import { NextRequest, NextResponse } from 'next/server'
import { auth } from '@/auth'
import { getAISettings } from '@/app/actions/ai-settings'
import { describeImages } from '@/lib/ai/services/image-description.service'
import { hasUserAiConsent } from '@/lib/consent/server-consent'
import { withAiQuota, handleQuotaHttpError } from '@/lib/ai-quota'

export async function POST(req: NextRequest) {
  try {
    const session = await auth()
    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Unauthorized' }, { status: 401 })
    }

    if (!(await hasUserAiConsent())) {
      return NextResponse.json({ error: 'ai_consent_required' }, { status: 403 })
    }

    const userSettings = await getAISettings(session.user.id)
    if (userSettings.paragraphRefactor === false) {
      return NextResponse.json({ error: 'Feature disabled' }, { status: 403 })
    }

    const { imageUrls, mode, language } = await req.json()

    if (!Array.isArray(imageUrls) || imageUrls.length === 0) {
      return NextResponse.json({ error: 'imageUrls must be a non-empty array' }, { status: 400 })
    }

    const isTitleMode = mode === 'title'
    const feature = isTitleMode ? 'auto_title' : 'reformulate'
    const lane = isTitleMode ? 'tags' : 'chat'

    const result = await withAiQuota(
      session.user.id,
      feature,
      () => describeImages(
        imageUrls,
        isTitleMode ? 'title' : 'description',
        language || 'fr'
      ),
      { lane },
    )

    if (isTitleMode && result.suggestions) {
      return NextResponse.json({ suggestions: result.suggestions })
    }

    return NextResponse.json(result)
  } catch (error: unknown) {
    const quotaResp = handleQuotaHttpError(error)
    if (quotaResp) return quotaResp
    console.error('[describe-image] Error:', error)
    const message = error instanceof Error ? error.message : 'Failed to describe image'
    return NextResponse.json({ error: message }, { status: 500 })
  }
}