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>

.env.example

@@ -9,6 +9,12 @@ DATABASE_URL="postgresql://user@localhost:5432/taxhacker"
 OPENAI_MODEL_NAME="gpt-4o-mini"
 OPENAI_API_KEY=""  # "sk-..."
 
+GOOGLE_MODEL_NAME="gemini-2.5-flash"
+GOOGLE_API_KEY=""
+
+MISTRAL_MODEL_NAME="mistral-medium-latest"
+MISTRAL_API_KEY=""
+
 # Auth Config
 BETTER_AUTH_SECRET="random-secret-key"  # please use any long random string here
 

README.md

@@ -152,8 +152,12 @@ Configure TaxHacker to suit your needs with these environment variables:
 | `SELF_HOSTED_MODE` | No | Set it to "true" if you're self-hosting the app: it enables auto-login, custom API keys, and more | `true` |
 | `DISABLE_SIGNUP` | No | Disable new user registration on your instance | `false` |
 | `BETTER_AUTH_SECRET` | Yes | Secret key for authentication (min 16 characters) | `random-secret-key` |
-| `OPENAI_MODEL_NAME` | No | OpenAI model to use for AI features | `gpt-4o-mini` |
-| `OPENAI_API_KEY` | No | OpenAI API key for AI features. In self-hosted mode you can set it up in settings too. | `sk-...` |
+
+You can also specify LLM provider options in settings or with environment variables:
+
+- For OpenAI: `OPENAI_MODEL_NAME` and `OPENAI_API_KEY`
+- For Google: `GOOGLE_MODEL_NAME` and `GOOGLE_API_KEY`
+- For Mistral: `MISTRAL_MODEL_NAME` and `MISTRAL_API_KEY`
 
 
 ## ⌨️ Local Development

ai/analyze.ts

@@ -1,10 +1,10 @@
 "use server"
 
 import { ActionState } from "@/lib/actions"
-import config from "@/lib/config"
-import OpenAI from "openai"
 import { AnalyzeAttachment } from "./attachments"
 import { updateFile } from "@/models/files"
+import { getSettings, getLLMSettings } from "@/models/settings"
+import { requestLLM } from "./providers/llmProvider"
 
 export type AnalysisResult = {
   output: Record<string, string>
@@ -15,52 +15,39 @@ export async function analyzeTransaction(
   prompt: string,
   schema: Record<string, unknown>,
   attachments: AnalyzeAttachment[],
-  apiKey: string,
   fileId: string,
   userId: string
 ): Promise<ActionState<AnalysisResult>> {
-  const openai = new OpenAI({
-    apiKey,
-  })
-  console.log("RUNNING AI ANALYSIS")
-  console.log("PROMPT:", prompt)
-  console.log("SCHEMA:", schema)
+
+  const settings = await getSettings(userId)
+  const llmSettings = getLLMSettings(settings)
 
   try {
-    const response = await openai.responses.create({
-      model: config.ai.modelName,
-      input: [
-        {
-          role: "user",
-          content: prompt,
-        },
-        {
-          role: "user",
-          content: attachments.map((attachment) => ({
-            type: "input_image",
-            detail: "auto",
-            image_url: `data:${attachment.contentType};base64,${attachment.base64}`,
-          })),
-        },
-      ],
-      text: {
-        format: {
-          type: "json_schema",
-          name: "transaction",
-          schema: schema,
-          strict: true,
-        },
-      },
+    const response = await requestLLM(llmSettings, {
+      prompt,
+      schema,
+      attachments,
     })
 
-    console.log("ChatGPT response:", response.output_text)
-    console.log("ChatGPT tokens used:", response.usage)
+    if (response.error) {
+      throw new Error(response.error)
+    }
 
-    const result = JSON.parse(response.output_text)
+    const result = response.output
+    const tokensUsed = response.tokensUsed || 0
+
+    console.log("LLM response:", result)
+    console.log("LLM tokens used:", tokensUsed)
 
     await updateFile(fileId, userId, { cachedParseResult: result })
 
-    return { success: true, data: { output: result, tokensUsed: response.usage?.total_tokens || 0 } }
+    return {
+      success: true,
+      data: {
+        output: result,
+        tokensUsed: tokensUsed
+      },
+    }
   } catch (error) {
     console.error("AI Analysis error:", error)
     return {

