CSV Imports Overhaul (Transactions, Trades, Accounts, and Mint import support) (#1209)

* Remove stale 1.0 import logic and model

* Fresh start

* Checkpoint before removing nav

* First working prototype

* Add trade, account, and mint import flows

* Basic working version with tests

* System tests for each import type

* Clean up mappings flow

* Clean up PR, refactor stale code, tests

* Add back row validations

* Row validations

* Fix import job test

* Fix import navigation

* Fix mint import configuration form

* Currency preset for new accounts

app/models/import/row.rb

@@ -0,0 +1,70 @@
+class Import::Row < ApplicationRecord
+  belongs_to :import
+
+  validates :amount, numericality: true, allow_blank: true
+  validates :currency, presence: true
+
+  validate :date_matches_user_format
+  validate :required_columns
+  validate :currency_is_valid
+
+  scope :ordered, -> { order(:id) }
+
+  def tags_list
+    if tags.blank?
+      [ "" ]
+    else
+      tags.split("|").map(&:strip)
+    end
+  end
+
+  def date_iso
+    Date.strptime(date, import.date_format).iso8601
+  end
+
+  def signed_amount
+    if import.type == "TradeImport"
+      price.to_d * apply_signage_convention(qty.to_d)
+    else
+      apply_signage_convention(amount.to_d)
+    end
+  end
+
+  def sync_mappings
+    Import::CategoryMapping.sync(import) if import.column_keys.include?(:category)
+    Import::TagMapping.sync(import) if import.column_keys.include?(:tags)
+    Import::AccountMapping.sync(import) if import.column_keys.include?(:account)
+    Import::AccountTypeMapping.sync(import) if import.column_keys.include?(:entity_type)
+  end
+
+  private
+    def apply_signage_convention(value)
+      value * (import.signage_convention == "inflows_positive" ? 1 : -1)
+    end
+
+    def required_columns
+      import.required_column_keys.each do |required_key|
+        errors.add(required_key, "is required") if self[required_key].blank?
+      end
+    end
+
+    def date_matches_user_format
+      return if date.blank?
+
+      parsed_date = Date.strptime(date, import.date_format) rescue nil
+
+      if parsed_date.nil?
+        errors.add(:date, "must exactly match the format: #{import.date_format}")
+      end
+    end
+
+    def currency_is_valid
+      return true if currency.blank?
+
+      begin
+        Money::Currency.new(currency)
+      rescue Money::Currency::UnknownCurrencyError
+        errors.add(:currency, "is not a valid currency code")
+      end
+    end
+end