# coding: utf-8
#
# Copyright (c) 2014 TechnoPark Corp.
# Copyright (c) 2014 Yegor Bugayenko
#
# 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 NONINFINGEMENT. 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.

require 'pdd/sources'
require 'nokogiri'
require 'logger'

# PDD main module.
# Author:: Yegor Bugayenko (yegor@teamed.io)
# Copyright:: Copyright (c) 2014 Yegor Bugayenko
# License:: MIT
module PDD
  # If it breaks.
  class Error < StandardError
  end

  # If it violates XSD schema.
  class SchemaError < Error
  end

  # Get logger.
  def self.log
    @log ||= Logger.new(STDOUT)
  end

  class << self
    attr_writer :log
  end

  # Code base abstraction
  class Base
    # Ctor.
    # +opts+:: Options
    def initialize(opts)
      @opts = opts
      PDD.log = Logger.new(File::NULL) unless @opts.verbose?
    end

    # Generate XML.
    def xml
      dir = @opts.source? ? @opts[:source] : Dir.pwd
      PDD.log.info "reading #{dir}"
      sanitize(
        Nokogiri::XML::Builder.new do |xml|
          xml << '<?xml-stylesheet type="text/xsl" href="puzzles.xsl"?>'
          xml.puzzles do
            Sources.new(dir).fetch.each do |source|
              source.puzzles.each do |puzzle|
                PDD.log.info "puzzle #{puzzle.props[:ticket]}:" \
                  "#{puzzle.props[:estimate]}/#{puzzle.props[:role]}" \
                  " at #{puzzle.props[:file]}"
                render puzzle, xml
              end
            end
          end
        end.to_xml
      )
    end

    private

    def render(puzzle, xml)
      props = puzzle.props
      xml.puzzle do
        props.map do |k, v|
          xml.send(:"#{k}", v)
        end
      end
    end

    def sanitize(xml)
      xsd = Nokogiri::XML::Schema(
        File.read(File.join(File.dirname(__FILE__), '../asserts/puzzles.xsd'))
      )
      errors = xsd.validate(Nokogiri::XML(xml)).map { |error| error.message }
      errors.each { |e| PDD.log.error e }
      fail SchemaError, errors.join('; ') unless errors.empty?
      xml
    end
  end
end