# Copyright 2024 Bytedance Ltd. and/or its affiliates
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import argparse

import numpy as np


def extract_reward_from_line(line):
    # TODO: this function needs error handling
    try:
        key_vals = line.split(' - ')
        for key_val in key_vals:
            key, val = key_val.split(':')
            if key == 'critic/rewards/mean':
                reward = float(val)
                return reward
        return -np.inf
    except Exception:
        return -np.inf


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('--output_file', required=True, type=str)
    parser.add_argument('--target', type=float, default=0.2, help='target reward score')

    args = parser.parse_args()

    with open(args.output_file, 'r') as f:
        output = f.read().split('\n')

    best_reward = -np.inf
    for line in output:
        if line.startswith('step'):
            reward = extract_reward_from_line(line)
            if reward > best_reward:
                best_reward = reward

    print(f'Best reward is {best_reward}')
    assert best_reward > args.target, f'Best reward must be greater than {args.target}. best_reward: {best_reward}'
    print('Check passes')