# tennis2.py
# Andrew Davison, ad@coe.psu.ac.th, May 2025
'''
  version of tennis.py using a subgraph and
  invisible edges for ordering
'''

import graphviz as gv

TEMP_FNM = 'temp_graph'

t = gv.Digraph(format='png')
t.attr(label='Tennis Tournament 2')
t.attr(rankdir='LR')
t.attr('node', shape='box')

# player nodes
t.node('Player 1', shape='none')
t.node('Player 2', shape='none')
t.node('Player 3', shape='none')
t.node('Player 4', shape='none')
t.node('Player 5', shape='none')
t.node('Player 6', shape='none')
t.node('Player 7', shape='none')
t.node('Player 8', shape='none')

# force the players to be in order
# going down the graph
with t.subgraph() as ps:
  ps.attr(rankdir='TB', rank='same') 
  ps.edge('Player 1', 'Player 2', style='invis')
  ps.edge('Player 2', 'Player 3', style='invis')
  ps.edge('Player 3', 'Player 4', style='invis')

  ps.edge('Player 5', 'Player 6', style='invis')
  ps.edge('Player 6', 'Player 7', style='invis')
  ps.edge('Player 7', 'Player 8', style='invis')

# game nodes
t.node('Game 1')
t.node('Game 2')
t.node('Game 3')
t.node('Game 4')
t.node('Game 5')
t.node('Game 6')
t.node('Game 7')

# link players and games
t.edge('Player 1', 'Game 1')
t.edge('Player 2', 'Game 1')

t.edge('Player 3', 'Game 2')
t.edge('Player 4', 'Game 2')

t.edge('Player 5', 'Game 3')
t.edge('Player 6', 'Game 3')

t.edge('Player 7', 'Game 4')
t.edge('Player 8', 'Game 4')

t.edge('Game 1', 'Game 5')
t.edge('Game 2', 'Game 5')

t.edge('Game 3', 'Game 6')
t.edge('Game 4', 'Game 6')

t.edge('Game 5', 'Game 7')
t.edge('Game 6', 'Game 7')

t.render(filename=TEMP_FNM, view=True, cleanup=True)