tsk-26: Retrieve scheduled message event endpoint (#28)

Closes #26

Reviewed-on: phoenix/textsender-api#28
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/handler/scheduled_message_event.go

@@ -2,7 +2,9 @@ package handler
 
 import (
 	"net/http"
+	"strings"
 
+	"github.com/go-chi/chi/v5"
 	"github.com/google/uuid"
 
 	"git.kundeng.us/phoenix/textsender-api/internal/store"
@@ -20,6 +22,11 @@ type AddScheduledMessageEventResponse struct {
 	Data    []scheduling.ScheduledMessageEvent `json:"data"`
 }
 
+type GetScheduledMessageEventResponse struct {
+	Message string                             `json:"message"`
+	Data    []scheduling.ScheduledMessageEvent `json:"data"`
+}
+
 type ScheduledMessageEventHandler struct {
 	ScheduledMessageEventStore store.ScheduledMessageEventStore
 }
@@ -79,3 +86,41 @@ func (s *ScheduledMessageEventHandler) AddScheduledMessageEvent(w http.ResponseW
 
 	RespondWithJSON(w, statusCode, &resp)
 }
+
+func (s *ScheduledMessageEventHandler) GetScheduledMessageEvent(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Metnot allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	id := chi.URLParam(r, "id")
+	if len(id) == 0 {
+		pathParts := strings.Split(r.URL.Path, "/")
+		if len(pathParts) < 7 {
+			http.Error(w, "Id not provided", http.StatusBadRequest)
+			return
+		} else {
+			id = pathParts[6]
+		}
+	}
+
+	var statusCode int
+	var resp GetScheduledMessageEventResponse
+
+	if parsedId, err := uuid.Parse(id); err != nil {
+		resp.Message = err.Error()
+		statusCode = http.StatusBadRequest
+	} else {
+		ctx := r.Context()
+		if event, err := s.ScheduledMessageEventStore.Get(ctx, parsedId); err != nil {
+			resp.Message = err.Error()
+			statusCode = http.StatusInternalServerError
+		} else {
+			resp.Message = "Successful"
+			statusCode = http.StatusOK
+			resp.Data = append(resp.Data, *event)
+		}
+	}
+
+	RespondWithJSON(w, statusCode, &resp)
+}