package main

import (
	"fmt"
	"os"
	"strconv"

	"github.com/mattn/go-tty"
)

func numberPrompt(tty *tty.TTY, prompt string, opts []string) (int, error) {
	fmt.Println()
	fmt.Println(prompt)
	fmt.Println("(pick an option using the corresponding number)")

	chosen := -1
	for chosen < 0 {
		fmt.Println()
		for ix, o := range opts {
			fmt.Printf("%d: %s\n", ix+1, o)
		}
		r, err := tty.ReadRune()
		if err != nil {
			return -1, fmt.Errorf("could not collect answer for '%s': %w", prompt, err)
		}
		c, err := strconv.Atoi(string(r))
		if err != nil {
			fmt.Println()
			fmt.Printf("I could not understand '%s'. Try again, please.\n", string(r))
			continue
		}
		if c > len(opts) || c == 0 {
			fmt.Println()
			fmt.Printf("%s is not an option. Try again, please.\n", string(r))
			continue
		}
		chosen = c - 1
	}

	return chosen, nil
}

func _main() error {
	fmt.Println("Hi, you have reached the tilde town help desk.")
	fmt.Println()
	fmt.Println("Please check out the options below. If none of them apply to you, you can send an e-mail to root@tilde.town .")
	tty, err := tty.Open()
	if err != nil {
		return fmt.Errorf("could not open tty: %w", err)
	}
	defer tty.Close()

	options := []string{
		"I lost access to my tilde.town account and want to upload a new SSH key",
		"I have a code from my e-mail to redeem",
		"I just want outta here",
	}
	c, err := numberPrompt(tty, "What do you need help with?", options)

	if c == 2 {
		fmt.Println()
		fmt.Println("bye~")
		return nil
	}

	// TODO collect email

	return nil
}

func main() {
	err := _main()
	if err != nil {
		fmt.Printf("sorry, something went wrong: %s\n", err.Error())
		fmt.Println("Please let an admin know by emailing a copy of this error to root@tilde.town")
		os.Exit(1)
	}
}