require 'yaml'
require 'erb'
require 'fileutils'

require 'spout/helpers/subject_loader'
require 'spout/models/coverage_result'
require 'spout/helpers/number_helper'
require 'spout/helpers/config_reader'

module Spout
  module Commands
    class Coverage
      include Spout::Helpers::NumberHelper

      def initialize(standard_version, argv)
        @standard_version = standard_version
        @console = (argv.delete('--console') != nil)

        @variable_files = Dir.glob("variables/**/*.json")
        @valid_ids = []
        @number_of_rows = nil

        @config = Spout::Helpers::ConfigReader.new

        @subject_loader = Spout::Helpers::SubjectLoader.new(@variable_files, @valid_ids, @standard_version, @number_of_rows, @config.visit)
        @subject_loader.load_subjects_from_csvs_part_one! # Not Part Two which is essentially cleaning the data
        @subjects = @subject_loader.subjects

        run_coverage_report!
      end

      def run_coverage_report!
        puts "Generating: index.html\n\n"

        @matching_results = []

        @subject_loader.all_methods.each do |method, csv_files|
          scr = Spout::Models::CoverageResult.new(method, @subjects.collect(&method.to_sym).uniq)
          @matching_results << [ csv_files, method, scr ]
        end

        variable_ids = Dir.glob("variables/**/*.json").collect{ |file| file.gsub(/^(.*)\/|\.json$/, '').downcase }
        @extra_variable_ids = (variable_ids - @subject_loader.all_methods.keys).sort

        @subject_loader.load_variable_domains!
        domain_ids = Dir.glob("domains/**/*.json").collect{ |file| file.gsub(/^(.*)\/|\.json$/, '').downcase }
        @extra_domain_ids = (domain_ids - @subject_loader.all_domains).sort

        @matching_results.sort!{|a,b| [b[2].number_of_errors, a[0].to_s, a[1].to_s] <=> [a[2].number_of_errors, b[0].to_s, b[1].to_s]}

        @coverage_results = []

        @subject_loader.csv_files.each do |csv_file|
          total_column_count = @matching_results.select{|mr| mr[0].include?(csv_file)}.count
          mapped_column_count = @matching_results.select{|mr| mr[0].include?(csv_file) and mr[2].number_of_errors == 0}.count
          @coverage_results << [ csv_file, total_column_count, mapped_column_count ]
        end

        coverage_folder = File.join(Dir.pwd, 'coverage')
        FileUtils.mkpath coverage_folder
        coverage_file = File.join(coverage_folder, 'index.html')

        File.open(coverage_file, 'w+') do |file|
          erb_location = File.join( File.dirname(__FILE__), '../views/index.html.erb' )
          file.puts ERB.new(File.read(erb_location)).result(binding)
        end

        unless @console
          open_command = 'open'  if RUBY_PLATFORM.match(/darwin/) != nil
          open_command = 'start' if RUBY_PLATFORM.match(/mingw/) != nil

          system "#{open_command} #{coverage_file}" if ['start', 'open'].include?(open_command)
        end
        puts "#{coverage_file}\n\n"
      end
    end
  end
end