export type MockResponse = {
  status: number
  body?: unknown
  delayMs?: number
}

declare global {
  // eslint-disable-next-line no-var
  var routeHandlers: Map<string, (init?: RequestInit) => MockResponse | Promise<MockResponse>>
}

export function installFetchMock() {
  globalThis.routeHandlers = new Map()
  globalThis.fetch = (async (input: RequestInfo | URL, init?: RequestInit) => {
    const url = typeof input === 'string' ? input : input.toString()
    const path = url.replace(/^https?:\/\/[^/]+/, '').replace(/^\/api/, '') || url

    const handler = globalThis.routeHandlers.get(path)
    if (!handler) {
      return new Response(JSON.stringify({ error: 'not found' }), { status: 404 })
    }

    const spec = await handler(init)
    if (spec.delayMs && spec.delayMs > 0) {
      await new Promise((r) => setTimeout(r, spec.delayMs))
    }
    return new Response(JSON.stringify(spec.body ?? {}), {
      status: spec.status,
      headers: { 'Content-Type': 'application/json' },
    })
  }) as typeof fetch
}

export async function resetAppTestState() {
  const { resetSessionTrackingForTests } = await import('../../src/api/authSession')
  const { resetUserStateRevisionForTests, resetMeMutationSyncForTests } = await import(
    '../../src/api/sync'
  )
  const { resetMeMutationQueueForTests } = await import('../../src/api/meMutationQueue')
  const { resetCatalogFetchSyncForTests } = await import('../../src/api/catalogFetchSync')
  const { setAuthToken } = await import('../../src/api/token')
  const { resetAppBootstrap } = await import('../../src/api/bootstrapState')
  resetSessionTrackingForTests()
  resetUserStateRevisionForTests()
  resetMeMutationSyncForTests()
  resetMeMutationQueueForTests()
  resetCatalogFetchSyncForTests()
  resetAppBootstrap()
  setAuthToken(null)
}