#
# Author:: Adam Jacob (<adam@chef.io>)
# Author:: Nuo Yan (<nuo@chef.io>)
# Author:: Christopher Brown (<cb@chef.io>)
# Copyright:: Copyright (c) Chef Software Inc.
# License:: Apache License, Version 2.0
#
# 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_relative "config"
require_relative "mixin/params_validate"
require_relative "mixin/from_file"
require_relative "run_list"
require_relative "mash"
require_relative "json_compat"
require_relative "server_api"
require_relative "search/query"

class Chef
  class Role

    include Chef::Mixin::FromFile
    include Chef::Mixin::ParamsValidate

    # Create a new Chef::Role object.
    def initialize(chef_server_rest: nil)
      @name = ""
      @description = ""
      @default_attributes = Mash.new
      @override_attributes = Mash.new
      @env_run_lists = { "_default" => Chef::RunList.new }
      @chef_server_rest = chef_server_rest
    end

    def chef_server_rest
      @chef_server_rest ||= Chef::ServerAPI.new(Chef::Config[:chef_server_url])
    end

    def self.chef_server_rest
      Chef::ServerAPI.new(Chef::Config[:chef_server_url])
    end

    def name(arg = nil)
      set_or_return(
        :name,
        arg,
        regex: /^[\-[:alnum:]_]+$/
      )
    end

    def description(arg = nil)
      set_or_return(
        :description,
        arg,
        kind_of: String
      )
    end

    def run_list(*args)
      if args.length > 0
        @env_run_lists["_default"].reset!(args)
      end
      @env_run_lists["_default"]
    end

    alias_method :recipes, :run_list

    # For run_list expansion
    def run_list_for(environment)
      if env_run_lists[environment].nil?
        env_run_lists["_default"]
      else
        env_run_lists[environment]
      end
    end

    def active_run_list_for(environment)
      @env_run_lists.key?(environment) ? environment : "_default"
    end

    # Per environment run lists
    def env_run_lists(env_run_lists = nil)
      unless env_run_lists.nil?
        unless env_run_lists.key?("_default")
          msg = "_default key is required in env_run_lists.\n"
          msg << "(env_run_lists: #{env_run_lists.inspect})"
          raise Chef::Exceptions::InvalidEnvironmentRunListSpecification, msg
        end
        @env_run_lists.clear
        env_run_lists.each { |k, v| @env_run_lists[k] = Chef::RunList.new(*Array(v)) }
      end
      @env_run_lists
    end

    alias :env_run_list :env_run_lists

    def env_run_lists_add(env_run_lists = nil)
      unless env_run_lists.nil?
        env_run_lists.each { |k, v| @env_run_lists[k] = Chef::RunList.new(*Array(v)) }
      end
      @env_run_lists
    end

    alias :env_run_list_add :env_run_lists_add

    def default_attributes(arg = nil)
      set_or_return(
        :default_attributes,
        arg,
        kind_of: Hash
      )
    end

    def override_attributes(arg = nil)
      set_or_return(
        :override_attributes,
        arg,
        kind_of: Hash
      )
    end

    def to_h
      env_run_lists_without_default = @env_run_lists.dup
      env_run_lists_without_default.delete("_default")
      result = {
        "name" => @name,
        "description" => @description,
        "json_class" => self.class.name,
        "default_attributes" => @default_attributes,
        "override_attributes" => @override_attributes,
        "chef_type" => "role",

        # Render to_json correctly for run_list items (both run_list and evn_run_lists)
        # so malformed json does not result
        "run_list" => run_list.run_list.map(&:to_s),
        "env_run_lists" => env_run_lists_without_default.inject({}) do |accumulator, (k, v)|
          accumulator[k] = v.map(&:to_s)
          accumulator
        end,
      }
      result
    end

    alias_method :to_hash, :to_h

    # Serialize this object as a hash
    def to_json(*a)
      Chef::JSONCompat.to_json(to_h, *a)
    end

    def update_from!(o)
      description(o.description)
      recipes(o.recipes) if defined?(o.recipes)
      default_attributes(o.default_attributes)
      override_attributes(o.override_attributes)
      env_run_lists(o.env_run_lists) unless o.env_run_lists.nil?
      self
    end

    def self.from_hash(o)
      role = new
      role.name(o["name"])
      role.description(o["description"])
      role.default_attributes(o["default_attributes"])
      role.override_attributes(o["override_attributes"])

      # _default run_list is in 'run_list' for newer clients, and
      # 'recipes' for older clients.
      env_run_list_hash = { "_default" => (o.key?("run_list") ? o["run_list"] : o["recipes"]) }

      # Clients before 0.10 do not include env_run_lists, so only
      # merge if it's there.
      if o["env_run_lists"]
        env_run_list_hash.merge!(o["env_run_lists"])
      end
      role.env_run_lists(env_run_list_hash)

      role
    end

    # Get the list of all roles from the API.
    def self.list(inflate = false)
      if inflate
        response = {}
        Chef::Search::Query.new.search(:role) do |n|
          response[n.name] = n unless n.nil?
        end
        response
      else
        chef_server_rest.get("roles")
      end
    end

    # Load a role by name from the API
    def self.load(name)
      from_hash(chef_server_rest.get("roles/#{name}"))
    end

    def environment(env_name)
      chef_server_rest.get("roles/#{@name}/environments/#{env_name}")
    end

    def environments
      chef_server_rest.get("roles/#{@name}/environments")
    end

    # Remove this role via the REST API
    def destroy
      chef_server_rest.delete("roles/#{@name}")
    end

    # Save this role via the REST API
    def save
      begin
        chef_server_rest.put("roles/#{@name}", self)
      rescue Net::HTTPClientException => e
        raise e unless e.response.code == "404"

        chef_server_rest.post("roles", self)
      end
      self
    end

    # Create the role via the REST API
    def create
      chef_server_rest.post("roles", self)
      self
    end

    # As a string
    def to_s
      "role[#{@name}]"
    end

    # Load a role from disk - prefers to load the JSON, but will happily load
    # the raw rb files as well. Can search within directories in the role_path.
    def self.from_disk(name)
      paths = Array(Chef::Config[:role_path])
      paths.each do |path|
        roles_files = Dir.glob(File.join(Chef::Util::PathHelper.escape_glob_dir(path), "**", "**"))
        js_files = roles_files.select { |file| file.match(%r{/#{name}\.json$}) }
        rb_files = roles_files.select { |file| file.match(%r{/#{name}\.rb$}) }
        if js_files.count > 1 || rb_files.count > 1
          raise Chef::Exceptions::DuplicateRole, "Multiple roles of same type found named #{name}"
        end

        js_path, rb_path = js_files.first, rb_files.first

        if js_path && File.exist?(js_path)
          # from_json returns object.class => json_class in the JSON.
          hsh = Chef::JSONCompat.parse(IO.read(js_path))
          return from_hash(hsh)
        elsif rb_path && File.exist?(rb_path)
          role = Chef::Role.new
          role.name(name)
          role.from_file(rb_path)
          return role
        end
      end

      raise Chef::Exceptions::RoleNotFound, "Role '#{name}' could not be loaded from disk"
    end

  end
end