import { beforeEach, describe, expect, it, vi } from 'vitest'
import { createQueuedMockSupabase } from '@/tests/helpers'
import {
  cancelSchedulesForSource,
  createAccrualSchedule,
  dissolveScheduleNow,
  postDueInstallments,
} from '@/lib/bookkeeping/accruals/service'
import {
  createJournalEntry,
  findFiscalPeriod,
  reverseEntry,
} from '@/lib/bookkeeping/engine'
import {
  CannotReverseNonPostedError,
  EntryAlreadyReversedError,
} from '@/lib/bookkeeping/errors'
import {
  ACCRUAL_NOTHING_TO_DISSOLVE,
  ACCRUAL_SCHEDULE_NOT_ACTIVE,
  ACCRUAL_SCHEDULE_NOT_FOUND,
} from '@/lib/bookkeeping/accruals/errors'
import type { SupabaseClient } from '@supabase/supabase-js'

vi.mock('@/lib/bookkeeping/engine', () => ({
  createJournalEntry: vi.fn(),
  findFiscalPeriod: vi.fn(),
  reverseEntry: vi.fn(),
}))

const mockCreateJournalEntry = vi.mocked(createJournalEntry)
const mockFindFiscalPeriod = vi.mocked(findFiscalPeriod)
const mockReverseEntry = vi.mocked(reverseEntry)

const COMPANY = 'company-1'
const USER = 'user-1'

function makeSchedule(overrides: Record<string, unknown> = {}) {
  return {
    id: 'sched-1',
    user_id: USER,
    company_id: COMPANY,
    direction: 'expense',
    supplier_invoice_id: 'si-1',
    supplier_invoice_item_id: 'sii-1',
    invoice_id: null,
    invoice_item_id: null,
    balance_account: '1730',
    target_account: '6310',
    total_amount: 12000,
    period_start: '2026-01-01',
    period_end: '2026-12-31',
    months: 12,
    origin_journal_entry_id: 'je-origin',
    posting_floor_date: '2026-01-15',
    status: 'active',
    description: 'Försäkring 2026',
    created_at: '2026-01-15T00:00:00Z',
    updated_at: '2026-01-15T00:00:00Z',
    ...overrides,
  }
}

function makeInstallment(overrides: Record<string, unknown> = {}) {
  return {
    id: 'inst-1',
    user_id: USER,
    company_id: COMPANY,
    schedule_id: 'sched-1',
    period_month: '2026-01-01',
    amount: 1000,
    status: 'pending',
    journal_entry_id: null,
    posted_at: null,
    last_error: null,
    created_at: '2026-01-15T00:00:00Z',
    updated_at: '2026-01-15T00:00:00Z',
    schedule: makeSchedule(),
    ...overrides,
  }
}

beforeEach(() => {
  vi.clearAllMocks()
  mockFindFiscalPeriod.mockResolvedValue('fp-1')
  mockCreateJournalEntry.mockResolvedValue({ id: 'je-new' } as never)
  mockReverseEntry.mockResolvedValue({ id: 'je-storno' } as never)
})

describe('postDueInstallments', () => {
  it('posts a due expense installment with Dr target / Cr balance', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment()] }, // due installments
      { data: { bookkeeping_locked_through: null } }, // company_settings
      { data: [{ id: 'inst-1' }] }, // CAS claim
      { count: 0 }, // remaining pending
      { data: null }, // schedule -> completed
    ])

    const result = await postDueInstallments(
      supabase as unknown as SupabaseClient,
      COMPANY,
      { userId: USER, today: '2026-01-20' },
    )

    expect(result).toMatchObject({ posted: 1, failed: 0, skipped: 0 })
    expect(mockCreateJournalEntry).toHaveBeenCalledTimes(1)
    const input = mockCreateJournalEntry.mock.calls[0][3]
    expect(input.source_type).toBe('accrual')
    expect(input.source_id).toBe('sched-1')
    // Floor: period month 2026-01-01 but origin entry dated 2026-01-15.
    expect(input.entry_date).toBe('2026-01-15')
    expect(input.lines).toEqual([
      expect.objectContaining({ account_number: '6310', debit_amount: 1000, credit_amount: 0 }),
      expect.objectContaining({ account_number: '1730', debit_amount: 0, credit_amount: 1000 }),
    ])
  })

