import {
  buildPaypleConfig,
  generateOrderId,
  parsePaypleTimestamp,
  paypleAuth,
  paypleBilling,
  PaypleBillingError,
  payplePaymentEventDigest,
  payplePaymentEventId,
  payplePayerNumber,
  PaypleConfigurationError,
  PaypleVerificationError,
  resolvePaypleOrderDate,
} from './payple.ts'

function assert(condition: boolean, message: string): asserts condition {
  if (!condition) throw new Error(message)
}

const validConfig = {
  PAYPLE_ENVIRONMENT: 'live',
  PAYPLE_CST_ID: 'merchant-id',
  PAYPLE_CUST_KEY: 'merchant-secret',
  PAYPLE_REFUND_KEY: 'refund-secret',
  PAYPLE_CLIENT_KEY: 'client-key',
  PAYPLE_SITE_URL: 'https://d3ro.chanpaca.net/payments',
}

Deno.test('Payple configuration has no implicit demo credential fallback', () => {
  for (const missing of Object.keys(validConfig)) {
    const candidate = { ...validConfig, [missing]: undefined }
    let error: unknown
    try {
      buildPaypleConfig(candidate)
    } catch (caught) {
      error = caught
    }
    assert(error instanceof PaypleConfigurationError, `${missing} must be required`)
  }
})

Deno.test('Payple environment selects only the official fixed API host', () => {
  const live = buildPaypleConfig(validConfig)
  assert(live.baseUrl === 'https://cpay.payple.kr', 'live host')
  assert(live.siteUrl === 'https://d3ro.chanpaca.net', 'referer uses registered origin')
  const test = buildPaypleConfig({ ...validConfig, PAYPLE_ENVIRONMENT: 'test' })
  assert(test.baseUrl === 'https://democpay.payple.kr', 'test host')
})

Deno.test('Payple timestamps are interpreted as Korea standard time', () => {
  const timestamp = parsePaypleTimestamp('20260821153045')
  assert(timestamp.toISOString() === '2026-08-21T06:30:45.000Z', 'KST conversion')
  assert(
    parsePaypleTimestamp('2026-08-21 15:30:45').toISOString() === timestamp.toISOString(),
    'documented formatted timestamp',
  )
  let error: unknown
  try {
    parsePaypleTimestamp('2026-99-99')
  } catch (caught) {
    error = caught
  }
  assert(error instanceof PaypleVerificationError, 'invalid timestamp must fail')
})

Deno.test('Payple order identifiers are unique and carry a reconcilable payment date', () => {
  const first = generateOrderId('11111111-2222-4333-8444-555555555555', 'aaaaaaaa-bbbb-4ccc-8ddd-eeeeeeeeeeee')
  const second = generateOrderId('11111111-2222-4333-8444-555555555555', 'ffffffff-bbbb-4ccc-8ddd-eeeeeeeeeeee')
  assert(first !== second, 'nonce must prevent same-second collision')
  assert(/^[A-Za-z0-9._-]{8,64}$/.test(first), 'Payple order syntax')
  assert(resolvePaypleOrderDate(first) === first.slice(5, 13), 'order date is recoverable')
  assert(resolvePaypleOrderDate('legacy-order', '20260821153045') === '20260821', 'legacy fallback date')
  assert(
    resolvePaypleOrderDate('D3RO-20260820153045-test-nonce', '20260821003045') === '20260821',
    'authoritative Payple time wins across the Korea/UTC date boundary',
  )
})

Deno.test('Payple payer number is deterministic, numeric and user-specific', async () => {
  const first = await payplePayerNumber('11111111-2222-4333-8444-555555555555')
  const same = await payplePayerNumber('11111111-2222-4333-8444-555555555555')
  const other = await payplePayerNumber('aaaaaaaa-bbbb-4ccc-8ddd-eeeeeeeeeeee')
  assert(/^\d{18}$/.test(first), 'payer number must satisfy Payple 18-digit contract')
  assert(first === same, 'same user must map consistently')
  assert(first !== other, 'different users must not share the fixture mapping')
})

Deno.test('Payple synchronous charge and webhook share one provider event identity', async () => {
  const identity = {
    orderId: 'D3RO-20260821153045-test-nonce',
    payerId: 'payer-fixture',
    payType: 'card' as const,
    amount: 9900,
  }
  const directDigest = await payplePaymentEventDigest(identity)
  const webhookDigest = await payplePaymentEventDigest({ ...identity })
  const differentCharge = await payplePaymentEventDigest({ ...identity, amount: 29900 })
  assert(payplePaymentEventId(identity.orderId) === `payment:${identity.orderId}`, 'canonical event id')
  assert(directDigest === webhookDigest, 'same external charge must be an exact replay')
  assert(directDigest !== differentCharge, 'different charge identity must not collide')
})

Deno.test('Payple auth response cannot redirect server calls to another origin', async () => {
  const originalFetch = globalThis.fetch
  globalThis.fetch = () => Promise.resolve(new Response(JSON.stringify({
    result: 'success',
    cst_id: 'encrypted-id',
    custKey: 'encrypted-key',
    AuthKey: 'auth-key',
    PCD_PAY_HOST: 'https://cpay.payple.kr.evil.example',
    PCD_PAY_URL: '/php/PayChkAct.php',
  }), { status: 200, headers: { 'Content-Type': 'application/json' } }))
  let error: unknown
  try {
    await paypleAuth(buildPaypleConfig(validConfig), { payCheckFlag: true })
  } catch (caught) {
    error = caught
  } finally {
    globalThis.fetch = originalFetch
  }
  assert(
    error instanceof PaypleVerificationError
      && error.code === 'payple_untrusted_api_host',
    'untrusted Payple response host must fail closed',
  )
})

Deno.test('Payple billing separates definitive declines from ambiguous transport outcomes', async () => {
  const config = buildPaypleConfig(validConfig)
  const auth = {
    PCD_CST_ID: 'encrypted-id',
    PCD_CUST_KEY: 'encrypted-key',
    PCD_AUTH_KEY: 'auth-key',
    PCD_PAY_HOST: 'https://cpay.payple.kr',
    PCD_PAY_URL: '',
  }
  const originalFetch = globalThis.fetch
  const cases: Array<{
    fetcher: typeof fetch
    definitive: boolean
  }> = [
    {
      fetcher: () => Promise.reject(new TypeError('connection reset')),
      definitive: false,
    },
    {
      fetcher: () => Promise.resolve(new Response('upstream unavailable', { status: 503 })),
      definitive: false,
    },
    {
      fetcher: () => Promise.resolve(new Response(JSON.stringify({
        PCD_PAY_RST: 'error',
        PCD_PAY_CODE: 'BILL0001',
        PCD_PAY_MSG: 'declined',
      }), { status: 200, headers: { 'Content-Type': 'application/json' } })),
      definitive: true,
    },
  ]
  try {
    for (const testCase of cases) {
      globalThis.fetch = testCase.fetcher
      let error: unknown
      try {
        await paypleBilling(config, auth, {
          payerId: 'payer-fixture',
          amount: 9900,
          orderId: 'D3RO-20260821153045-test-nonce',
          goodsName: 'D3RO Voice Pro',
        })
      } catch (caught) {
        error = caught
      }
      assert(error instanceof PaypleBillingError, 'billing failure must be typed')
      assert(error.definitive === testCase.definitive, 'billing certainty classification')
    }
  } finally {
    globalThis.fetch = originalFetch
  }
})