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
+}