752 lines
18 KiB
Go
752 lines
18 KiB
Go
package main
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import (
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"database/sql"
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"encoding/json"
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"html/template"
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"log"
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"net/http"
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"strconv"
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"time"
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_ "github.com/mattn/go-sqlite3"
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)
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var (
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db *sql.DB
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indexTmpl *template.Template
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listenAddr = ":8080"
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databaseFile = "fitness.db"
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)
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type SetRow struct {
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ID int
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Exercise string
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Reps int
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Weight float64
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StartedAt time.Time
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}
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func main() {
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var err error
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// Open SQLite DB
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db, err = sql.Open("sqlite3", databaseFile)
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if err != nil {
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log.Fatal("open db:", err)
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}
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defer db.Close()
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if err := initDB(); err != nil {
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log.Fatal("init db:", err)
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}
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// Parse template with helper funcs
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indexTmpl = template.Must(template.New("index").Funcs(template.FuncMap{
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"add": func(a, b int) int { return a + b },
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}).Parse(indexHTML))
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// Routes
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http.HandleFunc("/", handleIndex)
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http.HandleFunc("/start", handleStartWorkout)
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http.HandleFunc("/add-set", handleAddSet)
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// APIs
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http.HandleFunc("/api/rest-times", handleRestTimes)
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http.HandleFunc("/api/volume", handleVolumeStats)
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log.Printf("Listening on %s ...", listenAddr)
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if err := http.ListenAndServe(listenAddr, nil); err != nil {
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log.Fatal(err)
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}
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}
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func initDB() error {
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// Very simple schema
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schema := `
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CREATE TABLE IF NOT EXISTS workouts (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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started_at TEXT NOT NULL
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);
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CREATE TABLE IF NOT EXISTS sets (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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workout_id INTEGER NOT NULL,
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exercise TEXT NOT NULL,
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reps INTEGER NOT NULL,
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weight REAL NOT NULL,
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started_at TEXT NOT NULL,
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FOREIGN KEY(workout_id) REFERENCES workouts(id)
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);
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`
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_, err := db.Exec(schema)
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return err
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}
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// --- Handlers ---
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func handleIndex(w http.ResponseWriter, r *http.Request) {
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latestID, err := getLatestWorkoutID()
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if err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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var sets []SetRow
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if latestID != 0 {
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sets, err = getSetsForWorkout(latestID)
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if err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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}
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data := struct {
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HasWorkout bool
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WorkoutID int
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Sets []SetRow
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}{
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HasWorkout: latestID != 0,
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WorkoutID: latestID,
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Sets: sets,
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}
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if err := indexTmpl.Execute(w, data); err != nil {
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log.Println("template error:", err)
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}
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}
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func handleStartWorkout(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodPost {
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http.Redirect(w, r, "/", http.StatusSeeOther)
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return
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}
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now := time.Now().UTC().Format(time.RFC3339)
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_, err := db.Exec(`INSERT INTO workouts (started_at) VALUES (?)`, now)
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if err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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http.Redirect(w, r, "/", http.StatusSeeOther)
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}
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func handleAddSet(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodPost {
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http.Redirect(w, r, "/", http.StatusSeeOther)
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return
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}
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// Always attach to latest workout
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workoutID, err := getLatestWorkoutID()
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if err != nil || workoutID == 0 {
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http.Error(w, "no active workout", http.StatusBadRequest)
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return
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}
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// NEW: exercise from dropdown + optional custom
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selected := r.FormValue("exercise_select")
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exerciseCustom := r.FormValue("exercise_custom")
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exercise := selected
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if selected == "custom" {
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exercise = exerciseCustom
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}
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repsStr := r.FormValue("reps")
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weightStr := r.FormValue("weight")
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if exercise == "" || repsStr == "" || weightStr == "" {
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http.Error(w, "missing fields", http.StatusBadRequest)
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return
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}
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reps, err := strconv.Atoi(repsStr)
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if err != nil {
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http.Error(w, "invalid reps", http.StatusBadRequest)
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return
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}
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weight, err := strconv.ParseFloat(weightStr, 64)
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if err != nil {
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http.Error(w, "invalid weight", http.StatusBadRequest)
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return
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}
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now := time.Now().UTC().Format(time.RFC3339)
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_, err = db.Exec(
