package util

import (
	"testing"
	"time"

	"github.com/blend/go-sdk/assert"
)

func TestTimeDiffDays(t *testing.T) {
	assert := assert.New(t)

	t1 := time.Date(2017, 02, 27, 12, 0, 0, 0, time.UTC)
	t2 := time.Date(2017, 01, 10, 3, 0, 0, 0, time.UTC)
	t3 := time.Date(2017, 02, 24, 16, 0, 0, 0, time.UTC)

	assert.Equal(48, Time.DiffDays(t2, t1))
	assert.Equal(2, Time.DiffDays(t3, t1)) // technically we should round down.
}

func TestTimeDiffHours(t *testing.T) {
	assert := assert.New(t)

	t1 := time.Date(2017, 02, 27, 12, 0, 0, 0, time.UTC)
	t2 := time.Date(2017, 02, 24, 16, 0, 0, 0, time.UTC)
	t3 := time.Date(2017, 02, 28, 12, 0, 0, 0, time.UTC)

	assert.Equal(68, Time.DiffHours(t2, t1))
	assert.Equal(24, Time.DiffHours(t1, t3))
}

func TestTimeStartAndEnd(t *testing.T) {
	assert := assert.New(t)
	values := []time.Time{
		time.Now().AddDate(0, 0, -1),
		time.Now().AddDate(0, 0, -2),
		time.Now().AddDate(0, 0, -3),
		time.Now().AddDate(0, 0, -4),
	}
	min, max := Time.StartAndEnd(values...)
	assert.Equal(values[3], min)
	assert.Equal(values[0], max)
}

func TestTimeStartAndEndReversed(t *testing.T) {
	assert := assert.New(t)
	values := []time.Time{
		time.Now().AddDate(0, 0, -4),
		time.Now().AddDate(0, 0, -2),
		time.Now().AddDate(0, 0, -3),
		time.Now().AddDate(0, 0, -1),
	}
	min, max := Time.StartAndEnd(values...)
	assert.Equal(values[0], min)
	assert.Equal(values[3], max)
}

func TestTimeStartAndEndEmpty(t *testing.T) {
	assert := assert.New(t)
	values := []time.Time{}
	min, max := Time.StartAndEnd(values...)
	assert.Equal(time.Time{}, min)
	assert.Equal(time.Time{}, max)
}