school-timetracker/backend/handlers.go

package main

import (
	"database/sql"
	"net/http"
	"strconv"
	"time"

	"github.com/labstack/echo/v4"
	"golang.org/x/crypto/bcrypt"
)

type App struct {
	DB *sql.DB
}

// Login Handler
func (app *App) LoginHandler(c echo.Context) error {
	var req LoginRequest
	if err := c.Bind(&req); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid request")
	}

	user, err := GetUserByUsername(app.DB, req.Username)
	if err != nil {
		return echo.NewHTTPError(http.StatusUnauthorized, "invalid credentials")
	}

	if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(req.Password)); err != nil {
		return echo.NewHTTPError(http.StatusUnauthorized, "invalid credentials")
	}

	token, err := createToken(user.ID, user.Username, user.IsAdmin)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "error creating token")
	}

	response := LoginResponse{
		Token:    token,
		Username: user.Username,
		IsAdmin:  user.IsAdmin,
	}

	return c.JSON(http.StatusOK, response)
}

// Schedule Handlers
func (app *App) GetSchedulesHandler(c echo.Context) error {
	schedules, err := GetAllSchedules(app.DB)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}
	return c.JSON(http.StatusOK, schedules)
}

func (app *App) CreateScheduleHandler(c echo.Context) error {
	var schedule Schedule
	if err := c.Bind(&schedule); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid request")
	}

	if err := CreateSchedule(app.DB, &schedule); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.JSON(http.StatusCreated, map[string]string{"message": "schedule created"})
}

func (app *App) DeleteScheduleHandler(c echo.Context) error {
	id, err := strconv.Atoi(c.QueryParam("id"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid id")
	}

	if err := DeleteSchedule(app.DB, id); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.NoContent(http.StatusOK)
}

// User Handlers
func (app *App) CreateUserHandler(c echo.Context) error {
	var req CreateUserRequest
	if err := c.Bind(&req); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid request")
	}

	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "error hashing password")
	}

	if err := CreateUser(app.DB, req.Username, string(hashedPassword), req.IsAdmin); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.JSON(http.StatusCreated, map[string]string{"message": "user created"})
}

func (app *App) GetUsersHandler(c echo.Context) error {
	users, err := GetAllUsers(app.DB)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}
	return c.JSON(http.StatusOK, users)
}

func (app *App) DeleteUserHandler(c echo.Context) error {
	id, err := strconv.Atoi(c.QueryParam("id"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid id")
	}

	if err := DeleteUser(app.DB, id); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.NoContent(http.StatusOK)
}

// Time Entry Handlers
func (app *App) CreateTimeEntryHandler(c echo.Context) error {
	userID := c.Get("user_id").(int)

	var entry TimeEntry
	if err := c.Bind(&entry); err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid request")
	}

	entry.UserID = userID

	if err := CreateTimeEntry(app.DB, &entry); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.JSON(http.StatusCreated, map[string]string{"message": "time entry created"})
}

func (app *App) GetMyTimeEntriesHandler(c echo.Context) error {
	userID := c.Get("user_id").(int)

	entries, err := GetTimeEntriesByUser(app.DB, userID)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.JSON(http.StatusOK, entries)
}

// GetWeekDates - Gibt die Daten einer Woche zurück (Montag-Freitag)
func (app *App) GetWeekDates(c echo.Context) error {
	year, err := strconv.Atoi(c.QueryParam("year"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid year")
	}

	week, err := strconv.Atoi(c.QueryParam("week"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid week")
	}

	dates := calculateWeekDates(year, week)
	return c.JSON(http.StatusOK, dates)
}

// CheckWeekHasEntries - Prüft ob User Einträge für eine Woche hat
func (app *App) CheckWeekHasEntries(c echo.Context) error {
	userID := c.Get("user_id").(int)

	year, err := strconv.Atoi(c.QueryParam("year"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid year")
	}

	week, err := strconv.Atoi(c.QueryParam("week"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid week")
	}

	hasEntries, err := CheckUserHasEntriesForWeek(app.DB, userID, year, week)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.JSON(http.StatusOK, map[string]bool{"has_entries": hasEntries})
}

func (app *App) GetAllTimeEntriesHandler(c echo.Context) error {
	entries, err := GetAllTimeEntries(app.DB)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}
	return c.JSON(http.StatusOK, entries)
}

func (app *App) GetWeeklyHoursHandler(c echo.Context) error {
	hours, err := GetWeeklyHours(app.DB)
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}
	return c.JSON(http.StatusOK, hours)
}

func (app *App) DeleteWeekEntries(c echo.Context) error {
	userID := c.Get("user_id").(int)

	year, err := strconv.Atoi(c.QueryParam("year"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid year")
	}

	week, err := strconv.Atoi(c.QueryParam("week"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "Invalid week")
	}

	if err := DeleteTimeEntriesByUserAndWeek(app.DB, userID, year, week); err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
	}

	return c.NoContent(http.StatusOK)
}

type WeekDates struct {
	Year  int               `json:"year"`
	Week  int               `json:"week"`
	Dates map[string]string `json:"dates"` // dayOfWeek -> date
	Range string            `json:"range"` // "2025-11-03 bis 2025-11-07"
}

func calculateWeekDates(year, week int) WeekDates {
	// ISO 8601: Woche 1 ist die Woche mit dem ersten Donnerstag
	// Finde den ersten Donnerstag des Jahres
	jan4 := time.Date(year, time.January, 4, 0, 0, 0, 0, time.UTC)

	// Finde Montag der Woche 1
	weekday := int(jan4.Weekday())
	if weekday == 0 {
		weekday = 7 // Sonntag -> 7
	}
	daysToMonday := weekday - 1
	mondayWeek1 := jan4.AddDate(0, 0, -daysToMonday)

	// Berechne Montag der gewünschten Woche
	targetMonday := mondayWeek1.AddDate(0, 0, (week-1)*7)

	dates := make(map[string]string)
	weekDays := []string{"0", "1", "2", "3", "4"} // Montag bis Freitag

	var firstDate, lastDate time.Time
	for i, day := range weekDays {
		date := targetMonday.AddDate(0, 0, i)
		dates[day] = date.Format("2006-01-02")

		if i == 0 {
			firstDate = date
		}
		if i == 4 {
			lastDate = date
		}
	}

	rangeStr := firstDate.Format("2006-01-02") + " bis " + lastDate.Format("2006-01-02")

	return WeekDates{
		Year:  year,
		Week:  week,
		Dates: dates,
		Range: rangeStr,
	}
}