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`INSERT INTO sets (workout_id, exercise, reps, weight, started_at)
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VALUES (?, ?, ?, ?, ?)`,
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workoutID, exercise, reps, weight, now,
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)
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if err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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http.Redirect(w, r, "/", http.StatusSeeOther)
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}
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// --- API: rest times between sets (latest workout) ---
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func handleRestTimes(w http.ResponseWriter, r *http.Request) {
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workoutID, err := getLatestWorkoutID()
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if err != nil || workoutID == 0 {
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http.Error(w, "no workout", http.StatusBadRequest)
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return
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}
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rows, err := db.Query(
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`SELECT id, started_at FROM sets WHERE workout_id = ? ORDER BY started_at`,
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workoutID,
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)
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if err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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defer rows.Close()
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type simpleSet struct {
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ID int
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StartedAt time.Time
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}
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var sets []simpleSet
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for rows.Next() {
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var id int
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var startedStr string
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if err := rows.Scan(&id, &startedStr); err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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t, err := time.Parse(time.RFC3339, startedStr)
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if err != nil {
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http.Error(w, "time parse error", http.StatusInternalServerError)
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return
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}
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sets = append(sets, simpleSet{ID: id, StartedAt: t})
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}
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if err := rows.Err(); err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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// Compute rest times (seconds) between sets
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var labels []string
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var data []float64
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for i := 1; i < len(sets); i++ {
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delta := sets[i].StartedAt.Sub(sets[i-1].StartedAt).Seconds()
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if delta < 0 {
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delta = 0
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}
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labels = append(labels, "Set "+strconv.Itoa(i+1))
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data = append(data, delta)
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}
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resp := struct {
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Labels []string `json:"labels"`
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Data []float64 `json:"data"`
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}{
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Labels: labels,
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Data: data,
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}
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w.Header().Set("Content-Type", "application/json")
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_ = json.NewEncoder(w).Encode(resp)
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}
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// --- API: volume stats (day / week / month) ---
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func handleVolumeStats(w http.ResponseWriter, r *http.Request) {
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rangeParam := r.URL.Query().Get("range")
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if rangeParam == "" {
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rangeParam = "day"
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}
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now := time.Now()
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var curStart, curEnd time.Time
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switch rangeParam {
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case "week":
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// Start of ISO week (Monday)
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weekday := int(now.Weekday())
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if weekday == 0 {
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weekday = 7 // Sunday
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}
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curStart = time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location()).
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AddDate(0, 0, -(weekday - 1))
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curEnd = curStart.AddDate(0, 0, 7)
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case "month":
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curStart = time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location())
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curEnd = curStart.AddDate(0, 1, 0)
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default: // "day"
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curStart = time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location())
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curEnd = curStart.AddDate(0, 0, 1)
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rangeParam = "day"
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}
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// Previous period of same length
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period := curEnd.Sub(curStart)
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prevEnd := curStart
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prevStart := prevEnd.Add(-period)
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currentVol, err := queryVolume(curStart, curEnd)
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if err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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prevVol, err := queryVolume(prevStart, prevEnd)
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if err != nil {
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http.Error(w, "db error", http.StatusInternalServerError)
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return
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}
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percentChange := 0.0
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hasPrevious := prevVol > 0
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if hasPrevious {
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percentChange = (currentVol - prevVol) / prevVol * 100.0
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}
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resp := struct {
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Range string `json:"range"`
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CurrentVolume float64 `json:"current_volume"`
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PreviousVolume float64 `json:"previous_volume"`
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PercentChange float64 `json:"percent_change"`
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HasPrevious bool `json:"has_previous"`
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CurrentLabel string `json:"current_label"`
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PreviousLabel string `json:"previous_label"`
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}{
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Range: rangeParam,
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CurrentVolume: currentVol,
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PreviousVolume: prevVol,
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PercentChange: percentChange,
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HasPrevious: hasPrevious,
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CurrentLabel: curStart.Format("2006-01-02"),
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PreviousLabel: prevStart.Format("2006-01-02"),
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}
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w.Header().Set("Content-Type", "application/json")
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_ = json.NewEncoder(w).Encode(resp)
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}
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func queryVolume(start, end time.Time) (float64, error) {
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// Sum of (reps * weight) for sets whose started_at is in [start, end)
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startStr := start.UTC().Format(time.RFC3339)
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endStr := end.UTC().Format(time.RFC3339)
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row := db.QueryRow(`
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SELECT COALESCE(SUM(reps * weight), 0)
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FROM sets
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WHERE started_at >= ? AND started_at < ?
