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/*
* Copyright (c) 2012 Benjamin Franzke <benjaminfranzke@googlemail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
:-initialization(start).
pay(c,d,1).
pay(d,d,2).
pay(c,c,3).
pay(d,c,4).
pay2(A, B, PayA, PayB) :-
pay(A, B, PayA),
pay(B, A, PayB).
% Use opponents last decision
tit4tat_select(H,[H|_]).
% Fallback to coorporate at beginning
tit4tat_select(c,[]).
tit4tat(A, Hist, PayA, PayB) :-
tit4tat_select(Old, Hist),
pay2(A, Old, PayA, PayB).
sum([], 0).
sum([H|T], S) :- sum(T, TMP), S is TMP + H.
do(e, _, _, _) :- !.
do(Choice, Hist, PayedA, PayedB) :-
tit4tat(Choice, Hist, PayA, PayB),
write('A Pay: '), write(PayA), write('\t'),
write('B Pay: '), write(PayB), write('\t'),
write('A: '), sum([PayA|PayedA], SumA), write(SumA), write('\t'),
write('B: '), sum([PayB|PayedB], SumB), write(SumB), nl,
write(Choice),nl,
loop([Choice|Hist], [PayA|PayedA], [PayB|PayedB]).
loop(Hist, PayedA, PayedB) :-
write('Type c,d or e to end: '), read(Choice),
do(Choice, Hist, PayedA, PayedB).
start :- loop([], [], []), halt.
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