package net.i2p.router.web;

import net.i2p.data.DataHelper;
import net.i2p.router.Router;
import net.i2p.router.RouterContext;

/**
 * simple helper to control restarts/shutdowns in the left hand nav
 *
 */
public class ConfigRestartBean {
    /** all these are tagged below so no need to _x them here */
    static final String[] SET1 = {"shutdownImmediate", "Shutdown immediately", "cancelShutdown", "Cancel shutdown"};
    static final String[] SET2 = {"restartImmediate", "Restart immediately", "cancelShutdown", "Cancel restart"};
    static final String[] SET3 = {"restart", "Restart", "shutdown", "Shutdown"};
    static final String[] SET4 = {"shutdown", "Shutdown"};

    public static String getNonce() { 
        RouterContext ctx = ContextHelper.getContext(null);
        String nonce = System.getProperty("console.nonce");
        if (nonce == null) {
            nonce = ""+ctx.random().nextLong();
            System.setProperty("console.nonce", nonce);
        }
        return nonce;
    }
    public static String renderStatus(String urlBase, String action, String nonce) {
        RouterContext ctx = ContextHelper.getContext(null);
        String systemNonce = getNonce();
        if ( (nonce != null) && (systemNonce.equals(nonce)) && (action != null) ) {
            // Normal browsers send value, IE sends button label
            if ("shutdownImmediate".equals(action) || _("Shutdown immediately", ctx).equals(action)) {
                ctx.addShutdownTask(new ConfigServiceHandler.UpdateWrapperManagerTask(Router.EXIT_HARD));
                //ctx.router().shutdown(Router.EXIT_HARD); // never returns
                ctx.router().shutdownGracefully(Router.EXIT_HARD); // give the UI time to respond
            } else if ("cancelShutdown".equals(action) || _("Cancel shutdown", ctx).equals(action)) {
                ctx.router().cancelGracefulShutdown();
            } else if ("restartImmediate".equals(action) || _("Restart immediately", ctx).equals(action)) {
                ctx.addShutdownTask(new ConfigServiceHandler.UpdateWrapperManagerTask(Router.EXIT_HARD_RESTART));
                //ctx.router().shutdown(Router.EXIT_HARD_RESTART); // never returns
                ctx.router().shutdownGracefully(Router.EXIT_HARD_RESTART); // give the UI time to respond
            } else if ("restart".equals(action) || _("Restart", ctx).equals(action)) {
                ctx.addShutdownTask(new ConfigServiceHandler.UpdateWrapperManagerTask(Router.EXIT_GRACEFUL_RESTART));
                ctx.router().shutdownGracefully(Router.EXIT_GRACEFUL_RESTART);
            } else if ("shutdown".equals(action) || _("Shutdown", ctx).equals(action)) {
                ctx.addShutdownTask(new ConfigServiceHandler.UpdateWrapperManagerTask(Router.EXIT_GRACEFUL));
                ctx.router().shutdownGracefully();
            }
        }
        
        boolean shuttingDown = isShuttingDown(ctx);
        boolean restarting = isRestarting(ctx);
        long timeRemaining = ctx.router().getShutdownTimeRemaining();
        StringBuilder buf = new StringBuilder(128);
        if ((shuttingDown || restarting) && timeRemaining <= 0) {
            buf.append("<center><b>").append(_("Shutdown imminent", ctx)).append("</b></center>");
        } else if (shuttingDown) {
            buf.append("<center><b>");
            buf.append(_("Shutdown in {0}", DataHelper.formatDuration(timeRemaining), ctx));
            buf.append("</b></center><br>");
            buttons(ctx, buf, urlBase, systemNonce, SET1);
        } else if (restarting) {
            buf.append("<center><b>");
            buf.append(_("Restart in {0}", DataHelper.formatDuration(timeRemaining), ctx));
            buf.append("</b></center><br>");
            buttons(ctx, buf, urlBase, systemNonce, SET2);
        } else {
            if (System.getProperty("wrapper.version") != null)
                buttons(ctx, buf, urlBase, systemNonce, SET3);
            else
                buttons(ctx, buf, urlBase, systemNonce, SET4);
        }
        return buf.toString();
    }
    
    /** @param s value,label,... pairs */
    private static void buttons(RouterContext ctx, StringBuilder buf, String url, String nonce, String[] s) {
        buf.append("<form action=\"").append(url).append("\" method=\"GET\">\n");
        buf.append("<input type=\"hidden\" name=\"consoleNonce\" value=\"").append(nonce).append("\" >\n");
        for (int i = 0; i < s.length; i+= 2)
            buf.append("<button type=\"submit\" name=\"action\" value=\"").append(s[i]).append("\" >").append(_(s[i+1], ctx)).append("</button>\n");
        buf.append("</form>\n");
    }

    private static boolean isShuttingDown(RouterContext ctx) {
        return Router.EXIT_GRACEFUL == ctx.router().scheduledGracefulExitCode() ||
               Router.EXIT_HARD == ctx.router().scheduledGracefulExitCode();
    }
    private static boolean isRestarting(RouterContext ctx) {
        return Router.EXIT_GRACEFUL_RESTART == ctx.router().scheduledGracefulExitCode() ||
               Router.EXIT_HARD_RESTART == ctx.router().scheduledGracefulExitCode();
    }
    /** this is for summaryframe.jsp */
    public static long getRestartTimeRemaining() {
        RouterContext ctx = ContextHelper.getContext(null);
        if (ctx.router().gracefulShutdownInProgress())
            return ctx.router().getShutdownTimeRemaining();
        return Long.MAX_VALUE/2;  // summaryframe.jsp adds a safety factor so we don't want to overflow...
    }

    private static String _(String s, RouterContext ctx) {
        return Messages.getString(s, ctx);
    }

    private static String _(String s, Object o, RouterContext ctx) {
        return Messages.getString(s, o, ctx);
    }
}