import { describe, it, expect } from 'vitest'
import {
  AccountsNotInChartError,
  BookkeepingDatabaseError,
  CannotCorrectNonPostedError,
  CannotReverseNonPostedError,
  CurrencyRevaluationAlreadyExistsError,
  DimensionValidationError,
  EntryAlreadyReversedError,
  EntryDateOutsideFiscalPeriodError,
  FiscalPeriodNotFoundError,
  InvalidMappingResultError,
  JournalEntryNotBalancedError,
  JournalEntryNotFoundError,
  accountsNotInChartResponse,
  bookkeepingErrorResponse,
  isAccountsNotInChartError,
  isBookkeepingError,
} from '../errors'

describe('Typed bookkeeping errors', () => {
  it('AccountsNotInChartError carries sorted, deduped account numbers', () => {
    const err = new AccountsNotInChartError(['2641', '1930', '1930', '1510'])
    expect(err.code).toBe('ACCOUNTS_NOT_IN_CHART')
    expect(err.name).toBe('AccountsNotInChartError')
    expect(err.accountNumbers).toEqual(['1510', '1930', '2641'])
    expect(err).toBeInstanceOf(Error)
  })

  it('AccountsNotInChartError ordering is deterministic across input permutations', () => {
    // The user-facing toast lists which accounts to activate in Kontoplan.
    // If the same set of missing accounts came back in different orders on
    // each call, the user might mistake an identical error for a different
    // one. Lock in: same set → same array, regardless of input order.
    const sets: string[][] = [
      ['5410', '2641'],
      ['2641', '5410'],
      ['5410', '5410', '2641', '2641'],
      ['2641', '2641', '5410'],
    ]
    const outputs = sets.map((s) => new AccountsNotInChartError(s).accountNumbers)
    for (const out of outputs) {
      expect(out).toEqual(['2641', '5410'])
    }
    // And the rendered message stays stable too.
    expect(new AccountsNotInChartError(['5410', '2641']).message).toBe(
      new AccountsNotInChartError(['2641', '5410']).message,
    )
  })

  it('AccountsNotInChartError sorts numerically, not by UTF-16 code units', () => {
    // Default string sort would order ['245', '1930'] as ['1930', '245']
    // because '1' < '2'. That's wrong for accounts: a user looking at the
    // toast and walking down their kontoplan expects numeric order.
    const err = new AccountsNotInChartError(['1930', '245', '5410'])
    expect(err.accountNumbers).toEqual(['245', '1930', '5410'])
  })

  it('AccountsNotInChartError tie-breaks numerically-equal strings deterministically', () => {
    // "0245" and "245" compare as Number-equal but are distinct strings; the
    // comparator must not collapse them by returning 0 unstably. We don't
    // emit zero-padded BAS codes anywhere internally, but the public surface
    // shouldn't be sensitive to that defensive case.
    const err = new AccountsNotInChartError(['245', '0245'])
    expect(err.accountNumbers).toEqual(['0245', '245'])
  })

  it('AccountsNotInChartError preserves order across multiple calls with same data', () => {
    // Same inputs ⇒ identical outputs across separate calls (no hidden
    // randomness, no Set iteration drift, no dependence on call order).
    const calls = Array.from({ length: 5 }, () => new AccountsNotInChartError(['5410', '1930', '2641']).accountNumbers)
    for (let i = 1; i < calls.length; i++) {
      expect(calls[i]).toEqual(calls[0])
    }
  })

  it('JournalEntryNotBalancedError preserves amounts and kind', () => {
    const err = new JournalEntryNotBalancedError(100, 80, 'correction')
    expect(err.code).toBe('JOURNAL_ENTRY_NOT_BALANCED')
    expect(err.totalDebit).toBe(100)
    expect(err.totalCredit).toBe(80)
    expect(err.kind).toBe('correction')
    expect(err.message).toContain('100')
    expect(err.message).toContain('80')
  })

  it('JournalEntryNotBalancedError defaults kind to "draft"', () => {
    const err = new JournalEntryNotBalancedError(100, 80)
    expect(err.kind).toBe('draft')
  })

