package meta_test

import (
	"testing"

	"git.bit5.ru/backend/meta"

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

func TestFieldsMask(t *testing.T) {
	t.Run("IsFilled", func(t *testing.T) {
		t.Run("default value", func(t *testing.T) {
			var mask meta.FieldsMask

			actualIsFilled := mask.IsFilled()
			require.False(t, actualIsFilled)
		})
		t.Run("filled value", func(t *testing.T) {
			var mask meta.FieldsMask
			mask.SetPartFromInt64(0, 1)

			actualIsFilled := mask.IsFilled()
			require.True(t, actualIsFilled)
		})
	})

	t.Run("FieldChanged", func(t *testing.T) {
		t.Run("field not changed", func(t *testing.T) {
			var mask meta.FieldsMask
			var fieldIndex uint64 = 4

			fieldChanged := mask.FieldChanged(fieldIndex)
			require.False(t, fieldChanged)
		})
		t.Run("filled changed #1", func(t *testing.T) {
			var mask meta.FieldsMask
			var fieldIndex uint64 = 4

			mask.SetPartFromInt64(0, 16)

			fieldChanged := mask.FieldChanged(fieldIndex)
			require.True(t, fieldChanged)
		})
		t.Run("filled changed #2", func(t *testing.T) {
			var mask meta.FieldsMask
			var fieldIndex uint64 = 68

			mask.SetPartFromInt64(1, 16)

			fieldChanged := mask.FieldChanged(fieldIndex)
			require.True(t, fieldChanged)
		})
		t.Run("filled changed #3", func(t *testing.T) {
			var mask meta.FieldsMask
			var fieldIndex uint64 = 131

			mask.SetPartFromInt64(2, 8)

			fieldChanged := mask.FieldChanged(fieldIndex)
			require.True(t, fieldChanged)
		})
		t.Run("filled changed #4", func(t *testing.T) {
			var mask meta.FieldsMask
			var fieldIndex uint64 = 194

			mask.SetPartFromInt64(3, 4)

			fieldChanged := mask.FieldChanged(fieldIndex)
			require.True(t, fieldChanged)
		})
	})
}

func TestFieldsMaskItem(t *testing.T) {
	t.Run("FieldIsDirty", func(t *testing.T) {
		cases := []struct {
			maskItem             meta.FieldsMaskPart
			expectedDirtyIndexes []uint64
		}{
			{
				maskItem:             0,
				expectedDirtyIndexes: []uint64{},
			},
			{
				maskItem:             1, // 0b0001
				expectedDirtyIndexes: []uint64{0},
			},
			{
				maskItem:             2, // 0b0010
				expectedDirtyIndexes: []uint64{1},
			},
			{
				maskItem:             10, // 0b1010
				expectedDirtyIndexes: []uint64{1, 3},
			},
			{
				maskItem:             11, // 0b1011
				expectedDirtyIndexes: []uint64{0, 1, 3},
			},
		}

		for i, c := range cases {
			actualDirtyIndexes := make([]uint64, 0, meta.FieldsMaskPartBitSize)
			for j := uint64(0); j < meta.FieldsMaskPartBitSize; j++ {
				if c.maskItem.FieldIsDirty(j) {
					actualDirtyIndexes = append(actualDirtyIndexes, j)
				}
			}

			assert.Equalf(t, c.expectedDirtyIndexes, actualDirtyIndexes, "case #%d", i)
		}
	})
}