medical_records

main.go

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
	"sort"
	"time"
)

func main() {
	results := retrieveAllRecords()
	var guest []int
	for _, record := range results {
		age, err := years(record.UserDob)
		if err != nil {
			continue
		}
    // hard code for now the requirements
		if age < 20 || age > 30 {
			continue
		}
    // hard code for now the requirements
		if record.Vitals.BloodPressureDiastole-record.Vitals.BloodPressureSystole > 1 {
			guest = append(guest, record.ID)
		}
	}
	sort.Ints(guest)
	fmt.Println(guest)
}

// Download all records in parallel
func retrieveAllRecords() []MedicalRecord {
	var results []MedicalRecord
	data := downloadPage(0)
	done := make(chan *MedicalRecordResponse)
	for page := 1; page <= data.TotalPages; page++ {
		go func(page int) {
			done <- downloadPage(page)
		}(page)
	}

	for j := 1; j <= data.TotalPages; j++ {
		outcome := <-done
		results = append(results, outcome.Data...)
	}
	return results
}

// return age from dob string
func years(dob string) (float64, error) {
	timeDob, err := time.Parse("02-01-2006", dob)
	if err != nil {
		return 0, err
	}
	delta := time.Now().Sub(timeDob)
	years := delta.Seconds() / 31207680
	return years, nil
}

func downloadPage(page int) *MedicalRecordResponse {
	r, err := http.Get(fmt.Sprintf("https://jsonmock.hackerrank.com/api/medical_records?&page=%d", page))
	if err != nil {
		fmt.Println(err)
	}
	defer r.Body.Close()
	var j *MedicalRecordResponse
	err = json.NewDecoder(r.Body).Decode(&j)
	if err != nil {
		fmt.Println(err)
	}
	return j
}

// Json data structure format
type MedicalRecordResponse struct {
	TotalPages int             `json:"total_pages"`
	Data       []MedicalRecord `json:"data"`
}

type MedicalRecord struct {
	ID        int   `json:"id"`
	Timestamp int64 `json:"timestamp"`
	Vitals    struct {
		BloodPressureDiastole int     `json:"bloodPressureDiastole"`
		BloodPressureSystole  int     `json:"bloodPressureSystole"`
		Pulse                 int     `json:"pulse"`
		BreathingRate         int     `json:"breathingRate"`
		BodyTemperature       float32 `json:"bodyTemperature"`
	} `json:"vitals"`
	UserID   int    `json:"userId"`
	UserName string `json:"userName"`
	UserDob  string `json:"userDob"`
}

type Patient struct {
	Id int `json:"id"`
}