import collections
import json
import sys

actual = sys.argv[1]
expect = sys.argv[2]

with open(actual) as file_actual:
    json_actual = json.loads(file_actual.read())

with open(expect) as file_expect:
    json_expect = json.loads(file_expect.read())


def almost_equal(x, y, threshold=0.05):
    return abs(x - y) < threshold


# loss curve tail match
loss_tail_length = 4
loss_tail_matches = collections.deque(maxlen=loss_tail_length)
logged_steps = len(json_actual["steps"])
for i in range(logged_steps):
    step_actual = json_actual["steps"][i]
    step_expect = json_expect["steps"][i]

    is_match = step_actual["step"] == step_expect["step"]
    is_match = is_match if almost_equal(step_actual["loss"], step_expect["loss"]) else False
    loss_tail_matches.append(is_match)

    print(
        "step {} loss actual {:.6f} expected {:.6f} match {}".format(
            step_actual["step"],
            step_actual["loss"],
            step_expect["loss"],
            is_match if logged_steps - i <= loss_tail_length else "n/a",
        )
    )

success = all(loss_tail_matches)

# performance match
threshold = 0.95
is_performant = json_actual["samples_per_second"] >= threshold * json_expect["samples_per_second"]
success = success if is_performant else False
print(
    "samples_per_second actual {:.3f} expected {:.3f} in-range {}".format(
        json_actual["samples_per_second"], json_expect["samples_per_second"], is_performant
    )
)

assert success