import { NextRequest, NextResponse } from 'next/server'
import { auth } from '@/auth'
import prisma from '@/lib/prisma'
import { syncNoteLabels } from '@/app/actions/notes'
import { createNotification } from '@/app/actions/notifications'
import { buildClipSourceFooter, clipFooterLocaleTag } from '@/lib/clip/extract-article'
import { resolveClipLocale, wrapClipArticleHtml, applyRtlToHtmlBlocks } from '@/lib/clip/rtl-content'
import { embeddingService } from '@/lib/ai/services/embedding.service'
import { upsertNoteEmbedding } from '@/lib/embeddings'
import DOMPurify from 'isomorphic-dompurify'

function isBlockedUrl(url: string): boolean {
  try {
    const parsed = new URL(url)
    const hostname = parsed.hostname.toLowerCase()
    if (parsed.protocol !== 'http:' && parsed.protocol !== 'https:') return true
    return ['localhost', '127.0.0.1', '0.0.0.0', '::1'].includes(hostname)
  } catch {
    return true
  }
}

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

    const body = await request.json()
    const url = typeof body.url === 'string' ? body.url.trim() : ''
    const title = typeof body.title === 'string' ? body.title.trim().slice(0, 300) : null
    const rawContent = typeof body.content === 'string' ? body.content : ''
    const summary = typeof body.summary === 'string' ? body.summary.trim() : ''
    const notebookId = typeof body.notebookId === 'string' ? body.notebookId : null
    const tags = Array.isArray(body.tags)
      ? body.tags.filter((t: unknown): t is string => typeof t === 'string').slice(0, 5)
      : []

    if (!url || isBlockedUrl(url)) {
      return NextResponse.json({ error: 'Invalid URL' }, { status: 400 })
    }
    if (!rawContent.trim()) {
      return NextResponse.json({ error: 'Content required' }, { status: 400 })
    }

    await prisma.user.upsert({
      where: { id: session.user.id },
      update: {
        ...(session.user.email ? { email: session.user.email } : {}),
        ...(session.user.name !== undefined ? { name: session.user.name } : {}),
      },
      create: {
        id: session.user.id,
        email: session.user.email || `user-${session.user.id}@local.momento`,
        name: session.user.name || null,
      },
    })

    const domain = new URL(url).hostname.replace(/^www\./, '')
    const locale = resolveClipLocale(url, title || '', summary, rawContent.replace(/<[^>]+>/g, ' '))
    const sanitizedContent = DOMPurify.sanitize(rawContent)
    const rtlBlocks = applyRtlToHtmlBlocks(sanitizedContent, locale)
    const summaryBlock = summary
      ? `<p dir="${locale.direction}"${locale.lang ? ` lang="${locale.lang}"` : ''}><em>${DOMPurify.sanitize(summary)}</em></p>`
      : ''
    const footer = buildClipSourceFooter(domain, new Date(), clipFooterLocaleTag(locale.lang))
    const bodyHtml = rtlBlocks.includes('clip-article--rtl')
      ? rtlBlocks
      : wrapClipArticleHtml(rtlBlocks, locale)
    const fullContent = `${summaryBlock}${bodyHtml}${footer}`

    const note = await prisma.note.create({
      data: {
        userId: session.user.id,
        title: title || domain,
        content: fullContent,
        type: 'richtext',
        notebookId,
        sourceUrl: url,
        autoGenerated: true,
        ...(locale.lang ? { language: locale.lang } : {}),
      },
    })

    void (async () => {
      try {
        const { embedding } = await embeddingService.generateNoteEmbedding(
          title || domain,
          fullContent,
        )
        if (embedding?.length) {
          await upsertNoteEmbedding(note.id, embedding)
        }
      } catch (error) {
        console.error('[clip/save] embedding generation failed:', error)
      }
    })()

    if (tags.length > 0) {
      await syncNoteLabels(note.id, tags, notebookId, session.user.id)
    }

    const noteUrl = `/home?openNote=${encodeURIComponent(note.id)}`

    await createNotification({
      userId: session.user.id,
      type: 'clip',
      title: title || domain,
      message: summary || undefined,
      actionUrl: noteUrl,
      relatedId: note.id,
    })

    return NextResponse.json({ noteId: note.id, noteUrl })
  } catch (error) {
    console.error('[POST /api/clip/save]', error)
    return NextResponse.json({ error: 'Save failed' }, { status: 500 })
  }
}