the row holding the ledger', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-other', bank_connection_id: 'conn-other' },
      connections: [{ id: 'conn-other', status: 'active' }],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', {
      ...UPSERT_INPUT,
      reuse_cash_account_id: 'row-stale',
    })

    expect(stub.updates).toHaveLength(0)
    expect(stub.upserts).toHaveLength(1)
  })

  it('routes a holder owned by the SAME connection through the plain upsert', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-self', bank_connection_id: 'conn-new' },
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.updates).toHaveLength(0)
    expect(stub.upserts).toHaveLength(1)
  })

  it('promotes a SAME-connection holder under a retired uid when explicitly named via reuse_cash_account_id', async () => {
    // Issue #1709: in-place reconnect of a no-IBAN account whose ASPSP minted
    // a new uid. The callback pairs the account with the connection's own old
    // row and names it explicitly; the promote re-keys that row to the new uid
    // in place, so its id (and the transactions linked to it) survive. Without
    // the explicit name the plain upsert would INSERT and trip the
    // (company_id, ledger_account) UNIQUE constraint; the previous test pins
    // that an UNNAMED same-connection holder still routes through the plain
    // upsert (the general active-holder rejection is not loosened).
    const stub = makeUpsertStub({
      holder: { id: 'row-self', bank_connection_id: 'conn-new' },
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', {
      ...UPSERT_INPUT,
      external_uid: 'uid-2',
      reuse_cash_account_id: 'row-self',
    })

    expect(stub.upserts).toHaveLength(0)
    expect(stub.updates).toHaveLength(1)
    expect(stub.updates[0].id).toBe('row-self')
    expect(stub.updates[0].payload).toMatchObject({
      bank_connection_id: 'conn-new',
      external_uid: 'uid-2',
      ledger_account: '1930',
    })
  })

  it('deletes an empty duplicate row for the same connection+uid before promoting', async () => {
    // Stuck-user recovery: the reconnect callback mirrored uid-1 onto 1939
    // while 1930 was wrongly blocked. On remap to 1930 the empty 1939
    // duplicate is removed and the orphaned holder is promoted, freeing 1939.
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: false },
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.deletes).toEqual(['row-dup'])
    expect(stub.txRebinds).toHaveLength(0)
    expect(stub.updates).toHaveLength(1)
    expect(stub.updates[0].id).toBe('row-old')
    expect(stub.rpcCalls).toHaveLength(0)
  })

  it('rebinds linked transactions then deletes the overflow duplicate', async () => {
    // The reconnect callback mirrored uid-1 onto 1931 and the sync imported
    // rows there; the user then mapped the IBAN to 1930. Unbooked rows follow
    // the promoted ledger so booking proposes 1930, and the emptied 1931
    // mirror is removed.
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: false },
      ownTransactions: [{ id: 'tx-1' }, { id: 'tx-2' }],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.txRebinds).toHaveLength(1)
    expect(stub.txRebinds[0].payload).toEqual({ cash_account_id: 'row-old' })
    // The movable gate (#1570) is re-asserted on the UPDATE itself.
    expect(stub.txRebinds[0].filters).toEqual(
      expect.arrayContaining([
        { op: 'eq', col: 'company_id', value: 'c1' },
        { op: 'eq', col: 'cash_account_id', value: 'row-dup' },
        { op: 'in', col: 'id', value: ['tx-1', 'tx-2'] },
        { op: 'is', col: 'journal_entry_id', value: null },
        { op: 'is', col: 'invoice_id', value: null },
        { op: 'is', col: 'supplier_invoice_id', value: null },
      ]),
    )
    // Junction/payment anchors (no journal_entry_id on the tx) were checked,
    // each scoped by company (the callback path runs with a service-role
    // client, where RLS does not apply).
    expect(stub.anchorProbes.map((p) => p.table).sort()).toEqual([
      'invoice_payments',
      'supplier_invoice_payments',
      'transaction_voucher_links',
    ])
    for (const probe of stub.anchorProbes) {
      expect(probe.filters).toEqual([{ col: 'company_id', value: 'c1' }])
    }
    expect(stub.deletes).toEqual(['row-dup'])
    expect(stub.updates).toHaveLength(1)
    expect(stub.updates[0].id).toBe('row-old')
    expect(stub.updates[0].payload).toMatchObject({ bank_connection_id: 'conn-new' })
  })

