refactor: rebuild the app in golang with the fyne framework

internal/data/database.go

@@ -0,0 +1,117 @@
+package data
+
+import (
+	"database/sql"
+	"log"
+	"time"
+
+	_ "modernc.org/sqlite" // Importiert den SQLite-Treiber
+)
+
+type DatabaseService struct {
+	DB *sql.DB
+}
+
+func NewDatabaseService(dbPath string) (*DatabaseService, error) {
+	db, err := sql.Open("sqlite", dbPath)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = db.Ping(); err != nil {
+		return nil, err
+	}
+
+	createTableSQL := `
+	CREATE TABLE IF NOT EXISTS training (
+		id INTEGER PRIMARY KEY AUTOINCREMENT,
+		date TEXT NOT NULL,
+		sets INTEGER,
+		weightLeft REAL,
+		weightRight REAL,
+		repsPerSet INTEGER,
+		duration INTEGER,
+		program TEXT,
+		blockDay INTEGER
+	);`
+
+	_, err = db.Exec(createTableSQL)
+	if err != nil {
+		log.Printf("Fehler beim Erstellen der Tabelle: %v", err)
+		return nil, err
+	}
+
+	// Hier könnten wir auch komplexere Migrationen wie dein _onUpgrade handle,
+	// aber für den Anfang reicht das Erstellen der Tabelle.
+
+	log.Println("Datenbank erfolgreich initialisiert.")
+	return &DatabaseService{DB: db}, nil
+}
+
+func (s *DatabaseService) SaveTraining(session *TrainingSession) error {
+	dateStr := session.Date.Format(time.RFC3339)
+
+	query := `
+		INSERT INTO training (id, date, sets, weightLeft, weightRight, repsPerSet, duration, program, blockDay)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+		ON CONFLICT(id) DO UPDATE SET
+			date = excluded.date,
+			sets = excluded.sets,
+			weightLeft = excluded.weightLeft,
+			weightRight = excluded.weightRight,
+			repsPerSet = excluded.repsPerSet,
+			duration = excluded.duration,
+			program = excluded.program,
+			blockDay = excluded.blockDay;
+	`
+	var id any
+	if session.ID != 0 {
+		id = session.ID
+	}
+
+	_, err := s.DB.Exec(query, id, dateStr, session.Sets, session.WeightLeft, session.WeightRight, session.RepsPerSet, session.Duration, session.Program, session.BlockDay)
+	return err
+}
+
+func (s *DatabaseService) GetTrainingCount() (int, error) {
+	var count int
+	query := "SELECT COUNT(*) FROM training;"
+	err := s.DB.QueryRow(query).Scan(&count)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			return 0, nil
+		}
+		return 0, err
+	}
+	return count, nil
+}
+
+func (s *DatabaseService) GetHistory() ([]TrainingSession, error) {
+	query := `SELECT id, date, sets, weightLeft, weightRight, repsPerSet, duration, program, blockDay FROM training ORDER BY date DESC LIMIT 20;`
+
+	rows, err := s.DB.Query(query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var sessions []TrainingSession
+	for rows.Next() {
+		var s TrainingSession
+		var dateStr string
+
+		err := rows.Scan(&s.ID, &dateStr, &s.Sets, &s.WeightLeft, &s.WeightRight, &s.RepsPerSet, &s.Duration, &s.Program, &s.BlockDay)
+		if err != nil {
+			return nil, err
+		}
+
+		s.Date, err = time.Parse(time.RFC3339, dateStr)
+		if err != nil {
+			return nil, err
+		}
+
+		sessions = append(sessions, s)
+	}
+
+	return sessions, nil
+}