import { NextRequest, NextResponse } from 'next/server'
import { requireAdmin } from '@/lib/auth'
import { getDb } from '@/lib/db'

export async function PATCH(request: NextRequest) {
  const auth = await requireAdmin(request)
  if (auth instanceof NextResponse) return auth

  const body = await request.json()
  const { itemKey, title, year, plot, genres } = body as {
    itemKey: string
    title?: string
    year?: number | null
    plot?: string | null
    genres?: string[]
  }

  if (!itemKey) {
    return NextResponse.json({ error: 'Missing itemKey' }, { status: 400 })
  }

  const db = getDb()
  const row = db.prepare('SELECT metadata FROM media_items WHERE item_key = ?').get(itemKey) as { metadata: string | null } | undefined
  if (!row) {
    return NextResponse.json({ error: 'Item not found' }, { status: 404 })
  }

  const sets: string[] = []
  const params: Record<string, unknown> = { item_key: itemKey }

  if (title !== undefined) {
    sets.push('title = @title')
    params.title = title
  }
  if (year !== undefined) {
    sets.push('year = @year')
    params.year = year
  }
  if (plot !== undefined) {
    sets.push('plot = @plot')
    params.plot = plot
  }
  if (genres !== undefined) {
    sets.push('genres = @genres')
    params.genres = JSON.stringify(genres)
  }

  // Always mark as manually edited in the metadata blob
  const existingMeta = row.metadata ? JSON.parse(row.metadata) : {}
  existingMeta.manuallyEdited = true
  sets.push('metadata = @metadata')
  params.metadata = JSON.stringify(existingMeta)

  if (sets.length === 0) {
    return NextResponse.json({ error: 'No fields to update' }, { status: 400 })
  }

  db.prepare(`UPDATE media_items SET ${sets.join(', ')} WHERE item_key = @item_key`).run(params)

  return NextResponse.json({ success: true })
}