require "yaml"
require "json"
require "json_schema"
require "active_support"
require "active_support/core_ext"

module Hasmenu
  class Validator
    include Printer

    def initialize(type, options)
      @type = type.chomp("/")
      @schemad = options[:schema] || File.join(Dir.pwd, ".meta", "schema")
    end

    def load_schema
      file = File.join(@schemad, "#{@type}-v4.json")

      if File.file? file
        schema_data = JSON.parse File.read(file)
        @schema, error = JsonSchema.parse(schema_data)
        if error
          puts error
          return false
        end
        return true
      else
        print_invalid_path
        return false
      end
    end

    def validate_uniqueness(data)
      schema_data = JSON.parse '{"type": "array", "items": {"type": "string"}, "uniqueItems": true}'
      schema = JsonSchema.parse!(schema_data)

      validated, errors = schema.validate(data)
      unless validated
        puts errors
        duplicates = data.group_by { |e| e }.select { |k, v| v.size > 1 }.map(&:first)
        puts JSON.dump duplicates
      end
    end

    def validate(path)
      print_header path

      data = YAML.load_file(path)

      # check valid schema
      validated, errors = @schema.validate(data)
      puts errors unless validated

      # check unique columns
      type, subtype = @type.split("/")
      case type
        when "chains", "restaurants"
          validate_uniqueness(data.map { |x| x["uid"] })
        when "menu"
          case subtype
            when "chain"
              menus = data["chain"]["menus"] if data["chain"]
            when "restaurant"
              menus = data["restaurant"]["menus"] if data["restaurant"]
          end
      end

      if menus
        validate_uniqueness(menus.map { |m| m["uid"] })
        menus.each do |menu|
          sections = menu["sections"]
          validate_uniqueness(sections.map { |s| s["uid"] })

          items = sections.map { |s| s["items"].reject { |i| i["repeat"] } }.flatten
          validate_uniqueness(items.map { |i| i["uid"] })
          validate_uniqueness(items.map { |i| i["name"] })

          print_warn_repeats \
            if sections.map { |s| s["items"].select { |i| i["repeat"] } }.flatten.present?
        end
      end

      # check file naming conventions
      if menus
        menu = menus.first
        filename = File.basename(path, ".yml")
        # sequence
        if menu && menu.key?("active") && !menu["active"]
          print_invalid_sequence unless filename[0..2] == "xa-"
        else
          print_invalid_sequence unless filename[0..2] =~ /[0-9][0-9]-/
        end
        # version
        print_invalid_version unless filename[3..-1] == "#{menu['uid']}-v#{menu['version']}"
      end
    end

    def validate_all(path)
      Dir.glob(path + "/**/*.yml") do |file|
        validate file
      end
    end

    def perform(path)
      unless File.exist? path
        print_invalid_path
        return
      end

      return unless load_schema

      if File.file? path
        validate path
      elsif File.directory? path
        validate_all path
      else
        print_invalid_path
      end
    end
  end
end