  it('FiscalPeriodNotFoundError has fixed message', () => {
    const err = new FiscalPeriodNotFoundError()
    expect(err.code).toBe('FISCAL_PERIOD_NOT_FOUND')
    expect(err.message).toBe('Fiscal period not found')
  })

  it('EntryDateOutsideFiscalPeriodError carries period context', () => {
    const err = new EntryDateOutsideFiscalPeriodError('2024-06-15', 'FY 2025', '2025-01-01', '2025-12-31')
    expect(err.code).toBe('ENTRY_DATE_OUTSIDE_FISCAL_PERIOD')
    expect(err.entryDate).toBe('2024-06-15')
    expect(err.periodName).toBe('FY 2025')
    expect(err.periodStart).toBe('2025-01-01')
    expect(err.periodEnd).toBe('2025-12-31')
  })

  it('JournalEntryNotFoundError has fixed message', () => {
    const err = new JournalEntryNotFoundError()
    expect(err.code).toBe('JOURNAL_ENTRY_NOT_FOUND')
    expect(err.message).toBe('Journal entry not found')
  })

  it('CannotReverseNonPostedError carries current status', () => {
    const err = new CannotReverseNonPostedError('draft')
    expect(err.code).toBe('CANNOT_REVERSE_NON_POSTED')
    expect(err.currentStatus).toBe('draft')
  })

  it('CannotCorrectNonPostedError carries current status', () => {
    const err = new CannotCorrectNonPostedError('reversed')
    expect(err.code).toBe('CANNOT_CORRECT_NON_POSTED')
    expect(err.currentStatus).toBe('reversed')
  })

  it('EntryAlreadyReversedError has fixed message', () => {
    const err = new EntryAlreadyReversedError()
    expect(err.code).toBe('ENTRY_ALREADY_REVERSED')
  })

  it('CurrencyRevaluationAlreadyExistsError has fixed message', () => {
    const err = new CurrencyRevaluationAlreadyExistsError()
    expect(err.code).toBe('CURRENCY_REVALUATION_ALREADY_EXISTS')
  })

  it('InvalidMappingResultError carries mapping details', () => {
    const err = new InvalidMappingResultError(null, '3001')
    expect(err.code).toBe('INVALID_MAPPING_RESULT')
    expect(err.debitAccount).toBeNull()
    expect(err.creditAccount).toBe('3001')
  })

  it('BookkeepingDatabaseError carries operation tag and cause', () => {
    const err = new BookkeepingDatabaseError('commit_entry', 'constraint violation')
    expect(err.code).toBe('BOOKKEEPING_DATABASE_ERROR')
    expect(err.operation).toBe('commit_entry')
    expect(err.cause).toBe('constraint violation')
    expect(err.message).toContain('commit_entry')
    expect(err.message).toContain('constraint violation')
  })

  it('BookkeepingDatabaseError handles undefined cause', () => {
    const err = new BookkeepingDatabaseError('commit_entry', undefined)
    expect(err.message).toContain('commit_entry')
    expect(err.message).not.toContain('undefined')
  })

  it('DimensionValidationError carries issues and a Swedish message naming every code', () => {
    const err = new DimensionValidationError([
      { sie_dim_no: '6', code: 'P999', reason: 'unknown_value' },
      { sie_dim_no: '1', code: 'KS-GAMMAL', reason: 'archived_value' },
      { sie_dim_no: '9', code: null, reason: 'unknown_dimension' },
    ])
    expect(err.code).toBe('DIMENSION_VALIDATION_FAILED')
    expect(err.name).toBe('DimensionValidationError')
    expect(err).toBeInstanceOf(Error)
    expect(err.issues).toHaveLength(3)
    expect(err.message).toContain(
      'Okänt kostnadsställe/projekt: "P999" (dimension 6). Skapa värdet i registret först.'
    )
    expect(err.message).toContain(
      '"KS-GAMMAL" är arkiverat: återaktivera värdet för att använda det.'
    )
    expect(err.message).toContain('Okänd dimension 9. Skapa dimensionen i registret först.')
  })
})

