# coding=utf-8
import logging
import math
import time
from functools import wraps


logger = logging.getLogger(__name__)


class Timer:
    """
    A timing util to measure code execution time in human readable
    format for a snippet of code or method.
    Usage:
    with Timer() as t:
        some code ...
    print(t.runtime)
    or
    @time_it()
    def some_func():
        some code ...
    returns: "time taken by method.module method.name: x seconds x ms"
    for raw timing use raw kwarg
    ex:
    with Timer(raw=True) as t:
        some code ...
    @time_it(raw=True)
    def some_func():
        some code ...
    returns: "time taken by method.module method.name: x.xxxx"
    @dakaugu
    """

    def __init__(self, raw=False):
        self.runtime = 0
        self.raw = raw

    def __enter__(self):
        self.runtime = self.time_me()
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        self.runtime = self.time_me(start_time=self.runtime, raw=self.raw)

    @staticmethod
    def time_me(start_time=None, raw=False):
        if start_time:
            elapsed_time = time.time() - start_time
            if raw:
                return elapsed_time
            hours = math.floor(elapsed_time / 3600)
            elapsed_time = elapsed_time - hours * 3600
            minutes = math.floor(elapsed_time / 60)
            elapsed_time = elapsed_time - minutes * 60
            seconds = math.floor(elapsed_time)
            elapsed_time = elapsed_time - seconds
            ms = math.floor(elapsed_time * 1000)
            micros = elapsed_time * 1000 * 1000
            if hours:
                return "%d hours %d minutes %d seconds" % (hours, minutes, seconds)
            elif minutes:
                return "%d minutes %d seconds" % (minutes, seconds)
            elif seconds:
                return "%d seconds %d ms" % (seconds, ms)
            elif ms:
                return "%d ms" % ms
            return "%d μs" % micros
        return time.time()


def time_it(raw=False):
    def dec(func):
        @wraps(func)
        def wrapper(*args, **kwargs):
            with Timer(raw=raw) as t:
                result = func(*args, **kwargs)
            logger.info("time taken by %s %s: %s" %
                        (func.__module__, func.__name__, t.runtime))
            return result
        return wrapper
    return dec