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package com.devops4j.embedded.httpserver.impl;

import java.security.PrivilegedAction;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Parameters that users will not likely need to set
 * but are useful for debugging
 */

class ServerConfig {

    private static final int DEFAULT_CLOCK_TICK = 10000 ; // 10 sec.

    /* These values must be a reasonable multiple of clockTick */
    private static final long DEFAULT_IDLE_INTERVAL = 30 ; // 5 min
    private static final int DEFAULT_MAX_IDLE_CONNECTIONS = 200 ;

    private static final long DEFAULT_MAX_REQ_TIME = -1; // default: forever
    private static final long DEFAULT_MAX_RSP_TIME = -1; // default: forever
    private static final long DEFAULT_TIMER_MILLIS = 1000;
    private static final int  DEFAULT_MAX_REQ_HEADERS = 200;
    private static final long DEFAULT_DRAIN_AMOUNT = 64 * 1024;

    private static int clockTick;
    private static long idleInterval;
    // The maximum number of bytes to drain from an inputstream
    private static long drainAmount;
    private static int maxIdleConnections;
    // The maximum number of request headers allowable
    private static int maxReqHeaders;
    // max time a request or response is allowed to take
    private static long maxReqTime;
    private static long maxRspTime;
    private static long timerMillis;
    private static boolean debug;

    // the value of the TCP_NODELAY socket-level option
    private static boolean noDelay;

    static {
        java.security.AccessController.doPrivileged(
            new PrivilegedAction() {
                @Override
                public Void run () {
                    idleInterval = Long.getLong("sun.net.httpserver.idleInterval",
                            DEFAULT_IDLE_INTERVAL) * 1000;

                    clockTick = Integer.getInteger("sun.net.httpserver.clockTick",
                            DEFAULT_CLOCK_TICK);

                    maxIdleConnections = Integer.getInteger(
                            "sun.net.httpserver.maxIdleConnections",
                            DEFAULT_MAX_IDLE_CONNECTIONS);

                    drainAmount = Long.getLong("sun.net.httpserver.drainAmount",
                            DEFAULT_DRAIN_AMOUNT);

                    maxReqHeaders = Integer.getInteger(
                            "sun.net.httpserver.maxReqHeaders",
                            DEFAULT_MAX_REQ_HEADERS);

                    maxReqTime = Long.getLong("sun.net.httpserver.maxReqTime",
                            DEFAULT_MAX_REQ_TIME);

                    maxRspTime = Long.getLong("sun.net.httpserver.maxRspTime",
                            DEFAULT_MAX_RSP_TIME);

                    timerMillis = Long.getLong("sun.net.httpserver.timerMillis",
                            DEFAULT_TIMER_MILLIS);

                    debug = Boolean.getBoolean("sun.net.httpserver.debug");

                    noDelay = Boolean.getBoolean("sun.net.httpserver.nodelay");

                    return null;
                }
            });

    }

    static void checkLegacyProperties(final Logger logger) {

        // legacy properties that are no longer used
        // print a warning to logger if they are set.

        java.security.AccessController.doPrivileged(
            new PrivilegedAction() {
                public Void run () {
                    if (System.getProperty("sun.net.httpserver.readTimeout")
                                                !=null)
                    {
                        logger.log (Level.WARNING,
                            "sun.net.httpserver.readTimeout "+
                            "property is no longer used. "+
                            "Use sun.net.httpserver.maxReqTime instead."
                        );
                    }
                    if (System.getProperty("sun.net.httpserver.writeTimeout")
                                                !=null)
                    {
                        logger.log (Level.WARNING,
                            "sun.net.httpserver.writeTimeout "+
                            "property is no longer used. Use "+
                            "sun.net.httpserver.maxRspTime instead."
                        );
                    }
                    if (System.getProperty("sun.net.httpserver.selCacheTimeout")
                                                !=null)
                    {
                        logger.log (Level.WARNING,
                            "sun.net.httpserver.selCacheTimeout "+
                            "property is no longer used."
                        );
                    }
                    return null;
                }
            }
        );
    }

    static boolean debugEnabled() {
        return debug;
    }

    static long getIdleInterval() {
        return idleInterval;
    }

    static int getClockTick() {
        return clockTick;
    }

    static int getMaxIdleConnections() {
        return maxIdleConnections;
    }

    static long getDrainAmount() {
        return drainAmount;
    }

    static int getMaxReqHeaders() {
        return maxReqHeaders;
    }

    static long getMaxReqTime() {
        return maxReqTime;
    }

    static long getMaxRspTime() {
        return maxRspTime;
    }

    static long getTimerMillis() {
        return timerMillis;
    }

    static boolean noDelay() {
        return noDelay;
    }
}