Enhancing Voting Systems with Advanced Go Features

package main

import (
    "sort"
)

type VotingSystem struct {
    candidates map[string]int
    voters     map[string]*VotingHistory
}

type VotingHistory struct {
    Votes      []string
    Timestamps []int64
}

func NewVotingSystem() *VotingSystem {
    return &VotingSystem{
        candidates: make(map[string]int),
        voters:     make(map[string]*VotingHistory),
    }
}

func (vs *VotingSystem) RegisterCandidate(candidateId string) bool {
    if _, exists := vs.candidates[candidateId]; exists {
        return false // Candidate is already registered
    }
    vs.candidates[candidateId] = 0 // Initialize candidates with 0 votes
    return true
}

func (vs *VotingSystem) Vote(timestamp int64, voterId string, candidateId string) bool {
    if _, exists := vs.candidates[candidateId]; !exists {
        return false // Return false if the candidate is not registered
    }
    voterHistory, exists := vs.voters[voterId]
    if !exists {
        voterHistory = &VotingHistory{}
        vs.voters[voterId] = voterHistory
    }
    voterHistory.Votes = append(voterHistory.Votes, candidateId)
    voterHistory.Timestamps = append(voterHistory.Timestamps, timestamp)
    vs.candidates[candidateId]++
    return true
}

func (vs *VotingSystem) GetVotes(candidateId string) *int {
    if votes, exists := vs.candidates[candidateId]; exists {
        return &votes
    }
    return nil
}

func (vs *VotingSystem) TopNCandidates(n int) []string {
    type candidateVote struct {
        id    string
        votes int
    }

    var candidateList []candidateVote
    for id, votes := range vs.candidates {
        candidateList = append(candidateList, candidateVote{id, votes})
    }

    sort.Slice(candidateList, func(i, j int) bool {
        return candidateList[i].votes > candidateList[j].votes
    })

    var topCandidates []string
    for i := 0; i < n && i < len(candidateList); i++ {
        topCandidates = append(topCandidates, candidateList[i].id)
    }
    return topCandidates
}