package oncall_test

import (
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/target/goalert/oncall"
	"github.com/target/goalert/override"
)

func TestOverrideCalculator(t *testing.T) {
	t.Run("simple", func(t *testing.T) {
		later := time.Date(9999, 1, 0, 0, 0, 0, 0, time.UTC)
		overrides := []override.UserOverride{
			{AddUserID: "foo", End: later},
			{AddUserID: "bar", RemoveUserID: "rab", End: later},
			{RemoveUserID: "baz", End: later},
		}
		iter := oncall.NewTimeIterator(
			time.Date(2000, 1, 2, 3, 4, 0, 0, time.UTC),
			time.Date(2000, 1, 2, 3, 8, 0, 0, time.UTC),
			time.Minute,
		).NewOverrideCalculator(overrides)

		assert.True(t, iter.Next(), "Next()")

		result := iter.MapUsers([]string{"rab", "baz", "bin"})
		assert.EqualValues(t, []string{"bar", "bin", "foo"}, result)
	})

	t.Run("middle", func(t *testing.T) {
		start := time.Date(2000, 1, 2, 3, 5, 0, 0, time.UTC)
		end := time.Date(2000, 1, 2, 3, 6, 0, 0, time.UTC)
		overrides := []override.UserOverride{
			{AddUserID: "foo", Start: start, End: end},
			{AddUserID: "bar", RemoveUserID: "rab", Start: start, End: end},
			{RemoveUserID: "baz", Start: start, End: end},
		}
		iter := oncall.NewTimeIterator(
			time.Date(2000, 1, 2, 3, 4, 0, 0, time.UTC),
			time.Date(2000, 1, 2, 3, 8, 0, 0, time.UTC),
			time.Minute,
		).NewOverrideCalculator(overrides)

		assert.True(t, iter.Next(), "Next()")
		result := iter.MapUsers([]string{"rab", "baz", "bin"})
		assert.EqualValues(t, []string{"rab", "baz", "bin"}, result)

		assert.True(t, iter.Next(), "Next()")
		result = iter.MapUsers([]string{"rab", "baz", "bin"})
		assert.EqualValues(t, []string{"bar", "bin", "foo"}, result)

		assert.True(t, iter.Next(), "Next()")
		result = iter.MapUsers([]string{"rab", "baz", "bin"})
		assert.EqualValues(t, []string{"rab", "baz", "bin"}, result)

	})

}