internal/kind.go

@@ -0,0 +1,29 @@
+package internal
+
+type Kind uint
+
+const (
+	KindUnknown Kind = iota
+	KindBuy
+	KindSell
+	KindSplit
+)
+
+// String returns a human readable value
+func (d Kind) String() string {
+	switch d {
+	case KindBuy:
+		return "buy"
+	case KindSell:
+		return "sell"
+	case KindSplit:
+		return "split"
+	default:
+		return "unknown"
+	}
+}
+
+// Is returns true when k equals o
+func (k Kind) Is(o Kind) bool {
+	return k == o
+}

internal/kind_test.go

@@ -5,12 +5,12 @@ import "testing"
 func TestSide_String(t *testing.T) {
 	tests := []struct {
 		name string
-		side Side
+		side Kind
 		want string
 	}{
-		{"buy", SideBuy, "buy"},
-		{"sell", SideSell, "sell"},
-		{"unknown", SideUnknown, "unknown"},
+		{"buy", KindBuy, "buy"},
+		{"sell", KindSell, "sell"},
+		{"unknown", KindUnknown, "unknown"},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -24,16 +24,16 @@ func TestSide_String(t *testing.T) {
 func TestSide_IsBuy(t *testing.T) {
 	tests := []struct {
 		name string
-		side Side
+		side Kind
 		want bool
 	}{
-		{"buy", SideBuy, true},
-		{"sell", SideSell, false},
-		{"unknown", SideUnknown, false},
+		{"buy", KindBuy, true},
+		{"sell", KindSell, false},
+		{"unknown", KindUnknown, false},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := tt.side.IsBuy(); got != tt.want {
+			if got := tt.side.Is(KindBuy); got != tt.want {
 				t.Errorf("want Side.IsBuy() to be %v but got %v", tt.want, got)
 			}
 		})
@@ -43,16 +43,16 @@ func TestSide_IsBuy(t *testing.T) {
 func TestSide_IsSell(t *testing.T) {
 	tests := []struct {
 		name string
-		side Side
+		side Kind
 		want bool
 	}{
-		{"buy", SideBuy, false},
-		{"sell", SideSell, true},
-		{"unknown", SideUnknown, false},
+		{"buy", KindBuy, false},
+		{"sell", KindSell, true},
+		{"unknown", KindUnknown, false},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			if got := tt.side.IsSell(); got != tt.want {
+			if got := tt.side.Is(KindSell); got != tt.want {
 				t.Errorf("want Side.IsSell() to be %v but got %v", tt.want, got)
 			}
 		})

internal/mocks/mocks_gen.go

@@ -220,6 +220,44 @@ func (c *MockRecordFeesCall) DoAndReturn(f func() decimal.Decimal) *MockRecordFe
 	return c
 }
 
+// Kind mocks base method.
+func (m *MockRecord) Kind() internal.Kind {
+	m.ctrl.T.Helper()
+	ret := m.ctrl.Call(m, "Kind")
+	ret0, _ := ret[0].(internal.Kind)
+	return ret0
+}
+
+// Kind indicates an expected call of Kind.
+func (mr *MockRecordMockRecorder) Kind() *MockRecordKindCall {
+	mr.mock.ctrl.T.Helper()
+	call := mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Kind", reflect.TypeOf((*MockRecord)(nil).Kind))
+	return &MockRecordKindCall{Call: call}
+}
+
+// MockRecordKindCall wrap *gomock.Call
+type MockRecordKindCall struct {
+	*gomock.Call
+}
+
+// Return rewrite *gomock.Call.Return
+func (c *MockRecordKindCall) Return(arg0 internal.Kind) *MockRecordKindCall {
+	c.Call = c.Call.Return(arg0)
+	return c
+}
+
+// Do rewrite *gomock.Call.Do
+func (c *MockRecordKindCall) Do(f func() internal.Kind) *MockRecordKindCall {
+	c.Call = c.Call.Do(f)
+	return c
+}
+
+// DoAndReturn rewrite *gomock.Call.DoAndReturn
+func (c *MockRecordKindCall) DoAndReturn(f func() internal.Kind) *MockRecordKindCall {
+	c.Call = c.Call.DoAndReturn(f)
+	return c
+}
+
 // Nature mocks base method.
 func (m *MockRecord) Nature() internal.Nature {
 	m.ctrl.T.Helper()
@@ -334,44 +372,6 @@ func (c *MockRecordQuantityCall) DoAndReturn(f func() decimal.Decimal) *MockReco
 	return c
 }
 
