From e837500c6ffcc477222305fd9b952dc9e7a95db1 Mon Sep 17 00:00:00 2001
From: Dave <david.els1@outlook.com>
Date: Wed, 16 Sep 2026 15:53:59 +0200
Subject: [PATCH] feat(ai): single point of provider selection

---
 src/lib/ai/index.ts | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 src/lib/ai/index.ts

diff --git a/src/lib/ai/index.ts b/src/lib/ai/index.ts
new file mode 100644
index 0000000..5a2c7ff
--- /dev/null
+++ b/src/lib/ai/index.ts
@@ -0,0 +1,41 @@
+import "server-only";
+
+import { loadAiSettings } from "@/lib/ai/settings";
+import { buildSystemPrompt } from "@/lib/ai/prompt";
+import { createAnthropicProvider } from "@/lib/ai/provider-anthropic";
+import { createOpenAiCompatibleProvider } from "@/lib/ai/provider-openai";
+import { AiError, type AiProvider } from "@/lib/ai/types";
+
+/**
+ * The only module that decides which provider is active.
+ *
+ * Every consumer asks for `getProvider()` and gets the interface. Nothing else
+ * in the codebase should import an adapter directly — that is what keeps
+ * switching provider a settings change.
+ */
+export async function getProvider(): Promise<AiProvider> {
+  const settings = await loadAiSettings();
+
+  if (!settings?.apiKey) {
+    throw new AiError("No AI provider is configured", false);
+  }
+
+  if (settings.provider === "anthropic") {
+    return createAnthropicProvider(settings.apiKey, settings.model);
+  }
+
+  return createOpenAiCompatibleProvider(
+    settings.apiKey,
+    settings.model,
+    settings.provider
+  );
+}
+
+/** The full system prompt for the current settings. */
+export async function getSystemPrompt(): Promise<string> {
+  const settings = await loadAiSettings();
+  return buildSystemPrompt(settings?.systemPromptExtra ?? "");
+}
+
+export { AiError };
+export type { AiProvider, CompletionRequest, CompletionResult } from "@/lib/ai/types";
\ No newline at end of file