import sys

# Author:  James Tam
# Version: March 20, 2018
# Note: due the missing code, this program is not executable

# Learning concepts:
# * Finding the solution to a 'tough' problem

ROWS = 4
COLUMNS = 6
NUMBERS = "  0 1 2 3 4 5"
LINES   = "  - - - - - -" 
PLAYER = "P"
MONSTER = "M"
EMPTY = " "
P_START_ROW = 2
P_START_COLUMN = 2

# Return values hard-coded to (0,0) so program does not crash
# but code to move the monster must be implemented as a student
# exercise
def chase(pRow,pColumn,mRow,mColumn):
    print("You have to write the code for chase()")
    return(0,0)  

# function: garden
# garden(2DList)
# returns(nothing)
# Creates 4x5 garden: all locations empty except default
# location for player (2,2)
def initialize(garden):
    for r in range (0, ROWS, 1):
        garden.append([])
        for c in range (0, COLUMNS, 1):
            garden[r].append(" ")

    # Position player
    garden[P_START_ROW][P_START_COLUMN] = PLAYER

def display(garden):
    print(NUMBERS)
    for r in range (0, ROWS, 1):
        print(LINES)
        print(r, end="")        
        for c in range (0, COLUMNS, 1):
            sys.stdout.write("|")
            sys.stdout.write(garden[r][c])
        print('|')
    print(LINES)

# function: getMonsterLocation
# getMonsterLocation()
# return(int,int)
# Gets the starting location of the monster from the user.                     
def getMonsterLocation():
    print("Enter monster  row: ", end="")
    row = int(input())
    print ("Enter monster column: ", end="")
    column = int(input())
    return(row,column)

def move(garden,mRow,mColumn,dRow,dColumn):
    print("You have to write the code for move()")


def set(garden,character,row,column):
    garden[row][column] = character

# Part I: Move
# Write the definition of the move() function here

# Part II: Chase
# Write the definition of the chase() function here

def start():
    garden = []
    pRow = P_START_ROW
    pColumn = P_START_COLUMN
    dRow = -1
    dColumn = -1
    mRow = -1
    mColumn = -1
    initialize(garden)
    display(garden)

    mRow,mColumn = getMonsterLocation()
    set(garden,MONSTER,mRow,mColumn)
    print("Drawing garden with monster")
    display(garden)


    # Part II: Write the code ('chase' function) that will         
    # make the computer 'monster' chase the human player 
    # 'chase' function. Hint: it should return the 
    # destination (row,column) of the computer.
    dRow,dColumn = chase(pRow,pColumn,mRow,mColumn)

    # Part I: Write the code ('move' function) that will move    
    # the monster from the current location (mRow,mColumn) to 
    # the destination(dRow,dColumn) in the garden. 
    move(garden,mRow,mColumn,dRow,dColumn)

    # Update current monster (row,column)
    mRow = dRow
    mColumn = dColumn
    input("<<< Hit enter to see the effects of the chase >>>")
    display (garden)


start()