import json

from pyspark.sql.types import StringType, ArrayType, StructType, StructField, DoubleType

from affro_cluster import *

from pyspark.sql import SparkSession
from pyspark.sql.functions import col, explode, first, collect_list, udf
import sys

spark = SparkSession.builder.appName("JSONProcessing").getOrCreate()

folder_path = sys.argv[1]
hdfs_output_path = sys.argv[2]

matchings_schema = ArrayType(
    StructType([
        StructField("Provenance", StringType(), nullable=True),
        StructField("PID", StringType(), nullable=True),
        StructField("Value", StringType(), nullable=True),
        StructField("Confidence", DoubleType(), nullable=True),
        StructField("Status", StringType(), nullable=True)
    ])
)

#Version of affro application on a single raw_aff_string and returns just the Matchins set
def oalex_affro(aff_string):
    try:
        matchings = affro(aff_string)
        if not isinstance(matchings, list):
            matchings = [matchings]
        return matchings
    except Exception as e:
        print(f"Error processing affiliation string {aff_string}: {str(e)}")
        return []

oalex_affro_udf = udf(oalex_affro, matchings_schema)

explode = spark.read.json(folder_path) \
    .filter(col("doi").isNotNull()) \
    .select(
        col("doi").alias("DOI"),
        col("ror").alias("OAlex"),
        explode(col("raw_aff_string")).alias("affiliation") #this allows to split all the raw_aff_string and to parallelize better
    )

affs = explode \
    .select("affiliation") \
    .distinct() \
    .withColumn("Matchings", oalex_affro_udf(col("affiliation")))


affs.join(explode, on="affiliation") \
    .select(col("DOI"),
            col("OAlex"),
            explode(col("Matchins")).alias("match")
            ) \
    .groupBy("DOI")  \
          .agg(first("OAlex").alias("OAlex"), #for each DOI it says what are the other columns Since OALEX is equal for each doi just select the first, while use the collect_list function to aggregate the Matchings
               collect_list("match").alias("Matchings") #each exploded match is collected again
               ) \
          .write \
          .mode("overwrite") \
          .option("compression","gzip") \
          .json(hdfs_output_path)