############################################################
# COMPUTER SCIENCE UNDERGRADUATE SCHOLARSHIP EXAM
# UNIVERSITY OF WAIKATO
# PYTHON PROGRAMMING LANGUAGE
# JULIANO TAVARES (TAURANGA BOYS' COLLEGE YR 13)
############################################################

# Import modules
import sys

# Welcome user
print("Welcome to Visualising Graphs")

# Build the backend of the grid for the graph
def main():
    graph_grid = [[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                [0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
               ]

# Set variables
max_x = 8
max_y = 24

# Set scale for the graph grid (list)
scale = [4, 3, 2, 1, 0, -1, -2, -3, -4]

# Draw the grid for the graph
graph_grid = [[" " for col in range(max_y + 1)] for row in range(max_x + 1)]

# Draw the vertical line on the first column
for col in range(max_y + 1):
    graph_grid[4][col] = "_"

# Draw the horizontal line on the last row
for row in range(max_x + 1):
    graph_grid[row][0] = "|"

# Draw x's on y(2)
for col in range(1, max_x + 1):  
    graph_grid[2][col] = "x"  
# Draw y's on x(4)
for row in range(1, max_x + 1):  
    graph_grid[row][3] = "x"  


# Showing the scale on the side of the grid
for row, scale_value in zip(graph_grid, scale):
    # Convert each item in row to a string and join them
    print(f"{scale_value:<5}{''.join(str(item) for item in row)}")