sprechstunden-go/repositories/officeHour.go

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// officeHour
package repositories
import (
"database/sql"
"errors"
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"fmt"
"log"
"officeHours/config"
"officeHours/models"
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)
type OfficeHourRepo struct {
db *sql.DB
roomRepo *RoomRepo
tutorRepo *TutorRepo
courseRepo *CourseRepo
config config.Config
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}
func NewOfficeHourRepo(db *sql.DB, roomRepo *RoomRepo, tutorRepo *TutorRepo, courseRepo *CourseRepo, conf config.Config) *OfficeHourRepo {
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return &OfficeHourRepo{
db: db,
roomRepo: roomRepo,
tutorRepo: tutorRepo,
courseRepo: courseRepo,
config: conf,
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}
}
func (r *OfficeHourRepo) GetAll(activeOnly bool) ([]models.OfficeHour, error) {
var rows *sql.Rows
var err error
if activeOnly {
rows, err = r.db.Query("SELECT * FROM officeHour WHERE active")
} else {
rows, err = r.db.Query("SELECT * FROM officeHour")
}
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if err != nil {
err = fmt.Errorf("Error getting all officeHours from database: %w", err)
if !errors.Is(err, sql.ErrNoRows) {
log.Println(err.Error())
}
return nil, err
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}
defer rows.Close()
return r.getFromRows(rows)
}
func (r *OfficeHourRepo) FindByCourse(course models.Course, activeOnly bool) ([]models.OfficeHour, error) {
var rows *sql.Rows
var err error
if activeOnly {
rows, err = r.db.Query("SELECT * FROM officeHour WHERE course=? and active", course.Id)
} else {
rows, err = r.db.Query("SELECT * FROM officeHour WHERE course=?", course.Id)
}
defer rows.Close()
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if err != nil {
err = fmt.Errorf("Error getting officeHours by course from database: %w", err)
if !errors.Is(err, sql.ErrNoRows) {
log.Println(err.Error())
}
return nil, err
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}
return r.getFromRows(rows)
}
func (r *OfficeHourRepo) FindByRoom(room models.Room, activeOnly bool) ([]models.OfficeHour, error) {
var rows *sql.Rows
var err error
if activeOnly {
rows, err = r.db.Query("SELECT * FROM officeHour WHERE room=? AND active", room.Id)
} else {
rows, err = r.db.Query("SELECT * FROM officeHour WHERE room=?", room.Id)
}
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if err != nil {
err = fmt.Errorf("Error getting officeHours by room from database: %w", err)
if !errors.Is(err, sql.ErrNoRows) {
log.Println(err.Error())
}
return nil, err
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}
defer rows.Close()
return r.getFromRows(rows)
}
func (r *OfficeHourRepo) FindById(id int) (models.OfficeHour, error) {
return r.getFromRow(r.db.QueryRow("SELECT * FROM officeHour WHERE id=?", id))
}
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// Add an office hour if it doesn't exist yet.
// Also add the incluyey tutor if it doesn't exist yet.
//
// Returns the id of the new office hour.
func (r *OfficeHourRepo) Add(officeHour models.OfficeHour) (int, error) {
// Find correct tutor or add if not existent
_, err := r.tutorRepo.Add(officeHour.Tutor)
if err != nil {
return 0, err
}
officeHour.Tutor, err = r.tutorRepo.FindByNameAndEmail(officeHour.Tutor.Name, officeHour.Tutor.Email)
if err != nil {
err = fmt.Errorf("Newly added tutor not found: %w", err)
log.Println(err.Error())
return 0, err
}
//Don't add identical officeHours
officeHours, err := r.FindByCourse(officeHour.Course, false)
if err != nil {
return 0, err
}
for _, oldOfficeHour := range officeHours {
if officeHour.Tutor == oldOfficeHour.Tutor &&
officeHour.Date == oldOfficeHour.Date &&
officeHour.Room == oldOfficeHour.Room &&
// officeHour.Course == oldOfficeHour.Course && already filtered above
officeHour.Info == oldOfficeHour.Info &&
officeHour.Active == oldOfficeHour.Active &&
officeHour.Duration == oldOfficeHour.Duration {
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return oldOfficeHour.Id, nil
}
}
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sqlResult, err := r.db.Exec("INSERT INTO `officeHour` (tutor, day, hour, minute, room, roomname, course, week, info, active, duration) VALUES (?,?,?,?,?,?,?,?,?,?,?)",
officeHour.Tutor.Id,
officeHour.Date.Day,
officeHour.Date.Hour,
officeHour.Date.Minute,
officeHour.Room.Id,
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officeHour.RoomName,
officeHour.Course.Id,
officeHour.Date.Week,
officeHour.Info,
officeHour.Active,
officeHour.Duration)
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if err != nil {
return 0, fmt.Errorf("SQL-error inserting new office hour: %w", err)
}
id, lastInsertIdErr := sqlResult.LastInsertId()
if lastInsertIdErr != nil {
log.Printf("Error getting Id for new tutor: %s", lastInsertIdErr.Error())
}
return int(id), err
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}
func (r *OfficeHourRepo) Delete(officeHour models.OfficeHour) error {
_, err := r.db.Exec("DELETE FROM officeHour WHERE id=?", officeHour.Id)
if err != nil {