ai/providers/llmProvider.ts

@@ -0,0 +1,115 @@
+import { ChatOpenAI } from "@langchain/openai"
+import { ChatGoogleGenerativeAI } from "@langchain/google-genai"
+import { ChatMistralAI } from "@langchain/mistralai"
+import { BaseMessage, HumanMessage } from "@langchain/core/messages"
+
+export type LLMProvider = "openai" | "google" | "mistral"
+
+export interface LLMConfig {
+  provider: LLMProvider
+  apiKey: string
+  model: string
+}
+
+export interface LLMSettings {
+  providers: LLMConfig[]
+}
+
+export interface LLMRequest {
+  prompt: string
+  schema?: Record<string, unknown>
+  attachments?: any[]
+}
+
+export interface LLMResponse {
+  output: Record<string, string>
+  tokensUsed?: number
+  provider: LLMProvider
+  error?: string
+}
+
+async function requestLLMUnified(config: LLMConfig, req: LLMRequest): Promise<LLMResponse> {
+  try {
+    const temperature = 0;
+    let model: any;
+    if (config.provider === "openai") {
+      model = new ChatOpenAI({
+        apiKey: config.apiKey,
+        model: config.model,
+        temperature: temperature,
+      });
+    } else if (config.provider === "google") {
+      model = new ChatGoogleGenerativeAI({
+        apiKey: config.apiKey,
+        model: config.model,
+        temperature: temperature,
+      });
+    } else if (config.provider === "mistral") {
+      model = new ChatMistralAI({
+        apiKey: config.apiKey,
+        model: config.model,
+        temperature: temperature,
+      });
+    } else {
+      return {
+        output: {},
+        provider: config.provider,
+        error: "Unknown provider",
+      };
+    }
+
+    const structuredModel = model.withStructuredOutput(req.schema, { 'name': 'transaction'});
+
+    let message_content: any = [{ type: "text", text: req.prompt }];
+    if (req.attachments && req.attachments.length > 0) {
+      const images = req.attachments.map(att => ({
+        type: "image_url",
+        image_url: {
+          url: `data:${att.contentType};base64,${att.base64}`
+        },
+      }));
+      message_content.push(...images);
+    }
+    const messages: BaseMessage[] = [
+      new HumanMessage({ content: message_content })
+    ];
+
+    const response = await structuredModel.invoke(messages);
+
+    return {
+      output: response,
+      provider: config.provider,
+    };
+  } catch (error: any) {
+    return {
+      output: {},
+      provider: config.provider,
+      error: error instanceof Error ? error.message : `${config.provider} request failed`,
+    };
+  }
+}
+
+export async function requestLLM(settings: LLMSettings, req: LLMRequest): Promise<LLMResponse> {
+  for (const config of settings.providers) {
+    if (!config.apiKey || !config.model) {
+      console.info('Skipping provider:', config.provider);
+      continue;
+    }
+    console.info('Use provider:', config.provider);
+
+    const response = await requestLLMUnified(config, req);
+
+    if (!response.error) {
+      return response;
+    }
+    else {
+      console.error(response.error)
+    }
+  }
+
+  return {
+    output: {},
+    provider: settings.providers[0]?.provider || "openai",
+    error: "All LLM providers failed or are not configured",
+  };
+}

app/(app)/unsorted/actions.ts

@@ -31,20 +31,15 @@ export async function analyzeFileAction(
   const user = await getCurrentUser()
 
   if (!file || file.userId !== user.id) {
-    return { success: false, error: "File not found or does not belong to the user" }
-  }
-
-  const apiKey = settings.openai_api_key || config.ai.openaiApiKey || ""
-  if (!apiKey) {
-    return { success: false, error: "OpenAI API key is not set" }
-  }
-
-  if (isAiBalanceExhausted(user)) {
-    return {
-      success: false,
-      error: "You used all of your pre-paid AI scans, please upgrade your account or buy new subscription plan",
+      return { success: false, error: "File not found or does not belong to the user" }
+    }
+
+    if (isAiBalanceExhausted(user)) {
+      return {
+        success: false,
+        error: "You used all of your pre-paid AI scans, please upgrade your account or buy new subscription plan",
+      }
     }
-  }
 
   if (isSubscriptionExpired(user)) {
     return {
@@ -70,7 +65,7 @@ export async function analyzeFileAction(
 
   const schema = fieldsToJsonSchema(fields)
 
-  const results = await analyzeTransaction(prompt, schema, attachments, apiKey, file.id, user.id)
+  const results = await analyzeTransaction(prompt, schema, attachments, file.id, user.id)
 
   console.log("Analysis results:", results)
 

app/(app)/unsorted/page.tsx

@@ -38,14 +38,14 @@ export default async function UnsortedPage() {
         {files.length > 1 && <AnalyzeAllButton />}
       </header>
 
-      {config.selfHosted.isEnabled && !settings.openai_api_key && (
+      {config.selfHosted.isEnabled && !settings.openai_api_key && !settings.google_api_key && !settings.mistral_api_key && (
         <Alert>
           <Settings className="h-4 w-4 mt-2" />
           <div className="flex flex-row justify-between pt-2">
             <div className="flex flex-col">
-              <AlertTitle>ChatGPT API Key is required for analyzing files</AlertTitle>
+              <AlertTitle>LLM provider API Key is required for analyzing files</AlertTitle>
               <AlertDescription>
-                Please set your OpenAI API key in the settings to use the analyze form.
+                Please set your LLM provider API key in the settings to use the analyze form.
               </AlertDescription>
             </div>
             <Link href="/settings/llm">

app/(auth)/actions.ts

@@ -13,11 +13,20 @@ export async function selfHostedGetStartedAction(formData: FormData) {
     await createUserDefaults(user.id)
   }
 
-  const openaiApiKey = formData.get("openai_api_key")
-  if (openaiApiKey) {
-    await updateSettings(user.id, "openai_api_key", openaiApiKey as string)
+  const apiKeys = [
+    "openai_api_key",
+    "google_api_key",
+    "mistral_api_key"
+  ]
+
+  for (const key of apiKeys) {
+    const value = formData.get(key)
+    if (value) {
+      await updateSettings(user.id, key, value as string)
+    }
   }
 
