school-timetracker/backend/database.go

package main

import (
	"database/sql"
	"fmt"
	"log"

	"golang.org/x/crypto/bcrypt"
	_ "modernc.org/sqlite"
)

func InitDB(filepath string) *sql.DB {
	db, err := sql.Open("sqlite", filepath)
	if err != nil {
		log.Fatal(err)
	}

	if err = db.Ping(); err != nil {
		log.Fatal(err)
	}

	createTables(db)
	return db
}

func createTables(db *sql.DB) {
	queries := []string{
		`CREATE TABLE IF NOT EXISTS users (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            username TEXT UNIQUE NOT NULL,
            password TEXT NOT NULL,
            is_admin BOOLEAN NOT NULL DEFAULT 0
        )`,
		`CREATE TABLE IF NOT EXISTS schedules (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            day_of_week INTEGER NOT NULL,
            start_time TEXT NOT NULL,
            end_time TEXT NOT NULL,
            type TEXT NOT NULL,
            title TEXT NOT NULL
        )`,
		`CREATE TABLE IF NOT EXISTS time_entries (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            user_id INTEGER NOT NULL,
            schedule_id INTEGER NOT NULL,
            date TEXT NOT NULL,
            type TEXT NOT NULL,
            created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
            FOREIGN KEY (user_id) REFERENCES users(id),
            FOREIGN KEY (schedule_id) REFERENCES schedules(id)
        )`,
	}

	for _, query := range queries {
		if _, err := db.Exec(query); err != nil {
			log.Fatal(err)
		}
	}

	// Create default admin user (password: admin123)
	// Hash generated with bcrypt
	hash, _ := bcrypt.GenerateFromPassword([]byte("admin123"), bcrypt.DefaultCost)
	fmt.Println(string(hash))
	_, err := db.Exec(`
    INSERT OR IGNORE INTO users (id, username, password, is_admin)
    VALUES (?, ?, ?, ?)`,
		1, "admin", string(hash), true,
	)
	if err != nil {
		log.Fatal(err)
	}
}

func GetUserByUsername(db *sql.DB, username string) (*User, error) {
	user := &User{}
	err := db.QueryRow("SELECT id, username, password, is_admin FROM users WHERE username = ?", username).
		Scan(&user.ID, &user.Username, &user.Password, &user.IsAdmin)
	if err != nil {
		return nil, err
	}
	return user, nil
}

func CreateUser(db *sql.DB, username, hashedPassword string, isAdmin bool) error {
	_, err := db.Exec("INSERT INTO users (username, password, is_admin) VALUES (?, ?, ?)",
		username, hashedPassword, isAdmin)
	return err
}

func GetAllUsers(db *sql.DB) ([]User, error) {
	rows, err := db.Query("SELECT id, username, is_admin FROM users")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var users []User
	for rows.Next() {
		var u User
		if err := rows.Scan(&u.ID, &u.Username, &u.IsAdmin); err != nil {
			continue
		}
		users = append(users, u)
	}
	return users, nil
}

func CreateSchedule(db *sql.DB, schedule *Schedule) error {
	_, err := db.Exec("INSERT INTO schedules (day_of_week, start_time, end_time, type, title) VALUES (?, ?, ?, ?, ?)",
		schedule.DayOfWeek, schedule.StartTime, schedule.EndTime, schedule.Type, schedule.Title)
	return err
}

func GetAllSchedules(db *sql.DB) ([]Schedule, error) {
	rows, err := db.Query("SELECT id, day_of_week, start_time, end_time, type, title FROM schedules ORDER BY day_of_week, start_time")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var schedules []Schedule
	for rows.Next() {
		var s Schedule
		if err := rows.Scan(&s.ID, &s.DayOfWeek, &s.StartTime, &s.EndTime, &s.Type, &s.Title); err != nil {
			continue
		}
		schedules = append(schedules, s)
	}
	return schedules, nil
}

func DeleteSchedule(db *sql.DB, id int) error {
	_, err := db.Exec("DELETE FROM schedules WHERE id = ?", id)
	return err
}

func CreateTimeEntry(db *sql.DB, entry *TimeEntry) error {
	_, err := db.Exec("INSERT INTO time_entries (user_id, schedule_id, date, type) VALUES (?, ?, ?, ?)",
		entry.UserID, entry.ScheduleID, entry.Date, entry.Type)
	return err
}

func GetTimeEntriesByUser(db *sql.DB, userID int) ([]TimeEntry, error) {
	rows, err := db.Query("SELECT id, user_id, schedule_id, date, type, created_at FROM time_entries WHERE user_id = ? ORDER BY date DESC, created_at DESC",
		userID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var entries []TimeEntry
	for rows.Next() {
		var e TimeEntry
		if err := rows.Scan(&e.ID, &e.UserID, &e.ScheduleID, &e.Date, &e.Type, &e.CreatedAt); err != nil {
			continue
		}
		entries = append(entries, e)
	}
	return entries, nil
}

func GetAllTimeEntries(db *sql.DB) ([]TimeEntry, error) {
	rows, err := db.Query("SELECT id, user_id, schedule_id, date, type, created_at FROM time_entries ORDER BY date DESC, created_at DESC")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var entries []TimeEntry
	for rows.Next() {
		var e TimeEntry
		if err := rows.Scan(&e.ID, &e.UserID, &e.ScheduleID, &e.Date, &e.Type, &e.CreatedAt); err != nil {
			continue
		}
		entries = append(entries, e)
	}
	return entries, nil
}