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;;; Lisparuga
;;; Copyright © 2016 David Thompson <davet@gnu.org>
;;;
;;; Lisparuga 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.
;;;
;;; Lisparuga 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 Lisparuga. If not, see <http://www.gnu.org/licenses/>.
(define-module (lisparuga stats)
#:use-module (sly records)
#:use-module (lisparuga enemies)
#:use-module (lisparuga player)
#:use-module (lisparuga utils)
#:export (make-stats
stats?
stats-score
stats-lives
stats-chain
stats-chain-type
stats-chain-progress
decrement-life
add-to-score
add-to-chain))
(define-record-type* <stats>
%make-stats make-stats
stats?
(score stats-score 0)
(lives stats-lives 3)
(chain stats-chain 0)
(chain-type stats-chain-type #f)
(chain-progress stats-chain-progress 0))
(define (decrement-life stats)
(make-stats #:inherit stats
#:lives (max 0 (1- (stats-lives stats)))))
(define max-chain-multiplier 10)
(define (add-to-score enemy stats)
;; TODO: Award different points for different types of enemies.
(make-stats #:inherit stats
#:score (+ (stats-score stats)
1000 ; base kill points
;; Chain multiplier.
(* 255
(min (stats-chain stats)
max-chain-multiplier)))))
(define (add-to-chain enemy stats)
(let* ((enemy-polarity (enemy-polarity enemy))
(chain-polarity (stats-chain-type stats))
(progress (stats-chain-progress stats)))
(cond
((or (zero? progress) (= progress 3))
(make-stats #:inherit stats
#:chain-type enemy-polarity
#:chain-progress 1))
((not (eq? enemy-polarity chain-polarity))
(make-stats #:inherit stats
#:chain-type #f
#:chain-progress 0
#:chain 0))
((= progress 1)
(make-stats #:inherit stats
#:chain-progress 2))
((= progress 2)
(make-stats #:inherit stats
#:chain-progress 3
#:chain (1+ (stats-chain stats)))))))
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