#
# Complex number manipulation
#
# Matt Bishop, ECS 36A, Winter 2019
#
import copy

#
# defining complex numbers
#
class Mycomplex:

    # create it
    def __init__(self, r, i):
        self.real = r
        self.imag = i

    # generate a string form
    def __str__(self):
        if self.imag < 0:
            return str(self.real) + str(self.imag) + "i"
        else:
            return str(self.real) + "+" + str(self.imag) + "i"

    # some arithmetic operators
    def __add__(self, a):
        return Mycomplex(self.real + a.real, self.imag + a.imag)

    def __sub__(self, a):
        return Mycomplex(self.real - a.real, self.imag - a.imag)

    def __mul__(self, a):
        return Mycomplex(self.real * a.real - self.imag * a.imag,
                         self.real * a.imag + self.imag * a.real)

    # some comparison operators
    def __lt__(self, a):
        return self.real < a.real and self.imag < a.imag

    def __eq__(self, a):
        return self.real == a.real and self.imag == a.imag

    def __gt__(self, a):
        return self.real > a.real and self.imag > a.imag

#
# Here we use everything; first, create numbers
# x1 and x2 are comparable; x3 is not
#
print("--------------------------------------------------")
print("Generate 3 complex numbers:")
x1 = Mycomplex(3, 4)
x2 = Mycomplex(-3, -2)
x3 = Mycomplex(-5, 6)
print("x1 = "+str(x1)+", x2 ="+str(x2)+", x3 = "+str(x3))

# demonstrate the arithmetic operations
print("--------------------------------------------------")
print("Add x1 and x2:")
x4 = x1 + x2
print("x4 = x1 + x2 =", str(x4))
print("Subtract x3 from x2:")
x5 = x2 - x3
print("x5 = x2 - x3 =", str(x5))
print("Multiply x1 and x3:")
x6 = x1 * x3
print("x6 = x1 * x3 =", str(x6))

# demonstrate comparison operators
print("--------------------------------------------------")
print("Comparing x2 and x1:")
print("x2 < x1:", x2 < x1)
print("x2 == x1:", x2 == x1)
print("x2 > x1:", x2 > x1)
print("--------------------------------------------------")
print("Comparing x3 and x1:")
print("x3 < x1:", x3 < x1)
print("x3 == x1:", x3 == x1)
print("x3 > x1:", x3 > x1)

# demonstrate assignment
print("--------------------------------------------------")
print("Now we do assignment")
x1 = Mycomplex(3, 4)
x5 = x1
print("x1 =", x1, "and x5 =", x5)
print("Now we reset an attribute of x1")
x1.real = 5
print("x1 =", x1, "and x5 =", x5)

# demonstrate shallow copoies
print("--------------------------------------------------")
print("Now we do copy")
x1 = Mycomplex(3, 4)
x5 = copy.copy(x1)
print("x1 =", x1, "and x5 =", x5)
print("Now we reset an attribute of x1")
x1.real = 5
print("x1 =", x1, "and x5 =", x5)