@Getter
@RequiredArgsConstructor
@AllArgsConstructor
public class Placeholder<T> {

    private String placeholder;
    private final Function<T, String> replacement;

    @Setter
    private boolean expensiveLookup = false;
    @Setter
    private boolean cacheValue = false;

    private String cachedValue;

    public Placeholder(String placeholder, Function<T, String> replacement) {
        this.placeholder = placeholder;
        this.replacement = replacement;
    }

    public Placeholder(String placeholder, String replacement) {
        this(placeholder, (object) -> replacement);
    }


    public String replace(String text, T object) {
        if(!placeholder.startsWith("%"))
            placeholder = "%" + placeholder;
        if(!placeholder.endsWith("%"))
            placeholder = placeholder + "%";

        if(cacheValue && cachedValue != null) {
            return text.replace(placeholder, cachedValue);
        }

        if(expensiveLookup) {
            int substringIndex = text.indexOf(placeholder);

            while(substringIndex != -1) {
                String before = text.substring(0, substringIndex);
                String after = text.substring(substringIndex + placeholder.length());

                text = before + replace(object) + after;

                substringIndex = text.indexOf(placeholder);
            }

            tryCache(text);

            return text;
        }

        String value = replace(object);

        tryCache(value);

        return text.replace(placeholder, value);
    }

    private String replace(T object) {
        return replacement.apply(object);
    }

    private void tryCache(String value) {
        if(cacheValue) {
            cachedValue = value;
        }
    }
}