feat: unregister-event api

apimodels/create_event.go

@@ -5,6 +5,6 @@ type CreateEvent struct {
 	Description        string `json:"description"`
 	StartDate          string `json:"startDate"`
 	EndDate            string `json:"endDate"`
-	VolunteersRequired int    `json:"volunteersRequired"`
+	VolunteersRequired int    `json:"volunteersRequired"` 
 	Location           string `json:"location"`
 }

apimodels/unregister_event.go

@@ -0,0 +1,19 @@
+package apimodels
+
+type UnregisterEvent struct {
+	UserID  int `json:"userID"`
+	EventID int `json:"eventID"`
+}
+
+/*
+
+Logic for deregistering user
+
+1. Get context of the user and their ID
+2. Get context of the event and its ID 
+
+4. Check if user is on signup list and remove 
+	5. If not, check if user is on standby list and remove 
+
+*/
+

main.go

@@ -86,4 +86,20 @@ func bind(e *echo.Echo, eventStore store.EventStore) {
 
 		return c.JSON(http.StatusOK, event)
 	})
+
+	e.POST("/api/unregister", func(c echo.Context) error {
+		var request apimodels.UnregisterEvent
+
+		// parse request body
+		bindErr := c.Bind(&request)
+		if bindErr != nil {
+			return c.JSON(http.StatusBadRequest, bindErr)
+		}
+
+		err := eventStore.UnregisterEvent(c.Request().Context(), request.UserID, request.EventID)
+		if err != nil {
+			return c.JSON(http.StatusInternalServerError, map[string]string{"error": err.Error()})
+		}
+		return c.JSON(http.StatusOK, request.UserID) //return userID that was removed if successful
+	})
 }

store/event.go

@@ -2,6 +2,7 @@ package store
 
 import (
 	"context"
+	"database/sql"
 	"fmt"
 	"time"
 
@@ -27,6 +28,7 @@ type EventStore interface {
 	Create(ctx context.Context, name string, description string, start time.Time, end time.Time, volunteers int, location string) (*Event, error)
 	Update(ctx context.Context, event Event) (*Event, error)
 	Delete(ctx context.Context, id int) error
+	UnregisterEvent(ctx context.Context, UserID int, EventID int) error
 }
 
 type pgEventStore struct {
@@ -113,3 +115,30 @@ func (s *pgEventStore) Delete(ctx context.Context, id int) error {
 
 	return nil
 }
+
+
+// unregisters a user from an event 
+func (s *pgEventStore) UnregisterEvent(ctx context.Context, userID int, eventID int) error {
+
+	//returning id of the signUp from event_signups
+	signUpQuery := `DELETE FROM event_signups WHERE user_id = $1 AND event_id = $2 RETURNING id`
+	var signUpID int
+	err := s.db.GetContext(ctx, &signUpID, signUpQuery, userID, eventID)
+
+    if err != nil && err != sql.ErrNoRows {
+        // Handle errors NOT corresponding to a 'no rows' return error 
+        return fmt.Errorf("failed to remove user from event signup list: %w", err)
+    }
+
+	//returning id of the signUp from event_standby 
+	if err == sql.ErrNoRows {
+		var standByID int 
+		standByQuery := `DELETE FROM event_standbys WHERE user_id = $1 AND event_id = $2 RETURNING id`
+		err := s.db.GetContext(ctx, &standByID, standByQuery, userID, eventID)
+
+		if err != nil {
+			return fmt.Errorf("failed to remove user from event standby list: %w", err)
+		}
+	}
+	return nil
+}