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(ns unheard.cycles-test
(:require [clojure.test :refer [deftest is testing]]
[unheard.cycles :refer [l f p rate elongate unfold]]))
(deftest unfold-tests
(testing "single scalar"
(is (= [[0 1 :a]]
(unfold 1 :a))))
(testing "simple list - time subdivision"
(is (= [[0 1/3 :a] [1/3 2/3 :b] [2/3 1 :c]]
(unfold 1 (l :a :b :c)))))
(testing "simple fork - cycles through children"
(is (= [[0 1 :a]
[1 2 :b]
[2 3 :c]]
(unfold 1 (f :a :b :c)))))
(testing "list with fork - fork gets time slice"
(is (= [[0 1/2 :1] [1/2 1 :2]
[1 3/2 :1] [3/2 2 :3]]
(unfold 1 (l :1 (f :2 :3))))))
(testing "fork with list - each child subdivides its cycle"
(is (= [[0 1/2 :a] [1/2 1 :b]
[1 2 :c]]
(unfold 1 (f (l :a :b) :c)))))
(testing "nested lists"
(is (= [[0 1/2 :a] [1/2 3/4 :b] [3/4 1 :c]]
(unfold 1 (l :a (l :b :c))))))
(testing "nested forks"
(is (= [[0 1 :a]
[1 2 :b]
[2 3 :c]
[3 4 :d]
[4 5 :a]
[5 6 :e]
[6 7 :c]
[7 8 :d]]
(unfold 1 (f :a (f :b :e) :c :d)))))
(testing "complex nested structure from example"
(is (= [[0 1/2 :1] [1/2 3/4 :2] [3/4 1 :9] [1 3/2 :6] [3/2 2 :7]
[2 5/2 :1] [5/2 3 :3] [3 7/2 :6] [7/2 4 :8]
[4 9/2 :1] [9/2 5 :4] [5 11/2 :6] [11/2 6 :7]
[6 13/2 :1] [13/2 27/4 :2] [27/4 7 :9] [7 15/2 :6] [15/2 8 :8]
[8 17/2 :1] [17/2 9 :3] [9 19/2 :6] [19/2 10 :7]
[10 21/2 :1] [21/2 11 :5] [11 23/2 :6] [23/2 12 :8]]
(unfold 2 (l :1 (f (l :2 :9) :3 (f :4 :5)) :6 (f :7 :8))))))
(testing "different cycle lengths"
(is (= [[0 1/2 :a] [1/2 1 :b]]
(unfold 1 (l :a :b))))
(is (= [[0 1 :a] [1 2 :b]]
(unfold 2 (l :a :b))))
(is (= [[0 5/2 :a] [5/2 5 :b]]
(unfold 5 (l :a :b)))))
(testing "fork with nested list subdivides correctly"
(is (= [[0 1/3 :a] [1/3 2/3 :b] [2/3 1 :c]
[1 2 :x]]
(unfold 1 (f (l :a :b :c) :x)))))
(testing "simple parallel - all children at same time"
(is (= [[0 1 :a] [0 1 :b] [0 1 :c]]
(unfold 1 (p :a :b :c)))))
(testing "parallel with list - children subdivide in parallel"
(is (= [[0 1/2 :a] [1/2 1 :b]
[0 1/2 :c] [1/2 1 :d]]
(unfold 1 (p (l :a :b) (l :c :d))))))
(testing "parallel with fork - forks extend together"
(is (= [[0 1 :a] [0 1 :c]
[1 2 :b] [1 2 :d]]
(unfold 1 (p (f :a :b) (f :c :d))))))
(testing "list containing parallel"
(is (= [[0 1/2 :x] [0 1/2 :y]
[1/2 1 :z]]
(unfold 1 (l (p :x :y) :z)))))
(testing "parallel with different cycle lengths"
(is (= [[0 1 :a] [0 1 :b]
[1 2 :a] [1 2 :c]]
(unfold 1 (p :a (f :b :c))))))
(testing "rate 2 - doubles speed of scalar"
(is (= [[0 1/2 :a] [1/2 1 :a]]
(unfold 1 (rate 2 :a)))))
(testing "rate 1/2 - halves speed of scalar"
(is (= [[0 2 :a]]
(unfold 1 (rate 1/2 :a)))))
(testing "rate 2 - doubles speed of list"
(is (= [[0 1/6 :a] [1/6 1/3 :b] [1/3 1/2 :c]
[1/2 2/3 :a] [2/3 5/6 :b] [5/6 1 :c]]
(unfold 1 (rate 2 (l :a :b :c))))))
(testing "rate 1/2 - halves speed of list"
(is (= [[0 1 :a] [1 2 :b]]
(unfold 1 (rate 1/2 (l :a :b))))))
(testing "rate 2 - doubles speed of fork"
;; Fork has 3 children, cycle count is 3
;; rate 2 makes it repeat 2x, so 6 total cycles
(is (= [[0 1/6 :a] [1/6 1/3 :b] [1/3 1/2 :c]
[1/2 2/3 :a] [2/3 5/6 :b] [5/6 1 :c]
[1 7/6 :a] [7/6 4/3 :b] [4/3 3/2 :c]
[3/2 5/3 :a] [5/3 11/6 :b] [11/6 2 :c]
[2 13/6 :a] [13/6 7/3 :b] [7/3 5/2 :c]
[5/2 8/3 :a] [8/3 17/6 :b] [17/6 3 :c]]
(unfold 1 (rate 2 (f :a :b :c))))))
(testing "rate with parallel"
;; Parallel has cycle 1, rate 2 repeats it twice
(is (= [[0 1/2 :a] [0 1/2 :b]
[1/2 1 :a] [1/2 1 :b]]
(unfold 1 (rate 2 (p :a :b))))))
(testing "rate inside list"
(is (= [[0 1/2 :x] [1/2 3/4 :y] [3/4 1 :y]]
(unfold 1 (l :x (rate 2 :y))))))
(testing "nested rates"
(is (= [[0 1/4 :a] [1/4 1/2 :a] [1/2 3/4 :a] [3/4 1 :a]]
(unfold 1 (rate 2 (rate 2 :a))))))
(testing "elongate 2 - element takes twice as long"
(is (= [[0 1/2 :a] [1/2 3/4 :b] [3/4 1 :c]]
(unfold 1 (l (elongate 2 :a) :b :c)))))
(testing "elongate 3 - element takes three times as long"
(is (= [[0 3/5 :a] [3/5 4/5 :b] [4/5 1 :c]]
(unfold 1 (l (elongate 3 :a) :b :c)))))
(testing "multiple elongations"
(is (= [[0 2/5 :a] [2/5 4/5 :b] [4/5 1 :c]]
(unfold 1 (l (elongate 2 :a) (elongate 2 :b) :c)))))
(testing "elongate with fork"
(is (= [[0 1 :a] [1 2 :b]]
(unfold 1 (f (elongate 2 :a) :b)))))
(testing "elongate inside parallel"
(is (= [[0 1 :a] [0 1 :b]]
(unfold 1 (p (elongate 2 :a) :b)))))
(testing "elongate with rate"
(is (= [[0 1/2 :a] [1/2 1 :a]]
(unfold 1 (elongate 2 (rate 2 :a))))))
(testing "rate with elongate inside list"
(is (= [[0 1/4 :a] [1/4 3/8 :b] [3/8 1/2 :c]
[1/2 3/4 :a] [3/4 7/8 :b] [7/8 1 :c]]
(unfold 1 (rate 2 (l (elongate 2 :a) :b :c)))))))
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