mirror of
https://gitlab.dit.htwk-leipzig.de/htwk-software/htwkalender-pwa.git
synced 2025-07-16 09:38:51 +02:00
87 lines
2.9 KiB
Go
87 lines
2.9 KiB
Go
//Calendar implementation for the HTWK Leipzig timetable. Evaluation and display of the individual dates in iCal format.
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//Copyright (C) 2024 HTWKalender support@htwkalender.de
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//This program is free software: you can redistribute it and/or modify
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//it under the terms of the GNU Affero General Public License as published by
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//the Free Software Foundation, either version 3 of the License, or
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//(at your option) any later version.
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU Affero General Public License for more details.
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//You should have received a copy of the GNU Affero General Public License
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//along with this program. If not, see <https://www.gnu.org/licenses/>.
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package date
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import (
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"log/slog"
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"strconv"
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"strings"
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"time"
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_ "time/tzdata"
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)
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func GetDateFromWeekNumber(year int, weekNumber int, dayName string) (time.Time, error) {
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// Create a time.Date for the first day of the year
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europeTime, err := time.LoadLocation("Europe/Berlin")
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if err != nil {
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slog.Error("Failed to load location: ", "error", err)
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return time.Time{}, err
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}
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firstDayOfYear := time.Date(year, time.January, 1, 0, 0, 0, 0, europeTime)
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// Calculate the number of days to add to reach the desired week
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daysToAdd := time.Duration((weekNumber-1)*7) * 24 * time.Hour
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// Find the starting day of the week (e.g., Monday)
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startingDayOfWeek := firstDayOfYear
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// check if the first day of the year is friday or saturday or sunday
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if startingDayOfWeek.Weekday() == time.Friday || startingDayOfWeek.Weekday() == time.Saturday || startingDayOfWeek.Weekday() == time.Sunday {
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for startingDayOfWeek.Weekday() != time.Monday {
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startingDayOfWeek = startingDayOfWeek.Add(24 * time.Hour)
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}
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} else {
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for startingDayOfWeek.Weekday() != time.Monday {
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startingDayOfWeek = startingDayOfWeek.Add(-24 * time.Hour)
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}
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}
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// Calculate the desired date by adding daysToAdd and adjusting for the day name
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desiredDate := startingDayOfWeek.Add(daysToAdd)
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// Find the day of the week
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dayOfWeek := map[string]time.Weekday{
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"Montag": time.Monday,
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"Dienstag": time.Tuesday,
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"Mittwoch": time.Wednesday,
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"Donnerstag": time.Thursday,
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"Freitag": time.Friday,
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"Samstag": time.Saturday,
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"Sonntag": time.Sunday,
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}[dayName]
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// Adjust to the desired day of the week
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for desiredDate.Weekday() != dayOfWeek {
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desiredDate = desiredDate.Add(24 * time.Hour)
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}
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return desiredDate, nil
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}
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// createEventFromTableData should create an event from the table data
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// tableTime represents Hour and Minute like HH:MM
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// tableDate returns a Time
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func CreateTimeFromHourAndMinuteString(tableTime string) time.Time {
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timeParts := strings.Split(tableTime, ":")
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hour, _ := strconv.Atoi(timeParts[0])
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minute, _ := strconv.Atoi(timeParts[1])
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return time.Date(0, 0, 0, hour, minute, 0, 0, time.UTC)
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}
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