import time
import streamlit as st
from os import environ

class Timer():
    total = 0
    place_holder = None
    expander = None
    timer_list = []
    def __init__(self, pt_name, en_name):
        self.pt_name = pt_name
        self.en_name = en_name
        if environ['PORTUGUESE'] == 'true':
            self.portuguese = True
        elif environ['PORTUGUESE'] == 'false':
            self.portuguese = False
        else:
            raise EnvironmentError
        if not Timer.place_holder:
            if self.portuguese:
                Timer.place_holder = st.empty()
                Timer.expander = Timer.place_holder.expander('Ver progresso')
            else:
                Timer.place_holder = st.empty()
                Timer.expander = Timer.place_holder.expander('See progress')
        self.display = Timer.expander.empty()
        Timer.timer_list.append(self)
            
    def __enter__(self):
        if self.portuguese:
            self.display.info(f'Executando "{self.pt_name}"...')
        else:
            self.display.info(f'Running "{self.en_name}"...')
        self.start_time = time.time()

    def __exit__(self, type, value, traceback):
        end_time = time.time()
        elapsed_time = end_time - self.start_time
        self.display.empty()
        if self.portuguese:
            Timer.expander.info(f'"{self.pt_name}" terminou em {elapsed_time:.2f} s')
        else:
            Timer.expander.info(f'"{self.en_name}" finished in {elapsed_time:.2f} s')

    # for manually starting the timer
    def start(self):
        if self.portuguese:
            self.display.warning(f'Executando "{self.pt_name}"...')
        else:
            self.display.warning(f'Running "{self.en_name}"...')
        self.start_time = time.time()

    # for manually stopping the timer
    def stop(self):
        end_time = time.time()
        elapsed_time = end_time - self.start_time
        Timer.total += elapsed_time
        self.display.empty()
        if self.portuguese:
            Timer.expander.warning(f'"{self.pt_name}" terminou em {elapsed_time:.2f} s')
        else:
            Timer.expander.warning(f'"{self.en_name}" finished in {elapsed_time:.2f} s')

    def reset():
        Timer.total = 0
        if Timer.place_holder:
            Timer.place_holder.empty()
        Timer.place_holder = None
        Timer.expander = None

    def show_total():
        if environ['PORTUGUESE'] == 'true':
            Timer.expander.success(f'Tempo de execução total: {Timer.total:.2f} s')
        elif environ['PORTUGUESE'] == 'false':
            Timer.expander.success(f'Total elapsed time: {Timer.total:.2f} s')

    def time_it(pt_name, en_name):
        def decorator(func):
            def wrapper(*args, **kwargs):
                timer = Timer(pt_name, en_name)
                timer.start()
                result = func(*args, **kwargs)
                timer.stop()
                return result
            return wrapper
        return decorator