package com.hao.chapter08;

import org.apache.flink.api.common.eventtime.SerializableTimestampAssigner;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.tuple.Tuple4;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.co.CoProcessFunction;
import org.apache.flink.util.Collector;
import org.checkerframework.checker.units.qual.A;


import java.time.Duration;

public class BillCheckExample {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);

        //来自app的日志
        SingleOutputStreamOperator<Tuple3<String, String, Long>> appStream = env.fromElements(
                Tuple3.of("order-1", "app", 1000L),
                Tuple3.of("order-2", "app", 2000L),
                Tuple3.of("order-3", "app", 3500L)
        ).assignTimestampsAndWatermarks(WatermarkStrategy.<Tuple3<String, String, Long>>forBoundedOutOfOrderness(Duration.ZERO)
                .withTimestampAssigner(new SerializableTimestampAssigner<Tuple3<String, String, Long>>() {
                    @Override
                    public long extractTimestamp(Tuple3<String, String, Long> element, long recordTimestamp) {
                        return element.f2;
                    }
                }));

        //来自第三方支付平台的支付日志
        SingleOutputStreamOperator<Tuple4<String, String, String, Long>> thirdpartStream = env.fromElements(
                Tuple4.of("order-1", "third-party", "success", 3000L),
                Tuple4.of("order-3", "third-party", "success", 4000L),
                Tuple4.of("order-4", "third-party", "success", 5000L)
        ).assignTimestampsAndWatermarks(WatermarkStrategy.<Tuple4<String, String, String, Long>>forBoundedOutOfOrderness(Duration.ZERO)
                .withTimestampAssigner(new SerializableTimestampAssigner<Tuple4<String, String, String, Long>>() {
                    @Override
                    public long extractTimestamp(Tuple4<String, String, String, Long> element, long recordTimestamp) {
                        return element.f3;
                    }
                }));

        //检测同一支付订单在两条流中的编号是否匹配,不匹配则报警
        appStream.connect(thirdpartStream)
                .keyBy(data -> data.f0, data -> data.f0)
                .process(new OrderMatchResult())
                .print();

        env.execute();

    }

    public static class OrderMatchResult extends CoProcessFunction<Tuple3<String, String, Long>,Tuple4<String, String, String, Long>,String>{

        //定义状态变量,用来保存已经到达的事件
        private ValueState<Tuple3<String, String, Long>> appEventState;
        private ValueState<Tuple4<String, String,String, Long>> thirdEventState;

        @Override
        public void open(Configuration parameters) throws Exception {
            appEventState = getRuntimeContext().getState(new ValueStateDescriptor<Tuple3<String, String, Long>>("app-event", Types.TUPLE(Types.STRING,Types.STRING,Types.LONG)));
            thirdEventState = getRuntimeContext().getState(new ValueStateDescriptor<Tuple4<String, String,String, Long>>("third-event", Types.TUPLE(Types.STRING,Types.STRING,Types.STRING,Types.LONG)));
        }

        @Override
        public void processElement1(Tuple3<String, String, Long> value, CoProcessFunction<Tuple3<String, String, Long>, Tuple4<String, String, String, Long>, String>.Context ctx, Collector<String> out) throws Exception {
            //来的是app event , 看另一条流是否来过
            if (thirdEventState.value() != null){
                out.collect("对账成功:" + value + " " + thirdEventState.value());
                //清空状态
                thirdEventState.clear();
            } else {
                //更新状态
                appEventState.update(value);
                //注册一个5s后的定时器,开始等待另一条流的事件
                ctx.timerService().registerEventTimeTimer(value.f2 + 5000L);
            }
        }

        @Override
        public void processElement2(Tuple4<String, String, String, Long> value, CoProcessFunction<Tuple3<String, String, Long>, Tuple4<String, String, String, Long>, String>.Context ctx, Collector<String> out) throws Exception {
            if (appEventState.value() != null){
                out.collect("对账成功:" + value + " " + appEventState.value());
                //清空状态
                appEventState.clear();
            } else {
                //更新状态
                thirdEventState.update(value);
                //注册一个5s后的定时器,开始等待另一条流的事件
                ctx.timerService().registerEventTimeTimer(value.f3 + 5000L);
            }
        }

        @Override
        public void onTimer(long timestamp, CoProcessFunction<Tuple3<String, String, Long>, Tuple4<String, String, String, Long>, String>.OnTimerContext ctx, Collector<String> out) throws Exception {
            //定时器触发，判断状态，如果某个状态不为空，说明另一条流中事件没来
            if (appEventState.value() != null){
                out.collect("对账失败："+ appEventState.value() + " " + "第三方支付平台未到账");
            }

            if(thirdEventState.value() != null){
                out.collect("对账失败："+ thirdEventState.value() + " " + "app平台未到账");
            }

            appEventState.clear();
            thirdEventState.clear();

        }
    }
}