#!/opt/brepo/ruby33/bin/ruby
# info: utility to prepare existing server with hestiacp to use new alternative nginx
# options: COMMAND
#
# example: v-system-nginx-migrate migrate-nginx
#
# Commands:
# migratenginx - move old nginx configs to the new port and path
#
#

#------------------------------------------#
#                Variables & Functions                     #
#------------------------------------------#

# Argument definition
v_command = ARGV[0]

require "/usr/local/hestia/func_ruby/global_options"

load_ruby_options_defaults
$HESTIA = load_hestia_default_path_from_env

require "main"
require "modules"

require 'json' unless defined?(JSON)
require 'fileutils'
require 'time'
require 'pathname'


def copy_nginx_files(src_root, dest_root)
  FileUtils.mkdir_p(dest_root)
  Dir.foreach(src_root) do |entry|
    next if entry == '.' || entry == '..'
    next if entry == 'modules' || entry == 'modules-enabled'
    src_path = File.join(src_root, entry)
    dest_path = File.join(dest_root, entry)
    if File.directory?(src_path)
      FileUtils.mkdir_p(dest_path)
      copy_nginx_files(src_path, dest_path)
    else
      FileUtils.cp(src_path, dest_path)
    end
  end
end

# Function to log and execute migration stages
def log_migrate_stage(stage)
  log_file = '/usr/local/hestia/log/bunkerweb_migrate_stages.log'
  # Check if the stage has already been recorded
  if File.exist?(log_file) && File.readlines(log_file).any? { |line| line.strip == stage }
    hestia_print_error_message_to_cli "Stage #{stage} already completed, skipping."
    return
  end
  # Execute the stage block
  begin
    yield
    # Record the successful stage
    File.open(log_file, 'a') { |f| f.puts stage }
    hestia_print_info_message_to_cli "Stage #{stage} completed."
  rescue => e
    hestia_print_error_message_to_cli "Stage #{stage} failed: #{e.message}"
    exit 1
  end
end

# Function to parse and migrate nginx.conf from /usr/local/hestia/nginx-system/etc/nginx/nginx.conf
def migrate_nginx_config_from_file(source_path)
  return false unless File.exist?(source_path)

  hestia_print_info_message_to_cli "Processing nginx config from: #{source_path}"

  content = File.read(source_path)
  original_content = content.dup

  modified = false

  # Replace all paths starting with /var/ to /usr/local/hestia/nginx-system/var/
  # This pattern matches any absolute path that starts with /var/ anywhere in the line
  content = content.gsub(/\/var\//, '/usr/local/hestia/nginx-system/var/')

  # Replace pid path from /run/nginx.pid to /run/nginx-system.pid
  content = content.gsub(/pid\s+\S+/) { |match| match.gsub('/run/nginx.pid', '/run/nginx-system.pid') }

  if content != original_content
    File.write(source_path, content)
    hestia_print_info_message_to_cli "Updated config: #{source_path}"
    modified = true
  end

  modified
end

def parse_listen(line)
  # Попытка найти IP:port
  m = line.match(/^\s*listen\s+([^\s:]+):(\d+)/i)
  return [m[1], m[2]] if m
  # Если только порт после listen
  m = line.match(/^\s*listen\s+(\d+);?\s*$/i)
  return [nil, m[1]] if m
  nil
end

# Helper function to parse and replace ports in listen directives using temp placeholders
def parse_and_replace_listen_directive(line, proxy_port, proxy_ssl_port)
  return line unless line.match?(/\blisten\b/i)

  new_line = line.dup

  # Define target ports (always migrate to these values regardless of input)
  target_http_port = '8078'
  target_ssl_port = '8079'

  result = parse_listen(line)
  return line unless result
  ip, port = result

  if port == proxy_port
    if ip
      new_line.gsub!("#{ip}:#{port}", "#{ip}:#{target_http_port}")
    else
      new_line.gsub!(port, target_http_port)
    end
  elsif port == proxy_ssl_port
    if ip
      new_line.gsub!("#{ip}:#{port}", "#{ip}:#{target_ssl_port}")
    else
      new_line.gsub!(port, target_ssl_port)
    end
  end

  new_line
end

hestia_check_privileged_user

load_global_bash_variables "/etc/hestiacp/hestia.conf"
if $HESTIA.nil?
  hestia_print_error_message_to_cli "Can't find HESTIA base path"
  exit 1
end

load_global_bash_variables "#{$HESTIA}/conf/hestia.conf"

#------------------------------------------#
#                    Verifications                         #
#------------------------------------------#

check_args 1, ARGV, "COMMAND"

