import { getGameDb } from '@/lib/db/client'
import { ShipError, buildSystem } from '@/lib/game/ship'

// Build an unbuilt ship system type at base values. Body: { "type": string }.
// Costs inventory items + a turn; returns the fresh ship state.
export async function POST(req: Request) {
  let body: unknown
  try {
    body = await req.json()
  } catch {
    return Response.json({ error: 'Invalid JSON body' }, { status: 400 })
  }

  const type = (body as { type?: unknown }).type
  if (typeof type !== 'string' || type.length === 0) {
    return Response.json({ error: 'type must be a non-empty string' }, { status: 400 })
  }

  try {
    const db = await getGameDb()
    return Response.json(await buildSystem(db, type))
  } catch (err) {
    if (err instanceof ShipError) {
      return Response.json({ error: err.message }, { status: err.status })
    }
    throw err
  }
}