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# Modify the program from the Second Dictionary challenge of lecture 56
# to use shelves instead of dictionaries.
#
# Do this by creating two programs. cave_initialise.py should create the two
# shelves (locations and vocabulary) with the appropriate keys and values.
#
# cave_game.py will then use the two shelves instead of dictionaries.
# Apart from opening and closing the shelves, cave_game will need only
# two changes to the actual code - remember that shelf keys MUST be strings!
#
# Just to be clear, cave_game.py will contain the code from line 45, everything
# before that (modified to use shelves) will be in cave_initialise.py.

locations = {0: {"desc": "You are sitting in front of a computer learning Python",
                 "exits": {},
                 "namedExits": {}},
             1: {"desc": "You are standing at the end of a road before a small brick building",
                 "exits": {"W": 2, "E": 3, "N": 5, "S": 4, "Q": 0},
                 "namedExits": {"2": 2, "3": 3, "5": 5, "4": 4}},
             2: {"desc": "You are at the top of a hill",
                 "exits": {"N": 5, "Q": 0},
                 "namedExits": {"5": 5}},
             3: {"desc": "You are inside a building, a well house for a small stream",
                 "exits": {"W": 1, "Q": 0},
                 "namedExits": {"1": 1}},
             4: {"desc": "You are in a valley beside a stream",
                 "exits": {"N": 1, "W": 2, "Q": 0},
                 "namedExits": {"1": 1, "2": 2}},
             5: {"desc": "You are in the forest",
                 "exits": {"W": 2, "S": 1, "Q": 0},
                 "namedExits": {"2": 2, "1": 1}}
             }

vocabulary = {"QUIT": "Q",
              "NORTH": "N",
              "SOUTH": "S",
              "EAST": "E",
              "WEST": "W",
              "ROAD": "1",
              "HILL": "2",
              "BUILDING": "3",
              "VALLEY": "4",
              "FOREST": "5"}

loc = 1
while True:
    availableExits = ", ".join(locations[loc]["exits"].keys())

    print(locations[loc]["desc"])

    if loc == 0:
        break
    else:
        allExits = locations[loc]["exits"].copy()
        allExits.update(locations[loc]["namedExits"])

    direction = input("Available exits are " + availableExits).upper()
    print()

    # Parse the user input, using our vocabulary dictionary if necessary
    if len(direction) > 1:  # more than 1 letter, so check vocab
        words = direction.split()
        for word in words:
            if word in vocabulary:   # does it contain a word we know?
                direction = vocabulary[word]
                break

    if direction in allExits:
        loc = allExits[direction]
    else:
        print("You cannot go in that direction")