# Perform verification if read-only mode is enabled
check_hestia_demo_mode

#------------------------------------------#
#                       Action                             #
#------------------------------------------#

case v_command.to_sym
when :migratenginx
  log_migrate_stage('nstage0') do
    # Create backup of /etc/nginx with timestamp

    timestamp = Time.now.strftime('%Y%m%d_%H%M%S')
    backup_root = "/etc/nginx_backup_#{timestamp}"
    FileUtils.mkdir_p(backup_root)

    src_root = '/etc/nginx'
    dest_root = backup_root

    # Custom copy function to handle symlinks in conf.d/domains
    def copy_with_symlinks(src, dest)
      Dir.foreach(src) do |entry|
        next if entry == '.' || entry == '..'
        src_path = File.join(src, entry)
        dest_path = File.join(dest, entry)

        if File.symlink?(src_path)
          # Check if symlink is inside conf.d/domains
          if src_path.include?(File.join('conf.d', 'domains'))
            # Resolve the target of the symlink
            target_path = File.readlink(src_path)
            # Resolve relative symlink paths
            unless Pathname.new(target_path).absolute?
              target_path = File.expand_path(target_path, File.dirname(src_path))
            end
            if File.exist?(target_path) && File.file?(target_path)
              content = File.read(target_path)
              new_file_name = "#{entry}_content.conf"
              new_file_path = File.join(dest, new_file_name)
              File.write(new_file_path, content)
            end
          else
            # Preserve the symlink as is
            FileUtils.mkdir_p(File.dirname(dest_path))
            target = File.readlink(src_path)
            FileUtils.ln_s(target, dest_path)
          end
        elsif File.directory?(src_path)
          FileUtils.mkdir_p(dest_path)
          copy_with_symlinks(src_path, dest_path)
        else
          FileUtils.cp(src_path, dest_path)
        end
      end
    end

    copy_with_symlinks(src_root, dest_root)
  end
  log_migrate_stage('nstage2') do
    unless system('yum install -y nginx-system')
      hestia_print_error_message_to_cli "Failed to install nginx-system via yum"
      log_event E_ARGS, $ARGUMENTS
      exit 1
    end
  end
  log_migrate_stage('nstage3') do
    FileUtils.rm_f Dir.glob('/usr/local/hestia/nginx-system/etc/nginx/conf.d/*.conf')
    src_root = '/etc/nginx'
    dest_root = '/usr/local/hestia/nginx-system/etc/nginx'
    copy_nginx_files(src_root, dest_root)
  end
  log_migrate_stage('nstage4') do
    # Find all files under the nginx-system directory
    nginx_conf_dir = '/usr/local/hestia/nginx-system/etc/nginx'
    Dir.glob(File.join(nginx_conf_dir, '**', '*')).each do |path|
      hestia_print_info_message_to_cli "stage 4 processing file #{path}"
      next if File.directory?(path)
      content = File.read(path)
      new_content = content.gsub(/(?<!\/usr\/local\/hestia\/nginx-system)\/etc\/nginx/, '/usr/local/hestia/nginx-system/etc/nginx')
      if new_content != content
        hestia_print_info_message_to_cli "Changed path to config in file #{path}"
        File.open(path, 'w') { |f| f.write(new_content) }
      end
    end
  end
  log_migrate_stage('nstage4.1') do
    # Parse nginx.conf file to replace paths
    if migrate_nginx_config_from_file("/usr/local/hestia/nginx-system/etc/nginx/nginx.conf")
      hestia_print_info_message_to_cli "Completed migration of nginx.conf paths"
    else
      hestia_print_error_message_to_cli "Warning: Could not migrate nginx.conf from #{File.expand_path('/usr/local/hestia/nginx-system/etc/nginx/nginx.conf')}"
    end
  end
  log_migrate_stage('nstage7') do
    if system('/usr/local/hestia/bin/v-ext-modules enable update_module')
      output = IO.popen("/usr/local/hestia/bin/v-ext-modules state update_module json").read
      begin
        parsed = JSON.parse(output)
        if parsed.is_a?(Array) && parsed.first && parsed.first['STATE'] == 'enabled'
          system('/usr/local/hestia/bin/v-ext-modules-run update_module synctemplates')
        else
          hestia_print_error_message_to_cli "update_module not enabled after enable command"
          exit 1
        end
      rescue JSON::ParserError => e
        hestia_print_error_message_to_cli "Failed to parse JSON from state command: #{e.message}"
        exit 1
      end
    else
      hestia_print_error_message_to_cli "Failed to enable update_module"
      exit 1
    end
  end
  log_migrate_stage('stage9') do
    # Delete all contents inside /etc/nginx
    FileUtils.rm_rf Dir.glob('/etc/nginx/*')
    # Stop nginx service
    system('systemctl stop nginx')
    system('systemctl disable nginx')
    # Start nginx-system service
    system('systemctl enable nginx-system')
    system('systemctl start nginx-system')
  end
else
  hestia_print_error_message_to_cli "unknown command (use migratenginx)"
  log_event E_ARGS, $ARGUMENTS
  exit 1
end

exit 0