feat(invoice): add send route

pkg/invoice/report/template.go

@@ -0,0 +1,71 @@
+package report
+
+import (
+	"bytes"
+	_ "embed"
+	"fmt"
+	"html/template"
+	"math"
+	"time"
+)
+
+//go:embed assets/template.html
+var htmlTemplate string
+
+//go:embed assets/style.css
+var style template.CSS
+
+type tmpler struct {
+	Report
+	Style template.CSS
+}
+
+func (r Report) ToHTML() (html string, err error) {
+	tmpl := template.Must(
+		template.New("report").Funcs(template.FuncMap{
+			"md":       mdToHTML,
+			"oh":       offsetHTags,
+			"price":    r.applyRate,
+			"time":     fmtDateTime,
+			"date":     fmtDate,
+			"duration": fmtDuration,
+		}).Parse(htmlTemplate))
+
+	buf := new(bytes.Buffer)
+
+	err = tmpl.Execute(buf, tmpler{r, style})
+	if err != nil {
+		return
+	}
+
+	html = buf.String()
+	return
+}
+
+func (r Report) applyRate(dur time.Duration) string {
+	cost := dur.Hours() * r.Rate
+	cost = math.Round(cost/0.05) * 0.05
+	return fmt.Sprintf("%.2f", cost)
+}
+
+func fmtDateTime(t time.Time) string {
+	return t.Format("02.08.2006 15:04")
+}
+
+func fmtDate(t time.Time) string {
+	return t.Format("02.08.2006")
+}
+
+func fmtDuration(d time.Duration) string {
+	return fmt.Sprintf("%.2f h", d.Hours())
+}
+
+func (r Report) Total() time.Duration {
+	dur := time.Duration(0)
+
+	for _, i := range r.Issues {
+		dur += i.Duration
+	}
+
+	return dur
+}