+
   const defaultCurrency = formData.get("default_currency")
   if (defaultCurrency) {
     await updateSettings(user.id, "default_currency", defaultCurrency as string)

app/(auth)/self-hosted/page.tsx

@@ -1,15 +1,12 @@
-import { FormSelectCurrency } from "@/components/forms/select-currency"
-import { FormInput } from "@/components/forms/simple"
-import { Button } from "@/components/ui/button"
 import { Card, CardDescription, CardTitle } from "@/components/ui/card"
 import { ColoredText } from "@/components/ui/colored-text"
 import config from "@/lib/config"
-import { DEFAULT_CURRENCIES, DEFAULT_SETTINGS } from "@/models/defaults"
 import { getSelfHostedUser } from "@/models/users"
 import { ShieldAlert } from "lucide-react"
 import Image from "next/image"
 import { redirect } from "next/navigation"
-import { selfHostedGetStartedAction } from "../actions"
+import { PROVIDERS } from "@/lib/llm-providers"
+import SelfHostedSetupFormClient from "./setup-form-client"
 
 export default async function SelfHostedWelcomePage() {
   if (!config.selfHosted.isEnabled) {
@@ -35,6 +32,14 @@ export default async function SelfHostedWelcomePage() {
     redirect(config.selfHosted.redirectUrl)
   }
 
+  // Собираем дефолтные ключи для всех провайдеров
+  const defaultProvider = PROVIDERS[0].key
+  const defaultApiKeys: Record<string, string> = {
+    openai: config.ai.openaiApiKey ?? "",
+    google: config.ai.googleApiKey ?? "",
+    mistral: config.ai.mistralApiKey ?? "",
+  }
+
   return (
     <Card className="w-full max-w-xl mx-auto p-8 flex flex-col items-center justify-center gap-4">
       <Image src="/logo/512.png" alt="Logo" width={144} height={144} className="w-36 h-36" />
@@ -43,36 +48,7 @@ export default async function SelfHostedWelcomePage() {
       </CardTitle>
       <CardDescription className="flex flex-col gap-4 text-center text-lg">
         <p>Welcome to your own instance of TaxHacker. Let&apos;s set up a couple of settings to get started.</p>
-
-        <form action={selfHostedGetStartedAction} className="flex flex-col gap-8 pt-8">
-          <div>
-            <FormInput title="OpenAI API Key" name="openai_api_key" defaultValue={config.ai.openaiApiKey} />
-
-            <small className="text-xs text-muted-foreground">
-              Get your API key from{" "}
-              <a
-                href="https://platform.openai.com/settings/organization/api-keys"
-                target="_blank"
-                className="underline"
-              >
-                OpenAI Platform Console
-              </a>
-            </small>
-          </div>
-
-          <div className="flex flex-row items-center justify-center gap-2">
-            <FormSelectCurrency
-              title="Default Currency"
-              name="default_currency"
-              defaultValue={DEFAULT_SETTINGS.find((s) => s.code === "default_currency")?.value ?? "EUR"}
-              currencies={DEFAULT_CURRENCIES}
-            />
-          </div>
-
-          <Button type="submit" className="w-auto p-6">
-            Get Started
-          </Button>
-        </form>
+        <SelfHostedSetupFormClient defaultProvider={defaultProvider} defaultApiKeys={defaultApiKeys} />
       </CardDescription>
     </Card>
   )

app/(auth)/self-hosted/setup-form-client.tsx

@@ -0,0 +1,76 @@
+"use client"
+import { useState, useRef, useEffect, useCallback } from "react"
+import { FormSelectCurrency } from "@/components/forms/select-currency"
+import { FormInput } from "@/components/forms/simple"
+import { Button } from "@/components/ui/button"
+import { DEFAULT_CURRENCIES, DEFAULT_SETTINGS } from "@/models/defaults"
+import { selfHostedGetStartedAction } from "../actions"
+import { FormSelect } from "@/components/forms/simple"
+import { PROVIDERS } from "@/lib/llm-providers"
+
+type Props = {
+  defaultProvider: string
+  defaultApiKeys: Record<string, string>
+}
+
+export default function SelfHostedSetupFormClient({ defaultProvider, defaultApiKeys }: Props) {
+  const [provider, setProvider] = useState(defaultProvider)
+  const selected = PROVIDERS.find(p => p.key === provider)!
+  const getDefaultApiKey = useCallback((providerKey: string) => defaultApiKeys[providerKey] ?? "", [defaultApiKeys])
+
+  const [apiKey, setApiKey] = useState(getDefaultApiKey(provider))
+  const userTyped = useRef(false)
+
+  useEffect(() => {
+    if (!userTyped.current) {
+      setApiKey(getDefaultApiKey(provider))
+    }
+    userTyped.current = false
+  }, [provider, getDefaultApiKey])
+
+  return (
+    <form action={selfHostedGetStartedAction} className="flex flex-col gap-8 pt-8">
+      <div className="flex flex-row gap-4 items-center justify-center">
+        <FormSelect
+          title="LLM provider"
+          name="provider"
+          value={provider}
+          onValueChange={setProvider}
+          items={PROVIDERS.map(p => ({
+            code: p.key,
+            name: p.label,
+            logo: p.logo
+          }))}
+        />
+        <FormSelectCurrency
+          title="Default Currency"
+          name="default_currency"
+          defaultValue={DEFAULT_SETTINGS.find((s) => s.code === "default_currency")?.value ?? "EUR"}
+          currencies={DEFAULT_CURRENCIES}
+        />
+      </div>
+      <div>
+        <FormInput
+          title={`${selected.label} API Key`}
+          name={selected.apiKeyName}
+          value={apiKey ?? ""}
+          onChange={e => {
+            setApiKey(e.target.value)
+            userTyped.current = true
+          }}
+          placeholder={selected.placeholder}
+        />
+        <small className="text-xs text-muted-foreground flex justify-center mt-2">
+          Get key from
+          {"\u00A0"}
+          <a href={selected.help.url} target="_blank" className="underline">
+            {selected.help.label}
+          </a>
+        </small>
+      </div>
+      <Button type="submit" className="w-auto p-6">
+        Get Started
+      </Button>
+    </form>
+  )
+}

