/**
 * Save Hook - PostToolUse
 * Consolidated entry point + logic
 */

import { stdin } from 'process';
import { SessionStore } from '../services/sqlite/SessionStore.js';
import { createHookResponse } from './hook-response.js';
import { logger } from '../utils/logger.js';
import { ensureWorkerRunning, getWorkerPort } from '../shared/worker-utils.js';

export interface PostToolUseInput {
  session_id: string;
  cwd: string;
  tool_name: string;
  tool_input: any;
  tool_response: any;
  [key: string]: any;
}

// Tools to skip (low value or too frequent)
const SKIP_TOOLS = new Set([
  'ListMcpResourcesTool'
]);

/**
 * Save Hook Main Logic
 */
async function saveHook(input?: PostToolUseInput): Promise<void> {
  if (!input) {
    throw new Error('saveHook requires input');
  }

  const { session_id, cwd, tool_name, tool_input, tool_response } = input;

  if (SKIP_TOOLS.has(tool_name)) {
    console.log(createHookResponse('PostToolUse', true));
    return;
  }

  // Ensure worker is running
  await ensureWorkerRunning();

  const db = new SessionStore();

  // Get or create session
  const sessionDbId = db.createSDKSession(session_id, '', '');
  const promptNumber = db.getPromptCounter(sessionDbId);
  db.close();

  const toolStr = logger.formatTool(tool_name, tool_input);

  const port = getWorkerPort();

  logger.dataIn('HOOK', `PostToolUse: ${toolStr}`, {
    sessionId: sessionDbId,
    workerPort: port
  });

  try {
    const response = await fetch(`http://127.0.0.1:${port}/sessions/${sessionDbId}/observations`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        tool_name,
        tool_input: tool_input !== undefined ? JSON.stringify(tool_input) : '{}',
        tool_response: tool_response !== undefined ? JSON.stringify(tool_response) : '{}',
        prompt_number: promptNumber,
        cwd: cwd || ''
      }),
      signal: AbortSignal.timeout(2000)
    });

    if (!response.ok) {
      const errorText = await response.text();
      logger.failure('HOOK', 'Failed to send observation', {
        sessionId: sessionDbId,
        status: response.status
      }, errorText);
      throw new Error(`Failed to send observation to worker: ${response.status} ${errorText}`);
    }

    logger.debug('HOOK', 'Observation sent successfully', { sessionId: sessionDbId, toolName: tool_name });
  } catch (error: any) {
    // Only show restart message for connection errors, not HTTP errors
    if (error.cause?.code === 'ECONNREFUSED' || error.name === 'TimeoutError' || error.message.includes('fetch failed')) {
      throw new Error("There's a problem with the worker. If you just updated, type `pm2 restart claude-mem-worker` in your terminal to continue");
    }
    // Re-throw HTTP errors and other errors as-is
    throw error;
  }

  console.log(createHookResponse('PostToolUse', true));
}

// Entry Point
let input = '';
stdin.on('data', (chunk) => input += chunk);
stdin.on('end', async () => {
  const parsed = input ? JSON.parse(input) : undefined;
  await saveHook(parsed);
});