import { afterEach, describe, expect, it } from 'vitest'
import { openPushDatabase } from './push-database.js'
import { DurablePushStore, DELIVERY_LEASE_MS } from './durable-push-store.js'
import {
  cleanupDurablePushFixtures,
  durablePushTestDatabaseUrl,
  fixture,
  notification
} from './durable-push-store.test-fixture.js'

afterEach(cleanupDurablePushFixtures)

describe('durable push acceptance', () => {
  it('counts a logical event once across phones and separates the 300/15min dismissal budget', async () => {
    const { store, advance } = await fixture()
    for (let i = 0; i < 300; i++) {
      expect(await store.accept('host', 'phone1', notification(i))).toBe('queued')
      expect(await store.accept('host', 'phone2', notification(i))).toBe('queued')
      expect(await store.accept('host', 'phone1', notification(i, 'dismiss'))).toBe('queued')
    }
    expect(await store.accept('host', 'phone1', notification(300))).toBe('rate_limited')
    expect(await store.accept('host', 'phone1', notification(300, 'dismiss'))).toBe('rate_limited')
    expect(await store.accept('another-host', 'phone3', notification(300))).toBe('queued')
    advance(15 * 60_000)
    expect(await store.accept('host', 'phone1', notification(301))).toBe('queued')
  })

  it('queues one delivery per event and recovers work across service instances', async () => {
    const { db, store, clock, advance } = await fixture()
    await store.accept('host', 'phone', notification(1))
    const restarted = new DurablePushStore(db, clock)
    await restarted.accept('host', 'phone', notification(1))
    advance(1)
    await restarted.accept('host', 'phone', notification(2))
    const rows = await db.query(
      "SELECT payload_json, due_at, created_at FROM push_delivery_batches WHERE registration_id = ? AND state = 'pending' ORDER BY created_at, batch_id",
      ['phone']
    )
    expect(rows).toHaveLength(2)
    expect(rows.map((row) => JSON.parse(String(row.payload_json)))).toEqual([
      notification(1),
      notification(2)
    ])
    expect(rows.every((row) => Number(row.due_at) >= Number(row.created_at))).toBe(true)
    const delivery = await restarted.claim()
    expect(delivery?.notification.notificationSeq).toBe(1)
    expect(await store.claim()).toBeNull()
    advance(DELIVERY_LEASE_MS)
    const reclaimed = await store.claim()
    expect(reclaimed?.id).toBe(delivery?.id)
    expect(reclaimed?.lease).not.toBe(delivery?.lease)
    await restarted.finish(delivery!)
    expect(await store.claim()).toBeNull()
    await store.finish(reclaimed!)
    const second = await restarted.claim()
    expect(second?.notification.notificationSeq).toBe(2)
    await restarted.finish(second!)
    expect(await restarted.claim()).toBeNull()
  })

  it('never extends expiry and refuses conflicting duplicate content', async () => {
    const { store, advance } = await fixture()
    await store.accept('host', 'phone', notification(1))
    expect(await store.accept('host', 'phone', { ...notification(1), body: 'changed' })).toBe(
      'error'
    )
    const delivery = (await store.claim())!
    await store.finish(delivery, 10 * 60_000)
    advance(60_000)
    expect(await store.claim()).toBeNull()
    advance(5 * 60_000)
    expect(await store.accept('host', 'phone', notification(1))).toBe('error')
  })

  it('orders a due retry before a fresh first attempt without delaying the retry', async () => {
    const { store, advance } = await fixture()
    await store.accept('host', 'phone', notification(1))
    const first = (await store.claim())!
    await store.finish(first, 1000)
    expect(await store.claim()).toBeNull()

    advance(1000)
    await store.accept('host', 'phone', notification(2))
    const retry = (await store.claim())!
    expect(retry.notification.notificationSeq).toBe(1)
    await store.finish(retry)
    const fresh = (await store.claim())!
    expect(fresh?.notification.notificationSeq).toBe(2)
    await store.finish(fresh!)
  })

  it('orders an expired first-attempt lease by creation time after a retry becomes due', async () => {
    const { db, store, clock, advance } = await fixture()
    await store.accept('host', 'phone', notification(1))
    const retry = (await store.claim())!
    await store.finish(retry, 1000)

    advance(2000)
    await db.query(
      `INSERT INTO push_delivery_batches(batch_id, host_fingerprint, registration_id, kind, payload_json, state, due_at, expires_at, lease_until, attempts, created_at)
       VALUES ('crashed-singleton', 'host', 'phone', 'alert', ?, 'pending', ?, ?, 0, 1, ?)`,
      [JSON.stringify(notification(2)), clock() - 1, clock() + 300_000, clock()]
    )
    const reclaimedRetry = (await store.claim())!
    expect(reclaimedRetry.notification.notificationSeq).toBe(1)
    await store.finish(reclaimedRetry)
    const reclaimedCrash = (await store.claim())!
    expect(reclaimedCrash.notification.notificationSeq).toBe(2)
    await store.finish(reclaimedCrash)
  })

