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

// Raise a built ship system's capacity by one (capped at max capacity). Body: { "systemId": number }.
// 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 systemId = (body as { systemId?: unknown }).systemId
  if (typeof systemId !== 'number' || !Number.isInteger(systemId)) {
    return Response.json({ error: 'systemId must be an integer' }, { status: 400 })
  }

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