package cses

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestWeirdAlgo(t *testing.T) {
	assert.Equal(t, "[3 10 5 16 8 4 2 1]", WeirdAlgo(3))
}

func TestMissingNumber(t *testing.T) {
	assert.Equal(t, 4, MissingNumber(5, []int{2, 3, 1, 5}))
	assert.Equal(t, 7, MissingNumber(9, []int{2, 3, 1, 5, 4, 6, 9, 8}))
}

func TestRepetitions(t *testing.T) {
	assert.Equal(t, 0, Repetitions(""))
	assert.Equal(t, 3, Repetitions("ATTCGGGA"))
	assert.Equal(t, 4, Repetitions("AGGTTCGGGGA"))
}

func TestIncreasingArray(t *testing.T) {
	assert.Equal(t, 0, IncreasingArray(5, []int{}))
	assert.Equal(t, 0, IncreasingArray(5, []int{3}))
	assert.Equal(t, 5, IncreasingArray(5, []int{3, 2, 5, 1, 7}))
}

func TestBeautifulPermutations(t *testing.T) {
	assert.Equal(t, "NO SOLUTION", BeautifulPermutations(2))
	assert.Equal(t, "NO SOLUTION", BeautifulPermutations(3))
	assert.Equal(t, "[3 1 4 2]", BeautifulPermutations(4))
	assert.Equal(t, "[5 3 1 4 2]", BeautifulPermutations(5))
	assert.Equal(t, "[6 4 2 5 3 1]", BeautifulPermutations(6))
	assert.Equal(t, "[7 5 3 1 6 4 2]", BeautifulPermutations(7))
	assert.Equal(t, "[8 6 4 2 7 5 3 1]", BeautifulPermutations(8))
	assert.Equal(t, "[9 7 5 3 1 8 6 4 2]", BeautifulPermutations(9))
	assert.Equal(t, 48895, len(BeautifulPermutations(10000)))
}