initial_commit

frontend/src/api/client.ts

@@ -0,0 +1,69 @@
+export interface SessionInfo {
+  id: string
+  title: string
+  model: string
+  updated_at: string
+}
+
+export interface SSEChunk {
+  type: 'session_id' | 'chunk' | 'done'
+  value?: string
+}
+
+const BASE = ''
+
+export async function fetchSessions(): Promise<SessionInfo[]> {
+  const res = await fetch(`${BASE}/chat/sessions`)
+  if (!res.ok) throw new Error('Failed to fetch sessions')
+  return res.json()
+}
+
+export async function deleteSession(sessionId: string): Promise<void> {
+  await fetch(`${BASE}/chat/sessions/${sessionId}`, { method: 'DELETE' })
+}
+
+export function streamChat(
+  message: string,
+  sessionId: string | null,
+  model: string,
+  onChunk: (chunk: SSEChunk) => void,
+  onError: (err: Error) => void,
+): () => void {
+  const controller = new AbortController()
+
+  fetch(`${BASE}/chat/stream`, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json' },
+    body: JSON.stringify({ message, session_id: sessionId, model }),
+    signal: controller.signal,
+  })
+    .then(async (res) => {
+      if (!res.body) throw new Error('No response body')
+      const reader = res.body.getReader()
+      const decoder = new TextDecoder()
+      let buffer = ''
+
+      while (true) {
+        const { done, value } = await reader.read()
+        if (done) break
+        buffer += decoder.decode(value, { stream: true })
+        const lines = buffer.split('\n\n')
+        buffer = lines.pop() ?? ''
+        for (const line of lines) {
+          if (line.startsWith('data: ')) {
+            try {
+              const parsed: SSEChunk = JSON.parse(line.slice(6))
+              onChunk(parsed)
+            } catch {
+              // ignore malformed
+            }
+          }
+        }
+      }
+    })
+    .catch((err) => {
+      if (err.name !== 'AbortError') onError(err)
+    })
+
+  return () => controller.abort()
+}