import { describe, it, expect, beforeEach, vi } from 'vitest'
import { db, getLastSync, setLastSync } from './db.js'

beforeEach(async () => {
  await Promise.all(db.tables.map(t => t.clear()))
  vi.restoreAllMocks()
})

function mockFetch(body = {}, status = 200) {
  globalThis.fetch = vi.fn(() =>
    Promise.resolve({
      ok: status >= 200 && status < 300,
      status,
      statusText: 'OK',
      json: () => Promise.resolve(body),
    })
  )
}

describe('syncPull', () => {
  it('writes attendees to Dexie', async () => {
    mockFetch({
      server_time: '2026-03-01T12:00:00Z',
      attendees: [{ id: 1, name: 'Titania' }],
      departments: [],
      volunteers: [],
      shifts: [],
      volunteer_shifts: [],
    })
    // Import fresh to reset syncing guard
    const { syncPull } = await import('./sync.js')
    await syncPull()

    const a = await db.attendees.get(1)
    expect(a.name).toBe('Titania')
    expect(await getLastSync()).toBe('2026-03-01T12:00:00Z')
  })

  it('deletes soft-deleted attendees from Dexie', async () => {
    await db.attendees.put({ id: 1, name: 'Titania' })

    mockFetch({
      server_time: '2026-03-01T13:00:00Z',
      attendees: [{ id: 1, name: 'Titania', deleted_at: '2026-03-01T12:30:00Z' }],
      departments: [],
      volunteers: [],
      shifts: [],
      volunteer_shifts: [],
    })
    const { syncPull } = await import('./sync.js')
    await syncPull()

    const a = await db.attendees.get(1)
    expect(a).toBeUndefined()
  })

  it('deletes soft-deleted volunteer_shifts from Dexie', async () => {
    await db.volunteer_shifts.put({ volunteer_id: 1, shift_id: 2 })

    mockFetch({
      server_time: '2026-03-01T13:00:00Z',
      attendees: [],
      departments: [],
      volunteers: [],
      shifts: [],
      volunteer_shifts: [{ volunteer_id: 1, shift_id: 2, deleted_at: '2026-03-01T12:30:00Z' }],
    })
    const { syncPull } = await import('./sync.js')
    await syncPull()

    const vs = await db.volunteer_shifts.get([1, 2])
    expect(vs).toBeUndefined()
  })

  it('sets lastSync timestamp', async () => {
    mockFetch({
      server_time: '2026-03-02T00:00:00Z',
      attendees: [],
      departments: [],
      volunteers: [],
      shifts: [],
      volunteer_shifts: [],
    })
    const { syncPull } = await import('./sync.js')
    await syncPull()
    expect(await getLastSync()).toBe('2026-03-02T00:00:00Z')
  })
})