/**
 * Tavily AI Search - OpenClaw Plugin (OpenClaw 2026 api.registerTool API)
 * Provides web search optimized for AI/LLM consumption.
 * @see https://docs.openclaw.ai/plugins/agent-tools
 */

const https = require('https');

const TAVILY_API_KEY = process.env.TAVILY_API_KEY || '';
const TAVILY_API_HOST = 'api.tavily.com';

function tavilySearch(query, options = {}) {
  const {
    search_depth = 'basic',
    topic = 'general',
    max_results = 5,
    include_answer = true,
    include_raw_content = false,
    include_images = false,
    include_domains = null,
    exclude_domains = null,
  } = options;

  return new Promise((resolve, reject) => {
    const requestBody = JSON.stringify({
      api_key: TAVILY_API_KEY,
      query,
      search_depth,
      topic,
      max_results,
      include_answer,
      include_raw_content,
      include_images,
      include_domains,
      exclude_domains,
    });

    const reqOptions = {
      hostname: TAVILY_API_HOST,
      port: 443,
      path: '/search',
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Content-Length': Buffer.byteLength(requestBody),
      },
    };

    const req = https.request(reqOptions, (res) => {
      let data = '';
      res.on('data', (chunk) => (data += chunk));
      res.on('end', () => {
        try {
          resolve(JSON.parse(data));
        } catch (e) {
          reject(new Error(`Failed to parse Tavily response: ${e.message}`));
        }
      });
    });

    req.on('error', (e) => reject(new Error(`Tavily API request failed: ${e.message}`)));
    req.write(requestBody);
    req.end();
  });
}

/**
 * OpenClaw 2026 plugin entry: register tool via api.registerTool()
 */
function register(api) {
  const hasRegisterTool = typeof api === 'object' && typeof api.registerTool === 'function';
  if (api && api.logger && typeof api.logger.info === 'function') {
    api.logger.info('[Tavily] plugin loaded, hasRegisterTool=' + hasRegisterTool);
  } else {
    console.log('[Tavily] plugin loaded, hasRegisterTool=' + hasRegisterTool);
  }
  if (!hasRegisterTool) {
    // Legacy loader: return tools array for older gateways
    const tool = {
      name: 'tavily_search',
      description: 'AI-optimized web search using Tavily. Best for research, news, fact-checking, and gathering authoritative sources.',
      input_schema: {
        type: 'object',
        properties: {
          query: { type: 'string', description: 'Search query string' },
          search_depth: { type: 'string', enum: ['basic', 'advanced'], default: 'basic' },
          topic: { type: 'string', enum: ['general', 'news'], default: 'general' },
          max_results: { type: 'integer', minimum: 1, maximum: 10, default: 5 },
          include_answer: { type: 'boolean', default: true },
        },
        required: ['query'],
      },
      async execute(params) {
        const out = await runTavily(params);
        return { content: [{ type: 'text', text: typeof out === 'string' ? out : JSON.stringify(out, null, 2) }] };
      },
    };
    return { tools: [tool] };
  }

  api.registerTool(
    {
      name: 'tavily_search',
      description: 'AI-optimized web search using Tavily. Best for research, news, fact-checking, and gathering authoritative sources.',
      parameters: {
        type: 'object',
        properties: {
          query: { type: 'string', description: 'Search query string' },
          search_depth: { type: 'string', enum: ['basic', 'advanced'], description: 'basic (fast) or advanced (comprehensive)', default: 'basic' },
          topic: { type: 'string', enum: ['general', 'news'], description: 'general or news (last 7 days)', default: 'general' },
          max_results: { type: 'integer', minimum: 1, maximum: 10, description: 'Number of results', default: 5 },
          include_answer: { type: 'boolean', description: 'Include AI-generated answer summary', default: true },
        },
        required: ['query'],
      },
      async execute(_id, params) {
        const out = await runTavily(params);
        return { content: [{ type: 'text', text: typeof out === 'string' ? out : JSON.stringify(out, null, 2) }] };
      },
    },
    { optional: true }
  );
  if (api.logger && typeof api.logger.info === 'function') {
    api.logger.info('[Tavily] tavily_search registered via api.registerTool');
  } else {
    console.log('[Tavily] tavily_search registered via api.registerTool');
  }
}

async function runTavily(params) {
  if (!TAVILY_API_KEY) {
    return { success: false, error: 'TAVILY_API_KEY is not set. Set it in openclaw.json env or gateway environment.' };
  }
  const { query, ...options } = params || {};
  try {
    const result = await tavilySearch(query || '', options);
    if (result.error) return { success: false, error: result.error };
    return {
      success: true,
      query: result.query,
      answer: result.answer,
      results: (result.results || []).map((r) => ({ title: r.title, url: r.url, content: r.content, score: r.score })),
      images: result.images || [],
      response_time: result.response_time,
    };
  } catch (err) {
    return { success: false, error: err.message };
  }
}

module.exports = register;