'''
Purpose: introduce decision making
'''

# determine chrysanthemum color given an input soil pH level
#       acidic soil produces pink chrysanthemums
#   non-acidic soil produces blue chrysanthemums

# acidity threshold

ACIDIC_THRESHOLD = 7.0     # samples less than threshold are acidic

# get soil pH level of interest
reply = input( 'Enter soil pH level: ' )

pH = float( reply )

print( )

# analyze and report effect on chrysanthemums
#   if acidic print 'pink';  otherwise print 'blue'

# if statements --> allow us to selectively execute certain blocks of code based on some conditions
#   if
#   ( logical expression ) -- parentheses not required but unless you have a specific order you want to evaluate
#                             the expression   (a and b) or c   vs     a and ( b or c )
#                             other languages will require ()
#                             we include () as a style rule so it makes it easier to see the expression
#   :
# if the ( logical expression ) is True, then we do what's in the if statement
# if it's False, then we do something else
if ( pH < ACIDIC_THRESHOLD ):
    # if pH is less than 7.0, then we print the string 'pink'
    print( 'pink' )

    # need to do some action underneath if:
    # cannot leave blank --> error

else:
    # else is OPTIONAL --> if there's on else: and if the if condition is not met --> will just do nothing and not
    # do the action underneath the if statement

    # if you do have an else:
    # else statement does NOT need a condition, because it assumes that the condition of the
    # (logical statement) in if is not met
    # else will execute if the logical statement in the if statement does not work out (False)
    # if pH is NOT less than 7.0 (or greater than or equal to)
    # then do these lines of codes, SKIP line 35 (or anything indented underneath if
    print( 'blue' )  # then print the string 'blue'

    # if you have an else: you need some action, cannot leave blank

# all done

# you can have nested if/else statements within another if/else statements
# can have a loop inside if/else statements
# inside loop, can have more if/else statements
# if ( something is True ):
#   for loop_var in sequence:
#       if loop_var == 1:
#           print( 'something' )
#       else:
#           print( 'idk' )
# else:
#   print( '🦆' )