from math import log

class Calculator():
    """Calculator class for the Intermediate Python
    class led by Ed Fine from Pluralsight. This has
    basic calculator functions including keeping a running
    total.
    """

    def __init__(self):
        self.total = 0.0
        self.actions = []
    
    def add(self, val1, val2=None):
        """Add two numbers together and prints the result
        then adds the sum to the running total. With only
        one number provided, just add that to the running
        total.
        """
        running_total = self.total
        
        if val2:
            total = val1 + val2
            print(total)
            self.actions.append(f"{val1} + {val2}")
        else:
            total = val1
            self.actions.append(f"{val1} + {running_total}")
        
        self.total += total
        self.actions.append(f" = {self.total}")
    
    def sub(self, val1, val2=None):
        """Subtracts val2 from val1 and prints the result
        then subtracts the difference from the running total.
        With only one number provided, just subtract that to
        the running total.
        """
        running_total = self.total
        
        if val2:
            total = val1 - val2
            print(total)
            self.actions.append(f"{val1} - {val2}")
        else:
            total = val1
            self.actions.append(f"{val1} - {running_total}")
        
        self.total -= total
        self.actions.append(f" = {self.total}")
    
    def mult(self, val1, val2=None):
        """Multiplies the new values and prints the result
        then multiplies the product to the running total.
        With only one number provided, just mulitply the
        running total with the lone value.
        """
        running_total = self.total
        
        if val2:
            total = val1 * val2
            print(total)
            self.actions.append(f"{val1} * {val2}")
        else:
            total = val1
            self.actions.append(f"{val1} * {running_total}")
        
        self.total *= total
        self.actions.append(f" = {self.total}")
    
    def div(self, val1, val2=None):
        """Divides val1 by val2 and prints the result
        then divides the running total by the quotient.
        With only one number provided, the running total
        will be divided by the value.
        """
        running_total = self.total
        
        if val2:
            total = val1 / val2
            print(total)
            self.actions.append(f"{val1} / {val2}")
        else:
            total = val1
            self.actions.append(f"{val1} / {running_total}")
        
        self.total /= total
        self.actions.append(f" = {self.total}")
    
    def pow(self, val1, val2=None):
        """Raises val1 to the power of val2 and prints
        the result then raises the running total by the
        result. With only one number provided, just
        raise the running total by the lone value.
        """
        running_total = self.total
        
        if val2:
            total = val1 ** val2
            print(total)
            self.actions.append(f"{val1} ** {val2}")
        else:
            total = val1
            self.actions.append(f"{val1} ** {running_total}")
        
        self.total = total ** self.total
        self.actions.append(f" = {self.total}")
     
    def log(self, val):
        """Prints the logarithm of the value. This
        does not affect the running total.
        """
        print(log(val))
        self.actions.append(f"log({val})")
        
        # self.total = log(val) ** self.total
        # self.actions.append(f" = {self.total}")
 
    def showcalc(self):
        """Prints out the running history since the
        last all clear command.
        """
        for action in self.actions:
            print(action)
    
    def total(self):
        """Prints the running total."""
        return(self.total)
    
    def ac(self):
        """Resets the running total to 0.0 and
        empties the history."""
        self.total = 0.0
        self.actions = []