components/forms/simple.tsx

@@ -1,4 +1,5 @@
 "use client"
+import Image from "next/image"
 
 import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
@@ -87,9 +88,10 @@ export const FormSelect = ({
   placeholder,
   hideIfEmpty = false,
   isRequired = false,
+  onValueChange,
   ...props
 }: {
-  items: Array<{ code: string; name: string; color?: string; badge?: string }>
+  items: Array<{ code: string; name: string; color?: string; badge?: string; logo?: string }>
   title?: string
   emptyValue?: string
   placeholder?: string
@@ -105,7 +107,11 @@ export const FormSelect = ({
   return (
     <span className="flex flex-col gap-1">
       {title && <span className="text-sm font-medium">{title}</span>}
-      <Select {...props}>
+      <Select
+        value={props.value}
+        onValueChange={onValueChange}
+        {...props}
+      >
         <SelectTrigger className={cn("w-full min-w-[150px] bg-background", isRequired && isEmpty && "bg-yellow-50")}>
           <SelectValue placeholder={placeholder} />
         </SelectTrigger>
@@ -114,6 +120,9 @@ export const FormSelect = ({
           {items.map((item) => (
             <SelectItem key={item.code} value={item.code}>
               <div className="flex items-center gap-2 text-base pr-2">
+                {item.logo && (
+                  <Image src={item.logo} alt={item.name} width={20} height={20} className="rounded-full" />
+                )}
                 {item.badge && <Badge className="px-2">{item.badge}</Badge>}
                 {!item.badge && item.color && (
                   <div className="w-2 h-2 rounded-full" style={{ backgroundColor: item.color }} />

components/settings/llm-settings-form.tsx

@@ -3,44 +3,91 @@
 import { fieldsToJsonSchema } from "@/ai/schema"
 import { saveSettingsAction } from "@/app/(app)/settings/actions"
 import { FormError } from "@/components/forms/error"
-import { FormInput, FormTextarea } from "@/components/forms/simple"
+import { FormTextarea } from "@/components/forms/simple"
 import { Button } from "@/components/ui/button"
 import { Card, CardTitle } from "@/components/ui/card"
 import { Field } from "@/prisma/client"
-import { CircleCheckBig, Edit } from "lucide-react"
+import { CircleCheckBig, Edit, GripVertical } from "lucide-react"
 import Link from "next/link"
-import { useActionState } from "react"
+import { useState, useActionState } from "react"
+import {
+  DndContext,
+  closestCenter,
+  PointerSensor,
+  useSensor,
+  useSensors
+} from "@dnd-kit/core"
+import type { DragEndEvent } from "@dnd-kit/core";
+import {
+  arrayMove,
+  SortableContext,
+  useSortable,
+  verticalListSortingStrategy
+} from "@dnd-kit/sortable"
+import { PROVIDERS } from "@/lib/llm-providers";
+
+
+function getInitialProviderOrder(settings: Record<string, string>) {
+  let order: string[] = []
+  if (!settings.llm_providers) {
+    order = ['openai', 'google', 'mistral']
+  } else {
+    order = settings.llm_providers.split(",").map(p => p.trim())
+  }
+  // Remove duplicates and keep only valid providers
+  return order.filter((key, idx) => PROVIDERS.some(p => p.key === key) && order.indexOf(key) === idx)
+}
 
 export default function LLMSettingsForm({
   settings,
   fields,
-  showApiKey = true,
 }: {
   settings: Record<string, string>
   fields: Field[]
   showApiKey?: boolean
 }) {
   const [saveState, saveAction, pending] = useActionState(saveSettingsAction, null)
+  const [providerOrder, setProviderOrder] = useState<string[]>(getInitialProviderOrder(settings))
+
+  // Controlled values for each provider
+  const [providerValues, setProviderValues] = useState(() => {
+    const values: Record<string, { apiKey: string; model: string }> = {}
+    PROVIDERS.forEach((provider) => {
+      values[provider.key] = {
+        apiKey: settings[provider.apiKeyName],
+        model: settings[provider.modelName] || provider.defaultModelName,
+      }
+    })
+    return values
+  })
+
+  function handleProviderValueChange(providerKey: string, field: "apiKey" | "model", value: string) {
+    setProviderValues((prev) => ({
+      ...prev,
+      [providerKey]: {
+        ...prev[providerKey],
+        [field]: value,
+      },
+    }))
+  }
 
   return (
     <>
       <form action={saveAction} className="space-y-4">
-        {showApiKey && (
-          <>
-            <FormInput title="OpenAI API Key" name="openai_api_key" defaultValue={settings.openai_api_key} />
 
