package main

import (
	"fmt"
	"io"
	"regexp"
	"strings"
)

func cleanInput(input string) []string {
	normalized := strings.ToLower(input)
	trimmed := strings.TrimSpace(normalized)

	re := regexp.MustCompile(`[\s]+`)

	words := re.Split(trimmed, -1)
	return words
}

type inputScanner interface {
	Scan() bool
	Err() error
	Text() string
}

func runREPL(s inputScanner, w io.Writer, sanitizer func(string) []string) {
	context := NewContext()

	for {
		fmt.Fprint(w, "Pokedex > ")

		s.Scan()
		err := s.Err()

		if err != nil {
			fmt.Fprintf(w, "Pokedex > Sorry I didn't get that.\n")
			continue
		}

		input := s.Text()

		if input == "" {
			break
		}

		cleanedInput := sanitizer(input)

		if len(cleanedInput) < 1 {
			fmt.Fprintf(w, "Pokedex > Sorry I couldn't understand that.\n")
			continue
		}

		requestedCommand := cleanedInput[0]
		command, exists := context.commands[requestedCommand]

		if !exists {
			fmt.Fprintln(w, "Unknown command")
			continue
		}

		err = command.callback(context)

		if err != nil {
			fmt.Fprintf(w, "Pokedex > Error occurred executing command: %s", err)
		}
	}
}