tsk-13: Retrieve scheduled message endpoint (#36)

Closes #13

Reviewed-on: phoenix/textsender-api#36
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/store/mock/scheduled_message_store.go

@@ -47,6 +47,32 @@ func (m *MockScheduledMessageStore) Get(ctx context.Context, id uuid.UUID) (*sch
 	}
 }
 
+func (m *MockScheduledMessageStore) GetWithUserId(ctx context.Context, userId uuid.UUID) ([]*scheduling.ScheduledMessage, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+
+	if m.Error != nil {
+		return nil, m.Error
+	}
+
+	if userId == uuid.Nil {
+		return nil, fmt.Errorf("User Id is nil")
+	} else {
+		var schMsgs []*scheduling.ScheduledMessage
+		for _, schMsg := range m.ScheduledMessages {
+			if schMsg.UserId == userId {
+				schMsgs = append(schMsgs, schMsg)
+			}
+		}
+
+		if len(schMsgs) == 0 {
+			return nil, nil
+		} else {
+			return schMsgs, nil
+		}
+	}
+}
+
 func (m *MockScheduledMessageStore) CreateScheduledMessage(ctx context.Context, schedMsg *scheduling.ScheduledMessage) error {
 	m.mu.Lock()
 	defer m.mu.Unlock()

internal/store/scheduled_message_store.go

@@ -13,6 +13,7 @@ import (
 
 type ScheduledMessageStore interface {
 	Get(ctx context.Context, id uuid.UUID) (*scheduling.ScheduledMessage, error)
+	GetWithUserId(ctx context.Context, userId uuid.UUID) ([]*scheduling.ScheduledMessage, error)
 	CreateScheduledMessage(ctx context.Context, schedMsg *scheduling.ScheduledMessage) error
 	UpdateStatus(ctx context.Context, id uuid.UUID, updatedStatus string) (*string, error)
 }
@@ -44,6 +45,33 @@ func (s *PGScheduledMessageStore) Get(ctx context.Context, id uuid.UUID) (*sched
 	return &schMsg, nil
 }
 
+func (s *PGScheduledMessageStore) GetWithUserId(ctx context.Context, userId uuid.UUID) ([]*scheduling.ScheduledMessage, error) {
+	query := `
+		SELECT id, scheduled, created, status, user_id FROM scheduled_messages WHERE user_id = $1
+	`
+	rows, err := s.db.Query(ctx, query, userId)
+	if err != nil {
+		return nil, fmt.Errorf("Error retrieving rows from scheduled_messages: %w", err)
+	}
+
+	var schMsgs []*scheduling.ScheduledMessage
+
+	for rows.Next() {
+		var schMsg scheduling.ScheduledMessage
+		if err := rows.Scan(&schMsg.Id, &schMsg.Scheduled, &schMsg.Created, &schMsg.Status, &schMsg.UserId); err != nil {
+			return nil, fmt.Errorf("Error fetching data from row: %w", err)
+		} else {
+			schMsgs = append(schMsgs, &schMsg)
+		}
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	} else {
+		return schMsgs, nil
+	}
+}
+
 func (s *PGScheduledMessageStore) CreateScheduledMessage(ctx context.Context, schedMsg *scheduling.ScheduledMessage) error {
 	query := `
 		INSERT INTO scheduled_messages (scheduled, status, user_id)