import { Router } from 'express'
import { auth } from '../middleware/auth.js'

const OLLAMA_URL   = process.env.OLLAMA_URL   || 'http://localhost:11434'
const OLLAMA_MODEL = process.env.OLLAMA_MODEL || 'llama3.2'

const FALLBACK = [
  "A letter arrives addressed to you — dated ten years in the future. It says only: 'Don't go to the old lighthouse on Friday.'",
  "Your new neighbour asks you to water one plant while they're away. On day two, it whispers your name.",
  "Every mirror in the city goes dark overnight. Yours still shows a reflection — but it isn't yours.",
  "You find your grandmother's diary from when she was your age. The last entry describes something happening to you. Today.",
  "A bookshop appears on your street that wasn't there yesterday. Inside are books about your life — including things that haven't happened yet.",
  "The last dragon in the world lands in your garden. It is very small and very scared.",
  "You win a competition you never entered. The prize is one hour of flying.",
  "Everyone in your town wakes up speaking a different language. Everyone except you.",
  "There is a trapdoor under your bed that opens onto an upside-down forest.",
  "Every story you write comes true — but always with one small, wrong detail.",
  "The lighthouse has been dark for fifty years. The night you finally climb to the top, you find the lamp still warm.",
  "Two kingdoms at war agree to peace. Each must send their most precious thing as a gift. Both kingdoms send the same person.",
  "Your shadow starts leaving notes under your pillow.",
  "The old tree at the centre of the village is cut down. Inside is a room. Inside the room is a child who has never seen the sky.",
  "You are the only one who can hear the sea talking. It is furious about something.",
  "A train arrives at your station that isn't on any timetable. The conductor says you have been expected.",
  "You find a photograph of your house — taken fifty years before it was built.",
  "The stars rearrange themselves every night. Last night you finally worked out what language they're writing in.",
  "A girl discovers she can rewind the last ten seconds of any conversation — but only once per person.",
  "The town clockmaker stops every clock at midnight. By morning, she is gone. So is yesterday.",
]

const router = Router()
router.use(auth)

router.get('/', async (req, res) => {
  try {
    const r = await fetch(`${OLLAMA_URL}/api/generate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        model: OLLAMA_MODEL,
        prompt: 'Write one creative writing prompt for a young writer aged 10–14. Make it imaginative, specific, and intriguing — a little mysterious or adventurous. Write only the prompt itself: no introduction, no explanation, no quotation marks. Maximum two sentences.',
        stream: false,
      }),
      signal: AbortSignal.timeout(8000),
    })
    if (!r.ok) throw new Error('bad status')
    const data = await r.json()
    const prompt = data.response?.trim()
    if (!prompt) throw new Error('empty')
    res.json({ prompt, source: 'ollama', model: OLLAMA_MODEL })
  } catch {
    const prompt = FALLBACK[Math.floor(Math.random() * FALLBACK.length)]
    res.json({ prompt, source: 'local' })
  }
})

export default router