package mobvista.dmp.common;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import mobvista.dmp.util.MRUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.compress.GzipCodec;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.JavaType;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * author: houying
 * date  : 16-11-9
 * desc  :
 */
public class InterestDeviceDistinctMR extends CommonMapReduce {

    public static class InstallDistinctMapper extends Mapper<LongWritable, Text, Text, NullWritable> {
        private ObjectMapper objectMapper;
        private JavaType javaType;
        private Map<String, String> broadcast;
        private Text outKey = new Text();

        @Override
        protected void setup(Context context) throws IOException, InterruptedException {
            objectMapper = new ObjectMapper();
            javaType = objectMapper.getTypeFactory().constructMapType(HashMap.class, String.class, String.class);

            try {
                // 将broadcast反序列化成map对象
                Configuration conf = context.getConfiguration();
                String tag = conf.get(Constants.MR_BROADCAST_STR);
                broadcast = buildBroadcast(tag, conf, 0, 3);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

        @Override
        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
            String[] array = MRUtils.SPLITTER.split(value.toString(), -1);
            if (array.length != 4) {
                CommonMapReduce.setMetrics(context, "DMP", "column_num_error", 1);
                return;
            }

            String deviceId = array[0];
            if (checkDeviceId(deviceId)) {
                String deviceType = array[1];
                String platform = array[2];
                JsonNode appList = objectMapper.readTree(array[3]);

                List<Map<String, Object>> tagList = Lists.newArrayList();
                for (JsonNode app : appList) {
                    Map<String, String> map = objectMapper.readValue(app, javaType);
                    String date = map.get("date");
                    String packageName = map.get("package_name");
                    if ("ios".equalsIgnoreCase(platform) && packageName.matches("^id[0-9]+$")) {
                        packageName = packageName.replace("id", "");
                    }
                    String tags = broadcast.get(packageName);
                    if (tags != null) {
                        Map<String, Object> tag = Maps.newHashMap();
                        tag.put("package_name", packageName);
                        tag.put("tag", objectMapper.readValue(tags, List.class));
                        tag.put("date", date);
                        tagList.add(tag);
                    }
                }

                if (tagList.size() > 0) {
                    outKey.set(MRUtils.JOINER.join(
                            deviceId,
                            deviceType,
                            platform,
                            objectMapper.writeValueAsString(tagList)
                    ));
                    context.write(outKey, NullWritable.get());
                }
            }
        }
    }

    public static class InstallDistinctReducer extends CommonReducer {
        private ObjectMapper objectMapper = new ObjectMapper();

        @Override
        protected void reduce(Text key, Iterable<Text> values, Context context) throws IOException, InterruptedException {
            List<Map<String, Object>> appList = Lists.newArrayList();
            for (Text text : values) {
                String[] array = MRUtils.SPLITTER.split(text.toString(), -1);
                if (array.length != 3) {
                    continue;
                }
                Map<String, Object> app = Maps.newHashMap();
                app.put("package_name", array[0]);
                app.put("tag", objectMapper.readValue(array[1], List.class));
                app.put("date", array[2]);
                appList.add(app);
            }
            if (appList.size() > 0) {
                out.set(MRUtils.JOINER.join(
                        key.toString(),
                        objectMapper.writeValueAsString(appList)
                ));
                context.write(out, NullWritable.get());
            }
        }
    }

    public static void main(String[] args) throws Exception {
        start(new InterestDeviceDistinctMR(args[args.length - 1], InstallDistinctMapper.class, null), args);
    }

    public InterestDeviceDistinctMR(String name, Class<? extends Mapper> mapperClass, Class<? extends Reducer> reducerClass) {
        super(name, mapperClass, reducerClass);
    }

    @Override
    protected void otherSetting(Job job, String[] args) throws Exception {
        // 读取广播内容，用于map side join
        Configuration conf = job.getConfiguration();
        conf.set(Constants.MR_BROADCAST_STR, args[0]);
        job.setNumReduceTasks(0);
        job.setMapOutputValueClass(NullWritable.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(NullWritable.class);
        job.setInputFormatClass(TextInputFormat.class);
    }

    @Override
    protected void setOutputPath(Job job, String[] args) throws IOException {
        FileOutputFormat.setOutputPath(job, new Path(args[2]));
        FileOutputFormat.setCompressOutput(job, true);
        FileOutputFormat.setOutputCompressorClass(job, GzipCodec.class);
    }

    @Override
    protected void setInputPath(Job job, String[] args) throws IOException {
        FileInputFormat.addInputPath(job, new Path(args[1]));
    }
}