add interactive fizzbuzz in golang

interactive_fizz.go

@@ -0,0 +1,139 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"strings"
+)
+
+type ExampleResponse struct {
+	Answer string `json:"answer"`
+}
+
+type Rules struct {
+	Number int    `json:"number"`
+	Resp   string `json:"response"`
+}
+
+type Response struct {
+	Message string          `json:"message"`
+	Next    string          `json:"nextQuestion"`
+	Numbers []int           `json:"numbers"`
+	Result  string          `json:"result"`
+	Rules   []Rules         `json:"rules"`
+	Example ExampleResponse `json:"exampleResponse"`
+}
+
+func checkError(err error) {
+	if err != nil {
+		panic(err.Error())
+	}
+}
+
+func checkAnswer(url, ans string) (Response, error) {
+	buf := new(bytes.Buffer)
+	err := json.NewEncoder(buf).Encode(ExampleResponse{Answer: ans})
+	checkError(err)
+	res, err := http.Post(url, "application/json", buf)
+	checkError(err)
+
+	return parseResponse(res)
+}
+
+func separator() {
+	fmt.Println("\n----------------------------------------------------------\n")
+}
+
+func displayQuestion(resp Response) {
+	fmt.Println(resp.Message)
+
+	if resp.Rules != nil {
+		fmt.Println("\nRules:")
+		for _, res := range resp.Rules {
+			fmt.Printf("    For %d print %s\n", res.Number, res.Resp)
+		}
+	}
+
+	fmt.Println("\nExample response:", resp.Example.Answer)
+
+	if resp.Numbers != nil {
+		fmt.Println("\nNumbers:", resp.Numbers)
+	}
+
+	separator()
+}
+
+func getQuestion(url string) (Response, error) {
+	res, err := http.Get(url)
+	checkError(err)
+
+	return parseResponse(res)
+}
+
+func parseResponse(res *http.Response) (Response, error) {
+	var resp Response
+	body, err := ioutil.ReadAll(res.Body)
+
+	checkError(err)
+
+	err = json.Unmarshal(body, &resp)
+
+	checkError(err)
+
+	return resp, nil
+}
+
+func interactive(domain string, resp Response) {
+	var ans string
+	next := resp.Next
+	reader := bufio.NewReader(os.Stdin)
+
+	fmt.Println("-------------------- Starting fizzbot --------------------\n")
+	fmt.Println("Dear Candidate\n")
+	fmt.Print(resp.Message)
+	separator()
+
+	resp, err := getQuestion(domain + next)
+	checkError(err)
+	displayQuestion(resp)
+
+	for {
+		ans, err = reader.ReadString('\n')
+		checkError(err)
+		resp, err = checkAnswer(domain+next, strings.Trim(ans, "\r\n "))
+		checkError(err)
+		if strings.Trim(resp.Result, "\r\n ") == "correct" {
+			separator()
+			fmt.Println(resp.Message)
+			separator()
+			next = resp.Next
+			resp, err = getQuestion(domain + next)
+			checkError(err)
+			displayQuestion(resp)
+		} else if strings.Trim(resp.Result, "\r\n ") == "interview complete" {
+			separator()
+			fmt.Print(resp.Message)
+			separator()
+			break
+		} else {
+			fmt.Println(resp.Message)
+		}
+	}
+}
+
+func main() {
+	var resp Response
+
+	domain := "https://api.noopschallenge.com"
+	res, err := http.Get(domain + "/fizzbot")
+	checkError(err)
+	resp, err = parseResponse(res)
+	checkError(err)
+
+	interactive(domain, resp)
+}