Add time to timer

timer.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"database/sql"
+	"errors"
 	"log"
 	"net/http"
 	"strconv"
@@ -50,12 +51,12 @@ func initializeDatabase(db *sql.DB) error {
 		return err
 	}
 
-	err = insertTimer(tx, "My timer", 600)
+	err = insertTimer(tx, "My timer", 6)
 	if err != nil {
 		return err
 	}
 
-	err = insertTimer(tx, "My timer2", 600)
+	err = insertTimer(tx, "My timer2", 6)
 	if err != nil {
 		return err
 	}
@@ -86,7 +87,7 @@ func initializeDatabase(db *sql.DB) error {
 		return err
 	}
 
-	_, err = tx.Exec(`INSERT INTO Timer VALUES ($1, $2, $3, $4)`, userId, "steven", userUuidStr, password)
+	_, err = tx.Exec(`INSERT INTO User VALUES ($1, $2, $3, $4)`, userId, "steven", userUuidStr, password)
 	if err != nil {
 		return err
 	}
@@ -139,7 +140,17 @@ func deleteTimer(db *sql.DB, idStr string) bool {
 	}
 
 	affected, err := res.RowsAffected()
-	return err == nil && affected > 0
+	return err == nil && affected == 1
+}
+
+func updateTimerEndTime(db *sql.DB, id model.UUID, endTime model.Time) bool {
+	res, err := db.Exec("UPDATE Timer SET EndTime=$1 WHERE Id=$2", endTime, id)
+	if err != nil {
+		return false
+	}
+
+	affected, err := res.RowsAffected()
+	return err == nil && affected == 1
 }
 
 type Session struct {
@@ -174,6 +185,65 @@ func (server *MyServer) handleTimer(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func parseDuration(value string) (time.Duration, error) {
+	const nullDuration = time.Duration(0)
+	if len(value) == 0 {
+		return nullDuration, errors.New("Empty duration string")
+	}
+
+	var unit time.Duration
+	switch value[len(value)-1] {
+	case 's':
+		unit = time.Second
+	case 'm':
+		unit = time.Minute
+	case 'h':
+		unit = time.Hour
+	case 'd':
+		unit = time.Duration(24) * time.Hour
+	case 'w':
+		unit = time.Duration(24*7) * time.Hour
+	default:
+		return nullDuration, errors.New("Invalid duration format")
+	}
+
+	amount, err := strconv.ParseInt(value[0:len(value)-1], 10, 64)
+	if err != nil || amount < 0 {
+		return nullDuration, errors.New("Invalid duration value")
+	}
+
+	return time.Duration(amount) * unit, nil
+}
+
+func (server *MyServer) handleTimerAddTime(w http.ResponseWriter, r *http.Request) {
+	timer := queryTimer(server.db, r.PathValue("timerId"))
+	if timer == nil {
+		server.handleNotFound(w, r)
+		return
+	}
+
+	if timer.IsFinished() {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	duration, err := parseDuration(r.PathValue("timeToAdd"))
+	if err != nil {
+		w.WriteHeader(http.StatusBadRequest)
+		w.Write([]byte(err.Error()))
+		return
+	}
+
+	timer.EndTime.Add(duration)
+	res := updateTimerEndTime(server.db, timer.Id, timer.EndTime)
+	if !res {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	view.TimerView(*timer).Render(context.Background(), w)
+}
+
 func (server *MyServer) handleDeleteTimer(w http.ResponseWriter, r *http.Request) {
 	success := deleteTimer(server.db, r.PathValue("timerId"))
 	if !success {
@@ -244,6 +314,7 @@ func main() {
 	http.Handle("GET /static/", http.StripPrefix("/static/", fs))
 
 	http.HandleFunc("GET /timer/{timerId}", myServer.handleTimer)
+	http.HandleFunc("POST /timer/{timerId}/addTime/{timeToAdd}", myServer.handleTimerAddTime)
 	http.HandleFunc("DELETE /timer/{timerId}", myServer.handleDeleteTimer)
 	http.HandleFunc("PUT /timer", myServer.handlePutTimer)
 	http.HandleFunc("GET /", myServer.handleMain)