assign trainers to trainings

main.go

@@ -241,29 +241,75 @@ func addTrainingAreaHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func fetchTrainings() ([]Training, error) {
-	log.Println("Fetching trainings from the database")
+	log.Println("Fetching trainings with assigned trainers from the database")
-	rows, err := db.Query("SELECT id, title, training_type, mode, strftime('%Y-%m-%d %H:%M:%S', start), strftime('%Y-%m-%d %H:%M:%S', end), status FROM trainings")
+
+	query := `
+		SELECT 
+			t.id, t.title, t.training_type, t.mode, 
+			strftime('%Y-%m-%d %H:%M:%S', t.start), strftime('%Y-%m-%d %H:%M:%S', t.end), t.status,
+			tr.id, tr.name, tr.email
+		FROM trainings t
+		LEFT JOIN training_trainers tt ON t.id = tt.training_id
+		LEFT JOIN trainers tr ON tt.trainer_id = tr.id
+		ORDER BY t.id, tr.name
+	`
+
+	rows, err := db.Query(query)
 	if err != nil {
 		log.Printf("Error fetching trainings: %v", err)
 		return nil, err
 	}
 	defer rows.Close()
 
-	var trainings []Training
+	trainingMap := make(map[int]*Training)
+
 	for rows.Next() {
-		var t Training
+		var trainingID int
-		var start, end string
+		var title, trainingType, mode, status, startStr, endStr string
-		err := rows.Scan(&t.ID, &t.Title, &t.TrainingType, &t.Mode, &start, &end, &t.Status)
+		var trainerID sql.NullInt64
+		var trainerName sql.NullString
+		var trainerEmail sql.NullString
+
+		err := rows.Scan(&trainingID, &title, &trainingType, &mode, &startStr, &endStr, &status,
+			&trainerID, &trainerName, &trainerEmail)
 		if err != nil {
 			log.Printf("Error scanning row for training: %v", err)
 			return nil, err
 		}
-		t.Start, _ = time.Parse(time.DateTime, start)
+
-		t.End, _ = time.Parse(time.DateTime, end)
+		start, _ := time.Parse(time.DateTime, startStr)
-		trainings = append(trainings, t)
+		end, _ := time.Parse(time.DateTime, endStr)
+
+		training, exists := trainingMap[trainingID]
+		if !exists {
+			training = &Training{
+				ID:           trainingID,
+				Title:        title,
+				TrainingType: trainingType,
+				Mode:         mode,
+				Start:        start,
+				End:          end,
+				Status:       status,
+				Trainers:     []Trainer{},
+			}
+			trainingMap[trainingID] = training
+		}
+
+		if trainerID.Valid {
+			training.Trainers = append(training.Trainers, Trainer{
+				ID:    int(trainerID.Int64),
+				Name:  trainerName.String,
+				Email: trainerEmail.String,
+			})
+		}
 	}
 
-	log.Printf("Found %d trainings", len(trainings))
+	var trainings []Training
+	for _, training := range trainingMap {
+		trainings = append(trainings, *training)
+	}
+
+	log.Printf("Found %d trainings with trainers", len(trainings))
 	return trainings, nil
 }
 
@@ -276,7 +322,22 @@ func trainingListHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	err = tmpl.ExecuteTemplate(w, "training_list.html", trainings)
+	trainers, err := fetchTrainers()
+	if err != nil {
+		log.Printf("Error fetching trainers: %v", err)
+		http.Error(w, "Database error", http.StatusInternalServerError)
+		return
+	}
+
+	data := struct {
+		Trainings []Training
+		Trainers  []Trainer
+	}{
+		Trainings: trainings,
+		Trainers:  trainers,
+	}
+
+	err = tmpl.ExecuteTemplate(w, "training_list.html", data)
 	if err != nil {
 		log.Printf("Error in templating page training_list.html: %v", err)
 		http.Error(w, fmt.Sprintf("Error in templating page %v", err), http.StatusInternalServerError)
@@ -562,11 +623,39 @@ func addTrainingHandler(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
+func assignTrainerHandler(w http.ResponseWriter, r *http.Request) {
+	log.Println("Handling trainer assignment to training")
+	if r.Method != http.MethodPost {
+		http.Error(w, "Invalid request method", http.StatusMethodNotAllowed)
+		return
+	}
+
+	trainingID := r.FormValue("training_id")
+	trainerID := r.FormValue("trainer_id")
+
+	if trainingID == "" || trainerID == "" {
+		log.Println("Missing training ID or trainer ID")
+		http.Error(w, "Training ID and Trainer ID are required", http.StatusBadRequest)
+		return
+	}
+
+	_, err := db.Exec("INSERT OR IGNORE INTO training_trainers (training_id, trainer_id) VALUES (?, ?)", trainingID, trainerID)
+	if err != nil {
+		log.Printf("Error assigning trainer to training: %v", err)
+		http.Error(w, "Database error", http.StatusInternalServerError)
+		return
+	}
+
+	log.Println("Trainer assigned to training successfully")
+	http.Redirect(w, r, "/trainings", http.StatusSeeOther)
+}
+
 func initServerHandlers() {
 	http.Handle("/", redirectIfNoAdmin(http.HandlerFunc(homeHandler)))
 
