import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest'
import { setActivePinia, createPinia } from 'pinia'
import { useDownloadsStore } from '../src/stores/downloads.js'

function stubFetch(handler) {
  globalThis.fetch = vi.fn(async (url, init) => {
    const { status, body } = handler(url, init)
    return {
      ok: status >= 200 && status < 300,
      status, statusText: String(status),
      text: async () => (body == null ? '' : JSON.stringify(body)),
    }
  })
}

describe('downloads store', () => {
  beforeEach(() => setActivePinia(createPinia()))
  afterEach(() => vi.restoreAllMocks())

  it('loadFirst populates events and cursor', async () => {
    const s = useDownloadsStore()
    stubFetch(() => ({
      status: 200,
      body: [
        { id: 10, status: 'ok', summary: {} },
        { id: 9, status: 'error', summary: {} },
      ],
    }))
    await s.loadFirst()
    expect(s.events.map(e => e.id)).toEqual([10, 9])
    expect(s.cursor).toBe(9)
    expect(s.hasMore).toBe(false)
  })

  it('loadMore appends and updates cursor', async () => {
    const s = useDownloadsStore()
    s.events = [{ id: 10, summary: {} }, { id: 9, summary: {} }]
    s.cursor = 9
    s.hasMore = true
    stubFetch(() => ({
      status: 200,
      body: [{ id: 8, status: 'ok', summary: {} }],
    }))
    await s.loadMore()
    expect(s.events.map(e => e.id)).toEqual([10, 9, 8])
    expect(s.cursor).toBe(8)
  })

  it('applyFilter merges and reloads', async () => {
    const s = useDownloadsStore()
    const urls = []
    stubFetch((url) => {
      urls.push(url)
      return { status: 200, body: [] }
    })
    await s.applyFilter({ status: 'error' })
    expect(s.filter.status).toBe('error')
    expect(urls[0]).toContain('status=error')
  })

  it('loadOne populates selected', async () => {
    const s = useDownloadsStore()
    stubFetch(() => ({ status: 200, body: { id: 42, metadata: { run_stats: {} } } }))
    const out = await s.loadOne(42)
    expect(s.selected.id).toBe(42)
    expect(out.id).toBe(42)
  })

  it('closeDetail clears selected', async () => {
    const s = useDownloadsStore()
    s.selected = { id: 1 }
    s.closeDetail()
    expect(s.selected).toBe(null)
  })
})