describe('isAccountsNotInChartError', () => {
  it('returns true for AccountsNotInChartError', () => {
    expect(isAccountsNotInChartError(new AccountsNotInChartError(['1930']))).toBe(true)
  })

  it('returns false for other errors', () => {
    expect(isAccountsNotInChartError(new Error('plain'))).toBe(false)
    expect(isAccountsNotInChartError(new FiscalPeriodNotFoundError())).toBe(false)
    expect(isAccountsNotInChartError(null)).toBe(false)
    expect(isAccountsNotInChartError(undefined)).toBe(false)
  })
})

describe('isBookkeepingError', () => {
  it('returns true for all typed bookkeeping errors', () => {
    expect(isBookkeepingError(new AccountsNotInChartError(['1930']))).toBe(true)
    expect(isBookkeepingError(new JournalEntryNotBalancedError(100, 80))).toBe(true)
    expect(isBookkeepingError(new FiscalPeriodNotFoundError())).toBe(true)
    expect(isBookkeepingError(new EntryDateOutsideFiscalPeriodError('2024-06-15', 'FY', '2025-01-01', '2025-12-31'))).toBe(true)
    expect(isBookkeepingError(new JournalEntryNotFoundError())).toBe(true)
    expect(isBookkeepingError(new CannotReverseNonPostedError('draft'))).toBe(true)
    expect(isBookkeepingError(new CannotCorrectNonPostedError('draft'))).toBe(true)
    expect(isBookkeepingError(new EntryAlreadyReversedError())).toBe(true)
    expect(isBookkeepingError(new CurrencyRevaluationAlreadyExistsError())).toBe(true)
    expect(isBookkeepingError(new InvalidMappingResultError('1930', '3001'))).toBe(true)
    expect(isBookkeepingError(new BookkeepingDatabaseError('commit_entry', 'x'))).toBe(true)
    expect(
      isBookkeepingError(
        new DimensionValidationError([{ sie_dim_no: '6', code: 'X', reason: 'unknown_value' }])
      )
    ).toBe(true)
  })

  it('returns false for plain Error', () => {
    expect(isBookkeepingError(new Error('plain'))).toBe(false)
    expect(isBookkeepingError(null)).toBe(false)
    expect(isBookkeepingError('string')).toBe(false)
  })
})

describe('accountsNotInChartResponse', () => {
  it('returns 400 with Swedish message and account_numbers', async () => {
    const err = new AccountsNotInChartError(['1930', '2641'])
    const response = accountsNotInChartResponse(err)
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('ACCOUNTS_NOT_IN_CHART')
    expect(body.error.message).toContain('1930')
    expect(body.error.message).toContain('2641')
    expect(body.error.account_numbers).toEqual(['1930', '2641'])
  })
})

describe('bookkeepingErrorResponse', () => {
  it('returns null for plain Error', () => {
    expect(bookkeepingErrorResponse(new Error('plain'))).toBeNull()
    expect(bookkeepingErrorResponse(null)).toBeNull()
    expect(bookkeepingErrorResponse('string')).toBeNull()
  })

  it('returns 400 for AccountsNotInChartError (via accountsNotInChartResponse)', async () => {
    const response = bookkeepingErrorResponse(new AccountsNotInChartError(['1930']))!
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('ACCOUNTS_NOT_IN_CHART')
    expect(body.error.account_numbers).toEqual(['1930'])
  })

  it('returns 400 for JournalEntryNotBalancedError with totalDebit/totalCredit', async () => {
    const response = bookkeepingErrorResponse(new JournalEntryNotBalancedError(100, 80, 'draft'))!
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('JOURNAL_ENTRY_NOT_BALANCED')
    expect(body.error.details).toEqual({ totalDebit: 100, totalCredit: 80, kind: 'draft' })
  })

