#!/usr/bin/env python
import scanpy as sc, anndata as ad, pandas as pd
from pathlib import Path
import argparse


def read_samplesheet(samplesheet):
    df = pd.read_csv(samplesheet)
    df.set_index("sample")

    # samplesheet may contain replicates, when it has,
    # group information from replicates and collapse with commas
    # only keep unique values using set()
    df = df.groupby(["sample"]).agg(lambda column: ",".join(set(column)))

    return df


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Concatenates h5ad files and merge metadata from samplesheet")

    parser.add_argument("-i", "--input", dest="input", help="Path to samplesheet.csv")
    parser.add_argument("-o", "--out", dest="out", help="Output path.")
    parser.add_argument(
        "-s",
        "--suffix",
        dest="suffix",
        help="Suffix of matrices to remove and get sample name",
    )

    args = vars(parser.parse_args())

    # Open samplesheet as dataframe
    df_samplesheet = read_samplesheet(args["input"])

    # find all h5ad and append to dict
    dict_of_h5ad = {str(path).replace(args["suffix"], ""): sc.read_h5ad(path) for path in Path(".").rglob("*.h5ad")}

    # concat h5ad files
    adata = ad.concat(dict_of_h5ad, label="sample", merge="unique", index_unique="_")

    # merge with data.frame, on sample information
    adata.obs = adata.obs.join(df_samplesheet, on="sample")
    adata.write_h5ad(args["out"], compression="gzip")

    print("Wrote h5ad file to {}".format(args["out"]))