  it('flips the lines for revenue schedules (Dr 29xx / Cr 3xxx)', async () => {
    const revenueSchedule = makeSchedule({
      id: 'sched-2',
      direction: 'revenue',
      supplier_invoice_id: null,
      invoice_id: 'inv-1',
      balance_account: '2970',
      target_account: '3001',
      posting_floor_date: '2026-01-01',
    })
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment({ schedule_id: 'sched-2', schedule: revenueSchedule })] },
      { data: { bookkeeping_locked_through: null } },
      { data: [{ id: 'inst-1' }] },
      { count: 1 }, // still pending months -> schedule stays active
    ])

    await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    const input = mockCreateJournalEntry.mock.calls[0][3]
    expect(input.lines).toEqual([
      expect.objectContaining({ account_number: '2970', debit_amount: 1000, credit_amount: 0 }),
      expect.objectContaining({ account_number: '3001', debit_amount: 0, credit_amount: 1000 }),
    ])
  })

  it('shifts the entry date past the company lock date', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment({ period_month: '2026-02-01' })] },
      { data: { bookkeeping_locked_through: '2026-03-31' } },
      { data: [{ id: 'inst-1' }] },
      { count: 0 },
      { data: null },
    ])

    await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-04-10',
    })

    expect(mockCreateJournalEntry.mock.calls[0][3].entry_date).toBe('2026-04-01')
  })

  it('skips months that have not begun yet', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [] }, // the .lte filter excludes future months server-side
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    expect(result.posted).toBe(0)
    expect(mockCreateJournalEntry).not.toHaveBeenCalled()
  })

  it('reverses its own entry when the CAS claim is lost', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment()] },
      { data: { bookkeeping_locked_through: null } },
      { data: [] }, // CAS claim lost (another runner won)
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    expect(result).toMatchObject({ posted: 0, skipped: 1, failed: 0 })
    expect(mockReverseEntry).toHaveBeenCalledWith(
      expect.anything(),
      COMPANY,
      USER,
      'je-new',
    )
  })

  it('reverses its own entry when the CAS claim UPDATE itself errors', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment()] },
      { data: { bookkeeping_locked_through: null } },
      { data: null, error: { message: 'connection reset' } }, // claim errored
      { data: null }, // last_error update in the catch
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    expect(result).toMatchObject({ posted: 0, skipped: 0, failed: 1 })
    expect(result.errors[0].message).toMatch(/Failed to mark installment posted/)
    // Without the storno the next cron run would double-book the month.
    expect(mockReverseEntry).toHaveBeenCalledWith(
      expect.anything(),
      COMPANY,
      USER,
      'je-new',
    )
  })

  it('records the reversal failure too when storno after claim error fails', async () => {
    mockReverseEntry.mockRejectedValueOnce(new Error('Bokföringen är låst'))
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment()] },
      { data: { bookkeeping_locked_through: null } },
      { data: null, error: { message: 'connection reset' } }, // claim errored
      { data: null }, // last_error update in the catch
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    expect(result.failed).toBe(1)
    expect(result.errors[0].message).toMatch(/misslyckades också/)
    expect(result.errors[0].message).toMatch(/Bokföringen är låst/)
  })

  it('clamps the posting date to the next open fiscal period when the date falls in a closed one', async () => {
    mockFindFiscalPeriod.mockResolvedValueOnce(null) // 2026 period is closed
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment()] },
      { data: { bookkeeping_locked_through: null } },
      { data: { id: 'fp-next', period_start: '2027-01-01' } }, // next open period
      { data: [{ id: 'inst-1' }] }, // CAS claim
      { count: 0 },
      { data: null },
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    expect(result).toMatchObject({ posted: 1, failed: 0 })
    const input = mockCreateJournalEntry.mock.calls[0][3]
    expect(input.entry_date).toBe('2027-01-01')
    expect(input.fiscal_period_id).toBe('fp-next')
  })

  it('records an actionable last_error when no open period exists at or after the date', async () => {
    mockFindFiscalPeriod.mockResolvedValueOnce(null)
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeInstallment()] },
      { data: { bookkeeping_locked_through: null } },
      { data: null }, // no open period after the date either
      { data: null }, // last_error update
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    expect(result).toMatchObject({ posted: 0, failed: 1 })
    expect(result.errors[0].message).toMatch(/eller senare/)
    expect(result.errors[0].message).toMatch(/skapa nästa räkenskapsår/)
    expect(mockCreateJournalEntry).not.toHaveBeenCalled()
  })