  it('returns 404 for FiscalPeriodNotFoundError', async () => {
    const response = bookkeepingErrorResponse(new FiscalPeriodNotFoundError())!
    expect(response.status).toBe(404)
    const body = await response.json()
    expect(body.error.code).toBe('FISCAL_PERIOD_NOT_FOUND')
  })

  it('returns 400 for EntryDateOutsideFiscalPeriodError with period details', async () => {
    const response = bookkeepingErrorResponse(
      new EntryDateOutsideFiscalPeriodError('2024-06-15', 'FY 2025', '2025-01-01', '2025-12-31')
    )!
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('ENTRY_DATE_OUTSIDE_FISCAL_PERIOD')
    expect(body.error.details).toEqual({
      entryDate: '2024-06-15',
      periodName: 'FY 2025',
      periodStart: '2025-01-01',
      periodEnd: '2025-12-31',
    })
  })

  it('returns 404 for JournalEntryNotFoundError', async () => {
    const response = bookkeepingErrorResponse(new JournalEntryNotFoundError())!
    expect(response.status).toBe(404)
    const body = await response.json()
    expect(body.error.code).toBe('JOURNAL_ENTRY_NOT_FOUND')
  })

  it('returns 400 for CannotReverseNonPostedError with currentStatus', async () => {
    const response = bookkeepingErrorResponse(new CannotReverseNonPostedError('draft'))!
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('CANNOT_REVERSE_NON_POSTED')
    expect(body.error.details).toEqual({ currentStatus: 'draft' })
  })

  it('returns 400 for CannotCorrectNonPostedError with currentStatus', async () => {
    const response = bookkeepingErrorResponse(new CannotCorrectNonPostedError('reversed'))!
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('CANNOT_CORRECT_NON_POSTED')
    expect(body.error.details).toEqual({ currentStatus: 'reversed' })
  })

  it('returns 409 for EntryAlreadyReversedError (concurrent conflict)', async () => {
    const response = bookkeepingErrorResponse(new EntryAlreadyReversedError())!
    expect(response.status).toBe(409)
    const body = await response.json()
    expect(body.error.code).toBe('ENTRY_ALREADY_REVERSED')
  })

  it('returns 409 for CurrencyRevaluationAlreadyExistsError (duplicate)', async () => {
    const response = bookkeepingErrorResponse(new CurrencyRevaluationAlreadyExistsError())!
    expect(response.status).toBe(409)
    const body = await response.json()
    expect(body.error.code).toBe('CURRENCY_REVALUATION_ALREADY_EXISTS')
  })

  it('returns 400 for InvalidMappingResultError with mapping details', async () => {
    const response = bookkeepingErrorResponse(new InvalidMappingResultError(null, '3001'))!
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('INVALID_MAPPING_RESULT')
    expect(body.error.details).toEqual({ debitAccount: null, creditAccount: '3001' })
  })

  it('returns 400 for DimensionValidationError with issue details and Swedish message', async () => {
    const response = bookkeepingErrorResponse(
      new DimensionValidationError([{ sie_dim_no: '6', code: 'P999', reason: 'unknown_value' }])
    )!
    expect(response.status).toBe(400)
    const body = await response.json()
    expect(body.error.code).toBe('DIMENSION_VALIDATION_FAILED')
    expect(body.error.message).toBe(
      'Okänt kostnadsställe/projekt: "P999" (dimension 6). Skapa värdet i registret först.'
    )
    expect(body.error.details).toEqual({
      issues: [{ sie_dim_no: '6', code: 'P999', reason: 'unknown_value' }],
    })
  })

  it('returns 500 for BookkeepingDatabaseError with operation tag', async () => {
    const response = bookkeepingErrorResponse(
      new BookkeepingDatabaseError('commit_entry', 'constraint violation')
    )!
    expect(response.status).toBe(500)
    const body = await response.json()
    expect(body.error.code).toBe('BOOKKEEPING_DATABASE_ERROR')
    expect(body.error.details).toEqual({ operation: 'commit_entry' })
    expect(body.error.message).toContain('constraint violation')
  })
})