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feedback.go
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feedback.go
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package main
import (
"bufio"
"fmt"
"log"
)
type FeedbackColour uint8
const (
GREY FeedbackColour = iota
YELLOW
GREEN
)
type Feedback [wordLength]FeedbackColour
func (f *Feedback) Success() bool {
for _, colour := range f {
if colour != GREEN {
return false
}
}
return true
}
type FeedbackResolver interface {
Resolve(guess Word, attempt int) Feedback
}
type InteractiveFeedbackResolver struct {
Logger *log.Logger
Scanner *bufio.Scanner
}
func (r *InteractiveFeedbackResolver) Resolve(guess Word, attempt int) Feedback {
r.Logger.Printf("Guess #%d: %s", attempt, guess)
r.Logger.Print("Enter feedback (Grey = 0, Yellow = 1, Green = 2):")
for {
r.Scanner.Scan()
feedback, err := r.parseFeedback(r.Scanner.Bytes())
if err != nil {
r.Logger.Printf("Feedback validation failed: %s", err)
r.Logger.Print("Please try again (e.g. 21012):")
continue
}
return feedback
}
}
func (r *InteractiveFeedbackResolver) parseFeedback(data []byte) (Feedback, error) {
feedback := Feedback{GREY, GREY, GREY, GREY, GREY}
if len(data) != 5 {
return feedback, fmt.Errorf("invalid length")
}
for i := 0; i < wordLength; i++ {
char := data[i]
switch char {
case '2':
feedback[i] = GREEN
case '1':
feedback[i] = YELLOW
case '0':
// Do nothing
default:
return feedback, fmt.Errorf("invalid character '%c'", char)
}
}
return feedback, nil
}
type SimulationFeedbackResolver struct {
Answer Word
}
func (r *SimulationFeedbackResolver) Resolve(guess Word, _ int) Feedback {
return buildFeedback(guess, r.Answer)
}
func buildFeedback(guess, answer Word) Feedback {
feedback := Feedback{GREY, GREY, GREY, GREY, GREY}
answerChars := map[byte]int{}
greenChars := map[byte]int{}
yellowChars := map[byte]int{}
for i := 0; i < wordLength; i++ {
answerChars[answer[i]]++
if guess[i] == answer[i] {
feedback[i] = GREEN
greenChars[guess[i]]++
}
}
for i := 0; i < wordLength; i++ {
if feedback[i] == GREEN {
continue
}
// The character is present in the answer, and it's not been seen as many times as it occurs
if answerChars[guess[i]] > 0 && yellowChars[guess[i]] < answerChars[guess[i]]-greenChars[guess[i]] {
feedback[i] = YELLOW
yellowChars[guess[i]]++
}
}
return feedback
}