"""TOSA result checker script."""
# Copyright (c) 2020-2022, ARM Limited.
# SPDX-License-Identifier: Apache-2.0
import argparse
import os
from enum import Enum
from enum import IntEnum
from enum import unique
from pathlib import Path

import numpy as np

##################################
no_color_printing = False


@unique
class LogColors(Enum):
    """Shell escape sequence colors for logging."""

    NONE = "\u001b[0m"
    GREEN = "\u001b[32;1m"
    RED = "\u001b[31;1m"
    YELLOW = "\u001b[33;1m"
    BOLD_WHITE = "\u001b[1m"


def print_color(color, msg):
    """Print color status messages if enabled."""
    if no_color_printing:
        print(msg)
    else:
        print("{}{}{}".format(color.value, msg, LogColors.NONE.value))


@unique
class TestResult(IntEnum):
    """Test result values."""

    # Note: PASS must be 0 for command line return success
    PASS = 0
    MISSING_FILE = 1
    INCORRECT_FORMAT = 2
    MISMATCH = 3
    INTERNAL_ERROR = 4


TestResultErrorStr = [
    "",
    "Missing file",
    "Incorrect format",
    "Mismatch",
    "Internal error",
]
##################################


def test_check(
    reference, result, test_name="test", quantize_tolerance=0, float_tolerance=1e-3
):
    """Check if the result is the same as the expected reference."""
    if not os.path.isfile(reference):
        print_color(LogColors.RED, "Reference MISSING FILE {}".format(test_name))
        msg = "Missing reference file: {}".format(reference)
        return (TestResult.MISSING_FILE, 0.0, msg)
    if not os.path.isfile(result):
        print_color(LogColors.RED, "Results MISSING FILE {}".format(test_name))
        msg = "Missing result file: {}".format(result)
        return (TestResult.MISSING_FILE, 0.0, msg)

    try:
        test_result = np.load(result)
    except Exception as e:
        print_color(LogColors.RED, "Results INCORRECT FORMAT {}".format(test_name))
        msg = "Incorrect numpy format of {}\nnumpy.load exception: {}".format(result, e)
        return (TestResult.INCORRECT_FORMAT, 0.0, msg)
    try:
        reference_result = np.load(reference)
    except Exception as e:
        print_color(LogColors.RED, "Reference INCORRECT FORMAT {}".format(test_name))
        msg = "Incorrect numpy format of {}\nnumpy.load exception: {}".format(
            reference, e
        )
        return (TestResult.INCORRECT_FORMAT, 0.0, msg)

    # Type comparison
    if test_result.dtype != reference_result.dtype:
        print_color(LogColors.RED, "Results TYPE MISMATCH {}".format(test_name))
        msg = "Mismatch results type: Expected {}, got {}".format(
            reference_result.dtype, test_result.dtype
        )
        return (TestResult.MISMATCH, 0.0, msg)

    # Size comparison
    # Size = 1 tensors can be equivalently represented as having rank 0 or rank
    # >= 0, allow that special case
    test_result = np.squeeze(test_result)
    reference_result = np.squeeze(reference_result)

    if np.shape(test_result) != np.shape(reference_result):
        print_color(LogColors.RED, "Results MISCOMPARE {}".format(test_name))
        msg = "Shapes mismatch: Reference {} vs {}".format(
            np.shape(test_result), np.shape(reference_result)
        )
        return (TestResult.MISMATCH, 0.0, msg)

    # for quantized test, allow +-(quantize_tolerance) error
    if reference_result.dtype == np.int32 or reference_result.dtype == np.int64:

        if np.all(np.absolute(reference_result - test_result) <= quantize_tolerance):
            print_color(LogColors.GREEN, "Results PASS {}".format(test_name))
            return (TestResult.PASS, 0.0, "")
        else:
            tolerance = quantize_tolerance + 1
            while not np.all(
                np.absolute(reference_result - test_result) <= quantize_tolerance
            ):
                tolerance = tolerance + 1
                if tolerance > 10:
                    break

            if tolerance > 10:
                msg = "Integer result does not match and is greater than 10 difference"
            else:
                msg = (
                    "Integer result does not match but is within {} difference".format(
                        tolerance
                    )
                )
            # Fall-through to below to add failure values

    elif reference_result.dtype == bool:
        assert test_result.dtype == bool
        # All boolean values must match, xor will show up differences
        test = np.array_equal(reference_result, test_result)
        if np.all(test):
            print_color(LogColors.GREEN, "Results PASS {}".format(test_name))
            return (TestResult.PASS, 0.0, "")
        msg = "Boolean result does not match"
        tolerance = 0.0
        # Fall-through to below to add failure values

    elif reference_result.dtype == np.float32:
        tolerance = float_tolerance
        if np.allclose(reference_result, test_result, atol=tolerance, equal_nan=True):
            print_color(LogColors.GREEN, "Results PASS {}".format(test_name))
            return (TestResult.PASS, tolerance, "")
        msg = "Float result does not match within tolerance of {}".format(tolerance)
        # Fall-through to below to add failure values

    else:
        print_color(LogColors.RED, "Results UNSUPPORTED TYPE {}".format(test_name))
        msg = "Unsupported results type: {}".format(reference_result.dtype)
        return (TestResult.MISMATCH, 0.0, msg)

    # Fall-through for mismatch failure to add values to msg
    print_color(LogColors.RED, "Results MISCOMPARE {}".format(test_name))
    np.set_printoptions(threshold=128)
    msg = "{}\ntest_result: {}\n{}".format(msg, test_result.shape, test_result)
    msg = "{}\nreference_result: {}\n{}".format(
        msg, reference_result.shape, reference_result
    )
    return (TestResult.MISMATCH, tolerance, msg)


def main(argv=None):
    """Check that the supplied reference and result files are the same."""
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "reference_path", type=Path, help="the path to the reference file to test"
    )
    parser.add_argument(
        "result_path", type=Path, help="the path to the result file to test"
    )
    args = parser.parse_args(argv)
    ref_path = args.reference_path
    res_path = args.result_path

    result, tolerance, msg = test_check(ref_path, res_path)
    if result != TestResult.PASS:
        print(msg)

    return result


if __name__ == "__main__":
    exit(main())