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package main

import (
	"bufio"
	"fmt"
	"math/rand"
	"os"
	"time"
)

const Debug bool = true
var stdin *bufio.Reader

func main() {
	var guess int
	var trial uint
	
	answer := GenRandNumber()

	// Ask guess initially
	guess = UserInput()

	for trial = 1; guess != answer; trial++ {
		if guess > answer {
			fmt.Println("Your number is greater than the answer.")
		} else {
			fmt.Println("Your number is lesser than the answer.")
		}

		if guess < 0 || guess >= 100 {
			fmt.Println("Hint: answer is a number in range from 0 to 99")
		}

		// Ask your guess again
		guess = UserInput()
	}

	fmt.Println("Correct, congratulation!")
	fmt.Printf("Tried %d times", trial)
}

func init() {
	// Configure random seed
	rand.Seed(time.Now().UnixNano())
	stdin = bufio.NewReader(os.Stdin)
}

func GenRandNumber() int {
	// Generate random number from 0 to 99
	answer := rand.Intn(100)

	// For debugging condition, print answer first
	if Debug {
		fmt.Println("Answer is :", answer)
	}

	return answer
}

func UserInput() int {
	var n int

	for {
		fmt.Print("Write your guess: ")
		_, err := fmt.Scanln(&n)
		if err != nil {
			stdin.ReadString('\n')
			fmt.Println("Please write only numbers!")
		} else {
			return n
		}
	}
}