separate trading212 logic

internal/direction.go

@@ -0,0 +1,28 @@
+package internal
+
+type Direction uint
+
+const (
+	DirectionUnknown Direction = 0
+	DirectionBuy     Direction = 1
+	DirectionSell    Direction = 2
+)
+
+func (d Direction) String() string {
+	switch d {
+	case 1:
+		return "buy"
+	case 2:
+		return "sell"
+	default:
+		return "unknown"
+	}
+}
+
+func (d Direction) IsBuy() bool {
+	return d == DirectionBuy
+}
+
+func (d Direction) IsSell() bool {
+	return d == DirectionSell
+}

internal/direction_test.go

@@ -0,0 +1,60 @@
+package internal
+
+import "testing"
+
+func TestDirection_String(t *testing.T) {
+	tests := []struct {
+		name string
+		d    Direction
+		want string
+	}{
+		{"buy", DirectionBuy, "buy"},
+		{"sell", DirectionSell, "sell"},
+		{"unknown", DirectionUnknown, "unknown"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.d.String(); got != tt.want {
+				t.Errorf("want Direction.String() to be %v but got %v", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestDirection_IsBuy(t *testing.T) {
+	tests := []struct {
+		name string
+		d    Direction
+		want bool
+	}{
+		{"buy", DirectionBuy, true},
+		{"sell", DirectionSell, false},
+		{"unknown", DirectionUnknown, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.d.IsBuy(); got != tt.want {
+				t.Errorf("want Direction.IsBuy() to be %v but got %v", tt.want, got)
+			}
+		})
+	}
+}
+
+func TestDirection_IsSell(t *testing.T) {
+	tests := []struct {
+		name string
+		d    Direction
+		want bool
+	}{
+		{"buy", DirectionBuy, false},
+		{"sell", DirectionSell, true},
+		{"unknown", DirectionUnknown, false},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.d.IsSell(); got != tt.want {
+				t.Errorf("want Direction.IsSell() to be %v but got %v", tt.want, got)
+			}
+		})
+	}
+}

internal/record.go

@@ -0,0 +1,18 @@
+package internal
+
+import (
+	"math/big"
+	"time"
+)
+
+type Record interface {
+	Symbol() string
+	Price() *big.Float
+	Quantity() *big.Float
+	Direction() Direction
+	Timestamp() time.Time
+}
+
+type RecordReader interface {
+	ReadRecord() (Record, error)
+}

internal/trading212/record.go

@@ -0,0 +1,108 @@
+package trading212
+
+import (
+	"encoding/csv"
+	"fmt"
+	"io"
+	"math/big"
+	"strings"
+	"time"
+
+	"git.naterciomoniz.net/applications/broker2anexoj/internal"
+)
+
+type Record struct {
+	symbol    string
+	direction internal.Direction
+	quantity  *big.Float
+	price     *big.Float
+	timestamp time.Time
+}
+
+func (r Record) Symbol() string {
+	return r.symbol
+}
+
+func (r Record) Direction() internal.Direction {
+	return r.direction
+}
+
+func (r Record) Quantity() *big.Float {
+	return r.quantity
+}
+
+func (r Record) Price() *big.Float {
+	return r.price
+}
+
+func (r Record) Timestamp() time.Time {
+	return r.timestamp
+}
+
+type RecordReader struct {
+	reader *csv.Reader
+}
+
+func NewRecordReader(r io.Reader) *RecordReader {
+	return &RecordReader{
+		reader: csv.NewReader(r),
+	}
+}
+
+const (
+	MarketBuy  = "market buy"
+	MarketSell = "market sell"
+	LimitBuy   = "limit buy"
+	LimitSell  = "limit sell"
+)
+
+func (rr RecordReader) ReadRecord() (Record, error) {
+	for {
+		raw, err := rr.reader.Read()
+		if err != nil {
+			return Record{}, fmt.Errorf("read record: %w", err)
+		}
+
+		var dir internal.Direction
+		switch strings.ToLower(raw[0]) {
+		case MarketBuy, LimitBuy:
+			dir = internal.DirectionBuy
+		case MarketSell, LimitSell:
+			dir = internal.DirectionSell
+		case "action", "stock split open", "stock split close":
+			continue
+		default:
+			return Record{}, fmt.Errorf("parse record type: %s", raw[0])
+		}
+
+		qant, err := parseDecimal(raw[6])
+		if err != nil {
+			return Record{}, fmt.Errorf("parse record quantity: %w", err)
+		}
+
+		price, err := parseDecimal(raw[7])
+		if err != nil {
+			return Record{}, fmt.Errorf("parse record price: %w", err)
+		}
+
+		ts, err := time.Parse(time.DateTime, raw[1])
+		if err != nil {
+			return Record{}, fmt.Errorf("parse record timestamp: %w", err)
+		}
+
+		return Record{
+			symbol:    raw[2],
+			direction: dir,
+			quantity:  qant,
+			price:     price,
+			timestamp: ts,
+		}, nil
+	}
+}
+
+// parseFloat attempts to parse a string using a standard precision and rounding mode.
+// Using this function helps avoid issues around converting values due to sligh parameter changes.
+func parseDecimal(s string) (*big.Float, error) {
+	f, _, err := big.ParseFloat(s, 10, 128, big.ToZero)
+	return f, err
+}