-            <small className="text-muted-foreground">
-              Get your API key from{" "}
-              <a
-                href="https://platform.openai.com/settings/organization/api-keys"
-                target="_blank"
-                className="underline"
-              >
-                OpenAI Platform Console
-              </a>
-            </small>
-          </>
-        )}
+        <div className="space-y-2">
+          <label className="text-sm font-medium">LLM providers</label>
+          <DndProviderBlocks
+            providerOrder={providerOrder}
+            setProviderOrder={setProviderOrder}
+            providerValues={providerValues}
+            handleProviderValueChange={handleProviderValueChange}
+          />
+          <small className="text-muted-foreground">
+            Drag provider blocks to reorder. First is highest priority.
+          </small>
+        </div>
+        <input type="hidden" name="llm_providers" value={providerOrder.join(",")} />
 
         <FormTextarea
           title="Prompt for File Analysis Form"
@@ -90,3 +137,106 @@ export default function LLMSettingsForm({
     </>
   )
 }
+
+type DndProviderBlocksProps = {
+  providerOrder: string[];
+  setProviderOrder: React.Dispatch<React.SetStateAction<string[]>>;
+  providerValues: Record<string, { apiKey: string; model: string }>;
+  handleProviderValueChange: (providerKey: string, field: "apiKey" | "model", value: string) => void;
+};
+
+function DndProviderBlocks({ providerOrder, setProviderOrder, providerValues, handleProviderValueChange }: DndProviderBlocksProps) {
+  const sensors = useSensors(useSensor(PointerSensor))
+  function handleDragEnd(event: DragEndEvent) {
+    const { active, over } = event
+    if (!over || active.id === over.id) return
+    const oldIndex = providerOrder.indexOf(active.id as string)
+    const newIndex = providerOrder.indexOf(over.id as string)
+    setProviderOrder(arrayMove(providerOrder, oldIndex, newIndex))
+  }
+  return (
+    <DndContext sensors={sensors} collisionDetection={closestCenter} onDragEnd={handleDragEnd}>
+      <SortableContext items={providerOrder} strategy={verticalListSortingStrategy}>
+        {providerOrder.map((providerKey, idx) => (
+          <SortableProviderBlock
+            key={providerKey}
+            id={providerKey}
+            idx={idx}
+            providerKey={providerKey}
+            value={providerValues[providerKey]}
+            handleValueChange={handleProviderValueChange}
+          />
+        ))}
+      </SortableContext>
+    </DndContext>
+  )
+}
+
+type SortableProviderBlockProps = {
+  id: string;
+  idx: number;
+  providerKey: string;
+  value: { apiKey: string; model: string };
+  handleValueChange: (providerKey: string, field: "apiKey" | "model", value: string) => void;
+};
+
+function SortableProviderBlock({ id, idx, providerKey, value, handleValueChange }: SortableProviderBlockProps) {
+  const { attributes, listeners, setNodeRef, transform, transition, isDragging } = useSortable({ id })
+
+  const provider = PROVIDERS.find(p => p.key === providerKey)
+  if (!provider) return null
+  return (
+    <div
+      ref={setNodeRef}
+      style={{
+        transform: transform ? `translateY(${transform.y}px)` : undefined,
+        transition,
+        opacity: isDragging ? 0.6 : 1,
+      }}
+      className={`bg-muted rounded-lg p-4 shadow flex flex-col gap-2 mb-2`}
+    >
+      <div className="flex flex-row items-center gap-2 mb-2">
+        {/* Drag handle */}
+        <span
+          {...attributes}
+          {...listeners}
+          className="cursor-grab p-1 rounded hover:bg-accent transition inline-flex items-center"
+          aria-label="Drag to reorder"
+        >
+          <GripVertical className="w-5 h-5 text-muted-foreground" />
+        </span>
+        <span className="font-semibold">{provider.label}</span>
+      </div>
+      <div className="flex flex-row gap-4 items-center">
+        <input
+          type="text"
+          name={provider.apiKeyName}
+          value={value.apiKey}
+          onChange={e => handleValueChange(provider.key, "apiKey", e.target.value)}
+          className="flex-1 border rounded px-2 py-1"
+          placeholder="API key"
+        />
+        <input
+          type="text"
+          name={provider.modelName}
+          value={value.model}
+          onChange={e => handleValueChange(provider.key, "model", e.target.value)}
+          className="flex-1 border rounded px-2 py-1"
+          placeholder="Model name"
+        />
+      </div>
+      {provider.apiDoc && (
+        <small className="text-muted-foreground">
+          Get your API key from{" "}
+          <a
+            href={provider.apiDoc}
+            target="_blank"
+            className="underline"
+          >
+            {provider.apiDocLabel}
+          </a>
+        </small>
+      )}
+    </div>
+  )
+}

docker-compose.build.yml

@@ -21,6 +21,7 @@ services:
 
   postgres:
     image: postgres:17-alpine
+    container_name: taxhacker-postgres
     environment:
       - POSTGRES_USER=postgres
       - POSTGRES_PASSWORD=postgres