  it('demotes (not deletes) the duplicate when booked or voucher-anchored rows remain', async () => {
    // tx-booked has a journal_entry_id and tx-anchored a transaction_voucher_links
    // row: both vouchers carry the old 19xx line, so they stay on the duplicate,
    // which survives as a released manual twin (the #1643 guards handle it).
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: false },
      ownTransactions: [
        { id: 'tx-movable' },
        { id: 'tx-booked', booked: true },
        { id: 'tx-anchored', anchor: 'transaction_voucher_links' },
      ],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    // Only the movable row moved; the anchored one was excluded by the pre-check.
    expect(stub.txRebinds).toHaveLength(1)
    expect(stub.txRebinds[0].filters).toContainEqual({ op: 'in', col: 'id', value: ['tx-movable'] })
    expect(stub.ownTransactions.map((t) => t.id).sort()).toEqual(['tx-anchored', 'tx-booked'])

    expect(stub.deletes).toHaveLength(0)
    expect(stub.updates).toHaveLength(2)
    // First write releases the duplicate's PSD2 binding, preserving the row
    // (and its transactions.cash_account_id links) as a manual account.
    expect(stub.updates[0].id).toBe('row-dup')
    expect(stub.updates[0].payload).toEqual({ bank_connection_id: null, external_uid: null })
    // Second write promotes the holder.
    expect(stub.updates[1].id).toBe('row-old')
    expect(stub.updates[1].payload).toMatchObject({ bank_connection_id: 'conn-new' })
  })

  it('skips the rebind UPDATE when every bound row is booked', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: false },
      ownTransactions: [{ id: 'tx-booked', booked: true }],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.txRebinds).toHaveLength(0)
    expect(stub.anchorProbes).toHaveLength(0)
    expect(stub.deletes).toHaveLength(0)
    expect(stub.updates[0]).toEqual({
      id: 'row-dup',
      payload: { bank_connection_id: null, external_uid: null },
    })
  })

  it.each<AnchorTable>(['invoice_payments', 'supplier_invoice_payments'])(
    'keeps a row anchored through %s on the duplicate and demotes it',
    async (table) => {
      // Multi-allocation (match_batch_allocate) anchors through a payment row
      // with journal_entry_id NULL on the transaction, so the column gate alone
      // would move it. The pre-check must exclude it.
      const stub = makeUpsertStub({
        holder: { id: 'row-old', bank_connection_id: 'conn-old' },
        connections: [{ id: 'conn-old', status: 'revoked' }],
        ownRow: { id: 'row-dup', is_primary: false },
        ownTransactions: [{ id: 'tx-movable' }, { id: 'tx-paid', anchor: table }],
      })
      await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

      expect(stub.txRebinds).toHaveLength(1)
      expect(stub.txRebinds[0].filters).toContainEqual({
        op: 'in',
        col: 'id',
        value: ['tx-movable'],
      })
      expect(stub.ownTransactions.map((t) => t.id)).toEqual(['tx-paid'])
      expect(stub.deletes).toHaveLength(0)
      expect(stub.updates[0]).toEqual({
        id: 'row-dup',
        payload: { bank_connection_id: null, external_uid: null },
      })
      expect(stub.updates[1].id).toBe('row-old')
    },
  )

  it('aborts before any cash_accounts write when an anchor pre-check fails', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: true },
      ownTransactions: [{ id: 'tx-1' }],
      anchorError: { table: 'supplier_invoice_payments', message: 'probe boom' },
    })
    await expect(
      upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT),
    ).rejects.toThrow(/cash_accounts upsert failed: probe boom/)