 	http.Handle("/trainings", redirectIfNoAdmin(http.HandlerFunc(trainingListHandler)))
 	http.Handle("/trainings/add", redirectIfNoAdmin(http.HandlerFunc(addTrainingHandler)))
+	http.Handle("/trainings/assign_trainer", redirectIfNoAdmin(http.HandlerFunc(assignTrainerHandler)))
 
 	http.Handle("/trainers", redirectIfNoAdmin(http.HandlerFunc(trainerListHandler)))
 	http.Handle("/trainers/add", redirectIfNoAdmin(http.HandlerFunc(addTrainerHandler)))

templates/training_list.html

@@ -2,7 +2,8 @@
     <p><a href="/trainings/add"><button>Add New Training</button></a></p>
 
     <h1>Trainings</h1>
-    <table border="1">
+<table>
+    <thead>
         <tr>
             <th>Title</th>
             <th>Type</th>
@@ -10,17 +11,81 @@
             <th>Start</th>
             <th>End</th>
             <th>Status</th>
+            <th>Trainers</th>
+            <th>Actions</th>
         </tr>
-        {{ range . }}
+    </thead>
+    <tbody>
+        {{range .Trainings}}
         <tr>
-            <td>{{ .Title }}</td>
+            <td>{{.Title}}</td>
-            <td>{{ .TrainingType }}</td>
+            <td>{{.TrainingType}}</td>
-            <td>{{ .Mode }}</td>
+            <td>{{.Mode}}</td>
-            <td>{{ .Start }}</td>
+            <td>{{.Start.Format "2006-01-02 15:04"}}</td>
-            <td>{{ .End }}</td>
+            <td>{{.End.Format "2006-01-02 15:04"}}</td>
-            <td>{{ .Status }}</td>
+            <td>{{.Status}}</td>
+            <td>
+                {{if .Trainers}}
+                    {{range .Trainers}}
+                        {{.Name}} ({{.Email}})<br>
+                    {{end}}
+                {{else}}
+                    No trainers assigned
+                {{end}}
+            </td>
+            <td>
+                <button onclick="openAssignTrainerModal({{.ID}})">Assign Trainer</button>
+            </td>
         </tr>
-        {{ end }}
+        {{end}}
-    </table>
+    </tbody>
+</table>
+
+<!-- Assign Trainer Modal -->
+<div id="assignTrainerModal" style="display:none; position:fixed; top:50%; left:50%; transform:translate(-50%, -50%); background:white; padding:20px; border:1px solid black;">
+    <h3>Assign Trainer</h3>
+    <form id="assignTrainerForm" >
+        <input type="hidden" id="training_id" name="training_id">
+        <label for="trainer">Select Trainer:</label>
+        <select id="trainer_id" name="trainer_id">
+            {{range .Trainers}}
+            <option value="{{.ID}}">{{.Name}} ({{.Email}})</option>
+            {{end}}
+        </select>
+        <button type="submit">Assign</button>
+        <button type="button" onclick="closeAssignTrainerModal()">Cancel</button>
+    </form>
+</div>
+
+<script>
+    function openAssignTrainerModal(trainingId) {
+        document.getElementById('training_id').value = trainingId;
+        document.getElementById('assignTrainerModal').style.display = 'block';
+    }
+
+    function closeAssignTrainerModal() {
+        document.getElementById('assignTrainerModal').style.display = 'none';
+    }
+
+    document.getElementById('assignTrainerForm').addEventListener('submit', function(event) {
+        event.preventDefault();
+
+        const formData = new FormData(this); // Create FormData from the form element
+        console.log(formData);
+
+        fetch('/trainings/assign_trainer', {
+            method: 'POST',
+            body: formData // Send as form data
+        }).then(response => {
+            if (response.ok) {
+                location.reload();
+            } else {
+                alert('Failed to assign trainer');
+            }
+        });
+    });
+</script>
+
+
 
 {{template "epilogue.html" }}