LivePoll/backend/src/services/poll.service.js

import mongoose from "mongoose";
import { createPollByData, deletePollById, findPollById, findPollsByCreatorId, updatePollVoteCount } from "../repositories/poll.repo.js";
import { createVote, findVoteByPollIdAndUserId } from "../repositories/vote.repo.js";

export async function createPollService(title, description, options, userId) {
    try {
        const optionsData = options.map(option => ({
            name: option,
            _id : new mongoose.Types.ObjectId(),
            voteCount : 0
        }));

        const data = {
            title,
            description,
            options : optionsData,
            creatorId: userId
        }
        const poll = await createPollByData(data);
        return poll;
    }
    catch(err){
        throw err;
    }
}

export async function getPollDataService(pollId) {
    try {
        const poll = await findPollById(pollId);
        if (!poll) {
            throw {
                statusCode: 404,
                message: "Poll not found"
            }
        }
        const {creatorId, ...pollData} = poll._doc;
        const {username, _id, ...creatorData} = creatorId._doc;
        return {pollData, creatorData : {username, _id}};
    }
    catch(err){
        throw err;
    }
}

export async function getAllCreatedPollsService(id) {
    try {
        const polls = await findPollsByCreatorId(id);
        return polls;
    }
    catch(err){
        throw err;
    }
}

export async function deletePollService(pollId, user) {
    try {
        const userId = user._id;
        const poll = await findPollById(pollId);
        if (!poll) {
            throw {
                statusCode: 404,
                message: "Poll not found"
            }
        }
        console.log(poll?.creatorId._id.toString(), userId.toString(), user);
        if (poll.creatorId._id.toString() !== userId.toString()) {
            throw {
                statusCode: 401,
                message: "Unauthorized"
            }
        }
        const deletedPoll = await deletePollById(pollId);
        return deletedPoll;
    }

    catch(err){
        throw err;
    }
}

export async function createVoteService(pollId, userId, optionId) {
    try {
        // vote already voted
        const vote = await findVoteByPollIdAndUserId(pollId, userId);
        if (vote) {
            throw {
                statusCode: 400,
                message: "You have already voted on this poll"
            }
        }
        console.log(pollId, userId, optionId);
        const poll = await findPollById(pollId);
        if (!poll) {
            throw {
                statusCode: 404,
                message: "Poll not found"
            }
        }
        const updatedPollData = await updatePollVoteCount(pollId, optionId);
        const createdVote = await createVote(pollId, userId, optionId);
        console.log(updatedPollData)
        return createVote;
        
    }
    catch(err){
        throw err;
    }
}