forms/settings.ts

@@ -7,6 +7,12 @@ export const settingsFormSchema = z.object({
   default_category: z.string().optional(),
   default_project: z.string().optional(),
   openai_api_key: z.string().optional(),
+  openai_model_name: z.string().default('gpt-4o-mini'),
+  google_api_key: z.string().optional(),
+  google_model_name: z.string().default("gemini-2.5-flash"),
+  mistral_api_key: z.string().optional(),
+  mistral_model_name: z.string().default("mistral-medium-latest"),
+  llm_providers: z.string().default('openai,google,mistral'),
   prompt_analyse_new_file: z.string().optional(),
   is_welcome_message_hidden: z.string().optional(),
 })

lib/config.ts

@@ -6,6 +6,10 @@ const envSchema = z.object({
   SELF_HOSTED_MODE: z.enum(["true", "false"]).default("true"),
   OPENAI_API_KEY: z.string().optional(),
   OPENAI_MODEL_NAME: z.string().default("gpt-4o-mini"),
+  GOOGLE_API_KEY: z.string().optional(),
+  GOOGLE_MODEL_NAME: z.string().default("gemini-2.5-flash"),
+  MISTRAL_API_KEY: z.string().optional(),
+  MISTRAL_MODEL_NAME: z.string().default("mistral-medium-latest"),
   BETTER_AUTH_SECRET: z
     .string()
     .min(16, "Auth secret must be at least 16 characters")
@@ -50,7 +54,11 @@ const config = {
   },
   ai: {
     openaiApiKey: env.OPENAI_API_KEY,
-    modelName: env.OPENAI_MODEL_NAME,
+    openaiModelName: env.OPENAI_MODEL_NAME,
+    googleApiKey: env.GOOGLE_API_KEY,
+    googleModelName: env.GOOGLE_MODEL_NAME,
+    mistralApiKey: env.MISTRAL_API_KEY,
+    mistralModelName: env.MISTRAL_MODEL_NAME,
   },
   auth: {
     secret: env.BETTER_AUTH_SECRET,

lib/llm-providers.ts

@@ -0,0 +1,47 @@
+export const PROVIDERS = [
+  {
+    key: "openai",
+    label: "OpenAI",
+    apiKeyName: "openai_api_key",
+    modelName: "openai_model_name",
+    defaultModelName: "gpt-4o-mini",
+    apiDoc: "https://platform.openai.com/settings/organization/api-keys",
+    apiDocLabel: "OpenAI Platform Console",
+    placeholder: "sk-...",
+    help: {
+      url: "https://platform.openai.com/settings/organization/api-keys",
+      label: "OpenAI Platform Console"
+    },
+    logo: "/logo/openai.svg"
+  },
+  {
+    key: "google",
+    label: "Google",
+    apiKeyName: "google_api_key",
+    modelName: "google_model_name",
+    defaultModelName: "gemini-2.5-flash",
+    apiDoc: "https://aistudio.google.com/apikey",
+    apiDocLabel: "Google AI Studio",
+    placeholder: "...",
+    help: {
+      url: "https://aistudio.google.com/apikey",
+      label: "Google AI Studio"
+    },
+    logo: "/logo/google.svg"
+  },
+  {
+    key: "mistral",
+    label: "Mistral",
+    apiKeyName: "mistral_api_key",
+    modelName: "mistral_model_name",
+    defaultModelName: "mistral-medium-latest",
+    apiDoc: "https://admin.mistral.ai/organization/api-keys",
+    apiDocLabel: "Mistral Admin Console",
+    placeholder: "...",
+    help: {
+      url: "https://admin.mistral.ai/organization/api-keys",
+      label: "Mistral Admin Console"
+    },
+    logo: "/logo/mistral.svg"
+  },
+]

