"""Aligns corpora based on the English text using Murmurhash3"""
import mmh3
import numpy as np
import polars as pl

with open("raw/europarl-v7.da-en.en") as in_file:
    texts = list(in_file)
    eng_da = pl.DataFrame(dict(text=texts, da_id=np.arange(len(texts))))
    eng_da = eng_da.select(
        pl.col("da_id"), pl.col("text").map_elements(mmh3.hash64).alias("hash")
    )
    eng_da = eng_da.select(
        pl.col("da_id"),
        # This is necessary as Polars doesn't support 128 bit integers.
        pl.col("hash").list.first().alias("hash1"),
        pl.col("hash").list.last().alias("hash2"),
    )

with open("raw/europarl-v7.sv-en.en") as in_file:
    texts = list(in_file)
    eng_sv = pl.DataFrame(dict(text=texts, sv_id=np.arange(len(texts))))
    eng_sv = eng_sv.select(
        pl.col("sv_id"), pl.col("text").map_elements(mmh3.hash64).alias("hash")
    )
    eng_sv = eng_sv.select(
        pl.col("sv_id"),
        # This is necessary as Polars doesn't support 128 bit integers.
        pl.col("hash").list.first().alias("hash1"),
        pl.col("hash").list.last().alias("hash2"),
    )

alignment = eng_sv.join(eng_da, on=["hash1", "hash2"], how="inner")
alignment = alignment.select(pl.col("da_id", "sv_id"))
alignment.write_parquet("alignment.parquet")