feat(dashboard): #163 first summary

internal/service/dashboard.go

@@ -0,0 +1,88 @@
+package service
+
+import (
+	"context"
+	"log/slog"
+	"spend-sparrow/internal/db"
+	"spend-sparrow/internal/types"
+	"time"
+
+	"github.com/jmoiron/sqlx"
+)
+
+type Dashboard struct {
+	db *sqlx.DB
+}
+
+func NewDashboard(db *sqlx.DB) *Dashboard {
+	return &Dashboard{
+		db: db,
+	}
+}
+
+func (s Dashboard) Summary(ctx context.Context, user *types.User, month time.Time) (*types.DashboardMonthlySummary, error) {
+	if user == nil {
+		return nil, ErrUnauthorized
+	}
+
+	var summary types.DashboardMonthlySummary
+
+	var value *int64
+	err := s.db.GetContext(ctx, &value, `
+		SELECT SUM(value)
+		FROM "transaction"
+		WHERE user_id = $1 
+			AND treasure_chest_id IS NOT NULL
+			AND account_id IS NULL
+			AND error IS NULL
+			AND date(timestamp, 'start of month') = date($2, 'start of month')`,
+		user.Id, month)
+	err = db.TransformAndLogDbError("dashboard", nil, err)
+	if err != nil {
+		return nil, err
+	}
+	if value != nil {
+		summary.Savings = *value
+	}
+
+	err = s.db.GetContext(ctx, &value, `
+		SELECT SUM(value)
+		FROM "transaction"
+		WHERE user_id = $1
+			AND account_id IS NOT NULL
+			AND treasure_chest_id IS NULL
+			AND error IS NULL
+			AND date(timestamp, 'start of month') = date($2, 'start of month')`,
+		user.Id, month)
+	err = db.TransformAndLogDbError("dashboard", nil, err)
+	if err != nil {
+		return nil, err
+	}
+	if value != nil {
+		summary.Income = *value
+	}
+
+	err = s.db.GetContext(ctx, &value, `
+		SELECT SUM(value)
+		FROM "transaction"
+		WHERE user_id = $1
+			AND account_id IS NOT NULL
+			AND treasure_chest_id IS NOT NULL
+			AND error IS NULL
+			AND date(timestamp, 'start of month') = date($2, 'start of month')`,
+		user.Id, month)
+	err = db.TransformAndLogDbError("dashboard", nil, err)
+	if err != nil {
+		return nil, err
+	}
+	if value != nil {
+		summary.Expenses = *value
+	}
+
+	summary.Total = summary.Income + summary.Expenses
+	summary.Month = month
+
+	slog.Info("Dashboard summary", "summary", summary)
+
+	return &summary, nil
+}

internal/service/transaction.go

@@ -512,27 +512,20 @@ func (s TransactionImpl) validateAndEnrichTransaction(ctx context.Context, tx *s
 	return &transaction, nil
 }
 
-func (s TransactionImpl) updateErrors(transaction *types.Transaction) {
+func (s TransactionImpl) updateErrors(t *types.Transaction) {
 	errorStr := ""
 
 	switch {
-	case transaction.Value < 0:
-		if transaction.TreasureChestId == nil {
-			errorStr = "no treasure chest specified"
-		}
-	case transaction.Value > 0:
-		if transaction.AccountId == nil && transaction.TreasureChestId == nil {
-			errorStr = "either an account or a treasure chest needs to be specified"
-		} else if transaction.AccountId != nil && transaction.TreasureChestId != nil {
-			errorStr = "positive amounts can only be applied to either an account or a treasure chest"
-		}
-	default:
+	case (t.AccountId != nil && t.TreasureChestId != nil && t.Value > 0) ||
+		(t.AccountId == nil && t.TreasureChestId == nil):
+		errorStr = "either an account or a treasure chest needs to be specified"
+	case t.Value == 0:
 		errorStr = "\"value\" needs to be specified"
 	}
 
 	if errorStr == "" {
-		transaction.Error = nil
+		t.Error = nil
 	} else {
-		transaction.Error = &errorStr
+		t.Error = &errorStr
 	}
 }