package com.fireflysource.net.websocket.common.model;

import java.nio.charset.StandardCharsets;

public class CloseStatus {
    private static final int MAX_CONTROL_PAYLOAD = 125;
    public static final int MAX_REASON_PHRASE = MAX_CONTROL_PAYLOAD - 2;

    /**
     * Convenience method for trimming a long reason phrase at the maximum reason phrase length of 123 UTF-8 bytes (per WebSocket spec).
     *
     * @param reason the proposed reason phrase
     * @return the reason phrase (trimmed if needed)
     * @deprecated use of this method is strongly discouraged, as it creates too many new objects that are just thrown away to accomplish its goals.
     */
    @Deprecated
    public static String trimMaxReasonLength(String reason) {
        if (reason == null) {
            return null;
        }

        byte[] reasonBytes = reason.getBytes(StandardCharsets.UTF_8);
        if (reasonBytes.length > MAX_REASON_PHRASE) {
            byte[] trimmed = new byte[MAX_REASON_PHRASE];
            System.arraycopy(reasonBytes, 0, trimmed, 0, MAX_REASON_PHRASE);
            return new String(trimmed, StandardCharsets.UTF_8);
        }

        return reason;
    }

    private int code;
    private String phrase;

    /**
     * Creates a reason for closing a web socket connection with the given code and reason phrase.
     *
     * @param closeCode    the close code
     * @param reasonPhrase the reason phrase
     * @see StatusCode
     */
    public CloseStatus(int closeCode, String reasonPhrase) {
        this.code = closeCode;
        this.phrase = reasonPhrase;
        if (reasonPhrase.length() > MAX_REASON_PHRASE) {
            throw new IllegalArgumentException("Phrase exceeds maximum length of " + MAX_REASON_PHRASE);
        }
    }

    public int getCode() {
        return code;
    }

    public String getPhrase() {
        return phrase;
    }
}
