package one

import (
	"testing"

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

func TestCheckIncreased(t *testing.T) {
	tt := map[string]struct {
		input []int
		want  bool
	}{
		"nominal": {
			input: []int{1, 3, 6, 7, 9},
			want:  true,
		},
		"unsafe": {
			input: []int{1, 3, 2, 4, 8},
			want:  false,
		},
		"two numbers the same": {
			input: []int{1, 3, 3, 4, 8},
			want:  false,
		},
	}

	cmp := func(nums []int, i int) bool {
		return nums[i-1] >= nums[i]
	}

	for name, tc := range tt {
		t.Run(name, func(t *testing.T) {
			got := check(tc.input, cmp)
			assert.Equal(t, tc.want, got)
		})
	}
}

func TestCheckDecreased(t *testing.T) {
	tt := map[string]struct {
		input []int
		want  bool
	}{
		"nominal": {
			input: []int{7, 6, 4, 2, 1},
			want:  true,
		},
		"unsafe": {
			input: []int{9, 7, 6, 2, 1},
			want:  false,
		},
		"two numbers the same": {
			input: []int{8, 6, 4, 4, 1},
			want:  false,
		},
	}

	cmp := func(nums []int, i int) bool {
		return nums[i-1] <= nums[i]
	}

	for name, tc := range tt {
		t.Run(name, func(t *testing.T) {
			got := check(tc.input, cmp)
			assert.Equal(t, tc.want, got)
		})
	}
}