Projeto bot pontos

backend/internal/domain/clock.go

@@ -0,0 +1,54 @@
+package domain
+
+import (
+	"fmt"
+	"time"
+)
+
+// ClockTime é um horário do dia (HH:MM), guardado em minutos desde 00:00.
+type ClockTime int
+
+func ParseClock(value string) (ClockTime, error) {
+	if len(value) != 5 || value[2] != ':' {
+		return 0, fmt.Errorf("horário inválido %q (use HH:MM)", value)
+	}
+	digits := [4]byte{value[0], value[1], value[3], value[4]}
+	for _, d := range digits {
+		if d < '0' || d > '9' {
+			return 0, fmt.Errorf("horário inválido %q (use HH:MM)", value)
+		}
+	}
+	hour := int(digits[0]-'0')*10 + int(digits[1]-'0')
+	minute := int(digits[2]-'0')*10 + int(digits[3]-'0')
+	if hour > 23 || minute > 59 {
+		return 0, fmt.Errorf("horário inválido %q", value)
+	}
+	return ClockTime(hour*60 + minute), nil
+}
+
+func MustParseClock(value string) ClockTime {
+	c, err := ParseClock(value)
+	if err != nil {
+		panic(err)
+	}
+	return c
+}
+
+func (c ClockTime) String() string {
+	return fmt.Sprintf("%02d:%02d", int(c)/60, int(c)%60)
+}
+
+// On devolve o instante desse horário na data (AAAA-MM-DD) e fuso informados.
+func (c ClockTime) On(day string, loc *time.Location) time.Time {
+	date, err := time.ParseInLocation(DateLayout, day, loc)
+	if err != nil {
+		return time.Time{}
+	}
+	return time.Date(date.Year(), date.Month(), date.Day(), int(c)/60, int(c)%60, 0, 0, loc)
+}
+
+// ClockOf devolve o horário do dia de t no fuso informado.
+func ClockOf(t time.Time, loc *time.Location) ClockTime {
+	local := t.In(loc)
+	return ClockTime(local.Hour()*60 + local.Minute())
+}