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`, startStr, endStr)
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var vol float64
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if err := row.Scan(&vol); err != nil {
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return 0, err
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}
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return vol, nil
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}
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// --- Helpers ---
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func getLatestWorkoutID() (int, error) {
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row := db.QueryRow(`SELECT id FROM workouts ORDER BY id DESC LIMIT 1`)
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var id int
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err := row.Scan(&id)
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if err == sql.ErrNoRows {
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return 0, nil
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}
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return id, err
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}
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func getSetsForWorkout(workoutID int) ([]SetRow, error) {
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rows, err := db.Query(
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`SELECT id, exercise, reps, weight, started_at
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FROM sets
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WHERE workout_id = ?
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ORDER BY started_at`,
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workoutID,
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)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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var out []SetRow
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for rows.Next() {
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var s SetRow
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var startedStr string
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if err := rows.Scan(&s.ID, &s.Exercise, &s.Reps, &s.Weight, &startedStr); err != nil {
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return nil, err
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}
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t, err := time.Parse(time.RFC3339, startedStr)
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if err != nil {
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return nil, err
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}
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s.StartedAt = t
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out = append(out, s)
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}
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return out, rows.Err()
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}
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// --- HTML template (single page) ---
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const indexHTML = `
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Minimal Fitness Tracker</title>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<style>
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body {
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font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
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max-width: 900px;
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margin: 0 auto;
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padding: 1rem;
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background: #111827;
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color: #e5e7eb;
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}
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h1 { margin-bottom: 0.5rem; }
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.card {
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background: #1f2937;
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border-radius: 0.75rem;
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padding: 1rem 1.25rem;
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margin-bottom: 1rem;
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}
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label { display:block; margin-top: 0.5rem; }
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input[type="text"],
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input[type="number"],
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select {
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width: 100%;
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padding: 0.4rem 0.5rem;
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border-radius: 0.375rem;
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border: 1px solid #374151;
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background: #111827;
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color: #e5e7eb;
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}
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button {
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margin-top: 0.75rem;
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padding: 0.4rem 0.9rem;
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border-radius: 0.375rem;
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border: none;
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background: #3b82f6;
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color: white;
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cursor: pointer;
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}
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button:hover { background: #2563eb; }
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table {
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width: 100%;
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border-collapse: collapse;
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margin-top: 0.5rem;
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}
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th, td {
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border-bottom: 1px solid #374151;
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padding: 0.4rem 0.3rem;
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text-align: left;
