#
# Copyright (c) 2014 Constant Contact
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#

module JenkinsPipelineBuilder
  class ModuleRegistry
    attr_accessor :registry, :registered_modules
    ENTRIES = {
      builders: '//builders',
      publishers: '//publishers',
      wrappers: '//buildWrappers',
      triggers: '//triggers'
    }

    # creates register_triggers and so on
    # we declare job attribues below since it doesn't follow the pattern
    ENTRIES.keys.each do |key|
      # TODO: Too lazy to figure out a better way to do this
      singular_key = key.to_s.singularize.to_sym
      define_method "register_#{singular_key}" do |name, jenkins_name, description, &block|
        @registered_modules[key][name] = {
          jenkins_name: jenkins_name,
          description: description
        }
        @registry[:job][key][:registry][name] = block
      end
    end

    def initialize
      @registry = { job: {} }
      @registered_modules = { job_attributes: {} }

      entries.each do |key, value|
        @registered_modules[key] = {}
        @registry[:job][key] = {}
        @registry[:job][key][:registry] = {}
        @registry[:job][key][:method] = ->(registry, params, n_xml) { run_registry_on_path(value, registry, params, n_xml) }
      end
    end

    def entries
      ENTRIES
    end

    def register_job_attribute(name, jenkins_name, description, &block)
      @registered_modules[:job_attributes][name] = {
        jenkins_name: jenkins_name,
        description: description
      }
      @registry[:job][name] = block
    end

    def get(path)
      parts = path.split('/')
      get_by_path_collection(parts, @registry)
    end

    def get_by_path_collection(path, registry)
      item = registry[path.shift.to_sym]
      return item if path.count == 0

      get_by_path_collection(path, item)
    end

    def traverse_registry_path(path, params, n_xml)
      registry = get(path)
      traverse_registry(registry, params, n_xml)
    end

    def traverse_registry(registry, params, n_xml)
      params.each do |key, value|
        execute_registry_item(registry, key, value, n_xml)
      end
    end

    def traverse_registry_param_array(registry, params, n_xml)
      params.each do |item|
        key = item.keys.first
        next if key.nil?
        execute_registry_item(registry, key, item[key], n_xml)
      end
    end

    def execute_registry_item(registry, key, value, n_xml)
      registry_item = registry[key]
      if registry_item.kind_of?(Hash)
        sub_registry = registry_item[:registry]
        method = registry_item[:method]
        method.call(sub_registry, value, n_xml)
      elsif registry_item.kind_of?(Method) || registry_item.kind_of?(Proc)
        registry_item.call(value, n_xml) unless registry_item.nil?
      end
    end

    def run_registry_on_path(path, registry, params, n_xml)
      n_builders = n_xml.xpath(path).first
      Nokogiri::XML::Builder.with(n_builders) do |xml|
        traverse_registry_param_array(registry, params, xml)
      end
    end
  end
end