/**
 * @vitest-environment node
 */
import { afterEach, describe, expect, it, vi } from 'vitest'
import {
  FALAI_HOSTED_KEY_MARKUP_MULTIPLIER,
  FALAI_IMAGE_FALLBACK_PROVIDER_COST_DOLLARS,
  getFalAICostMetadata,
} from '@/lib/tools/falai-pricing'
import { imageGenerateTool } from '@/tools/image/generate'
import { falaiVideoTool } from '@/tools/video/falai'

afterEach(() => {
  vi.useRealTimers()
  vi.unstubAllGlobals()
})

describe('Fal.ai hosted key pricing', () => {
  it('applies hosted markup to image generation provider cost', () => {
    const pricing = imageGenerateTool.hosting?.pricing
    expect(pricing?.type).toBe('custom')
    if (!pricing || pricing.type !== 'custom') throw new Error('Expected custom pricing')

    const result = pricing.getCost(
      {},
      {
        __falaiCostDollars: 0.1,
        __falaiBilling: {
          source: 'billing_events',
          endpointId: 'fal-ai/nano-banana-2',
        },
      }
    )

    expect(typeof result).toBe('object')
    if (typeof result === 'number') throw new Error('Expected structured pricing result')
    expect(result.cost).toBeCloseTo(0.1 * FALAI_HOSTED_KEY_MARKUP_MULTIPLIER)
    expect(result.metadata).toMatchObject({
      providerCostDollars: 0.1,
      markupMultiplier: FALAI_HOSTED_KEY_MARKUP_MULTIPLIER,
      source: 'billing_events',
    })
  })

  it('applies hosted markup to video generation provider cost', () => {
    const pricing = falaiVideoTool.hosting?.pricing
    expect(pricing?.type).toBe('custom')
    if (!pricing || pricing.type !== 'custom') throw new Error('Expected custom pricing')

    const result = pricing.getCost(
      {},
      {
        __falaiCostDollars: 0.4,
        __falaiBilling: {
          source: 'billing_events',
          endpointId: 'fal-ai/veo3.1',
        },
      }
    )

    expect(typeof result).toBe('object')
    if (typeof result === 'number') throw new Error('Expected structured pricing result')
    expect(result.cost).toBeCloseTo(0.4 * FALAI_HOSTED_KEY_MARKUP_MULTIPLIER)
    expect(result.metadata).toMatchObject({
      providerCostDollars: 0.4,
      markupMultiplier: FALAI_HOSTED_KEY_MARKUP_MULTIPLIER,
      source: 'billing_events',
    })
  })

  it('returns fallback floor cost metadata instead of throwing when billing and estimate fail', async () => {
    vi.useFakeTimers()

    const mockFetch = vi
      .fn()
      .mockResolvedValueOnce(
        new Response(JSON.stringify({ billing_events: [] }), {
          status: 200,
          headers: { 'Content-Type': 'application/json' },
        })
      )
      .mockResolvedValueOnce(
        new Response(JSON.stringify({ billing_events: [] }), {
          status: 200,
          headers: { 'Content-Type': 'application/json' },
        })
      )
      .mockResolvedValueOnce(new Response('pricing unavailable', { status: 500 }))
    vi.stubGlobal('fetch', mockFetch)

    const resultPromise = getFalAICostMetadata({
      apiKey: 'fal-key',
      endpointId: 'fal-ai/nano-banana-2',
      requestId: 'request-1',
    })

    await vi.advanceTimersByTimeAsync(500)
    const result = await resultPromise

    expect(result).toMatchObject({
      endpointId: 'fal-ai/nano-banana-2',
      requestId: 'request-1',
      costDollars: FALAI_IMAGE_FALLBACK_PROVIDER_COST_DOLLARS,
      source: 'fallback_floor',
      currency: 'USD',
    })
  })
})