/**
 * Save Hook - PostToolUse
 *
 * Pure HTTP client - sends data to worker, worker handles all database operations
 * including privacy checks. This allows the hook to run under any runtime
 * (Node.js or Bun) since it has no native module dependencies.
 */

import { stdin } from 'process';
import { createHookResponse } from './hook-response.js';
import { logger } from '../utils/logger.js';
import { ensureWorkerRunning, getWorkerPort } from '../shared/worker-utils.js';
import { HOOK_TIMEOUTS } from '../shared/hook-constants.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',  // MCP infrastructure
  'SlashCommand',          // Command invocation (observe what it produces, not the call)
  'Skill',                 // Skill invocation (observe what it produces, not the call)
  'TodoWrite',             // Task management meta-tool
  'AskUserQuestion'        // User interaction, not substantive work
]);

/**
 * Save Hook Main Logic - Fire-and-forget HTTP client
 */
async function saveHook(input?: PostToolUseInput): Promise<void> {
  // Ensure worker is running before any other logic
  await ensureWorkerRunning();

  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;
  }

  const port = getWorkerPort();

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

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

  try {
    // Send to worker - worker handles privacy check and database operations
    const response = await fetch(`http://127.0.0.1:${port}/api/sessions/observations`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        claudeSessionId: session_id,
        tool_name,
        tool_input,
        tool_response,
        cwd: cwd || ''
      }),
      signal: AbortSignal.timeout(HOOK_TIMEOUTS.DEFAULT)
    });

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

    logger.debug('HOOK', 'Observation sent successfully', { 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");
    }
    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);
});