import { defineEventHandler } from 'h3'
import { validate_challenge } from '@impost/lib/validator';
import * as z from 'zod';
import { outstandingChallenges } from '~~/server/utils/pow';

const challengeSchema = z.object({
    challenge: z.string(),
    nonce: z.string()
})

// post handler that takes in the challenge, and the nonce
export default defineEventHandler(async (event) => {
    const body = await readValidatedBody(event, challengeSchema.safeParse);

    if (!body.success) {
        const errors = z.treeifyError(body.error);
        const error_message = Object.entries(errors.errors).map(([key, value]) => `${key}: ${value}`).join('\n');

        throw createError({
            statusCode: 400,
            statusMessage: error_message
        })
    }

    let { challenge, nonce } = body.data;

    const outstanding_challenge = outstandingChallenges.get(body.data.challenge)!;
    // always delete the challenge on a solve attempt
    clearTimeout(outstanding_challenge.timeout);
    outstandingChallenges.delete(challenge);

    // check if the challenge is valid
    let challenge_valid = await validate_challenge(outstandingChallenges.get(challenge)!.challenge, {
        challenge,
        nonce,
    });

    if (challenge_valid) {
        return {
            message: 'Challenge solved'
        };
    }

    throw createError({
        statusCode: 400,
        statusMessage: 'Challenge is not valid'
    })
})