require 'json'
require 'admiral_stats_parser/model/tc_book_info'

class TcBookInfoParser
  MANDATORY_KEYS = {
    1 => {
      book_no: Integer,
      ship_class: String,
      ship_class_index: Integer,
      ship_type: String,
      ship_name: String,
      card_index_img: String,
      card_img_list: Array,
      variation_num: Integer,
      acquire_num: Integer,
#      lv: Integer,
#      status_img: Array,
    },
    2 => {
      book_no: Integer,
      ship_class: String,
      ship_class_index: Integer,
      ship_type: String,
      ship_name: String,
      card_index_img: String,
      card_img_list: Array,
      variation_num: Integer,
      acquire_num: Integer,
      lv: Integer,
      status_img: Array,
    },
    3 => {
        book_no: Integer,
        ship_class: String,
        ship_class_index: Integer,
        ship_type: String,
        ship_name: String,
        card_index_img: String,
        card_img_list: Array,
        variation_num: Integer,
        acquire_num: Integer,
        lv: Integer,
        status_img: Array,
    },
    4 => {
        book_no: Integer,
        ship_class: String,
        ship_type: String,
        ship_name: String,
        card_index_img: String,
        card_img_list: Array,
        variation_num: Integer,
        acquire_num: Integer,
        lv: Integer,
        status_img: Array,
    },
  }

  OPTIONAL_KEYS = {
      1 => {},
      2 => {},
      3 => {
          is_married: Array,
          married_img: Array,
      },
      4 => {
          ship_class_index: Integer,
          is_married: Array,
          married_img: Array,
      },
  }

  def self.parse(json, api_version)
    items_array = JSON.parse(json)

    unless items_array.is_a?(Array)
      raise 'json is not an Array'
    end

    results = []
    items_array.each do |items|
      result = TcBookInfo.new

      MANDATORY_KEYS[api_version].each do |key, key_class|
        # 必須のキーが含まれなければエラー
        camel_case_key = key.to_s.split('_').inject([]){ |buffer,e| buffer.push(buffer.empty? ? e : e.capitalize) }.join
        unless items.include?(camel_case_key)
          raise "Mandatory key #{key} does not exist"
        end

        # 結果のクラスが合わなければエラー
        unless items[camel_case_key].is_a?(key_class)
          raise "Mandatory key #{key} is not class #{key_class}"
        end

        result.instance_variable_set("@#{key.to_s}", items[camel_case_key])
      end

      OPTIONAL_KEYS[api_version].each do |key, key_class|
        # キーが含まれなければ、処理をスキップ
        camel_case_key = key.to_s.split('_').inject([]){ |buffer,e| buffer.push(buffer.empty? ? e : e.capitalize) }.join
        next unless items.include?(camel_case_key)

        # 結果のクラスが合わなければエラー
        unless items[camel_case_key].is_a?(key_class)
          raise "Optional key #{key} is not class #{key_class}"
        end

        result.instance_variable_set("@#{key.to_s}", items[camel_case_key])
      end

      results << result
    end

    results
  end
end