-// Side mocks base method.
-func (m *MockRecord) Side() internal.Side {
-	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "Side")
-	ret0, _ := ret[0].(internal.Side)
-	return ret0
-}
-
-// Side indicates an expected call of Side.
-func (mr *MockRecordMockRecorder) Side() *MockRecordSideCall {
-	mr.mock.ctrl.T.Helper()
-	call := mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "Side", reflect.TypeOf((*MockRecord)(nil).Side))
-	return &MockRecordSideCall{Call: call}
-}
-
-// MockRecordSideCall wrap *gomock.Call
-type MockRecordSideCall struct {
-	*gomock.Call
-}
-
-// Return rewrite *gomock.Call.Return
-func (c *MockRecordSideCall) Return(arg0 internal.Side) *MockRecordSideCall {
-	c.Call = c.Call.Return(arg0)
-	return c
-}
-
-// Do rewrite *gomock.Call.Do
-func (c *MockRecordSideCall) Do(f func() internal.Side) *MockRecordSideCall {
-	c.Call = c.Call.Do(f)
-	return c
-}
-
-// DoAndReturn rewrite *gomock.Call.DoAndReturn
-func (c *MockRecordSideCall) DoAndReturn(f func() internal.Side) *MockRecordSideCall {
-	c.Call = c.Call.DoAndReturn(f)
-	return c
-}
-
 // Symbol mocks base method.
 func (m *MockRecord) Symbol() string {
 	m.ctrl.T.Helper()

internal/report.go

@@ -16,7 +16,7 @@ type Record interface {
 	Nature() Nature
 	BrokerCountry() int64
 	AssetCountry() int64
-	Side() Side
+	Kind() Kind
 	Price() decimal.Decimal
 	Quantity() decimal.Decimal
 	Timestamp() time.Time
@@ -83,9 +83,9 @@ func BuildReport(ctx context.Context, reader RecordReader, writer ReportWriter,
 				return err
 			}
 
-			if rec.Side().IsBuy() {
+			if rec.Kind().Is(KindBuy) {
 				buysCount++
-			} else {
+			} else if rec.Kind().Is(KindSell) {
 				sellsCount++
 			}
 
@@ -108,23 +108,23 @@ func BuildReport(ctx context.Context, reader RecordReader, writer ReportWriter,
 
 // processRecord either adds buys to the queue or consumes buys from the queue when processing a
 // sell record.
-// Selectors are only applied for sells for performance reasons. It's much cheaper to just accumulate
-// buys and only actually inspect a record once a sell happens
+// Selectors are only applied on sells for performance reasons. It's much cheaper to just accumulate
+// buys and only actually inspect a record once a sell happens due to potential network requests to
 func processRecord(ctx context.Context, q *FillerQueue, rec Record, sel Selector, writer ReportWriter) error {
 	slog.Debug("Report: processing record",
 		slog.String("symbol", rec.Symbol()),
-		slog.String("side", rec.Side().String()),
+		slog.String("side", rec.Kind().String()),
 	)
 
-	switch rec.Side() {
-	case SideBuy:
+	switch rec.Kind() {
+	case KindBuy:
 		q.Push(NewFiller(rec))
 
