import { NextResponse } from "next/server";
import { z } from "zod";
import { generateLlmText } from "@/lib/llm-client";
import { isLlmConfigReady, normalizeLlmConfig } from "@/lib/llm-config";

const RequestSchema = z.object({
  llmConfig: z.object({
    apiKey: z.string().optional(),
    baseUrl: z.string().optional(),
    model: z.string().optional(),
  }),
});

export async function POST(req: Request) {
  const json = await req.json().catch(() => null);
  const parsed = RequestSchema.safeParse(json);

  if (!parsed.success) {
    return NextResponse.json(
      { ok: false, status: "error", message: "Bad request." },
      { status: 400 },
    );
  }

  if (!isLlmConfigReady(parsed.data.llmConfig)) {
    return NextResponse.json({
      ok: false,
      status: "idle",
      message: "Add API key, base URL, and model to test the connection.",
    });
  }

  const config = normalizeLlmConfig(parsed.data.llmConfig);

  try {
    const result = await generateLlmText({
      config,
      systemPrompt:
        "You are running a connection test. Reply with a short confirmation only.",
      userPrompt:
        "Connection test. Reply with exactly: Connected to the configured model.",
      temperature: 0,
      maxTokens: 60,
    });

    return NextResponse.json({
      ok: true,
      status: "connected",
      message: result.text,
      model: config.model,
      endpoint: result.endpoint,
    });
  } catch (error) {
    return NextResponse.json({
      ok: false,
      status: "error",
      message: String(error),
      model: config.model,
    });
  }
}