package com.fr.plugin.pack.http;

import com.finebi.activate.foundation.StableManager;
import com.finebi.base.concurrent.DefaultThreadFactory;
import com.finebi.common.api.vo.table.parameter.Parameters;
import com.finebi.dashboard.api.bean.widget.WidgetBean;
import com.finebi.dashboard.api.service.FineDashBoardService;
import com.finebi.dashboard.api.service.FineWidgetExecutorService;
import com.finebi.dashboard.api.structure.result.preview.BIPreViewResult;
import com.finebi.dashboard.impl.helper.FineDashBoardUtils;
import com.finebi.foundation.api.reponse.FineRespond;
import com.finebi.foundation.api.service.FineService;
import com.finebi.selector.api.DirectSourceEngineFactory;
import com.finebi.utils.CollectionUtils;
import com.finebi.utils.StringUtils;
import com.finebi.web.action.v5.BaseAction;
import com.fr.decision.authority.data.User;
import com.fr.decision.fun.impl.BaseHttpHandler;
import com.fr.general.IOUtils;
import com.fr.invoke.Reflect;
import com.fr.log.FineLoggerFactory;
import com.fr.plugin.pack.bean.WidgetsBean;
import com.fr.plugin.pack.conf.PackPluginConfig;
import com.fr.plugin.pack.exception.ReportExceedException;
import com.fr.plugin.pack.exception.WidgetExceedException;
import com.fr.plugin.pack.source.PackDBSourceEngine;
import com.fr.plugin.pack.traffic.PackTraffic;
import com.fr.plugin.pack.traffic.PackTrafficFactory;
import com.fr.third.fasterxml.jackson.databind.ObjectMapper;
import com.fr.third.springframework.web.bind.annotation.RequestMethod;
import com.fr.web.utils.WebUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.stream.Collectors;

/**
 * @author Jonas
 * @version 5.1.3
 * Created by Jonas on 2020-10-19
 */
public class PackHttpHandler extends BaseHttpHandler {
    private PackTraffic reportTraffic = PackTrafficFactory.getReportTraffic();
    public static String PATH = "/widgets/data";
    private ExecutorService executorService = Executors.newCachedThreadPool(new DefaultThreadFactory("pack-widget-execute"));

    {
        DirectSourceEngineFactory.INSTANCE.register(new PackDBSourceEngine());
    }

    @Override
    public RequestMethod getMethod() {
        return RequestMethod.POST;
    }

    @Override
    public String getPath() {
        return PATH;
    }

    @Override
    public boolean isPublic() {
        return false;
    }

    @Override
    public void handle(HttpServletRequest request, HttpServletResponse response) throws Exception {
        ObjectMapper mapper = new ObjectMapper();
        String reportId = null;
        try {
            String body = IOUtils.inputStream2String(request.getInputStream());
            WidgetsBean widgetsBean = mapper.readValue(body, WidgetsBean.class);

            Map<String, Object> result = new HashMap<>();
            Set<String> reportIds = widgetsBean.getWidgets().values().stream().map(WidgetBean::getReportId).collect(Collectors.toSet());
            if (CollectionUtils.isEmpty(reportIds)) {
                throw new UnsupportedOperationException();
            } else {
                reportId = reportIds.iterator().next();
                if (StringUtils.isEmpty(reportId)) {
                    throw new UnsupportedOperationException("reportId must be not emtpy");
                }
            }
            if (!reportTraffic.offer(reportId)) {
                throw new ReportExceedException();
            }
            try {
                List<Future<?>> futures = new ArrayList<>();
                for (Map.Entry<String, WidgetBean> entry : widgetsBean.getWidgets().entrySet()) {
                    WidgetBean widgetBean = entry.getValue();
                    User user = FineDashBoardUtils.getUserFromReq(request, widgetBean.getReportId());
                    boolean mobile = FineDashBoardUtils.isMobile(request);
                    Parameters parameterFromRequest = FineDashBoardUtils.getParameterFromRequest(request);
                    String widgetId = entry.getKey();
                    Future<?> future = executorService.submit(() -> {
                        try {
                            BIPreViewResult widgetData = Reflect.on(FineDashBoardUtils.class)
                                    .call("getWidgetData", widgetBean, user, mobile, parameterFromRequest,
                                            getBean(FineDashBoardService.class), getBean(FineWidgetExecutorService.class))
                                    .get();
                            result.put(widgetId, FineRespond.success(widgetData));
                        } catch (Exception e) {
                            FineLoggerFactory.getLogger().debug(e.getMessage(), e);
                            result.put(widgetId, handleException(e));
                        }
                    });
                    futures.add(future);
                }
                for (Future<?> future : futures) {
                    try {
                        // 设置超时时间，不能一直在等着
                        future.get(PackPluginConfig.getInstance().getWidgetQueryTimeout(), TimeUnit.MILLISECONDS);
                    } catch (TimeoutException e) {
                        future.cancel(true);
                    }
                }
                WebUtils.printAsString(response, mapper.writeValueAsString(FineRespond.success(result)));
            } finally {
                reportTraffic.release(reportId);
            }
        } catch (Exception e) {
            e.printStackTrace();
            WebUtils.printAsString(response, mapper.writeValueAsString(FineRespond.fail("500", mapper.writeValueAsString(handleException(e)))));
        }
    }

    private static FineRespond handleException(Exception e) {
        if (e instanceof ReportExceedException) {
            return FineRespond.fail(((ReportExceedException) e).errorCode(), e.getMessage());
        }
        if (e instanceof WidgetExceedException) {
            return FineRespond.fail(((WidgetExceedException) e).errorCode(), e.getMessage());
        }
        return Reflect.on(BaseAction.class).call("getExceptionRespond", e).get();
    }

    private static <T extends FineService> T getBean(Class<T> annotatedClass) {
        return StableManager.getContext().getServiceBean(annotatedClass);
    }
}