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import time
import torch
from fastspeech.utils.logging import tprint

class TimeElapsed(object):
    
    def __init__(self, name, device='cuda', cuda_sync=False, format=""):
        self.name = name
        self.device = device
        self.cuda_sync = cuda_sync
        self.format = format
    
    def __enter__(self):
        if self.device == 'cuda' and self.cuda_sync:
            torch.cuda.synchronize()
        self.start_time = time.time()
    
    def __exit__(self, *exc_info):
        if self.device == 'cuda' and self.cuda_sync:
            torch.cuda.synchronize()
        self.end_time = time.time()
        self.time_elapsed = self.end_time - self.start_time
        tprint(("[{}] Time elapsed: {" + self.format + "}").format(self.name, self.time_elapsed))