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/mint_import.rb

@@ -0,0 +1,94 @@
+class MintImport < Import
+  after_create :set_mappings
+
+  def generate_rows_from_csv
+    rows.destroy_all
+
+    mapped_rows = csv_rows.map do |row|
+      {
+        account: row[account_col_label].to_s,
+        date: row[date_col_label].to_s,
+        amount: signed_csv_amount(row).to_s,
+        currency: (row[currency_col_label] || default_currency).to_s,
+        name: (row[name_col_label] || default_row_name).to_s,
+        category: row[category_col_label].to_s,
+        tags: row[tags_col_label].to_s,
+        notes: row[notes_col_label].to_s
+      }
+    end
+
+    rows.insert_all!(mapped_rows)
+  end
+
+  def import!
+    transaction do
+      mappings.each(&:create_mappable!)
+
+      rows.each do |row|
+        account = mappings.accounts.mappable_for(row.account)
+        category = mappings.categories.mappable_for(row.category)
+        tags = row.tags_list.map { |tag| mappings.tags.mappable_for(tag) }.compact
+
+        entry = account.entries.build \
+          date: row.date_iso,
+          amount: row.signed_amount,
+          name: row.name,
+          currency: row.currency,
+          entryable: Account::Transaction.new(category: category, tags: tags, notes: row.notes),
+          import: self
+
+        entry.save!
+      end
+    end
+  end
+
+  def mapping_steps
+    [ Import::CategoryMapping, Import::TagMapping, Import::AccountMapping ]
+  end
+
+  def required_column_keys
+    %i[date amount]
+  end
+
+  def column_keys
+    %i[date amount name currency category tags account notes]
+  end
+
+  def csv_template
+    template = <<-CSV
+      Date,Amount,Account Name,Description,Category,Labels,Currency,Notes,Transaction Type
+      01/01/2024,-8.55,Checking,Starbucks,Food & Drink,Coffee|Breakfast,USD,Morning coffee,debit
+      04/15/2024,2000,Savings,Paycheck,Income,,USD,Bi-weekly salary,credit
+    CSV
+
+    CSV.parse(template, headers: true)
+  end
+
+  def signed_csv_amount(csv_row)
+    amount = csv_row[amount_col_label]
+    type = csv_row["Transaction Type"]
+
+    if type == "credit"
+      amount.to_d
+    else
+      amount.to_d * -1
+    end
+  end
+
+  private
+    def set_mappings
+      self.signage_convention = "inflows_positive"
+      self.date_col_label = "Date"
+      self.date_format = "%m/%d/%Y"
+      self.name_col_label = "Description"
+      self.amount_col_label = "Amount"
+      self.currency_col_label = "Currency"
+      self.account_col_label = "Account Name"
+      self.category_col_label = "Category"
+      self.tags_col_label = "Labels"
+      self.notes_col_label = "Notes"
+      self.entity_type_col_label = "Transaction Type"
+
+      save!
+    end
+end