feat: more llm provider options (google, mistral) (#28)

* feat: add google provider

* fix: default for google model

* feat: multiple providers

* fix: defaults from env for login form

* fix: add mistral to env files

* chore: delete unused code

* chore: revert database url to original

* fix: render default value for api key from env on server

* fix: type errors during compilation

---------

Co-authored-by: Vasily Zubarev <me@vas3k.ru>

models/settings.ts

@@ -1,12 +1,51 @@
 import { prisma } from "@/lib/db"
+import { PROVIDERS } from "@/lib/llm-providers"
 import { cache } from "react"
+import { LLMProvider } from "@/ai/providers/llmProvider"
 
 export type SettingsMap = Record<string, string>
 
+/**
+ * Helper to extract LLM provider settings from SettingsMap.
+ */
+export function getLLMSettings(settings: SettingsMap) {
+  const priorities = (settings.llm_providers || "openai,google,mistral").split(",").map(p => p.trim()).filter(Boolean)
+
+  const providers = priorities.map((provider) => {
+    if (provider === "openai") {
+      return {
+        provider: provider as LLMProvider,
+        apiKey: settings.openai_api_key || "",
+        model: settings.openai_model_name || PROVIDERS[0]['defaultModelName'],
+      }
+    }
+    if (provider === "google") {
+      return {
+        provider: provider as LLMProvider,
+        apiKey: settings.google_api_key || "",
+        model: settings.google_model_name || PROVIDERS[1]['defaultModelName'],
+      }
+    }
+    if (provider === "mistral") {
+      return {
+        provider: provider as LLMProvider,
+        apiKey: settings.mistral_api_key || "",
+        model: settings.mistral_model_name || PROVIDERS[2]['defaultModelName'],
+      }
+    }
+    return null
+  }).filter((provider): provider is NonNullable<typeof provider> => provider !== null)
+
+  return {
+    providers,
+  }
+}
+
 export const getSettings = cache(async (userId: string): Promise<SettingsMap> => {
   const settings = await prisma.setting.findMany({
     where: { userId },
   })
+
   return settings.reduce((acc, setting) => {
     acc[setting.code] = setting.value || ""
     return acc