    expect(stub.txRebinds).toHaveLength(0)
    expect(stub.updates).toHaveLength(0)
    expect(stub.deletes).toHaveLength(0)
    expect(stub.upserts).toHaveLength(0)
    expect(stub.rpcCalls).toHaveLength(0)
  })

  it('aborts before any cash_accounts write when the rebind UPDATE fails', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: true },
      ownTransactions: [{ id: 'tx-1' }],
      rebindError: { message: 'rebind boom' },
    })
    await expect(
      upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT),
    ).rejects.toThrow(/cash_accounts upsert failed: rebind boom/)

    expect(stub.txRebinds).toHaveLength(1)
    expect(stub.ownTransactions.map((t) => t.id)).toEqual(['tx-1'])
    expect(stub.updates).toHaveLength(0)
    expect(stub.deletes).toHaveLength(0)
    expect(stub.upserts).toHaveLength(0)
    expect(stub.rpcCalls).toHaveLength(0)
  })

  it('chunks the anchor probes and the rebind UPDATE at 100 ids', async () => {
    const ids = Array.from({ length: 150 }, (_, i) => `tx-${String(i).padStart(3, '0')}`)
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: false },
      ownTransactions: ids.map((id) => ({ id })),
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    // 3 anchor tables x 2 chunks, each chunk probed against every table.
    expect(stub.anchorProbes).toHaveLength(6)
    for (const table of [
      'transaction_voucher_links',
      'invoice_payments',
      'supplier_invoice_payments',
    ]) {
      const probes = stub.anchorProbes.filter((p) => p.table === table)
      expect(probes.map((p) => p.ids)).toEqual([ids.slice(0, 100), ids.slice(100)])
    }
    const inLists = stub.txRebinds.map(
      (r) => r.filters.find((f) => f.op === 'in' && f.col === 'id')?.value,
    )
    expect(inLists).toEqual([ids.slice(0, 100), ids.slice(100)])
    expect(stub.ownTransactions).toHaveLength(0)
    expect(stub.deletes).toEqual(['row-dup'])
  })

  it('scopes the duplicate linked-transactions probe by company (service-role defense in depth)', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: false },
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.transactionFilters).toEqual(
      expect.arrayContaining([
        { col: 'company_id', value: 'c1' },
        { col: 'cash_account_id', value: 'row-dup' },
      ]),
    )
  })

  it('transfers the primary flag when the deleted duplicate was primary', async () => {
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: true },
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.deletes).toEqual(['row-dup'])
    expect(stub.rpcCalls).toEqual([
      {
        fn: 'set_cash_account_primary',
        args: { p_company_id: 'c1', p_cash_account_id: 'row-old' },
      },
    ])
  })

  it('transfers the primary flag when the DEMOTED duplicate was primary', async () => {
    // Otherwise the stale manual row keeps is_primary=true and the
    // __PRIMARY_SEK__ sentinel resolves to the wrong row.
    const stub = makeUpsertStub({
      holder: { id: 'row-old', bank_connection_id: 'conn-old' },
      connections: [{ id: 'conn-old', status: 'revoked' }],
      ownRow: { id: 'row-dup', is_primary: true },
      ownTransactions: [{ id: 'tx-booked', booked: true }],
    })
    await upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT)

    expect(stub.deletes).toHaveLength(0)
    expect(stub.updates[0].id).toBe('row-dup')
    expect(stub.updates[0].payload).toEqual({ bank_connection_id: null, external_uid: null })
    expect(stub.rpcCalls).toEqual([
      {
        fn: 'set_cash_account_primary',
        args: { p_company_id: 'c1', p_cash_account_id: 'row-old' },
      },
    ])
  })

  it('throws when the plain upsert fails', async () => {
    const stub = makeUpsertStub({ holder: null, upsertError: { message: 'duplicate key' } })
    await expect(
      upsertFromPsd2(makeUpsertSupabase(stub), 'c1', UPSERT_INPUT),
    ).rejects.toThrow(/duplicate key/)
  })
})

