import { NextResponse } from 'next/server'
import { ensureInitialized } from '@/lib/init'
import { withRouteContext } from '@/lib/api/with-route-context'
import { deleteDocument } from '@/lib/core/documents/document-service'
import { eventBus } from '@/lib/events'

ensureInitialized()

/**
 * GET /api/documents/:id
 * Fetch document metadata + signed download URL (60 min expiry)
 */
export const GET = withRouteContext<{ params: Promise<{ id: string }> }>(
  'document.get',
  async (_request, { supabase, companyId, user }, { params }) => {
    const { id } = await params

    // Fetch document record
    const { data: doc, error: docError } = await supabase
      .from('document_attachments')
      .select('*')
      .eq('id', id)
      .eq('company_id', companyId)
      .single()

    if (docError || !doc) {
      return NextResponse.json({ error: 'Document not found' }, { status: 404 })
    }

    // Create signed download URL (60 minutes)
    const { data: signedUrl, error: signError } = await supabase.storage
      .from('documents')
      .createSignedUrl(doc.storage_path, 3600)

    if (signError) {
      return NextResponse.json(
        { error: `Failed to create download URL: ${signError.message}` },
        { status: 500 }
      )
    }

    await eventBus.emit({
      type: 'document.accessed',
      payload: {
        document: { id: doc.id, file_name: doc.file_name },
        userId: user.id,
        companyId,
      },
    })

    return NextResponse.json({
      data: {
        ...doc,
        download_url: signedUrl.signedUrl,
      },
    })
  }
)

/**
 * DELETE /api/documents/:id
 * Remove an uploaded document. Only permitted when the document is not yet
 * linked to a journal entry: once linked, it is räkenskapsinformation under
 * BFL 7 kap 2§ and must be retained for 7 years. For linked docs the caller
 * should use POST /api/documents/:id/versions to supersede via a new version.
 */
export const DELETE = withRouteContext<{ params: Promise<{ id: string }> }>(
  'document.delete',
  async (_request, { supabase, companyId }, { params }) => {
    const { id } = await params

    try {
      const result = await deleteDocument(supabase, companyId, id)

      if (!result.ok) {
        return NextResponse.json({ error: result.message }, { status: result.status })
      }

      return NextResponse.json({ data: { id: result.document.id, deleted: true } })
    } catch (error) {
      console.error('[documents/DELETE] Failed to delete document:', error)
      return NextResponse.json(
        { error: error instanceof Error ? error.message : 'Failed to delete document' },
        { status: 500 }
      )
    }
  },
  { requireWrite: true }
)