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}
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th { font-size: 0.85rem; text-transform: uppercase; color:#9ca3af; }
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canvas {
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max-width: 100%;
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background: #111827;
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border-radius: 0.75rem;
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padding: 0.5rem;
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}
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.badge {
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display:inline-block;
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padding: 0.15rem 0.5rem;
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border-radius: 999px;
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font-size: 0.75rem;
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background:#111827;
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color:#9ca3af;
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}
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.row {
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display: grid;
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grid-template-columns: 1fr;
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gap: 1rem;
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}
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@media (min-width: 768px) {
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.row {
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grid-template-columns: 1.1fr 0.9fr;
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}
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}
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.flex-row {
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display:flex;
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gap:0.5rem;
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align-items:center;
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}
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.flex-row input[type="text"] {
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flex:1;
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}
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.small {
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font-size:0.8rem;
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color:#9ca3af;
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}
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</style>
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</head>
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<body>
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<h1>Minimal Fitness Tracker</h1>
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<p style="color:#9ca3af;">Simple self-hosted Go app – 5×5 friendly: pick standard lifts, track volume and rest.</p>
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<div class="row">
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<div>
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<div class="card">
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<h2>Workout</h2>
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{{if .HasWorkout}}
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<p>Current workout ID: <span class="badge">{{.WorkoutID}}</span></p>
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{{else}}
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<p>No workout yet.</p>
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{{end}}
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<form method="POST" action="/start">
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<button type="submit">Start new workout</button>
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</form>
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</div>
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<div class="card">
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<h2>Add set</h2>
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{{if .HasWorkout}}
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<form method="POST" action="/add-set">
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<label>
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Exercise (5×5 core lifts & friends)
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<select name="exercise_select" id="exercise_select" required onchange="toggleCustomExercise()">
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<option value="Squat">Squat</option>
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<option value="Bench Press">Bench Press</option>
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<option value="Barbell Row">Barbell Row</option>
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<option value="Overhead Press">Overhead Press</option>
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<option value="Deadlift">Deadlift</option>
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<option value="Pull-up">Pull-up</option>
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<option value="Chin-up">Chin-up</option>
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<option value="Dip">Dip</option>
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<option value="Barbell Curl">Barbell Curl</option>
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<option value="Tricep Extension">Tricep Extension</option>
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<option value="Face Pull">Face Pull</option>
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<option value="Lat Pulldown">Lat Pulldown</option>
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<option value="custom">Custom…</option>
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</select>
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</label>
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<div class="flex-row small" id="customExerciseRow" style="margin-top:0.4rem; display:none;">
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<span>Custom name:</span>
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<input type="text" name="exercise_custom" id="exercise_custom" placeholder="Front Squat, Incline Bench…">
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</div>
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<label>
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Reps
