Update participant and study API routes

src/components/participant/Participants.tsx

@@ -0,0 +1,112 @@
+"use client";
+
+import React, { useState, useEffect } from 'react';
+import { Card, CardContent, CardHeader, CardTitle } from "~/components/ui/card";
+import { Button } from "~/components/ui/button";
+import { useStudyContext } from '../../context/StudyContext';
+import { Participant } from '../../types/Participant';
+import { CreateParticipantDialog } from './CreateParticipantDialog';
+import { Trash2 } from 'lucide-react';
+import { useToast } from '~/hooks/use-toast';
+
+export function Participants() {
+  const [participants, setParticipants] = useState<Participant[]>([]);
+  const { selectedStudy } = useStudyContext();
+  const { toast } = useToast();
+
+  useEffect(() => {
+    if (selectedStudy) {
+      fetchParticipants();
+    }
+  }, [selectedStudy]);
+
+  const fetchParticipants = async () => {
+    if (!selectedStudy) return;
+    const response = await fetch(`/api/participants?studyId=${selectedStudy.id}`);
+    const data = await response.json();
+    setParticipants(data);
+  };
+
+  const createParticipant = async (name: string) => {
+    if (!selectedStudy) return;
+    const response = await fetch('/api/participants', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ name, studyId: selectedStudy.id }),
+    });
+    const createdParticipant = await response.json();
+    setParticipants([...participants, createdParticipant]);
+  };
+
+  const deleteParticipant = async (id: number) => {
+    if (!selectedStudy) return;
+    try {
+      console.log(`Attempting to delete participant with ID: ${id}`);
+      const response = await fetch(`/api/participants/${id}`, {
+        method: 'DELETE',
+      });
+      console.log('Delete response:', response);
+
+      const contentType = response.headers.get("content-type");
+      if (contentType && contentType.indexOf("application/json") !== -1) {
+        const result = await response.json();
+        console.log('Delete result:', result);
+
+        if (!response.ok) {
+          throw new Error(result.error || `Failed to delete participant. Status: ${response.status}`);
+        }
+
+        setParticipants(participants.filter(p => p.id !== id));
+        toast({
+          title: "Success",
+          description: "Participant deleted successfully",
+        });
+      } else {
+        const text = await response.text();
+        console.error('Unexpected response:', text);
+        throw new Error(`Unexpected response from server. Status: ${response.status}`);
+      }
+    } catch (error) {
+      console.error('Error deleting participant:', error);
+      toast({
+        title: "Error",
+        description: error instanceof Error ? error.message : 'Failed to delete participant',
+        variant: "destructive",
+      });
+    }
+  };
+
+  if (!selectedStudy) {
+    return <div>Please select a study to manage participants.</div>;
+  }
+
+  return (
+    <Card>
+      <CardHeader className="flex flex-row items-center justify-between space-y-0 pb-2">
+        <CardTitle className="text-2xl font-bold">Participants for {selectedStudy.title}</CardTitle>
+        <CreateParticipantDialog onCreateParticipant={createParticipant} />
+      </CardHeader>
+      <CardContent>
+        {participants.length > 0 ? (
+          <ul className="space-y-2">
+            {participants.map(participant => (
+              <li key={participant.id} className="bg-gray-100 p-2 rounded flex justify-between items-center">
+                <span>{participant.name}</span>
+                <Button 
+                  variant="ghost" 
+                  size="sm" 
+                  onClick={() => deleteParticipant(participant.id)}
+                  className="text-red-500 hover:text-red-700"
+                >
+                  <Trash2 className="h-4 w-4" />
+                </Button>
+              </li>
+            ))}
+          </ul>
+        ) : (
+          <p>No participants added yet.</p>
+        )}
+      </CardContent>
+    </Card>
+  );
+}