-	case SideSell:
+	case KindSell:
 		if !sel(rec) {
 			slog.Debug("Report: skipping record",
 				slog.String("symbol", rec.Symbol()),
-				slog.String("side", rec.Side().String()),
+				slog.String("side", rec.Kind().String()),
 			)
 			return nil
 		}
@@ -169,7 +169,7 @@ func processRecord(ctx context.Context, q *FillerQueue, rec Record, sel Selector
 		}
 
 	default:
-		return fmt.Errorf("unknown side: %v", rec.Side())
+		return fmt.Errorf("unknown side: %v", rec.Kind())
 	}
 
 	return nil

internal/report_test.go

@@ -20,8 +20,8 @@ func TestBuildReport(t *testing.T) {
 
 	reader := mocks.NewMockRecordReader(ctrl)
 	records := []internal.Record{
-		mockRecord(ctrl, 20.0, 10.0, internal.SideBuy, now),
-		mockRecord(ctrl, 25.0, 10.0, internal.SideSell, now.Add(1)),
+		mockRecord(ctrl, 20.0, 10.0, internal.KindBuy, now),
+		mockRecord(ctrl, 25.0, 10.0, internal.KindSell, now.Add(1)),
 	}
 	reader.EXPECT().ReadRecord(gomock.Any()).DoAndReturn(func(ctx context.Context) (internal.Record, error) {
 		if len(records) > 0 {
@@ -49,14 +49,14 @@ func TestBuildReport(t *testing.T) {
 	}
 }
 
-func mockRecord(ctrl *gomock.Controller, price, quantity float64, side internal.Side, ts time.Time) *mocks.MockRecord {
+func mockRecord(ctrl *gomock.Controller, price, quantity float64, kind internal.Kind, ts time.Time) *mocks.MockRecord {
 	rec := mocks.NewMockRecord(ctrl)
 	rec.EXPECT().Symbol().Return("TEST").AnyTimes()
 	rec.EXPECT().BrokerCountry().Return(int64(countries.PT)).AnyTimes()
 	rec.EXPECT().AssetCountry().Return(int64(countries.USA)).AnyTimes()
 	rec.EXPECT().Price().Return(decimal.NewFromFloat(price)).AnyTimes()
 	rec.EXPECT().Quantity().Return(decimal.NewFromFloat(quantity)).AnyTimes()
-	rec.EXPECT().Side().Return(side).AnyTimes()
+	rec.EXPECT().Kind().Return(kind).AnyTimes()
 	rec.EXPECT().Timestamp().Return(ts).AnyTimes()
 	rec.EXPECT().Fees().Return(decimal.Decimal{}).AnyTimes()
 	rec.EXPECT().Taxes().Return(decimal.Decimal{}).AnyTimes()

internal/selectors_test.go

@@ -13,7 +13,7 @@ type testRecord struct {
 	nature        internal.Nature
 	brokerCountry int64
 	assetCountry  int64
-	side         internal.Side
+	side          internal.Kind
 	price         decimal.Decimal
 	quantity      decimal.Decimal
 	timestamp     time.Time
@@ -25,7 +25,7 @@ func (m testRecord) Symbol() string                { return m.symbol }
 func (m testRecord) Nature() internal.Nature   { return m.nature }
 func (m testRecord) BrokerCountry() int64      { return m.brokerCountry }
 func (m testRecord) AssetCountry() int64       { return m.assetCountry }
-func (m testRecord) Side() internal.Side           { return m.side }
+func (m testRecord) Kind() internal.Kind       { return m.side }
 func (m testRecord) Price() decimal.Decimal    { return m.price }
 func (m testRecord) Quantity() decimal.Decimal { return m.quantity }
 func (m testRecord) Timestamp() time.Time      { return m.timestamp }

internal/side.go

@@ -1,30 +0,0 @@
-package internal
-
-type Side uint
-
-const (
-	SideUnknown Side = iota
-	SideBuy
-	SideSell
-)
-
-func (d Side) String() string {
-	switch d {
-	case SideBuy:
-		return "buy"
-	case SideSell:
-		return "sell"
-	default:
-		return "unknown"
-	}
-}
-
-// IsBuy returns true if the s == SideBuy
-func (d Side) IsBuy() bool {
-	return d == SideBuy
-}
-
-// IsSell returns true if the s == SideSell
-func (d Side) IsSell() bool {
-	return d == SideSell
-}

internal/trading212/record.go

@@ -18,7 +18,7 @@ import (
 type Record struct {
 	symbol    string
 	timestamp time.Time
-	side      internal.Side
+	side      internal.Kind
 	quantity  decimal.Decimal
 	price     decimal.Decimal
 	fees      decimal.Decimal
@@ -44,7 +44,7 @@ func (r Record) AssetCountry() int64 {
 	return int64(countries.ByName(r.Symbol()[:2]).Info().Code)
 }
 