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<input type="number" name="reps" min="1" step="1" required>
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</label>
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<label>
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Weight (kg)
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<input type="number" name="weight" step="0.5" min="0" required>
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</label>
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<button type="submit">Save set</button>
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</form>
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{{else}}
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<p style="color:#fbbf24;">Start a workout first.</p>
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{{end}}
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</div>
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<div class="card">
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<h2>Sets in latest workout</h2>
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{{if .Sets}}
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<table>
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<thead>
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<tr>
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<th>#</th>
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<th>Exercise</th>
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<th>Reps</th>
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||
<th>Weight</th>
|
||
<th>Time (UTC)</th>
|
||
</tr>
|
||
</thead>
|
||
<tbody>
|
||
{{range $i, $s := .Sets}}
|
||
<tr>
|
||
<td>{{add $i 1}}</td>
|
||
<td>{{$s.Exercise}}</td>
|
||
<td>{{$s.Reps}}</td>
|
||
<td>{{$s.Weight}}</td>
|
||
<td>{{$s.StartedAt.Format "15:04:05"}}</td>
|
||
</tr>
|
||
{{end}}
|
||
</tbody>
|
||
</table>
|
||
{{else}}
|
||
<p>No sets logged yet.</p>
|
||
{{end}}
|
||
</div>
|
||
</div>
|
||
|
||
<div>
|
||
<div class="card">
|
||
<h2>Rest time between sets (latest workout)</h2>
|
||
<canvas id="restChart" height="120"></canvas>
|
||
<p id="restInfo" style="font-size:0.85rem; color:#9ca3af; margin-top:0.3rem;"></p>
|
||
</div>
|
||
|
||
<div class="card">
|
||
<h2>Training volume (Σ weight × reps)</h2>
|
||
<label for="rangeSelect">View range</label>
|
||
<select id="rangeSelect" onchange="loadVolumeStats()">
|
||
<option value="day">Today vs yesterday</option>
|
||
<option value="week">This week vs last week</option>
|
||
<option value="month">This month vs last month</option>
|
||
</select>
|
||
<canvas id="volumeChart" height="120" style="margin-top:0.5rem;"></canvas>
|
||
<p id="volumeInfo" style="font-size:0.85rem; color:#9ca3af; margin-top:0.3rem;"></p>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<!-- Chart.js from CDN -->
|
||
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
|
||
<script>
|
||
let restChartInstance = null;
|
||
let volumeChartInstance = null;
|
||
|
||
function toggleCustomExercise() {
|
||
const select = document.getElementById('exercise_select');
|
||
const row = document.getElementById('customExerciseRow');
|
||
const input = document.getElementById('exercise_custom');
|
||
|
||
if (select.value === 'custom') {
|
||
row.style.display = 'flex';
|
||
input.required = true;
|
||
} else {
|
||
row.style.display = 'none';
|
||
input.required = false;
|
||
input.value = '';
|
||
}
|
||
}
|
||
|
||
function loadRestTimes() {
|
||
fetch('/api/rest-times')
|
||
.then(res => {
|
||
if (!res.ok) {
|
||
throw new Error("No rest data yet");
|
||
}
|
||
return res.json();
|
||
})
|
||
.then(data => {
|
||
const ctx = document.getElementById('restChart').getContext('2d');
|
||
|
||
if (!data || !data.labels || data.labels.length === 0) {
|
||
document.getElementById('restInfo').textContent =
|
||
'Log at least two sets to see rest times.';
|
||
return;
|
||
}
|
||
|
||
if (restChartInstance) {
|
||
restChartInstance.destroy();
|
||
}
|
||
|
||
restChartInstance = new Chart(ctx, {
|
||
type: 'bar',
|
||
data: {
|
||
labels: data.labels,
|
||
datasets: [{
|
||
label: 'Rest (seconds)',
|
||
data: data.data
|
||
}]
|
||
},
|
||
options: {
|
||
scales: {
|
||
y: {
|
||
beginAtZero: true
|
||
}
|
||
}
|
||
}
|
||
});
|
||
|
||
const avg = data.data.reduce((a,b)=>a+b,0) / data.data.length;
|
||
document.getElementById('restInfo').textContent =
|
||
'Average rest: ' + avg.toFixed(1) + ' s';
|
||
})
|
||
.catch(err => {
|
||
document.getElementById('restInfo').textContent =
|
||
'No rest data yet – add some sets.';
|
||
});
|
||
}
|
||
|
||
function loadVolumeStats() {
|
||
const range = document.getElementById('rangeSelect').value;
|
||
fetch('/api/volume?range=' + encodeURIComponent(range))
|
||
.then(res => {
|
||
if (!res.ok) {
|
||
throw new Error("No volume data");
|
||
}
|
||
return res.json();
|
||
})
|
||
.then(data => {
|
||
const ctx = document.getElementById('volumeChart').getContext('2d');
|
||
|
||
if (volumeChartInstance) {
|
||
volumeChartInstance.destroy();
|
||
}
|
||
|
||
volumeChartInstance = new Chart(ctx, {
|
||
type: 'bar',
|
||
data: {
|
||
labels: [data.previous_label, data.current_label],
|
||
datasets: [{
|
||
label: 'Volume (kg × reps)',
|
||
data: [data.previous_volume, data.current_volume]
|
||
}]
|
||
},
|
||
options: {
|
||
scales: {
|
||
y: {
|
||
beginAtZero: true
|
||
}
|
||
}
|
||
}
|
||
});
|
||
|
||
let text = '';
|
||
const current = data.current_volume;
|
||
const previous = data.previous_volume;
|
||
|
||
const prettyRange =
|
||
data.range === 'day' ? 'today' :
|
||
data.range === 'week' ? 'this week' :
|
||
'this month';
|
||
|
||
if (!data.has_previous) {
|
||
text = 'Total volume ' + prettyRange + ': ' + current.toFixed(1) +
|
||
' (no previous period logged).';
|
||
} else {
|
||
const change = data.percent_change;
|
||
let dir = 'no change';
|
||
let arrow = '';
|
||
if (change > 1e-6) {
|
||
dir = 'up';
|
||
arrow = '▲';
|
||
} else if (change < -1e-6) {
|
||
dir = 'down';
|
||
arrow = '▼';
|
||
}
|
||
text = 'Total volume ' + prettyRange + ': ' + current.toFixed(1) +
|
||
' (previous: ' + previous.toFixed(1) +
|
||
'). Change: ' + dir + ' ' + arrow + ' ' +
|
||
change.toFixed(1) + '%.';
|
||
}
|
||
|
||
document.getElementById('volumeInfo').textContent = text;
|
||
})
|
||
.catch(err => {
|
||
document.getElementById('volumeInfo').textContent =
|
||
'No volume data yet – log some sets.';
|
||
});
|
||
}
|
||
|
||
document.addEventListener('DOMContentLoaded', () => {
|
||
toggleCustomExercise();
|
||
loadRestTimes();
|
||
loadVolumeStats();
|
||
});
|
||
</script>
|
||
</body>
|
||
</html>
|
||
`
|