  it('records last_error and continues when posting fails', async () => {
    mockCreateJournalEntry.mockRejectedValueOnce(new Error('Bokföringen är låst'))
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      {
        data: [
          makeInstallment({ id: 'inst-1' }),
          makeInstallment({ id: 'inst-2', period_month: '2026-02-01' }),
        ],
      },
      { data: { bookkeeping_locked_through: null } },
      { data: null }, // last_error update for inst-1
      { data: [{ id: 'inst-2' }] }, // CAS claim for inst-2
      { count: 0 },
      { data: null },
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-02-20',
    })

    expect(result).toMatchObject({ posted: 1, failed: 1 })
    expect(result.errors[0]).toMatchObject({ installmentId: 'inst-1' })
  })

  it('ignores installments whose schedule is not active', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      {
        data: [
          makeInstallment({ schedule: makeSchedule({ status: 'cancelled' }) }),
        ],
      },
    ])

    const result = await postDueInstallments(supabase as unknown as SupabaseClient, COMPANY, {
      userId: USER,
      today: '2026-01-20',
    })

    expect(result.posted).toBe(0)
    expect(mockCreateJournalEntry).not.toHaveBeenCalled()
  })
})

describe('createAccrualSchedule', () => {
  const spec = {
    direction: 'expense' as const,
    supplierInvoiceId: 'si-1',
    supplierInvoiceItemId: 'sii-1',
    balanceAccount: '1730',
    targetAccount: '6310',
    totalAmountSek: 12000,
    periodStart: '2026-01-01',
    periodEnd: '2026-12-31',
    description: 'Försäkring 2026',
  }

  it('creates the schedule and 12 installments without posting when postCatchUp=false', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: makeSchedule() }, // schedule insert
      { data: null }, // installments insert
    ])

    const schedule = await createAccrualSchedule(
      supabase as unknown as SupabaseClient,
      COMPANY,
      USER,
      spec,
      { originJournalEntryId: 'je-origin', postingFloorDate: '2026-01-15', postCatchUp: false },
    )

    expect(schedule.id).toBe('sched-1')
    expect(mockCreateJournalEntry).not.toHaveBeenCalled()
  })

  it('cleans up the schedule when installment insert fails', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: makeSchedule() },
      { data: null, error: { message: 'boom' } },
      { data: null }, // cleanup delete
    ])

    await expect(
      createAccrualSchedule(
        supabase as unknown as SupabaseClient,
        COMPANY,
        USER,
        spec,
        { postingFloorDate: '2026-01-15', postCatchUp: false },
      ),
    ).rejects.toThrow(/installments/i)
  })
})

describe('dissolveScheduleNow', () => {
  it('posts one combined entry for the remaining months', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: makeSchedule() }, // schedule fetch
      {
        data: [
          makeInstallment({ id: 'inst-11', period_month: '2026-11-01', amount: 1000 }),
          makeInstallment({ id: 'inst-12', period_month: '2026-12-01', amount: 1000 }),
        ],
      },
      { data: { bookkeeping_locked_through: null } },
      { data: [{ id: 'inst-11' }, { id: 'inst-12' }] }, // claim both
      { data: null }, // schedule completed
    ])

    const result = await dissolveScheduleNow(
      supabase as unknown as SupabaseClient,
      COMPANY,
      USER,
      'sched-1',
      { today: '2026-10-15' },
    )

    expect(result).toMatchObject({ journalEntryId: 'je-new', amount: 2000 })
    const input = mockCreateJournalEntry.mock.calls[0][3]
    expect(input.entry_date).toBe('2026-10-15')
    expect(input.lines[0]).toMatchObject({ account_number: '6310', debit_amount: 2000 })
  })

  it('reverses the combined entry when the claim is incomplete', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: makeSchedule() },
      {
        data: [
          makeInstallment({ id: 'inst-11', period_month: '2026-11-01', amount: 1000 }),
          makeInstallment({ id: 'inst-12', period_month: '2026-12-01', amount: 1000 }),
        ],
      },
      { data: { bookkeeping_locked_through: null } },
      { data: [{ id: 'inst-11' }] }, // only one claimed
    ])

    await expect(
      dissolveScheduleNow(supabase as unknown as SupabaseClient, COMPANY, USER, 'sched-1', {
        today: '2026-10-15',
      }),
    ).rejects.toThrow(/ändrades samtidigt/i)
    expect(mockReverseEntry).toHaveBeenCalled()
  })