// ── ensureManualCashAccount ──────────────────────────────────────────────

interface ManualStub {
  lookup: { data: { id: string; currency?: string } | null; error?: { message: string } | null }
  insert?: { data: { id: string } | null; error?: { message: string; code?: string } | null }
  reread?: { data: { id: string } | null; error?: { message: string } | null }
  inserted: Array<Record<string, unknown>>
  lookupCount: number
}

function makeManualSupabase(stub: ManualStub): SupabaseClient {
  return {
    from: vi.fn((table: string) => {
      expect(table).toBe('cash_accounts')
      return {
        // lookup / reread path: select().eq().eq().maybeSingle()
        select: vi.fn(() => ({
          eq: vi.fn(() => ({
            eq: vi.fn(() => ({
              maybeSingle: vi.fn(() => {
                stub.lookupCount += 1
                // First maybeSingle = initial lookup; a second = post-23505 reread.
                const r = stub.lookupCount === 1 ? stub.lookup : stub.reread ?? { data: null }
                return Promise.resolve({ data: r.data, error: r.error ?? null })
              }),
            })),
          })),
        })),
        // insert().select('id').single()
        insert: vi.fn((payload: Record<string, unknown>) => {
          stub.inserted.push(payload)
          return {
            select: vi.fn(() => ({
              single: vi.fn(() =>
                Promise.resolve({
                  data: stub.insert?.data ?? null,
                  error: stub.insert?.error ?? null,
                }),
              ),
            })),
          }
        }),
      }
    }),
  } as unknown as SupabaseClient
}

describe('ensureManualCashAccount', () => {
  it('returns the existing row id without inserting when the currency matches', async () => {
    const stub: ManualStub = { lookup: { data: { id: 'ca-1', currency: 'SEK' } }, inserted: [], lookupCount: 0 }
    const id = await ensureManualCashAccount(makeManualSupabase(stub), 'c1', '1935', 'sek')
    expect(id).toBe('ca-1')
    expect(stub.inserted).toHaveLength(0)
  })

  it('throws when the existing row is a different currency (UNIQUE ledger conflict)', async () => {
    const stub: ManualStub = { lookup: { data: { id: 'ca-usd', currency: 'USD' } }, inserted: [], lookupCount: 0 }
    await expect(
      ensureManualCashAccount(makeManualSupabase(stub), 'c1', '1935', 'SEK'),
    ).rejects.toThrow(/denominated in USD, not SEK/)
    expect(stub.inserted).toHaveLength(0)
  })

  it('creates a manual row (source=manual, uppercased currency) when none exists', async () => {
    const stub: ManualStub = {
      lookup: { data: null },
      insert: { data: { id: 'ca-new' } },
      inserted: [],
      lookupCount: 0,
    }
    const id = await ensureManualCashAccount(makeManualSupabase(stub), 'c1', '1935', 'sek')
    expect(id).toBe('ca-new')
    expect(stub.inserted[0]).toMatchObject({
      company_id: 'c1',
      ledger_account: '1935',
      currency: 'SEK',
      source: 'manual',
      is_primary: false,
      enabled: true,
    })
  })

  it('re-reads the winner on a 23505 race instead of throwing', async () => {
    const stub: ManualStub = {
      lookup: { data: null },
      insert: { data: null, error: { message: 'duplicate key', code: '23505' } },
      reread: { data: { id: 'ca-winner' } },
      inserted: [],
      lookupCount: 0,
    }
    const id = await ensureManualCashAccount(makeManualSupabase(stub), 'c1', '1935', 'SEK')
    expect(id).toBe('ca-winner')
  })

  it('throws on a non-race insert failure', async () => {
    const stub: ManualStub = {
      lookup: { data: null },
      insert: { data: null, error: { message: 'boom' } },
      inserted: [],
      lookupCount: 0,
    }
    await expect(
      ensureManualCashAccount(makeManualSupabase(stub), 'c1', '1935', 'SEK'),
    ).rejects.toThrow(/boom/)
  })
})

