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package com.alibaba.jvm.sandbox.module.debug;

import com.alibaba.jvm.sandbox.api.Information;
import com.alibaba.jvm.sandbox.api.Module;
import com.alibaba.jvm.sandbox.api.http.Http;
import com.alibaba.jvm.sandbox.api.http.printer.ConcurrentLinkedQueuePrinter;
import com.alibaba.jvm.sandbox.api.http.printer.Printer;
import com.alibaba.jvm.sandbox.api.listener.ext.Advice;
import com.alibaba.jvm.sandbox.api.listener.ext.AdviceListener;
import com.alibaba.jvm.sandbox.api.listener.ext.EventWatchBuilder;
import com.alibaba.jvm.sandbox.api.listener.ext.EventWatcher;
import com.alibaba.jvm.sandbox.api.resource.ModuleEventWatcher;
import com.alibaba.jvm.sandbox.module.debug.util.Express;
import org.apache.commons.lang3.EnumUtils;
import org.kohsuke.MetaInfServices;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;

import static com.alibaba.jvm.sandbox.module.debug.DebugWatchModule.Trigger.*;

/**
 * 模仿Greys的watch命令
 * 测试用模块
 *
 * @author [email protected]
 */
@MetaInfServices(Module.class)
@Information(id = "debug-watch", version = "0.0.1", author = "[email protected]")
public class DebugWatchModule extends HttpSupported implements Module {

    @Resource
    private ModuleEventWatcher moduleEventWatcher;

    @Http("/watch")
    public void watch(final HttpServletRequest req,
                      final HttpServletResponse resp) throws IOException {
        try {
            final String cnPattern = getParameter(req, "class");
            final String mnPattern = getParameter(req, "method");
            final String watchExpress = getParameter(req, "watch");
            final List triggers = getParameters(
                    req,
                    "at",
                    new Converter() {
                        @Override
                        public Trigger convert(String string) {
                            return EnumUtils.getEnum(Trigger.class, string);
                        }
                    },
                    new Trigger[]{Trigger.BEFORE});
            final Printer printer = new ConcurrentLinkedQueuePrinter(resp.getWriter());
            debugWatch(cnPattern, mnPattern, watchExpress, triggers, printer);
        } catch (HttpSupported.HttpErrorCodeException hece) {
            resp.sendError(hece.getCode(), hece.getMessage());
            return;
        }
    }


    private void debugWatch(final String cnPattern,
                            final String mnPattern,
                            final String watchExpress,
                            final List triggers,
                            final Printer printer) {
        final EventWatcher watcher = new EventWatchBuilder(moduleEventWatcher)
                .onClass(cnPattern).includeSubClasses()
                .onBehavior(mnPattern)
                .onWatching().withProgress(new ProgressPrinter(printer))
                .onWatch(new AdviceListener() {

                    @Override
                    public void before(final Advice advice) {
                        if (!triggers.contains(BEFORE)) {
                            return;
                        }
                        printlnByExpress(binding(advice));
                    }

                    @Override
                    public void afterReturning(final Advice advice) {
                        if (!triggers.contains(RETURN)) {
                            return;
                        }
                        printlnByExpress(
                                binding(advice)
                                        .bind("return", advice.getReturnObj())
                        );
                    }

                    @Override
                    public void afterThrowing(final Advice advice) {
                        if (!triggers.contains(THROWS)) {
                            return;
                        }
                        printlnByExpress(
                                binding(advice)
                                        .bind("throws", advice.getThrowable())
                        );
                    }

                    private Bind binding(Advice advice) {
                        return new Bind()
                                .bind("class", advice.getBehavior().getDeclaringClass())
                                .bind("method", advice.getBehavior())
                                .bind("params", advice.getParameterArray())
                                .bind("target", advice.getTarget());
                    }

                    private void printlnByExpress(final Bind bind) {
                        try {
                            final Object watchObject = Express.ExpressFactory.newExpress(bind).get(watchExpress);
                            printer.println(DebugWatchModule.toString(watchObject));
                        } catch (Express.ExpressException e) {
                            printer.println(String.format("express: %s was wrong! msg:%s.", watchExpress, e.getMessage()));
                        }

                    }

                });
        try {
            printer.println(String.format(
                    "watching on [%s#%s], at %s, watch:%s.\nPress CTRL_C about it!",
                    cnPattern,
                    mnPattern,
                    triggers,
                    watchExpress
            ));
            printer.waitingForBroken();
        } finally {
            watcher.onUnWatched();
        }

    }

    private static String toString(final Object object) {
        return null == object
                ? "null"
                : object.toString();
    }

    /**
     * 观察触点
     */
    enum Trigger {
        BEFORE,
        RETURN,
        THROWS
    }

    class Bind extends HashMap {
        Bind bind(final String name,
                  final Object value) {
            put(name, value);
            return this;
        }
    }

}