import { CreateWorldRequestSchema, WorldStarterSchema, moderate13Plus } from '@dng/shared'
import { buildJsonCompletion, parseJsonCompletion } from '../../utils/ai-provider'

export default defineEventHandler(async event => {
  const raw = await readBody(event)
  const prompt = typeof raw?.prompt === 'string' ? raw.prompt : ''
  const answers = raw?.answers && typeof raw.answers === 'object' ? raw.answers : {}
  const moderation = moderate13Plus(`${prompt} ${Object.values(answers).join(' ')}`)
  if (!moderation.allowed) throw createError({ statusCode: 422, statusMessage: 'This concept falls outside the alpha’s 13+ content boundary.' })

  const config = useRuntimeConfig()
  const request = CreateWorldRequestSchema.parse({ messages: [{ role: 'user', content: `${prompt}\nPreferences: ${JSON.stringify(answers)}` }] })
  let completion
  try {
    completion = buildJsonCompletion(config, {
      system: 'Create an original 13+ TTRPG starting world. Return only valid JSON matching the supplied WorldStarter structure, with exactly 3 NPCs and 2 factions. Do not use protected franchises.',
      messages: request.messages,
      schemaName: 'world_starter',
      jsonSchema: WorldStarterSchema.toJSONSchema(),
    })
  } catch (error) {
    throw createError({ statusCode: 500, statusMessage: error instanceof Error ? error.message : 'Invalid AI provider configuration.' })
  }

  const response = await fetch(completion.endpoint, {
    method: 'POST',
    headers: completion.headers,
    body: JSON.stringify(completion.body),
  })
  if (!response.ok) throw createError({ statusCode: 502, statusMessage: 'The coauthor is temporarily unavailable.' })
  try {
    return WorldStarterSchema.parse(parseJsonCompletion(await response.json()))
  } catch {
    throw createError({ statusCode: 502, statusMessage: 'The coauthor returned an invalid world structure.' })
  }
})