#
# Copyright 2014 Chef Software, Inc.
#
# Licensed 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 "thor"
require "omnibus"
require "ffi_yajl"

module Omnibus
  class CLI < Command::Base
    # This is the main entry point for the CLI. It exposes the method
    # {#execute!} to start the CLI.
    #
    # @note the arity of {#initialize} and {#execute!} are extremely important
    # for testing purposes. It is a requirement to perform in-process testing
    # with Aruba. In process testing is much faster than spawning a new Ruby
    # process for each test.
    class Runner
      include Logging

      def initialize(argv, stdin = STDIN, stdout = STDOUT, stderr = STDERR, kernel = Kernel)
        @argv, @stdin, @stdout, @stderr, @kernel = argv, stdin, stdout, stderr, kernel
      end

      def execute!
        $stdin  = @stdin
        $stdout = @stdout
        $stderr = @stderr

        Omnibus::CLI.start(@argv)
        @kernel.exit(0)
      rescue Omnibus::Error => e
        error = Omnibus.ui.set_color(e.message, :red)
        backtrace = Omnibus.ui.set_color("\n" + e.backtrace.join("\n  "), :red)
        Omnibus.ui.error(error)
        Omnibus.ui.error(backtrace)

        if e.respond_to?(:status_code)
          @kernel.exit(e.status_code)
        else
          @kernel.exit(1)
        end
      end
    end

    map %w{-v --version} => "version"

    #
    # Build an Omnibus project or software definition.
    #
    #   $ omnibus build chefdk
    #
    method_option :output_manifest,
      desc: "Create version-manifest.json in current directory at the end of the build",
      type: :boolean,
      default: true
    method_option :use_manifest,
      desc: "Use the given manifest when downloading software sources.",
      type: :string,
      default: nil
    method_option :populate_s3_cache,
      desc: "Populate the S3 cache.",
      type: :boolean,
      default: false
    desc "build PROJECT", "Build the given Omnibus project"
    def build(name)
      manifest = if @options[:use_manifest]
                   Omnibus::Manifest.from_file(@options[:use_manifest])
                 else
                   nil
                 end

      project = Project.load(name, manifest)
      say("Building #{project.name} #{project.build_version}...")
      Omnibus::S3Cache.populate if @options[:populate_s3_cache] && !Omnibus::S3Cache.fetch_missing.empty?
      project.download
      project.build

      if @options[:output_manifest]
        FileUtils.mkdir_p("pkg")
        File.open(::File.join("pkg", "version-manifest.json"), "w") do |f|
          f.write(FFI_Yajl::Encoder.encode(project.built_manifest.to_hash))
        end
      end
    end

    register(Command::ChangeLog, "changelog", "changelog [COMMAND]", "Create and view changelogs")
    CLI.tasks["changelog"].options = Command::ChangeLog.class_options

    #
    # Generate a version manifest for the given project definition
    #
    #   $ omnibus manifest PROJECT
    #
    method_option :os,
      desc: "An os name in Ohai form. Defaults to the current os.",
      type: :string
    method_option :platform_family,
      desc: "A platform family string in Ohai form. Defaults to the current platform_family.",
      type: :string
    method_option :platform,
      desc: "A platform string in Ohai form. Defaults to the current platform.",
      type: :string
    method_option :platform_version,
      desc: "A platform version string in Ohai form. Defaults to the current platform.",
      type: :string
    method_option :architecture,
      desc: "The target architecture: x86, x64, powerpc. Defaults to the current architecture."
    desc "manifest PROJECT", "Print a manifest for the given Omnibus project"
    def manifest(name)
      # Override ohai information
      Ohai["os"] = @options[:os] if @options[:os]
      Ohai["platform_family"] = @options[:platform_family] if @options[:platform_family]
      Ohai["platform"] = @options[:platform] if @options[:platform]
      Ohai["platform_version"] = @options[:platform_version] if @options[:platform_version]
      Ohai["kernel"]["machine"] = @options[:architecture] if @options[:architecture]
      puts FFI_Yajl::Encoder.encode(Project.load(name).built_manifest.to_hash, pretty: true)
    end

    #
    # Perform cache management functions.
    #
    #   $ omnibus cache list
    #
    register(Command::Cache, "cache", "cache [COMMAND]", "Manage the cache")
    CLI.tasks["cache"].options = Command::Cache.class_options

    #
    # Clean the Omnibus project.
    #
    #   $ omnibus clean chefdk
    #
    register(Cleaner, "clean", "clean PROJECT", "Clean the Omnibus project")
    CLI.tasks["clean"].options = Cleaner.class_options

    #
    # Initialize a new Omnibus project.
    #
    #   $ omnibus new NAME
    #
    register(Generator, "new", "new NAME", "Initialize a new Omnibus project")
    CLI.tasks["new"].options = Generator.class_options

    #
    # List the Omnibus projects available from "here".
    #
    #   $ omnibus list
    #
    desc "list", "List the Omnibus projects"
    def list
      if Omnibus.projects.empty?
        say("There are no Omnibus projects!")
      else
        say("Omnibus projects:")
        Omnibus.projects.sort.each do |project|
          say("  * #{project.name} (#{project.build_version})")
        end
      end
    end

    #
    # Publish Omnibus package(s) to a backend.
    #
    #   $ omnibus publish s3 pkg/*chef*
    #
    register(Command::Publish, "publish", "publish [COMMAND]", "Publish Omnibus packages to a backend")
    CLI.tasks["publish"].options = Command::Publish.class_options

    #
    # Display version information.
    #
    #   $ omnibus version
    #
    desc "version", "Display version information", hide: true
    def version
      say("Omnibus v#{Omnibus::VERSION}")
    end
  end
end