  it('throws a typed not-found error with a stable code', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([{ data: null, error: { message: 'No rows' } }])

    await expect(
      dissolveScheduleNow(supabase as unknown as SupabaseClient, COMPANY, USER, 'missing'),
    ).rejects.toMatchObject({
      code: ACCRUAL_SCHEDULE_NOT_FOUND,
      message: 'Periodiseringen hittades inte',
    })
  })

  it('throws a typed not-active error with a stable code', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([{ data: makeSchedule({ status: 'completed' }) }])

    await expect(
      dissolveScheduleNow(supabase as unknown as SupabaseClient, COMPANY, USER, 'sched-1'),
    ).rejects.toMatchObject({
      code: ACCRUAL_SCHEDULE_NOT_ACTIVE,
      message: 'Periodiseringen är inte aktiv',
    })
  })

  it('throws a typed nothing-to-dissolve error with a stable code', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: makeSchedule() }, // schedule fetch
      { data: [] }, // nothing pending
      { count: 0 }, // completeScheduleIfDone: remaining pending
      { data: null }, // schedule -> completed
    ])

    await expect(
      dissolveScheduleNow(supabase as unknown as SupabaseClient, COMPANY, USER, 'sched-1'),
    ).rejects.toMatchObject({
      code: ACCRUAL_NOTHING_TO_DISSOLVE,
      message: 'Det finns inget kvar att lösa upp',
    })
  })
})

describe('cancelSchedulesForSource', () => {
  it('cancels pending months, reverses posted ones, and cancels the schedule', async () => {
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeSchedule()] }, // schedules for source
      { data: null }, // pending -> cancelled
      { data: [{ id: 'inst-1', journal_entry_id: 'je-jan' }] }, // posted rows
      { data: null }, // schedule -> cancelled
    ])

    const result = await cancelSchedulesForSource(
      supabase as unknown as SupabaseClient,
      COMPANY,
      USER,
      { supplierInvoiceId: 'si-1' },
      { reversalDate: '2026-05-01' },
    )

    expect(result).toEqual({ cancelledSchedules: 1, reversedEntries: 1, failedReversals: 0 })
    expect(mockReverseEntry).toHaveBeenCalledWith(
      expect.anything(),
      COMPANY,
      USER,
      'je-jan',
      '2026-05-01',
    )
  })

  it('leaves the schedule active and reports the failure when a storno fails', async () => {
    mockReverseEntry.mockRejectedValueOnce(new Error('Bokföringen är låst'))
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeSchedule()] }, // schedules for source
      { data: null }, // pending -> cancelled
      { data: [{ id: 'inst-1', journal_entry_id: 'je-jan' }] }, // posted rows
      { data: null }, // last_error update on the stuck installment
      // NOTE: no schedule -> cancelled update is queued; the schedule must
      // stay 'active' so the UI keeps showing the un-reversed remainder.
    ])

    const result = await cancelSchedulesForSource(
      supabase as unknown as SupabaseClient,
      COMPANY,
      USER,
      { supplierInvoiceId: 'si-1' },
    )

    expect(result).toEqual({ cancelledSchedules: 0, reversedEntries: 0, failedReversals: 1 })
  })

  it('treats already-reversed dissolutions as success and still cancels the schedule', async () => {
    mockReverseEntry
      .mockRejectedValueOnce(new EntryAlreadyReversedError())
      .mockRejectedValueOnce(new CannotReverseNonPostedError('reversed'))
    const { supabase, enqueueMany } = createQueuedMockSupabase()
    enqueueMany([
      { data: [makeSchedule()] },
      { data: null }, // pending -> cancelled
      {
        data: [
          { id: 'inst-1', journal_entry_id: 'je-jan' },
          { id: 'inst-2', journal_entry_id: 'je-feb' },
        ],
      },
      { data: null }, // schedule -> cancelled
    ])

    const result = await cancelSchedulesForSource(
      supabase as unknown as SupabaseClient,
      COMPANY,
      USER,
      { supplierInvoiceId: 'si-1' },
    )

    expect(result).toEqual({ cancelledSchedules: 1, reversedEntries: 0, failedReversals: 0 })
  })

  it('requires a source id', async () => {
    const { supabase } = createQueuedMockSupabase()
    await expect(
      cancelSchedulesForSource(supabase as unknown as SupabaseClient, COMPANY, USER, {}),
    ).rejects.toThrow(/source invoice id/i)
  })
})