err = fmt.Errorf("Error deleting officeHour from database: %w", err)
log.Println(err.Error())
return err
}
return nil
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}
func (r *OfficeHourRepo) getFromRow(row *sql.Row) (models.OfficeHour, error) {
var officeHour models.OfficeHour
var week, day, hour, minute, tutorId, courseId, roomId int
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err := row.Scan(&officeHour.Id, &tutorId, &day, &hour, &minute, &roomId, &officeHour.RoomName, &courseId, &week, &officeHour.Info, &officeHour.Active, &officeHour.Duration)
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if err != nil {
err = fmt.Errorf("Error getting single officeHour row from database: %w", err)
log.Println(err.Error())
return models.OfficeHour{}, err
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}
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officeHour.Date = models.Date{Week: week, Day: day, Hour: hour, Minute: minute}
officeHour.Room, err = r.roomRepo.FindById(roomId)
if err != nil {
err = fmt.Errorf("Error finding room by id %d for office hour: %w", roomId, err)
log.Println(err.Error())
return officeHour, err
}
officeHour.Tutor, err = r.tutorRepo.FindById(tutorId)
if err != nil {
err = fmt.Errorf("Error finding tutor by id %d for office hour: %w", tutorId, err)
log.Println(err.Error())
return officeHour, err
}
officeHour.Course, err = r.courseRepo.FindById(courseId)
if err != nil {
err = fmt.Errorf("Error finding course by id %d for office hour: %w", courseId, err)
log.Println(err.Error())
return officeHour, err
}
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return officeHour, nil
}
func (r *OfficeHourRepo) getFromRows(rows *sql.Rows) ([]models.OfficeHour, error) {
var officeHours []models.OfficeHour
for rows.Next() {
var officeHour models.OfficeHour
var week, day, hour, minute, tutorId, roomId, courseId int
var err error
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if err := rows.Scan(&officeHour.Id, &tutorId, &day, &hour, &minute, &roomId, &officeHour.RoomName, &courseId, &week, &officeHour.Info, &officeHour.Active, &officeHour.Duration); err != nil {
return officeHours, fmt.Errorf("Error getting multiple officeHour rows from database: %w", err)
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}
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officeHour.Date = models.Date{Week: week, Day: day, Hour: hour, Minute: minute}
officeHour.Room, err = r.roomRepo.FindById(roomId)
if err != nil {
err = fmt.Errorf("Error finding room by id %d for office hour: %w", roomId, err)
log.Println(err.Error())
return officeHours, err
}
officeHour.Tutor, err = r.tutorRepo.FindById(tutorId)
if err != nil {
err = fmt.Errorf("Error finding tutor by id %d for office hour: %w", tutorId, err)
log.Println(err.Error())
return officeHours, err
}
officeHour.Course, err = r.courseRepo.FindById(courseId)
if err != nil {
err = fmt.Errorf("Error finding course by id %d for office hour: %w", courseId, err)
log.Println(err.Error())
return officeHours, err
}
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officeHours = append(officeHours, officeHour)
}
return officeHours, nil
}
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// Get the number of office hours that are maximally parallel during a time span.
func (r *OfficeHourRepo) NumberByTimeSpanAndRoom(date models.Date, duration int, room models.Room, activeOnly bool) (int, error) {
var rows *sql.Rows
var err error
if activeOnly {
rows, err = r.db.Query("SELECT * FROM officeHour WHERE room=? AND day =? AND active", room.Id, date.Day)
} else {
rows, err = r.db.Query("SELECT * FROM officeHour WHERE room=?", room.Id)
}
if err != nil {
err = fmt.Errorf("Error getting officeHours by timespan and room from database: %w", err)
log.Println(err.Error())
return 0, err
}
defer rows.Close()
officeHours, err := r.getFromRows(rows)
if err != nil {
return 0, err
}
var count int
// iterate over all points in the new officehour to get the maximum parallel officehours
for minute := 0; minute < duration; minute += r.config.Date.MinuteGranularity {
var minuteCount int = 0
for _, officeHour := range officeHours {
// increase count if officehour starts before this point in time and ends later
if models.DateLess(officeHour.Date, models.GetEndDate(date, minute, false)) && models.DateLess(models.GetEndDate(date, minute, false), models.GetEndDate(officeHour.Date, officeHour.Duration, false)) {
if date.Week == 0 || officeHour.Week == 0 || date.Week == officeHour.Week { // office hours in alternating weeks should not collide
minuteCount += 1
}
}
}
if minuteCount > count {
count = minuteCount
}
}
return count, nil
}
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// Check whether the room capacity allows for another office hour during a time span.
func (r *OfficeHourRepo) AllowedAt(date models.Date, duration int, room models.Room, activeOnly bool) (bool, error) {
numberOfOfficeHours, err := r.NumberByTimeSpanAndRoom(date, duration, room, activeOnly)
if err != nil {
return false, err
}
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return numberOfOfficeHours < room.MaxOccupy, nil
}