#!/usr/bin/env node

/**
 * SAP AI Provider - Generate Text Example
 *
 * This example demonstrates basic text generation with different models
 * using the Vercel AI SDK's generateText function.
 *
 * Authentication:
 * - On SAP BTP: Automatically uses service binding (VCAP_SERVICES)
 * - Locally: Set AICORE_SERVICE_KEY environment variable with your service key JSON
 */

import { generateText } from "ai";
import { createSAPAIProvider } from "../src/index";
import "dotenv/config";

await (async () => {
  console.log("📝 SAP AI Text Generation Example\n");

  // Verify AICORE_SERVICE_KEY is set for local development
  if (!process.env.AICORE_SERVICE_KEY && !process.env.VCAP_SERVICES) {
    console.warn(
      "⚠️  Warning: AICORE_SERVICE_KEY environment variable not set.",
    );
    console.warn(
      "   Set it in your .env file or environment for local development.\n",
    );
  }

  const provider = createSAPAIProvider();

  // Generate text with GPT-4o
  console.log("🤖 Testing gpt-4o...");
  const { text, usage, finishReason } = await generateText({
    model: provider("gpt-4o"),
    messages: [
      {
        role: "user",
        content: "How to make a delicious mashed potatoes?",
      },
    ],
  });

  console.log("📄 Response:", text);
  console.log(
    "📊 Usage:",
    `${String(usage.inputTokens)} input + ${String(usage.outputTokens)} output = ${String(usage.totalTokens)} total tokens`,
  );
  console.log("🏁 Finish reason:", finishReason);

  // Test multiple models (Harmonized API)
  console.log("\n================================");
  console.log("Testing Multiple Models (Harmonized API)");
  console.log("================================\n");

  const models = ["gemini-2.0-flash", "anthropic--claude-3.5-sonnet"];

  for (const modelId of models) {
    console.log(`\n🤖 Testing ${modelId}...`);
    try {
      const {
        text: modelText,
        usage: modelUsage,
        finishReason: modelFinish,
      } = await generateText({
        model: provider(modelId),
        messages: [
          {
            role: "user",
            content: "What is 2 + 2? Reply with just the number.",
          },
        ],
      });
      console.log("📄 Response:", modelText);
      console.log(
        "📊 Usage:",
        `${String(modelUsage.inputTokens)} input + ${String(modelUsage.outputTokens)} output`,
      );
      console.log("🏁 Finish reason:", modelFinish);
    } catch (error) {
      const errorMessage =
        error instanceof Error ? error.message : String(error);
      console.log(`❌ Error with ${modelId}:`, errorMessage);
    }
  }

  console.log("\n✅ All tests completed!");
})();