import { NextResponse } from "next/server";

// POST /api/providers/validate - Validate API key with provider
export async function POST(request) {
  try {
    const body = await request.json();
    const { provider, apiKey } = body;

    if (!provider || !apiKey) {
      return NextResponse.json({ error: "Provider and API key required" }, { status: 400 });
    }

    let isValid = false;
    let error = null;

    // Validate with each provider
    try {
      switch (provider) {
        case "openai":
          const openaiRes = await fetch("https://api.openai.com/v1/models", {
            headers: { "Authorization": `Bearer ${apiKey}` },
          });
          isValid = openaiRes.ok;
          break;

        case "anthropic":
          const anthropicRes = await fetch("https://api.anthropic.com/v1/messages", {
            method: "POST",
            headers: {
              "x-api-key": apiKey,
              "anthropic-version": "2023-06-01",
              "content-type": "application/json",
            },
            body: JSON.stringify({
              model: "claude-3-haiku-20240307",
              max_tokens: 1,
              messages: [{ role: "user", content: "test" }],
            }),
          });
          isValid = anthropicRes.status !== 401;
          break;

        case "gemini":
          const geminiRes = await fetch(`https://generativelanguage.googleapis.com/v1/models?key=${apiKey}`);
          isValid = geminiRes.ok;
          break;

        case "openrouter":
          const openrouterRes = await fetch("https://openrouter.ai/api/v1/models", {
            headers: { "Authorization": `Bearer ${apiKey}` },
          });
          isValid = openrouterRes.ok;
          break;

        case "glm":
        case "kimi":
        case "minimax": {
          const claudeBaseUrls = {
            glm: "https://api.z.ai/api/anthropic/v1/messages",
            kimi: "https://api.kimi.com/coding/v1/messages",
            minimax: "https://api.minimax.io/anthropic/v1/messages",
          };
          const claudeRes = await fetch(claudeBaseUrls[provider], {
            method: "POST",
            headers: {
              "x-api-key": apiKey,
              "anthropic-version": "2023-06-01",
              "content-type": "application/json",
            },
            body: JSON.stringify({
              model: "claude-sonnet-4-20250514",
              max_tokens: 1,
              messages: [{ role: "user", content: "test" }],
            }),
          });
          isValid = claudeRes.status !== 401;
          break;
        }

        default:
          return NextResponse.json({ error: "Provider validation not supported" }, { status: 400 });
      }
    } catch (err) {
      error = err.message;
      isValid = false;
    }

    return NextResponse.json({
      valid: isValid,
      error: isValid ? null : (error || "Invalid API key"),
    });
  } catch (error) {
    console.log("Error validating API key:", error);
    return NextResponse.json({ error: "Validation failed" }, { status: 500 });
  }
}