// ---------------------------------------------------------------------------
// updateBalancesFromSync: balance mirror from the PSD2 sync loop
// ---------------------------------------------------------------------------
describe('updateBalancesFromSync', () => {
  interface BalanceUpdate {
    payload: Record<string, unknown>
    filters: Array<[string, unknown]>
  }

  function makeBalanceStub(updateError: { message: string } | null = null) {
    const updates: BalanceUpdate[] = []
    const supabase = {
      from: vi.fn((table: string) => {
        if (table !== 'cash_accounts') throw new Error(`unexpected table ${table}`)
        return {
          update: vi.fn((payload: Record<string, unknown>) => {
            const entry: BalanceUpdate = { payload, filters: [] }
            updates.push(entry)
            const chain = {
              eq: vi.fn((col: string, val: unknown) => {
                entry.filters.push([col, val])
                return chain
              }),
              lt: vi.fn((col: string, val: unknown) => {
                entry.filters.push([`lt:${col}`, val])
                return chain
              }),
              is: vi.fn((col: string, val: unknown) => {
                entry.filters.push([`is:${col}`, val])
                return chain
              }),
              then: (onFulfilled: (value: unknown) => unknown) =>
                Promise.resolve({ error: updateError }).then(onFulfilled),
            }
            return chain
          }),
        }
      }),
    } as unknown as SupabaseClient
    return { supabase, updates }
  }

  it('updates only balance fields, keyed on company + connection + uid', async () => {
    const { supabase, updates } = makeBalanceStub()
    await updateBalancesFromSync(supabase, 'c1', 'conn-1', [
      {
        external_uid: 'uid-1',
        balance: 1000.5,
        available_balance: 950.25,
        balance_updated_at: '2026-09-01T05:00:00.000Z',
      },
    ])

    // Two writes per account: one for rows with an OLDER timestamp, one for
    // rows with NO timestamp. Together they are the stale-writer guard: an
    // older sync run finishing later must not move the mirror backwards.
    expect(updates).toHaveLength(2)
    for (const u of updates) {
      expect(u.payload).toEqual({
        balance: 1000.5,
        available_balance: 950.25,
        balance_updated_at: '2026-09-01T05:00:00.000Z',
      })
    }
    expect(updates[0].filters).toEqual([
      ['company_id', 'c1'],
      ['bank_connection_id', 'conn-1'],
      ['external_uid', 'uid-1'],
      ['lt:balance_updated_at', '2026-09-01T05:00:00.000Z'],
    ])
    expect(updates[1].filters).toEqual([
      ['company_id', 'c1'],
      ['bank_connection_id', 'conn-1'],
      ['external_uid', 'uid-1'],
      ['is:balance_updated_at', null],
    ])
  })

  it('skips accounts without a timestamped balance (never nulls a stored one)', async () => {
    const { supabase, updates } = makeBalanceStub()
    await updateBalancesFromSync(supabase, 'c1', 'conn-1', [
      { external_uid: 'uid-no-balance', balance: null, balance_updated_at: '2026-09-01T05:00:00.000Z' },
      { external_uid: 'uid-no-timestamp', balance: 100 },
      { external_uid: 'uid-ok', balance: 200, balance_updated_at: '2026-09-01T05:00:00.000Z' },
    ])

    expect(updates).toHaveLength(2)
    expect(updates[0].filters).toContainEqual(['external_uid', 'uid-ok'])
    // A refresh without an available type writes null: a stale available
    // figure next to a fresh booked figure would misstate what can be spent.
    expect(updates[0].payload.available_balance).toBeNull()
  })

  it('logs update failures instead of throwing (mirror must not fail the sync)', async () => {
    const { supabase } = makeBalanceStub({ message: 'boom' })
    await expect(
      updateBalancesFromSync(supabase, 'c1', 'conn-1', [
        { external_uid: 'uid-1', balance: 1, balance_updated_at: '2026-09-01T05:00:00.000Z' },
      ]),
    ).resolves.toBeUndefined()
  })
})