#!/usr/bin/env node
/**
 * Claude Flow Cross-Platform Session Manager
 * Works on Windows, macOS, and Linux
 */

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

const platform = os.platform();
const homeDir = os.homedir();

function getDataDir() {
  const localDir = path.join(process.cwd(), '.claude-flow', 'sessions');
  if (fs.existsSync(path.dirname(localDir))) {
    return localDir;
  }

  switch (platform) {
    case 'win32':
      return path.join(process.env.APPDATA || homeDir, 'claude-flow', 'sessions');
    case 'darwin':
      return path.join(homeDir, 'Library', 'Application Support', 'claude-flow', 'sessions');
    default:
      return path.join(homeDir, '.claude-flow', 'sessions');
  }
}

const SESSION_DIR = getDataDir();
const SESSION_FILE = path.join(SESSION_DIR, 'current.json');

function ensureDir(dir) {
  if (!fs.existsSync(dir)) {
    fs.mkdirSync(dir, { recursive: true });
  }
}

const commands = {
  start: () => {
    ensureDir(SESSION_DIR);
    const sessionId = `session-${Date.now()}`;
    const session = {
      id: sessionId,
      startedAt: new Date().toISOString(),
      platform: platform,
      cwd: process.cwd(),
      context: {},
      metrics: { edits: 0, commands: 0, tasks: 0, errors: 0 }
    };
    fs.writeFileSync(SESSION_FILE, JSON.stringify(session, null, 2));
    console.log(`Session started: ${sessionId}`);
    return session;
  },

  restore: () => {
    if (!fs.existsSync(SESSION_FILE)) {
      console.log('No session to restore');
      return null;
    }
    const session = JSON.parse(fs.readFileSync(SESSION_FILE, 'utf-8'));
    session.restoredAt = new Date().toISOString();
    fs.writeFileSync(SESSION_FILE, JSON.stringify(session, null, 2));
    console.log(`Session restored: ${session.id}`);
    return session;
  },

  end: () => {
    if (!fs.existsSync(SESSION_FILE)) {
      console.log('No active session');
      return null;
    }
    const session = JSON.parse(fs.readFileSync(SESSION_FILE, 'utf-8'));
    session.endedAt = new Date().toISOString();
    session.duration = Date.now() - new Date(session.startedAt).getTime();

    const archivePath = path.join(SESSION_DIR, `${session.id}.json`);
    fs.writeFileSync(archivePath, JSON.stringify(session, null, 2));
    fs.unlinkSync(SESSION_FILE);

    console.log(`Session ended: ${session.id}`);
    console.log(`Duration: ${Math.round(session.duration / 1000 / 60)} minutes`);
    return session;
  },

  status: () => {
    if (!fs.existsSync(SESSION_FILE)) {
      console.log('No active session');
      return null;
    }
    const session = JSON.parse(fs.readFileSync(SESSION_FILE, 'utf-8'));
    const duration = Date.now() - new Date(session.startedAt).getTime();
    console.log(`Session: ${session.id}`);
    console.log(`Platform: ${session.platform}`);
    console.log(`Started: ${session.startedAt}`);
    console.log(`Duration: ${Math.round(duration / 1000 / 60)} minutes`);
    return session;
  },

  metric: (name) => {
    if (!fs.existsSync(SESSION_FILE)) {
      return null;
    }
    const session = JSON.parse(fs.readFileSync(SESSION_FILE, 'utf-8'));
    if (session.metrics[name] !== undefined) {
      session.metrics[name]++;
      fs.writeFileSync(SESSION_FILE, JSON.stringify(session, null, 2));
    }
    return session;
  }
};

module.exports = commands;

// CLI - only run when executed directly
if (require.main === module) {
  const [,, command, ...args] = process.argv;
  if (command && commands[command]) {
    commands[command](...args);
  } else {
    console.log('Usage: session.js <start|restore|end|status|metric>');
    console.log(`Platform: ${platform}`);
    console.log(`Data dir: ${SESSION_DIR}`);
  }
}