# Licensed to Elasticsearch B.V. under one or more contributor
# license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright
# ownership. Elasticsearch B.V. licenses this file to you under
# the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#  http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

require "pluginmanager/command"
require "pluginmanager/errors"

class LogStash::PluginManager::PrepareOfflinePack < LogStash::PluginManager::Command
  parameter "[PLUGIN] ...", "plugin name(s)", :attribute_name => :plugins_arg
  option "--output", "OUTPUT", "output zip file", :default => ::File.join(LogStash::Environment::LOGSTASH_HOME, "logstash-offline-plugins-#{LOGSTASH_VERSION}.zip")
  option "--overwrite", :flag, "overwrite a previously generated package file", :default => false

  def execute
    validate_arguments!

    # We need to start bundler, dependencies so  the plugins are available for the prepare
    LogStash::Bundler.setup!({:without => [:build, :development]})

    # manually require paquet since its an external dependency
    require "pluginmanager/offline_plugin_packager"
    require "paquet"
    require "paquet/shell_ui"

    # Override the shell output with the one from the plugin manager
    # To silence some of debugs/info statements
    Paquet.ui = Paquet::SilentUI unless debug?

    if File.directory?(output)
      signal_error("Package creation cancelled: The specified output is a directory, you must specify a filename with a zip extension, provided output: #{output}.")
    else
      if File.extname(output).downcase != ".zip"
        signal_error("Package creation cancelled: You must specify the zip extension for the provided filename: #{output}.")
      end

      if ::File.exist?(output)
        if overwrite?
          File.delete(output)
        else
          signal_error("Package creation cancelled: output file destination #{output} already exists.")
        end
      end
    end

    LogStash::PluginManager::OfflinePluginPackager.package(plugins_arg, output)

    message = <<-EOS
Offline package created at: #{output}

You can install it with this command `bin/logstash-plugin install file://#{::File.expand_path(output)}`
    EOS

    LogStash::PluginManager::ui.info(message)
  rescue LogStash::PluginManager::UnpackablePluginError => e
    report_exception("Offline package", e)
  rescue LogStash::PluginManager::PluginNotFoundError => e
    report_exception("Cannot create the offline archive", e)
  end

  def validate_arguments!
    if plugins_arg.size == 0
      message = <<-EOS
You need to specify at least one plugin or use a wildcard expression.

Examples:
bin/logstash-plugin prepare-offline-pack logstash-input-beats
bin/logstash-plugin prepare-offline-pack logstash-filter-kv logstash-input-beats
bin/logstash-plugin prepare-offline-pack logstash-filter-*
bin/logstash-plugin prepare-offline-pack logstash-filter-* logstash-input-beats

You can get a list of the installed plugin by running `bin/logstash-plugin list`

The prepare offline will pack the currently installed plugins and their dependencies
for offline installation.
EOS
      signal_usage_error(message)
    end
  end
end