Ticket-Raffling

ticket-raffling.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"math/rand"
	"os"
	"time"
)

type People struct {
	People []Person `json:"users"`
}

type Person struct {
	Email    string      `json:"email"`
	FullName string      `json:"full_name"`
}

func main() {

	// load data from file
	people, err := readFile("people.json")
	if err != nil {
		fmt.Println(err)
	}

	// randomise the seed
	rand.Seed(time.Now().UnixNano())

	// shuffle the slice
	rand.Shuffle(len(people.People), func(i, j int) {
		people.People[i], people.People[j] = people.People[j], people.People[i]
	})

	//randomise the winners
	winner := rand.Int63n(int64(len(people.People)-1))

	fmt.Printf("Winner is: %s", people.People[winner])
	fmt.Println()
}


func readFile(file string) (People, error) {
	jsonFile, err := os.Open(file)
	if err != nil {
		return People{}, err
	}
	defer jsonFile.Close()

	byteData, err := ioutil.ReadAll(jsonFile)
	if err != nil {
		return People{}, err
	}

	var people People
	err = json.Unmarshal(byteData, &people)
	if err != nil {
		return People{}, err
	}

	return people, nil
}






P.S (IMPORTANT):
The JSON file (you wuld have to get the data from the form being filled by members) should follow this format:
{
  "users": [
    {
      "email": "adeshina@example.com",
      "full_name": "Adeshina Hassan"
    },
    {
      "email": "Endy@example.com",
      "full_name": "Endy"
    },
  ]
}