#CS 171 by Shreedev Patel
#Section 068

import sys

planets=['Moon','Earth','Pluto','Neptune','Uranus','Saturn','Jupiter','Mars','Venus','Mercury','Sun']
gravity=[-1.622,-9.81,-0.42,-14.07,-10.67,-11.08,-25.95,-3.77,-8.87,-3.59,-274.13]
fuelAmount= [150,5000,1000,1000,1000,1000,1000,1000,1000,1000,50000]

def ask_fuel(current_fuel):
  while True:
    try:
      f= input('Enter units of fuel to use:\n')
      f= int(f)
      if f<0:
        print('Cannot use negative fuel.')
      if current_fuel < f:
        print('Not enough fuel. Max fuel')
      else:
        break
    except:
      print("Not a valid input.")
  return f

def play_level(names,gravity,fuel):
  G = gravity
  A = 50
  V = 0
  current_fuel = fuel
  s = 0
  T = 0.10
  print('Landing on the',names)
  print('Gravity is',G,'m/s^2')
  print('Initial Altitude',round(A,2),'meters')
  print('Initial Velocity',round(V,2),'m/s')
  print('Burning a unit of fuel causes 0.10m/s slowdown')
  print('Initial Fuel Level:',round(current_fuel,2),'units')
  print('\n')
  print('GO')
  while A>0:
    f = ask_fuel(current_fuel)
    current_fuel = current_fuel - f
    V=V+G+T*f
    A=A+V
    s=s+1
    if(A<0):
      A=0
    print('After',s,'seconds, altitude is',round(A,2),'meters, velocity is',round(V,2),'m/s.')
    if(current_fuel>-1):
      print('Remaining Fuel:',current_fuel)
  if -2<V<2:
      print('Landed')
      return True
  else:
      print('Crashed')
      return False
def game():
  for i in range(0,11):
    lev=input('Do you want to play level '+str(i+1)+'?')
    if not lev=='yes' and not lev =='Yes':
      sys.exit()
    print('Entering Level', i+1)
    a = play_level(planets[i], gravity[i],fuelAmount[i])
    if a == False:
      i -= 1
      input1 = input('Do you wanna play level {} again'.format(i+1))
      if input1 == 'yes':
        a = play_level(planets[i], gravity[i],fuelAmount[i])
      if input1 == 'no':
        break





  return

print('Welcome to Lunar Lander Game.')

game()