  it('rolls quota and payload back together if persistence fails', async () => {
    const { db, store } = await fixture()
    await db.query('ALTER TABLE push_delivery_batches RENAME TO push_delivery_batches_unavailable')
    try {
      const databaseUrl = durablePushTestDatabaseUrl
      if (databaseUrl) {
        const concurrent = await openPushDatabase({ databaseUrl, dataDir: '' })
        try {
          await expect(
            concurrent.query('SELECT COUNT(*) FROM push_delivery_batches')
          ).resolves.toHaveLength(1)
        } finally {
          await concurrent.close()
        }
      }
      await expect(store.accept('host', 'phone', notification(1))).rejects.toThrow()
      expect(await db.query('SELECT * FROM push_events')).toEqual([])
      expect(await db.query('SELECT * FROM push_event_recipients')).toEqual([])
    } finally {
      await db.query(
        'ALTER TABLE push_delivery_batches_unavailable RENAME TO push_delivery_batches'
      )
    }
  })
})

it('serializes concurrent instances at the quota boundary', async () => {
  const { db, store, clock } = await fixture()
  for (let seq = 0; seq < 299; seq++) await store.accept('host', 'phone', notification(seq))
  const second = new DurablePushStore(db, clock)
  const results = await Promise.all(
    Array.from({ length: 6 }, (_, index) =>
      (index % 2 ? store : second).accept('host', 'phone', notification(400 + index))
    )
  )
  expect(results.filter((result) => result === 'queued')).toHaveLength(1)
  expect(results.filter((result) => result === 'rate_limited')).toHaveLength(5)
})

it('cancels unsent alerts and prevents an older replay after dismissal', async () => {
  const { store } = await fixture()
  const alert = notification(1)
  await store.accept('host', 'phone', alert)
  await store.accept('host', 'phone', {
    ...notification(2, 'dismiss'),
    notificationId: alert.notificationId
  })
  const delivery = (await store.claim())!
  expect(delivery.notification.kind).toBe('dismiss')
  await store.finish(delivery)
  expect(await store.claim()).toBeNull()
  await store.accept('host', 'another-phone', alert)
  expect(await store.claim()).toBeNull()
})

it('does not resurrect an in-flight alert after a dismissal and transient provider failure', async () => {
  const { store, advance } = await fixture()
  await store.accept('host', 'phone', notification(1))
  const inFlight = (await store.claim())!
  await store.accept('host', 'phone', {
    ...notification(2, 'dismiss'),
    notificationId: notification(1).notificationId
  })
  await store.finish(inFlight, 1000)
  const dismissal = (await store.claim())!
  expect(dismissal.notification.kind).toBe('dismiss')
  await store.finish(dismissal)
  advance(1000)
  expect(await store.claim()).toBeNull()
  expect(await store.pendingCount('phone')).toBe(0)
})

it.each([false, true])(
  'normalizes default alert kind (explicit first: %s)',
  async (explicitFirst) => {
    const { db, store } = await fixture()
    const { kind: _kind, ...implicit } = notification(1)
    const explicit = { kind: 'alert' as const, ...implicit }
    for (const event of explicitFirst ? [explicit, implicit] : [implicit, explicit]) {
      expect(await store.accept('host', 'phone', event)).toBe('queued')
    }
    expect(await store.pendingCount('phone')).toBe(1)
    expect(await db.query('SELECT event_id FROM push_events')).toHaveLength(1)
    expect(await store.accept('host', 'phone', { ...explicit, body: 'changed' })).toBe('error')
    expect(await store.accept('host', 'phone', { ...implicit, kind: 'dismiss' })).toBe('queued')
    expect(await db.query('SELECT event_id FROM push_events')).toHaveLength(2)
  }
)

it('fences late renew and finish after an expired claim is dismissed', async () => {
  const { db, store, advance } = await fixture()
  const alert = notification(1)
  await store.accept('host', 'phone', alert)
  const stale = (await store.claim())!
  advance(DELIVERY_LEASE_MS)
  await store.accept('host', 'phone', {
    ...notification(2, 'dismiss'),
    notificationId: alert.notificationId
  })
  const read = async () =>
    (
      await db.query(
        'SELECT state, payload_json, lease_until FROM push_delivery_batches WHERE batch_id = ?',
        [stale.id]
      )
    )[0]
  expect(await read()).toBeUndefined()
  await store.renew(stale)
  await store.finish(stale, 1000)
  await store.finish(stale)
  expect(await read()).toBeUndefined()
  const dismissal = (await store.claim())!
  expect(dismissal.notification.kind).toBe('dismiss')
  await store.finish(dismissal)
  await store.accept('host', 'phone', notification(3))
  const fresh = (await store.claim())!
  await store.finish(fresh, 1000)
  advance(1000)
  const retry = (await store.claim())!
  expect(retry.id).toBe(fresh.id)
  await store.finish(retry)
  expect(await store.claim()).toBeNull()
})