#!/bin/bash

# Generate ecosystem.config.js from package.json
# Usage: ./generate-ecosystem-config.sh <user> <app_path>

user=$1
app_path=$2

if [ -z "$user" ] || [ -z "$app_path" ]; then
  echo "Usage: $0 <user> <app_path>"
  exit 1
fi

package_json="$app_path/package.json"
ecosystem_config="$app_path/ecosystem.config.js"

# Check if package.json exists
if [ ! -f "$package_json" ]; then
  echo "Error: package.json not found at $package_json"
  exit 1
fi

# Extract values from package.json
app_name=$(node -p "try { require('$package_json').name || 'node-app' } catch(e) { 'node-app' }")
main_script=$(node -p "try { require('$package_json').main || 'index.js' } catch(e) { 'index.js' }")
start_script=$(node -p "try { const scripts = require('$package_json').scripts; if (scripts && scripts.start) { scripts.start.replace(/^node\s+/, '') } else { null } } catch(e) { null }")

# Use start script if available, otherwise use main field
if [ "$start_script" != "null" ] && [ -n "$start_script" ]; then
  script_file="$start_script"
else
  script_file="$main_script"
fi

# Clean up the script file name (remove any node command prefix)
script_file=$(echo "$script_file" | sed 's/^node\s\+//')

# Generate ecosystem.config.js
cat > "$ecosystem_config" << EOF
module.exports = {
  apps: [{
    name: '${app_name}',
    script: '${script_file}',
    instances: 1,
    autorestart: true,
    watch: false,
    max_memory_restart: '256M',
    kill_timeout: 3000,
    wait_ready: true,
    listen_timeout: 3000,
    env: {
      NODE_ENV: 'development',
      PORT: 3000,
      NODE_OPTIONS: '--max-old-space-size=200'
    },
    env_production: {
      NODE_ENV: 'production',
      PORT: 3000,
      NODE_OPTIONS: '--max-old-space-size=200'
    },
    log_file: '/home/${user}/logs/nodejs/app.log',
    error_file: '/home/${user}/logs/nodejs/error.log',
    out_file: '/home/${user}/logs/nodejs/out.log',
    log_date_format: 'YYYY-MM-DD HH:mm:ss Z',
    log_type: 'json',
    merge_logs: true,
    max_restarts: 5,
    min_uptime: '10s'
  }]
};
EOF

echo "Generated ecosystem.config.js for app: $app_name (script: $script_file)"