import argparse
import os
import sys
import textwrap

import pandas as pd


def get_field(csv, model_name: str, field: str):
    try:
        return csv.loc[csv["name"] == model_name][field].item()
    except Exception as e:
        return None


def check_accuracy(actual_csv, expected_csv, expected_filename):
    failed = []
    improved = []

    for model in actual_csv["name"]:
        accuracy = get_field(actual_csv, model, "accuracy")
        expected_accuracy = get_field(expected_csv, model, "accuracy")

        if accuracy == expected_accuracy:
            status = "PASS" if expected_accuracy == "pass" else "XFAIL"
            print(f"{model:34}  {status}")
            continue
        elif accuracy != "pass":
            status = "FAIL:"
            failed.append(model)
        else:
            status = "IMPROVED:"
            improved.append(model)
        print(
            f"{model:34}  {status:9} accuracy={accuracy}, expected={expected_accuracy}"
        )

    msg = ""
    if failed or improved:
        if failed:
            msg += textwrap.dedent(
                f"""
            Error: {len(failed)} models have accuracy status regressed:
                {' '.join(failed)}

            """
            )
        if improved:
            msg += textwrap.dedent(
                f"""
            Improvement: {len(improved)} models have accuracy status improved:
                {' '.join(improved)}

            """
            )
        sha = os.getenv("SHA1", "{your CI commit sha}")
        msg += textwrap.dedent(
            f"""
        If this change is expected, you can update `{expected_filename}` to reflect the new baseline.
        from pytorch/pytorch root, run
        `python benchmarks/dynamo/ci_expected_accuracy/update_expected.py {sha}`
        and then `git add` the resulting local changes to expected CSVs to your commit.
        """
        )
    return failed or improved, msg


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--actual", type=str, required=True)
    parser.add_argument("--expected", type=str, required=True)
    args = parser.parse_args()

    actual = pd.read_csv(args.actual)
    expected = pd.read_csv(args.expected)

    failed, msg = check_accuracy(actual, expected, args.expected)
    if failed:
        print(msg)
        sys.exit(1)


if __name__ == "__main__":
    main()