(ns frontend.util-test
  (:require [cljs.test :refer [deftest is testing]]
            [frontend.util :as util]))

(deftest test-delete-emoji-current-pos
  (testing "safe current position from end for emoji"
    (is (= 3 (util/safe-dec-current-pos-from-end "abc😀d" 5)))
    (is (= 3 (util/safe-dec-current-pos-from-end "abc😀" 5)))
    (is (= 0 (util/safe-dec-current-pos-from-end "😀" 2)))
    (is (= 0 (util/safe-dec-current-pos-from-end "a" 1)))
    (is (= 4 (util/safe-dec-current-pos-from-end "abcde" 5)))
    (is (= 1 (util/safe-dec-current-pos-from-end "中文" 2)))
    (is (= 0 (util/safe-dec-current-pos-from-end "中" 1)))
    (is (= 0 (util/safe-dec-current-pos-from-end "a" 1))))

  (testing "safe current position from start for emoji"
    (is (= 5 (util/safe-inc-current-pos-from-start "abc😀d" 3)))
    (is (= 2 (util/safe-inc-current-pos-from-start "abcde" 1)))
    (is (= 1 (util/safe-inc-current-pos-from-start "中文" 0)))
    (is (= 2 (util/safe-inc-current-pos-from-start "😀" 0)))
    (is (= 1 (util/safe-inc-current-pos-from-start "中" 0)))
    (is (= 1 (util/safe-inc-current-pos-from-start "a" 0)))))

(deftest test-get-line-pos
  (testing "get-line-pos"
    (is (= 3 (util/get-line-pos "abcde" 3)))
    (is (= 4 (util/get-line-pos "abcd\ne" 4)))
    (is (= 0 (util/get-line-pos "abcd\ne" 5)))
    (is (= 4 (util/get-line-pos "abc😀d" 5)))
    (is (= 1 (util/get-line-pos "abc\nde" 5)))
    (is (= 1 (util/get-line-pos "abc\n😀d" 6)))
    (is (= 2 (util/get-line-pos "ab\nc😀d" 6)))
    (is (= 1 (util/get-line-pos "abc\nde\nf" 5)))
    (is (= 1 (util/get-line-pos "abc\n😀d\ne" 6)))
    (is (= 2 (util/get-line-pos "ab\nc😀d\ne" 6)))))

(deftest test-memoize-last
  (testing "memoize-last add test"
    (let [actual-ops (atom 0)
          m+ (util/memoize-last (fn [x1 x2]
                                  (swap! actual-ops inc)    ;; side effect for counting
                                  (+ x1 x2)))]
      (is (= (m+ 1 1) 2))
      (is (= @actual-ops 1))
      (is (= (m+ 1 1) 2))
      (is (= (m+ 1 1) 2))
      (is (= @actual-ops 1))
      (is (= (m+ 1 2) 3))
      (is (= @actual-ops 2))
      (is (= (m+ 2 3) 5))
      (is (= @actual-ops 3))
      (is (= (m+ 3 5) 8))
      (is (= @actual-ops 4))
      (is (= (m+ 3 5) 8))
      (is (= @actual-ops 4)))))