/**
 * Tests for loadPdfJs stub function.
 *
 * loadPdfJs is a stub that:
 * 1. Returns a resolved Promise<any> (resolving to undefined)
 * 2. Emits a one-shot console.warn on first call per page-load
 *
 * The function exists for Obsidian API compatibility. Plugins that call
 * loadPdfJs() to initialize PDF.js rendering will not crash, but
 * actual PDF rendering is not supported (PDF.js is not bundled).
 */

import { describe, it, expect, vi, beforeEach } from 'vitest'
import { loadPdfJs, _resetWarnedStubs } from '../obsidian-stubs'

beforeEach(() => {
  _resetWarnedStubs()
  vi.restoreAllMocks()
})

describe('loadPdfJs', () => {
  it('returns a resolved Promise<any> (undefined)', async () => {
    const result = await loadPdfJs()
    expect(result).toBeUndefined()
  })

  it('emits a console.warn on first call', async () => {
    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {})

    await loadPdfJs()

    expect(warnSpy).toHaveBeenCalledOnce()
    expect(warnSpy).toHaveBeenCalledWith(
      expect.stringContaining('[Reams] loadPdfJs')
    )
  })

  it('emits console.warn only once per page-load (warn-once)', async () => {
    const warnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {})

    await loadPdfJs()
    await loadPdfJs()
    await loadPdfJs()

    expect(warnSpy).toHaveBeenCalledOnce()
  })

  it('can be called multiple times without error', async () => {
    // Suppress console.warn for cleaner test output
    vi.spyOn(console, 'warn').mockImplementation(() => {})

    // Should not throw, all calls resolve to undefined
    expect(await loadPdfJs()).toBeUndefined()
    expect(await loadPdfJs()).toBeUndefined()
    expect(await loadPdfJs()).toBeUndefined()
  })
})