package org.gingercal.net;

import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;

/**
 * In-memory diagnostics log (last few hundred lines): every request with its status and timing,
 * sign-in steps, stream attempts. Viewable in the app and savable to the SD card, so a problem
 * on a real server can be reported precisely. Tokens are never logged.
 */
public final class DiagLog {
    private static final int MAX = 400;
    private static final List<String> lines = new ArrayList<String>();
    private static final SimpleDateFormat fmt = new SimpleDateFormat("HH:mm:ss", Locale.US);

    private DiagLog() {}

    public static void log(String msg) {
        String line;
        synchronized (fmt) { line = fmt.format(new Date()) + " " + msg; }
        synchronized (lines) {
            lines.add(line);
            if (lines.size() > MAX) lines.remove(0);
        }
    }

    public static String dump() {
        StringBuilder sb = new StringBuilder();
        synchronized (lines) {
            for (int i = 0; i < lines.size(); i++) sb.append(lines.get(i)).append('\n');
        }
        return sb.toString();
    }

    public static void clear() {
        synchronized (lines) { lines.clear(); }
    }

    /** URL without the token value, safe to show and share. */
    public static String redact(String url) {
        if (url == null) return "";
        return url.replaceAll("((?:X-Plex-Token|token|T|Passwd)=)[^&]*", "$1***");
    }
}