Improve student activity registration system

requirements.txt

@@ -1,4 +1,5 @@
 fastapi
 uvicorn
 httpx
-watchfiles
+watchfiles
+pytest

src/app.py

@@ -38,6 +38,42 @@
         "schedule": "Mondays, Wednesdays, Fridays, 2:00 PM - 3:00 PM",
         "max_participants": 30,
         "participants": ["john@mergington.edu", "olivia@mergington.edu"]
+    },
+    "Basketball Team": {
+        "description": "Competitive basketball team for intramural and league play",
+        "schedule": "Mondays and Wednesdays, 4:00 PM - 5:30 PM",
+        "max_participants": 15,
+        "participants": ["alex@mergington.edu"]
+    },
+    "Tennis Club": {
+        "description": "Learn tennis skills and compete in tournaments",
+        "schedule": "Tuesdays and Thursdays, 4:00 PM - 5:00 PM",
+        "max_participants": 10,
+        "participants": ["lucas@mergington.edu", "grace@mergington.edu"]
+    },
+    "Drama Club": {
+        "description": "Perform in theatrical productions and develop acting skills",
+        "schedule": "Wednesdays, 3:30 PM - 5:00 PM",
+        "max_participants": 25,
+        "participants": ["maya@mergington.edu", "james@mergington.edu"]
+    },
+    "Art Studio": {
+        "description": "Explore painting, drawing, and sculpture techniques",
+        "schedule": "Thursdays, 3:30 PM - 5:00 PM",
+        "max_participants": 18,
+        "participants": ["isabella@mergington.edu"]
+    },
+    "Debate Team": {
+        "description": "Develop public speaking and critical thinking skills through debate",
+        "schedule": "Mondays and Fridays, 3:30 PM - 4:30 PM",
+        "max_participants": 16,
+        "participants": ["ethan@mergington.edu", "ava@mergington.edu"]
+    },
+    "Science Club": {
+        "description": "Conduct experiments and explore advanced scientific concepts",
+        "schedule": "Tuesdays, 3:30 PM - 5:00 PM",
+        "max_participants": 20,
+        "participants": ["noah@mergington.edu"]
     }
 }
 
@@ -62,6 +98,25 @@ def signup_for_activity(activity_name: str, email: str):
     # Get the specific activity
     activity = activities[activity_name]
 
+    # Validate student is not already signed up
+    if email in activity["participants"]:
+        raise HTTPException(status_code=400, detail="Student already signed up for this activity")
+
     # Add student
     activity["participants"].append(email)
     return {"message": f"Signed up {email} for {activity_name}"}
+
+
+@app.delete("/activities/{activity_name}/participants")
+def unregister_from_activity(activity_name: str, email: str):
+    """Remove a student from an activity"""
+    if activity_name not in activities:
+        raise HTTPException(status_code=404, detail="Activity not found")
+
+    activity = activities[activity_name]
+
+    if email not in activity["participants"]:
+        raise HTTPException(status_code=404, detail="Participant not found for this activity")
+
+    activity["participants"].remove(email)
+    return {"message": f"Removed {email} from {activity_name}"}

src/static/app.js

@@ -4,6 +4,16 @@ document.addEventListener("DOMContentLoaded", () => {
   const signupForm = document.getElementById("signup-form");
   const messageDiv = document.getElementById("message");
 
+  function showMessage(text, type) {
+    messageDiv.textContent = text;
+    messageDiv.className = type;
+    messageDiv.classList.remove("hidden");
+
+    setTimeout(() => {
+      messageDiv.classList.add("hidden");
+    }, 5000);
+  }
+
   // Function to fetch activities from API
   async function fetchActivities() {
     try {
@@ -12,19 +22,46 @@ document.addEventListener("DOMContentLoaded", () => {
 
       // Clear loading message
       activitiesList.innerHTML = "";
+      activitySelect.innerHTML = '<option value="">-- Select an activity --</option>';
 
       // Populate activities list
       Object.entries(activities).forEach(([name, details]) => {
         const activityCard = document.createElement("div");
         activityCard.className = "activity-card";
 
         const spotsLeft = details.max_participants - details.participants.length;
+        const participantsMarkup = details.participants.length
+          ? details.participants
+              .map(
+                (participant) => `
+                  <li class="participant-item">
+                    <span class="participant-email">${participant}</span>
+                    <button
+                      class="participant-delete-button"
+                      type="button"
+                      data-activity="${encodeURIComponent(name)}"
+                      data-email="${encodeURIComponent(participant)}"
+                      aria-label="Unregister ${participant} from ${name}"
+                    >
+                      <svg viewBox="0 0 24 24" aria-hidden="true" focusable="false">
+                        <path d="M9 3h6l1 2h4v2H4V5h4l1-2zm1 6h2v8h-2V9zm4 0h2v8h-2V9zM7 9h2v8H7V9zm-1 11h12l1-12H5l1 12z" />
+                      </svg>
+                    </button>
+                  </li>
+                `
+              )
+              .join("")
+          : '<li class="participant-empty">No students registered yet.</li>';
 
