import { db } from "./db.mjs"
import logger from "./logger.mjs"

const blocklist = db.union([
    db('bad_words').select('word'),
    db('medical_dictionary').select('word'),
    db('published').select('word')
])


export default async function getNewPrompt({ minCount = 200000, maxCount = 30000000, rarityBias = 0.5 }) {
    const childLogger = logger.child({minCount,maxCount,rarityBias})
    childLogger.trace("getNewPrompt called")
    const prompts = await db('dictionary')
        .select('*')
        .where({
            derivative: 0,
            scientific: 0,
        })
        .andWhere('count', '<', maxCount)
        .andWhere('count', '>', minCount)
        .andWhere('word', 'not in', blocklist)
        .whereRaw('length(word) > 3')
        .whereNotNull('pronunciation')
        .orderByRaw('count desc')
        .catch(error=>{return error})

        if(prompts instanceof Error){return prompts}

    const getBiasedRng = (min, max, bias, influence) => {
        const random = Math.random() * (max - min) + min
        const mix = Math.random() * influence
        return random * (1 - mix) + bias * mix
    }

    const randomEntry = (array) => {
        const random = getBiasedRng(0, 1, rarityBias, 1)
        const mix = Math.random()
        return array[
            parseInt(
                array.length * random
            )
        ]
    }

    //await db.destroy()
    return await randomEntry(prompts)
}





//console.dir(await getNewPrompt({}))

//console.log(await blocklist)