feat: locking days, if they are submitted and accepted

fixed #76

Backend/models/absence.go

@@ -13,8 +13,10 @@ package models
 // the absence data is based on the entries in the "abwesenheit" database table
 
 import (
+	"database/sql"
 	"encoding/json"
 	"log"
+	"log/slog"
 	"time"
 )
 
@@ -295,3 +297,24 @@ func (a *Absence) Delete() error {
 	_, err = qStr.Exec(a.CounterId)
 	return err
 }
+
+func (a *Absence) IsSubmittedAndAccepted() bool {
+	qStr, err := DB.Prepare(`SELECT bestaetigt from wochen_report WHERE $1 = ANY(abwesenheiten) AND $2 >= woche_start AND $2 <  woche_start + INTERVAL '1 week';`) // @> array contains
+	if err != nil {
+		slog.Warn("Error when preparing SQL Statement", "error", err)
+		return false
+	}
+	defer qStr.Close()
+	var isSubmittedAndChecked bool = false
+
+	err = qStr.QueryRow(a.CounterId, a.Date()).Scan(&isSubmittedAndChecked)
+	if err == sql.ErrNoRows {
+		// No rows found ==> not even submitted
+		return false
+	}
+
+	if err != nil {
+		slog.Warn("Unexpected error when executing SQL Statement", "error", err)
+	}
+	return isSubmittedAndChecked
+}