         activityCard.innerHTML = `
           <h4>${name}</h4>
           <p>${details.description}</p>
           <p><strong>Schedule:</strong> ${details.schedule}</p>
           <p><strong>Availability:</strong> ${spotsLeft} spots left</p>
+          <div class="participants-section">
+            <p class="participants-title">Participants</p>
+            <ul class="participants-list">${participantsMarkup}</ul>
+          </div>
         `;
 
         activitiesList.appendChild(activityCard);
@@ -59,25 +96,47 @@ document.addEventListener("DOMContentLoaded", () => {
       const result = await response.json();
 
       if (response.ok) {
-        messageDiv.textContent = result.message;
-        messageDiv.className = "success";
         signupForm.reset();
+        await fetchActivities();
+        showMessage(result.message, "success");
       } else {
-        messageDiv.textContent = result.detail || "An error occurred";
-        messageDiv.className = "error";
+        showMessage(result.detail || "An error occurred", "error");
       }
+    } catch (error) {
+      showMessage("Failed to sign up. Please try again.", "error");
+      console.error("Error signing up:", error);
+    }
+  });
+
+  activitiesList.addEventListener("click", async (event) => {
+    const deleteButton = event.target.closest(".participant-delete-button");
+
+    if (!deleteButton) {
+      return;
+    }
+
+    const activity = decodeURIComponent(deleteButton.dataset.activity);
+    const email = decodeURIComponent(deleteButton.dataset.email);
 
-      messageDiv.classList.remove("hidden");
+    try {
+      const response = await fetch(
+        `/activities/${encodeURIComponent(activity)}/participants?email=${encodeURIComponent(email)}`,
+        {
+          method: "DELETE",
+        }
+      );
 
-      // Hide message after 5 seconds
-      setTimeout(() => {
-        messageDiv.classList.add("hidden");
-      }, 5000);
+      const result = await response.json();
+
+      if (response.ok) {
+        await fetchActivities();
+        showMessage(result.message, "success");
+      } else {
+        showMessage(result.detail || "Unable to unregister participant.", "error");
+      }
     } catch (error) {
-      messageDiv.textContent = "Failed to sign up. Please try again.";
-      messageDiv.className = "error";
-      messageDiv.classList.remove("hidden");
-      console.error("Error signing up:", error);
+      showMessage("Failed to unregister participant. Please try again.", "error");
+      console.error("Error unregistering participant:", error);
     }
   });
 

src/static/styles.css

@@ -60,9 +60,10 @@ section h3 {
 .activity-card {
   margin-bottom: 15px;
   padding: 15px;
-  border: 1px solid #ddd;
-  border-radius: 5px;
-  background-color: #f9f9f9;
+  border: 1px solid #d6def5;
+  border-radius: 14px;
+  background: linear-gradient(180deg, #ffffff 0%, #f5f8ff 100%);
+  box-shadow: 0 10px 24px rgba(26, 35, 126, 0.08);
 }
 
 .activity-card h4 {
@@ -74,6 +75,79 @@ section h3 {
   margin-bottom: 8px;
 }
 
+.participants-section {
+  margin-top: 14px;
+  padding-top: 12px;
+  border-top: 1px solid #dbe4ff;
+}
+
+.participants-title {
+  margin-bottom: 8px;
+  font-size: 0.95rem;
+  font-weight: bold;
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  color: #1a237e;
+}
+
+.participants-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  color: #334155;
+}
+
+.participant-item {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  margin-bottom: 8px;
+  padding: 10px 12px;
+  border-radius: 10px;
+  background-color: rgba(219, 228, 255, 0.55);
+}
+
+.participant-email {
+  overflow-wrap: anywhere;
+  font-weight: 600;
+}
+
+.participant-delete-button {
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  width: 34px;
+  height: 34px;
+  flex-shrink: 0;
+  border-radius: 999px;
+  border: 1px solid #f3b2b2;
+  background: linear-gradient(180deg, #fff5f5 0%, #ffe3e3 100%);
+  color: #b42318;
+  cursor: pointer;
+  transition: transform 0.2s, box-shadow 0.2s, background 0.2s;
+}
+
+.participant-delete-button:hover {
+  transform: translateY(-1px);
+  box-shadow: 0 6px 14px rgba(180, 35, 24, 0.18);
+  background: linear-gradient(180deg, #ffe3e3 0%, #ffc9c9 100%);
+}
+
+.participant-delete-button svg {
+  width: 16px;
+  height: 16px;
+  fill: currentColor;
+}
+
+.participant-empty {
+  padding: 10px 12px;
+  border-radius: 10px;
+  background-color: rgba(219, 228, 255, 0.35);
+  color: #64748b;
+  font-style: italic;
+}
+
 .form-group {
   margin-bottom: 15px;
 }