import json

try:
    print("Retrieving player details")
    with open("gamedata.json", "r") as f:
        gamedata = json.load(f)
        name = gamedata["playername"]
        health = gamedata["playerhealth"]
        currentRoom = gamedata["playercurrentRoom"]
        inventory = gamedata["inventory"]
except:
    print("No player found, creating a new gamedata file")
    f = open('gamedata.json', 'w')
    f.close()
    name = None
    health = 5
    currentRoom = 'Hall'
    inventory = []

def showInstructions():
    # Print a main menu and the commands
    print('''
RPG Game
========

Get to the Garden with a key and a potion.
Avoid the monsters!

You are getting tired; each time you move you lose 1 health point.

Commands:
  go [direction]
  get [item]
''')

def showStatus():
  # Print the player's current status
  print('---------------------------')
  print(name + ' is in the ' + currentRoom)
  print("Health : " + str(health))
  # Print the current inventory
  print("Inventory : " + str(inventory))
  # Print an item if there is one
  if "item" in rooms[currentRoom]:
    if rooms[currentRoom]['item'] not in inventory:
      print('You see a ' + rooms[currentRoom]['item'])
  print("---------------------------")

#-# CODE WILL BE ADDED HERE IN THE NEXT STEP #-#
# Load data from the file
gamedata = {
      "playername": name,
      "playerhealth": health,
      "playercurrentRoom": currentRoom,
      "inventory": inventory
    }

with open("gamedata.json", "w") as f:
    json.dump(gamedata, f)

# A dictionary linking a room to other room positions
rooms = {
          'Hall' : { 'south' : 'Kitchen',
                     'east'  : 'Dining Room',
                     'item'  : 'key'
                   },

          'Kitchen' : { 'north' : 'Hall',
                        'item'  : 'monster'
                      },

          'Dining Room' : { 'west'  : 'Hall',
                            'south' : 'Garden',
                            'item'  : 'potion'
                          },

          'Garden' : { 'north' : 'Dining Room' }
        }

# Ask the player their name
if name is None:
  name = input("What is your name, Adventurer? ")
  showInstructions()

# Loop forever
while True:

  showStatus()

  # Get the player's next 'move'
  # .split() breaks it up into an list array
  # e.g. typing 'go east' would give the list:
  # ['go','east']
  move = ''
  while move == '':
    move = input('>')

  move = move.lower().split()

  if move[0] == 'quit':
      break

  # If they type 'go' first
  if move[0] == 'go':
    health = health - 1
    # Check that they are allowed wherever they want to go
    if len(move) > 1:
      if move[1] in rooms[currentRoom]:
        # Set the current room to the new room
        currentRoom = rooms[currentRoom][move[1]]
      # or, if there is no door (link) to the new room
      else:
        print('You can\'t go that way!')

  # If they type 'get' first
  if move[0] == 'get' :
    # If the room contains an item, and the item is the one they want to get
    if 'item' in rooms[currentRoom] and move[1] in rooms[currentRoom]['item']:
      # Add the item to their inventory
      inventory += [move[1]]
      # Display a helpful message
      print(move[1] + ' got!')
      # Delete the item from the room
      del rooms[currentRoom]['item']
    # Otherwise, if the item isn't there to get
    else:
      # Tell them they can't get it
      print('Can\'t get ' + move[1] + '!')

  # Player loses if they enter a room with a monster
  if 'item' in rooms[currentRoom] and 'monster' in rooms[currentRoom]['item']:
    print('A monster has got you... GAME OVER!')
    break

  if health == 0:
    print('You collapse from exhaustion... GAME OVER!')

  # Player wins if they get to the garden with a key and a potion
  if currentRoom == 'Garden' and 'key' in inventory and 'potion' in inventory:
    print('You escaped the house... YOU WIN!')
    break

  gamedata = {
    "playername": name,
    "playerhealth": health,
    "playercurrentRoom": currentRoom,
    "inventory": inventory
  }
  with open("gamedata.json", "w") as f:
      json.dump(gamedata, f)