# frozen_string_literal: true

require 'date'

module Codat
  module Models
    class FinancialSheet < BaseModel
      # Default period length (months)
      DEFAULT_PERIOD_LENGTH = 12

      # Default number of periods to compare
      DEFAULT_PERIODS_TO_COMPARE = 2

      attr_reader :reports

      def self.inherited(other)
        super

        other.attributes :currency, :most_recent_available_month, :earliest_available_month
      end

      # Finds the latest financial sheet for a company. This can be a balance sheet or a profit and
      # loss document.
      #
      # Params are listed below:
      #  * company_id - the company ID from Codat
      #  * period_length - the number of months to get
      #  * periods_to_compare - how many periods (of period_length size) you want
      #  * start_month (optional) - starting in which month (date)
      #
      # An ArgumentError is raised unless you provide a :company_id key in the params.
      def self.find(params = {})
        company_id = params[:company_id]

        raise ArgumentError, 'please provide company_id' unless company_id

        url = format_url(@endpoint, company_id: company_id.to_s.strip)

        result = get(url, build_query(params))

        return nil unless successful_response?(result)

        new(json: result.body)
      end

      def self.build_query(params)
        options = params.dup

        query = {
          periodLength: options.fetch(:period_length, DEFAULT_PERIOD_LENGTH),
          periodsToCompare: options.fetch(:periods_to_compare, DEFAULT_PERIODS_TO_COMPARE)
        }

        options = options.transform_keys { |key| Camelizer.transform(key) }

        query.merge(options)
      end

      def self.report_class(report_class = nil)
        return @report_class unless report_class

        @report_class = report_class
      end

      def self.endpoint(endpoint = nil)
        return @endpoint unless endpoint

        @endpoint = endpoint
      end

      def initialize(json: {})
        super

        @most_recent_available_month = Date.parse(json[:mostRecentAvailableMonth])
        @earliest_available_month = Date.parse(json[:earliestAvailableMonth])

        reports_json = json.fetch(:reports, {})
        @reports = reports_json.map { |report| self.class.report_class.new(json: report) }
      end
    end
  end
end