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

package-lock.json

@@ -8,8 +8,13 @@
       "name": "taxhacker",
       "version": "0.5.5",
       "dependencies": {
+        "@dnd-kit/core": "^6.3.1",
+        "@dnd-kit/sortable": "^10.0.0",
         "@fast-csv/format": "^5.0.2",
         "@fast-csv/parse": "^5.0.2",
+        "@langchain/google-genai": "^0.2.14",
+        "@langchain/mistralai": "^0.2.1",
+        "@langchain/openai": "^0.6.1",
         "@prisma/client": "^6.6.0",
         "@radix-ui/react-avatar": "^1.1.3",
         "@radix-ui/react-checkbox": "^1.1.4",
@@ -31,11 +36,11 @@
         "clsx": "^2.1.1",
         "date-fns": "^3.6.0",
         "jszip": "^3.10.1",
+        "langchain": "^0.3.30",
         "lucide-react": "^0.475.0",
         "mime-types": "^3.0.1",
         "next": "^15.2.4",
         "next-themes": "^0.4.4",
-        "openai": "^4.85.4",
         "pdf2pic": "^3.1.4",
         "react": "^19.0.0",
         "react-day-picker": "^8.10.1",
@@ -364,6 +369,7 @@
       "version": "0.2.5",
       "resolved": "https://registry.npmjs.org/@better-auth/utils/-/utils-0.2.5.tgz",
       "integrity": "sha512-uI2+/8h/zVsH8RrYdG8eUErbuGBk16rZKQfz8CjxQOyCE6v7BqFYEbFwvOkvl1KbUdxhqOnXp78+uE5h8qVEgQ==",
+      "license": "MIT",
       "dependencies": {
         "typescript": "^5.8.2",
         "uncrypto": "^0.1.3"
@@ -374,6 +380,66 @@
       "resolved": "https://registry.npmjs.org/@better-fetch/fetch/-/fetch-1.1.18.tgz",
       "integrity": "sha512-rEFOE1MYIsBmoMJtQbl32PGHHXuG2hDxvEd7rUHE0vCBoFQVSDqaVs9hkZEtHCxRoY+CljXKFCOuJ8uxqw1LcA=="
     },
+    "node_modules/@cfworker/json-schema": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/@cfworker/json-schema/-/json-schema-4.1.1.tgz",
+      "integrity": "sha512-gAmrUZSGtKc3AiBL71iNWxDsyUC5uMaKKGdvzYsBoTW/xi42JQHl7eKV2OYzCUqvc+D2RCcf7EXY2iCyFIk6og==",
+      "license": "MIT",
+      "peer": true
+    },
+    "node_modules/@dnd-kit/accessibility": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/@dnd-kit/accessibility/-/accessibility-3.1.1.tgz",
+      "integrity": "sha512-2P+YgaXF+gRsIihwwY1gCsQSYnu9Zyj2py8kY5fFvUM1qm2WA2u639R6YNVfU4GWr+ZM5mqEsfHZZLoRONbemw==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=16.8.0"
+      }
+    },
+    "node_modules/@dnd-kit/core": {
+      "version": "6.3.1",
+      "resolved": "https://registry.npmjs.org/@dnd-kit/core/-/core-6.3.1.tgz",
+      "integrity": "sha512-xkGBRQQab4RLwgXxoqETICr6S5JlogafbhNsidmrkVv2YRs5MLwpjoF2qpiGjQt8S9AoxtIV603s0GIUpY5eYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@dnd-kit/accessibility": "^3.1.1",
+        "@dnd-kit/utilities": "^3.2.2",
+        "tslib": "^2.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=16.8.0",
+        "react-dom": ">=16.8.0"
+      }
+    },
+    "node_modules/@dnd-kit/sortable": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/@dnd-kit/sortable/-/sortable-10.0.0.tgz",
+      "integrity": "sha512-+xqhmIIzvAYMGfBYYnbKuNicfSsk4RksY2XdmJhT+HAC01nix6fHCztU68jooFiMUB01Ky3F0FyOvhG/BZrWkg==",
+      "license": "MIT",
+      "dependencies": {
+        "@dnd-kit/utilities": "^3.2.2",
+        "tslib": "^2.0.0"
+      },
+      "peerDependencies": {
+        "@dnd-kit/core": "^6.3.0",
+        "react": ">=16.8.0"
+      }
+    },
+    "node_modules/@dnd-kit/utilities": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/@dnd-kit/utilities/-/utilities-3.2.2.tgz",
+      "integrity": "sha512-+MKAJEOfaBe5SmV6t34p80MMKhjvUz0vRrvVJbPT0WElzaOJ/1xs+D+KDv+tD/NE5ujfrChEcshd4fLn0wpiqg==",
+      "license": "MIT",
+      "dependencies": {
+        "tslib": "^2.0.0"
+      },
+      "peerDependencies": {
+        "react": ">=16.8.0"
+      }
+    },
     "node_modules/@emnapi/core": {
       "version": "1.3.1",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.3.1.tgz",
@@ -1035,6 +1101,15 @@
       "integrity": "sha512-MDWhGtE+eHw5JW7lq4qhc5yRLS11ERl1c7Z6Xd0a58DozHES6EnNNwUWbMiG4J9Cgj053Bhk8zvlhFYKVhULwg==",
       "license": "MIT"
     },
+    "node_modules/@google/generative-ai": {
+      "version": "0.24.1",
+      "resolved": "https://registry.npmjs.org/@google/generative-ai/-/generative-ai-0.24.1.tgz",
+      "integrity": "sha512-MqO+MLfM6kjxcKoy0p1wRzG3b4ZZXtPI+z2IE26UogS2Cm/XHO+7gGRBh6gcJsOiIVoH93UwKvW4HdgiOZCy9Q==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18.0.0"
+      }
+    },
     "node_modules/@hexagon/base64": {
       "version": "1.1.28",
       "resolved": "https://registry.npmjs.org/@hexagon/base64/-/base64-1.1.28.tgz",
@@ -1544,12 +1619,185 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@langchain/core": {
+      "version": "0.3.63",
+      "resolved": "https://registry.npmjs.org/@langchain/core/-/core-0.3.63.tgz",
+      "integrity": "sha512-CQfyu4WgwizUhSc1YsDDzzHga6WVhLqeuAyCD4VpGAPa3k3QI+H0b3ECFr/WjJMw0amMtHtfgPWMa1tS7P7qVg==",
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "@cfworker/json-schema": "^4.0.2",
+        "ansi-styles": "^5.0.0",
+        "camelcase": "6",
+        "decamelize": "1.2.0",
+        "js-tiktoken": "^1.0.12",
+        "langsmith": "^0.3.33",
