import { defineEventHandler } from 'h3';
import {
  buildClaudeAgentEnv,
  getClaudeAgentDebugFilePath,
} from '../../utils/resolve-claude-agent-env';

interface ModelInfo {
  value: string;
  displayName: string;
  description: string;
}

let cachedModels: ModelInfo[] | null = null;

/**
 * Returns the list of available AI models via Claude Agent SDK.
 * Used as a fallback when no providers are explicitly connected.
 */
export default defineEventHandler(async () => {
  if (cachedModels) {
    return { models: cachedModels };
  }

  try {
    const { query } = await import('@anthropic-ai/claude-agent-sdk');

    const env = buildClaudeAgentEnv();
    const debugFile = getClaudeAgentDebugFilePath();

    const q = query({
      prompt: '',
      options: {
        maxTurns: 1,
        tools: [],
        permissionMode: 'plan',
        persistSession: false,
        env,
        ...(debugFile ? { debugFile } : {}),
      },
    });

    const models = await q.supportedModels();
    cachedModels = models;
    q.close();

    return { models };
  } catch (error) {
    const message = error instanceof Error ? error.message : 'Unknown error';
    return { models: [], error: message };
  }
});