internal/trading212/record_test.go

@@ -0,0 +1,145 @@
+package trading212
+
+import (
+	"bytes"
+	"io"
+	"math/big"
+	"testing"
+	"time"
+
+	"git.naterciomoniz.net/applications/broker2anexoj/internal"
+)
+
+func TestRecordReader_ReadRecord(t *testing.T) {
+	tests := []struct {
+		name    string
+		r       io.Reader
+		want    Record
+		wantErr bool
+	}{
+		{
+			name:    "empty reader",
+			r:       bytes.NewBufferString(""),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name: "well formed buy",
+			r:    bytes.NewBufferString(`Market buy,2025-07-03 10:44:29,SYM123456ABXY,ABXY,"Aspargus Brocoli",EOF987654321,2.4387014200,7.3690000000,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want: Record{
+				symbol:    "SYM123456ABXY",
+				direction: internal.DirectionBuy,
+				quantity:  ShouldParseDecimal(t, "2.4387014200"),
+				price:     ShouldParseDecimal(t, "7.3690000000"),
+				timestamp: time.Date(2025, 7, 3, 10, 44, 29, 0, time.UTC),
+			},
+			wantErr: false,
+		},
+		{
+			name: "well formed sell",
+			r:    bytes.NewBufferString(`Market sell,2025-08-04 11:45:30,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,2.4387014200,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want: Record{
+				symbol:    "IE000GA3D489",
+				direction: internal.DirectionSell,
+				quantity:  ShouldParseDecimal(t, "2.4387014200"),
+				price:     ShouldParseDecimal(t, "7.9999999999"),
+				timestamp: time.Date(2025, 8, 4, 11, 45, 30, 0, time.UTC),
+			},
+			wantErr: false,
+		},
+		{
+			name:    "malformed direction",
+			r:       bytes.NewBufferString(`Aljksdaf Balsjdkf,2025-08-04 11:45:39,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,2.4387014200,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name:    "empty direction",
+			r:       bytes.NewBufferString(`,2025-08-04 11:45:39,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,0x1234,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name:    "malformed qantity",
+			r:       bytes.NewBufferString(`Market sell,2025-08-04 11:45:39,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,0x1234,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name:    "empty qantity",
+			r:       bytes.NewBufferString(`Market sell,2025-08-04 11:45:39,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name:    "malformed price",
+			r:       bytes.NewBufferString(`Market sell,2025-08-04 11:45:39,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,2.4387014200,0b101010,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name:    "empty price",
+			r:       bytes.NewBufferString(`Market sell,2025-08-04 11:45:39,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,2.4387014200,,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name:    "malformed timestamp",
+			r:       bytes.NewBufferString(`Market sell,2006-01-02T15:04:05Z07:00,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,2.4387014200,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+		{
+			name:    "empty timestamp",
+			r:       bytes.NewBufferString(`Market sell,,IE000GA3D489,ABXY,"Aspargus Brocoli",EOF987654321,2.4387014200,7.9999999999,USD,1.17995999,,"EUR",15.25,"EUR",,,0.02,"EUR",,`),
+			want:    Record{},
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			rr := NewRecordReader(tt.r)
+			got, gotErr := rr.ReadRecord()
+			if gotErr != nil {
+				if !tt.wantErr {
+					t.Fatalf("ReadRecord() failed: %v", gotErr)
+				}
+				return
+			}
+
+			if tt.wantErr {
+				t.Fatalf("ReadRecord() expected an error")
+			}
+
+			if got.symbol != tt.want.symbol {
+				t.Fatalf("want symbol %v but got %v", tt.want.symbol, got.symbol)
+			}
+
+			if got.direction != tt.want.direction {
+				t.Fatalf("want direction %v but got %v", tt.want.direction, got.direction)
+			}
+
+			if got.price.Cmp(tt.want.price) != 0 {
+				t.Fatalf("want price %v but got %v", tt.want.price, got.price)
+			}
+
+			if got.quantity.Cmp(tt.want.quantity) != 0 {
+				t.Fatalf("want quantity %v but got %v", tt.want.quantity, got.quantity)
+			}
+
+			if !got.timestamp.Equal(tt.want.timestamp) {
+				t.Fatalf("want timestamp %v but got %v", tt.want.timestamp, got.timestamp)
+			}
+		})
+	}
+}
+
+func ShouldParseDecimal(t testing.TB, sf string) *big.Float {
+	t.Helper()
+
+	bf, err := parseDecimal(sf)
+	if err != nil {
+		t.Fatalf("parsing decimal: %s", sf)
+	}
+	return bf
+}