-func (r Record) Side() internal.Side {
+func (r Record) Kind() internal.Kind {
 	return r.side
 }
 
@@ -85,6 +85,8 @@ const (
 	MarketSell      = "market sell"
 	LimitBuy        = "limit buy"
 	LimitSell       = "limit sell"
+	StockSplitOpen  = "Stock split open"
+	StockSplitClose = "Stock split close"
 )
 
 func (rr RecordReader) ReadRecord(ctx context.Context) (internal.Record, error) {
@@ -94,13 +96,16 @@ func (rr RecordReader) ReadRecord(ctx context.Context) (internal.Record, error)
 			return Record{}, fmt.Errorf("read record: %w", err)
 		}
 
-		var side internal.Side
+		var side internal.Kind
 		switch strings.ToLower(raw[0]) {
 		case MarketBuy, LimitBuy:
-			side = internal.SideBuy
+			side = internal.KindBuy
 		case MarketSell, LimitSell:
-			side = internal.SideSell
-		case "action", "stock split open", "stock split close":
+			side = internal.KindSell
+		case StockSplitOpen, StockSplitClose:
+			// TODO: emit a special event that triggers a readjustment of unsold stock
+			continue
+		case "action": // TODO: this is the header, there's probably a better way to handle this
 			continue
 		default:
 			return Record{}, fmt.Errorf("parse record type: %s", raw[0])

internal/trading212/record_test.go

@@ -30,7 +30,7 @@ func TestRecordReader_ReadRecord(t *testing.T) {
 			r:    bytes.NewBufferString(`Market buy,2025-07-03 10:44:29,XX1234567890,ABXY,"Aspargus Broccoli",EOF987654321,2.4387014200,7.3690000000,USD,1.17995999,,"EUR",15.25,"EUR",0.25,"EUR",0.02,"EUR",,`),
 			want: Record{
 				symbol:       "XX1234567890",
-				side:         internal.SideBuy,
+				side:         internal.KindBuy,
 				quantity:     ShouldParseDecimal(t, "2.4387014200"),
 				price:        ShouldParseDecimal(t, "7.3690000000"),
 				timestamp:    time.Date(2025, 7, 3, 10, 44, 29, 0, time.UTC),
@@ -44,7 +44,7 @@ func TestRecordReader_ReadRecord(t *testing.T) {
 			r:    bytes.NewBufferString(`Market sell,2025-08-04 11:45:30,XX1234567890,ABXY,"Aspargus Broccoli",EOF987654321,2.4387014200,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",0.1,"EUR"`),
 			want: Record{
 				symbol:       "XX1234567890",
-				side:         internal.SideSell,
+				side:         internal.KindSell,
 				quantity:     ShouldParseDecimal(t, "2.4387014200"),
 				price:        ShouldParseDecimal(t, "7.9999999999"),
 				timestamp:    time.Date(2025, 8, 4, 11, 45, 30, 0, time.UTC),
@@ -123,8 +123,8 @@ func TestRecordReader_ReadRecord(t *testing.T) {
 				t.Fatalf("want symbol %v but got %v", tt.want.symbol, got.Symbol())
 			}
 
-			if got.Side() != tt.want.side {
-				t.Fatalf("want side %v but got %v", tt.want.side, got.Side())
+			if got.Kind() != tt.want.side {
+				t.Fatalf("want side %v but got %v", tt.want.side, got.Kind())
 			}
 
 			if got.Price().Cmp(tt.want.price) != 0 {