+        "mustache": "^4.2.0",
+        "p-queue": "^6.6.2",
+        "p-retry": "4",
+        "uuid": "^10.0.0",
+        "zod": "^3.25.32",
+        "zod-to-json-schema": "^3.22.3"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/@langchain/core/node_modules/ansi-styles": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
+      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+      "license": "MIT",
+      "peer": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/@langchain/core/node_modules/uuid": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-10.0.0.tgz",
+      "integrity": "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "peer": true,
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
+    "node_modules/@langchain/google-genai": {
+      "version": "0.2.14",
+      "resolved": "https://registry.npmjs.org/@langchain/google-genai/-/google-genai-0.2.14.tgz",
+      "integrity": "sha512-gKe/T2LNh8wSSMJOaFmYd8cwQnDSXKtVtC6a7CFoq5nWuh0bKzhItM/7bue1aMN8mlKfB2G1HCwxhaZoSpS/DA==",
+      "license": "MIT",
+      "dependencies": {
+        "@google/generative-ai": "^0.24.0",
+        "uuid": "^11.1.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@langchain/core": ">=0.3.58 <0.4.0"
+      }
+    },
+    "node_modules/@langchain/google-genai/node_modules/uuid": {
+      "version": "11.1.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.0.tgz",
+      "integrity": "sha512-0/A9rDy9P7cJ+8w1c9WD9V//9Wj15Ce2MPz8Ri6032usz+NfePxx5AcN3bN+r6ZL6jEo066/yNYB3tn4pQEx+A==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/esm/bin/uuid"
+      }
+    },
+    "node_modules/@langchain/mistralai": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/@langchain/mistralai/-/mistralai-0.2.1.tgz",
+      "integrity": "sha512-s91BlNcuxaaZGnVukyl81nwGrWpeE0EYiAdEFoBmZwlT4yLpx+QpPhRsGKrTg/Vm7Nscy6Wd8Xy2PJ93wftMdw==",
+      "license": "MIT",
+      "dependencies": {
+        "@mistralai/mistralai": "^1.3.1",
+        "uuid": "^10.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@langchain/core": ">=0.3.58 <0.4.0"
+      }
+    },
+    "node_modules/@langchain/mistralai/node_modules/uuid": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-10.0.0.tgz",
+      "integrity": "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/bin/uuid"
+      }
+    },
+    "node_modules/@langchain/openai": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/@langchain/openai/-/openai-0.6.1.tgz",
+      "integrity": "sha512-jm8MzMEjAKPReYma4Lewb9vGnocKbhoClqPuRTxtKPDgqQ5yJWSisNy4iZO/a1d6ag/7MnxwKMjVsJdy1cBsxw==",
+      "license": "MIT",
+      "dependencies": {
+        "js-tiktoken": "^1.0.12",
+        "openai": "^5.3.0",
+        "zod": "^3.25.32"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@langchain/core": ">=0.3.58 <0.4.0"
+      }
+    },
+    "node_modules/@langchain/openai/node_modules/openai": {
+      "version": "5.9.2",
+      "resolved": "https://registry.npmjs.org/openai/-/openai-5.9.2.tgz",
+      "integrity": "sha512-d7t/lRkwZpSwIk7GW3EHRSGAlsuoi1WL6VhCO02raEzZO2ahEVAbWn3WmOcpeh9zF6xF9weJXoVeDkWJRz+SHA==",
+      "license": "Apache-2.0",
+      "bin": {
+        "openai": "bin/cli"
+      },
+      "peerDependencies": {
+        "ws": "^8.18.0",
+        "zod": "^3.23.8"
+      },
+      "peerDependenciesMeta": {
+        "ws": {
+          "optional": true
+        },
+        "zod": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@langchain/textsplitters": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/@langchain/textsplitters/-/textsplitters-0.1.0.tgz",
+      "integrity": "sha512-djI4uw9rlkAb5iMhtLED+xJebDdAG935AdP4eRTB02R7OB/act55Bj9wsskhZsvuyQRpO4O1wQOp85s6T6GWmw==",
+      "license": "MIT",
+      "dependencies": {
+        "js-tiktoken": "^1.0.12"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "@langchain/core": ">=0.2.21 <0.4.0"
+      }
+    },
     "node_modules/@levischuck/tiny-cbor": {
       "version": "0.2.11",
       "resolved": "https://registry.npmjs.org/@levischuck/tiny-cbor/-/tiny-cbor-0.2.11.tgz",
       "integrity": "sha512-llBRm4dT4Z89aRsm6u2oEZ8tfwL/2l6BwpZ7JcyieouniDECM5AqNgr/y08zalEIvW3RSK4upYyybDcmjXqAow==",
       "license": "MIT"
     },
+    "node_modules/@mistralai/mistralai": {
+      "version": "1.7.4",
+      "resolved": "https://registry.npmjs.org/@mistralai/mistralai/-/mistralai-1.7.4.tgz",
+      "integrity": "sha512-wty9hHEvIJ5RS8+75NY+a1zXtCCqYQgI26e8R2N7O9ZvD16ep2kF6ciJD2EiWOgS/K+iycRGsrI3nqgkPLG/Xw==",
+      "dependencies": {
+        "zod-to-json-schema": "^3.24.1"
+      },
+      "peerDependencies": {
+        "zod": ">= 3"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "0.2.7",
       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-0.2.7.tgz",
@@ -4124,9 +4372,9 @@
       }
     },
     "node_modules/@sentry/bundler-plugin-core/node_modules/brace-expansion": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.0.1.tgz",
-      "integrity": "sha512-XnAIvQ8eM+kC6aULx6wuQiwVsnzsi9d3WxzV3FpWTGA19F621kwdbsAcFKXgKUHZWsy+mY6iL1sHTxWEFCytDA==",
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