#!/usr/bin/env node
// Truly Automatic Auto-Capture Hook - Creates snapshots automatically
// This hook creates snapshot files directly via CLI with NO manual intervention
// Snapshots are created every N interactions or when file thresholds are met
//
// SAFETY: Includes graceful failure handling to avoid blocking Claude Code
// if plugin is uninstalled or dependencies are missing.
//
// ORPHAN DETECTION: Periodically checks for orphaned hooks and auto-cleans them

const fs = require('fs');
const path = require('path');

// Graceful failure wrapper - protect against plugin uninstallation
try {
  // Check if critical dependencies exist (indicates plugin is installed)
  const cliLibPath = path.join(__dirname, '../cli/lib');
  if (!fs.existsSync(cliLibPath)) {
    // Plugin likely uninstalled, exit silently
    process.exit(0);
  }

  const LockManager = require('../cli/lib/lock-manager');

// Configuration
const SESSIONS_DIR = '.claude/sessions';
const ACTIVE_SESSION_FILE = path.join(SESSIONS_DIR, '.active-session');
const lockManager = new LockManager(SESSIONS_DIR);

// Living Context Configuration
const CONTEXT_UPDATE_THRESHOLD = 2; // Update context every 2 interactions (lightweight)
const SNAPSHOT_THRESHOLD = 5; // Full snapshot every 5 interactions (heavier)

// Exit early if no active session
if (!fs.existsSync(ACTIVE_SESSION_FILE)) {
  process.exit(0);
}

// Read active session name
let activeSession;
try {
  activeSession = fs.readFileSync(ACTIVE_SESSION_FILE, 'utf8').trim();
} catch (err) {
  process.exit(0);
}

if (!activeSession) {
  process.exit(0);
}

const sessionDir = path.join(SESSIONS_DIR, activeSession);
if (!fs.existsSync(sessionDir)) {
  process.exit(0);
}

// Check if auto-capture is enabled
const sessionMd = path.join(sessionDir, 'session.md');
if (fs.existsSync(sessionMd)) {
  try {
    const content = fs.readFileSync(sessionMd, 'utf8');
    if (content.includes('Auto-capture: disabled')) {
      process.exit(0);
    }
  } catch (err) {
    // Continue if we can't read the file
  }
}

// File paths
const stateFile = path.join(sessionDir, '.auto-capture-state');

// Use lock to prevent race conditions during state read-modify-write
const lock = lockManager.acquireLock(`auto-capture-${activeSession}`, {
  timeout: 1000,
  wait: true
});

if (!lock.acquired) {
  // Could not acquire lock - skip this update to avoid blocking
  // The next interaction will pick up the count
  process.exit(0);
}

try {
  // Initialize state if doesn't exist
  let state = {
    file_count: 0,
    interaction_count: 0,
    interactions_since_context_update: 0,
    interactions_since_snapshot: 0,
    last_context_update: '',
    last_snapshot_timestamp: ''
  };

  if (fs.existsSync(stateFile)) {
    try {
      state = JSON.parse(fs.readFileSync(stateFile, 'utf8'));
      // Ensure Living Context fields exist
      state.interactions_since_context_update = state.interactions_since_context_update || 0;
      state.interactions_since_snapshot = state.interactions_since_snapshot || 0;
      state.last_context_update = state.last_context_update || '';
      state.last_snapshot_timestamp = state.last_snapshot_timestamp || '';
    } catch (err) {
      // Use default state if parse fails
    }
  }

  // Increment interaction count
  state.interaction_count++;
  state.interactions_since_context_update++;
  state.interactions_since_snapshot++;

  // INCREMENTAL LOGGING SYSTEM: Log conversation for later consolidation
  // This replaces the blocking snapshot system with fast (~1-2ms) logging
  const timestamp = new Date().toISOString();

  // Read stdin to get transcript path and user prompt
  let transcriptPath = null;
  let userPrompt = null;
  try {
    const stdinData = fs.readFileSync(0, 'utf8').trim();
    if (stdinData) {
      const eventData = JSON.parse(stdinData);
      transcriptPath = eventData.transcript_path || null;
      userPrompt = eventData.prompt || null;
    }
  } catch (stdinErr) {
    // If we can't read stdin, continue without transcript path
    // This ensures hook doesn't fail if stdin format changes
  }

  // Log interaction incrementally (non-blocking, ~1-2ms)
  try {
    const ConversationLogger = require('../cli/lib/conversation-logger');
    const logger = new ConversationLogger(sessionDir);

    logger.logInteraction({
      num: state.interaction_count,
      timestamp: timestamp,
      transcript_path: transcriptPath,
      user_prompt: userPrompt,
      state: state,
      modified_files: state.modified_files || []
    });
  } catch (err) {
    // Silent failure - don't block hook execution
    // Consolidation will work with whatever data is available
  }

  // Note: Snapshot consolidation now happens at session start/continue
  // via consolidate-worker.js running in background
  // This eliminates the 10-15 second blocking issue

  // Update state file atomically
  const tempPath = `${stateFile}.tmp.${Date.now()}`;
  try {
    fs.writeFileSync(tempPath, JSON.stringify(state, null, 2));
    fs.renameSync(tempPath, stateFile);
  } catch (writeError) {
    // Clean up temp file
    if (fs.existsSync(tempPath)) {
      try {
        fs.unlinkSync(tempPath);
      } catch (cleanupError) {
        // Ignore
      }
    }
    throw writeError;
  }
  } finally {
    // Always release lock
    lock.release();
  }

  // ORPHAN DETECTION: Check for orphaned hooks every 20 prompts
  // This auto-cleans up hooks if plugin was uninstalled without cleanup
  try {
    const orphanCheckFile = path.join(SESSIONS_DIR, '.orphan-check-counter');
    let checkCounter = 0;

    if (fs.existsSync(orphanCheckFile)) {
      try {
        checkCounter = parseInt(fs.readFileSync(orphanCheckFile, 'utf8').trim(), 10) || 0;
      } catch (e) {
        // Use default
      }
    }

    checkCounter++;

    // Check every 20 prompts
    if (checkCounter >= 20) {
      const HooksManager = require('../cli/lib/hooks-manager');
      const pluginRoot = path.dirname(__dirname);
      const manager = new HooksManager(process.cwd());

      // Detect orphaned hooks
      const settings = manager.readSettings();
      const orphaned = manager.detectOrphanedHooks(settings, pluginRoot);

      if (orphaned.length > 0) {
        // Auto-cleanup orphaned hooks
        const cleaned = manager.removePluginHooks(settings, pluginRoot);
        manager.createBackup();
        manager.writeSettings(cleaned);

        // NOTE: We cannot inject context here as this is UserPromptSubmit hook
        // The cleanup happens silently in the background
      }

      checkCounter = 0; // Reset counter
    }

    // Write counter back
    fs.writeFileSync(orphanCheckFile, checkCounter.toString());
  } catch (orphanError) {
    // Silent failure - don't block hook execution
  }

  process.exit(0);

} catch (error) {
  // Outer catch: Handle plugin missing/uninstalled
  // Exit silently to avoid blocking Claude Code
  process.exit(0);
}