Add tooltips to the SVG chart with date and amount

pkg/dashboard.go

@@ -8,6 +8,7 @@ import (
 	"math"
 	"net/http"
 	"strings"
+	"time"
 )
 
 const (
@@ -60,7 +61,7 @@ func ServeDashboard(w http.ResponseWriter, r *http.Request, _ httprouter.Params)
 	conn := getConn(r)
 	dashboard := &DashboardPage{
 		Filters: filters,
-		Chart:   buildDashboardChart(r.Context(), conn, company, periodStart, periodEnd, filters.Period.Selected),
+		Chart:   buildDashboardChart(r.Context(), conn, locale, company, periodStart, periodEnd, filters.Period.Selected),
 	}
 	rows := conn.MustQuery(r.Context(), fmt.Sprintf(`
 		select to_price(0, decimal_digits) as sales
@@ -173,17 +174,23 @@ func (form *dashboardFilterForm) Parse(r *http.Request) error {
 	return nil
 }
 
-func buildDashboardChart(ctx context.Context, conn *Conn, company *Company, periodStart string, periodEnd string, selectedPeriod string) template.HTML {
+func buildDashboardChart(ctx context.Context, conn *Conn, locale *Locale, company *Company, periodStart string, periodEnd string, selectedPeriod string) template.HTML {
 	group := "yyyymmdd"
+	dateFormat := "02/01/2006"
 	switch selectedPeriod {
 	case YearPeriod, YesteryearPeriod:
 		group = "yyyymm"
+		dateFormat = "01/2006"
 	}
 	rows := conn.MustQuery(ctx, fmt.Sprintf(`
       select date
+           , to_date(date::text, '%[3]s')
            , 0 as sales
+           , to_price(0, $2) as sales_price
            , coalesce(invoice.total, 0) as income
+           , to_price(coalesce(invoice.total, 0), $2) as income_price
            , coalesce(expense.total, 0) as expenses
+           , to_price(coalesce(expense.total, 0), $2) as expenses_price
       from (
       	select to_char(date.invoice_date, '%[3]s')::integer as date
       	     , sum(total)::integer as total
@@ -200,14 +207,18 @@ func buildDashboardChart(ctx context.Context, conn *Conn, company *Company, peri
             group by date
         ) as expense using (date)
       order by date
-	`, periodStart, periodEnd, group), company.Id)
+	`, periodStart, periodEnd, group), company.Id, company.DecimalDigits)
 	defer rows.Close()
 
 	type value struct {
-		date     int
+		index         int
+		date          time.Time
 		sales         float64
+		salesPrice    string
 		income        float64
+		incomePrice   string
 		expenses      float64
+		expensesPrice string
 	}
 	var values []value
 	var max = 0.
@@ -216,7 +227,7 @@ func buildDashboardChart(ctx context.Context, conn *Conn, company *Company, peri
 		var sales int
 		var income int
 		var expenses int
-		if err := rows.Scan(&v.date, &sales, &income, &expenses); err != nil {
+		if err := rows.Scan(&v.index, &v.date, &sales, &v.salesPrice, &income, &v.incomePrice, &expenses, &v.expensesPrice); err != nil {
 			panic(err)
 		}
 		v.sales = float64(sales)
@@ -240,25 +251,26 @@ func buildDashboardChart(ctx context.Context, conn *Conn, company *Company, peri
 	var sb strings.Builder
 	sb.WriteString(fmt.Sprintf("<svg id='income-chart' viewBox='-10 -10 %d %d'>", int(width)+20, int(height)+20))
 	sb.WriteString("<rect x='-10' y='-10' width='100%', height='100%'/>")
+	writePolyline := func(value func(value) float64) {
 		sb.WriteString("<polyline points='")
 		for i, v := range values {
-		sb.WriteString(fmt.Sprintf(" %f,%f", float64(i)/dataPoints*width, height-v.sales/max*height))
+			sb.WriteString(fmt.Sprintf(" %f,%f", float64(i)/dataPoints*width, height-value(v)/max*height))
 		}
 		sb.WriteString("'/>")
-	sb.WriteString("<polyline points='")
-	for i, v := range values {
-		sb.WriteString(fmt.Sprintf(" %f,%f", float64(i)/dataPoints*width, height-v.income/max*height))
 	}
-	sb.WriteString("'/>")
-	sb.WriteString("<polyline points='")
-	for i, v := range values {
-		sb.WriteString(fmt.Sprintf(" %f,%f", float64(i)/dataPoints*width, height-v.expenses/max*height))
+	writePolyline(func(v value) float64 { return v.sales })
+	writePolyline(func(v value) float64 { return v.income })
+	writePolyline(func(v value) float64 { return v.expenses })
+
+	writeCircle := func(i int, time time.Time, p string, v float64) {
+		price := formatPrice(p, locale.Language, locale.CurrencyPattern, company.DecimalDigits, company.CurrencySymbol)
+		date := time.Format(dateFormat)
+		sb.WriteString(fmt.Sprintf("<circle cx='%f' cy='%f' r='4'><title>%s\n%s</title></circle>", float64(i)/dataPoints*width, height-v/max*height, date, price))
 	}
-	sb.WriteString("'/>")
 	for i, v := range values {
-		sb.WriteString(fmt.Sprintf("<circle cx='%f' cy='%f' r='4'/>", float64(i)/dataPoints*width, height-v.sales/max*height))
-		sb.WriteString(fmt.Sprintf("<circle cx='%f' cy='%f' r='4'/>", float64(i)/dataPoints*width, height-v.income/max*height))
-		sb.WriteString(fmt.Sprintf("<circle cx='%f' cy='%f' r='4'/>", float64(i)/dataPoints*width, height-v.expenses/max*height))
+		writeCircle(i, v.date, v.salesPrice, v.sales)
+		writeCircle(i, v.date, v.incomePrice, v.income)
+		writeCircle(i, v.date, v.expensesPrice, v.expenses)
 	}
 	sb.WriteString("</svg>")
 	return template.HTML(sb.String())