Align install generator with api_keys and usage_credits patterns

- Add post-install message with setup instructions
- Use same next_migration_number pattern as api_keys gem
- Clean up formatting to match conventions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: rameerez

lib/generators/footprinted/install_generator.rb

@@ -1,33 +1,53 @@
 # frozen_string_literal: true
 
-require 'rails/generators/base'
-require 'rails/generators/active_record'
+require "rails/generators/base"
+require "rails/generators/active_record"
 
 module Footprinted
   module Generators
     class InstallGenerator < Rails::Generators::Base
       include ActiveRecord::Generators::Migration
 
-      source_root File.expand_path('templates', __dir__)
+      source_root File.expand_path("templates", __dir__)
 
-      def self.next_migration_number(dir)
-        ActiveRecord::Generators::Base.next_migration_number(dir)
+      def self.next_migration_number(dirname)
+        next_migration_number = current_migration_number(dirname) + 1
+        ActiveRecord::Migration.next_migration_number(next_migration_number)
       end
 
       def create_migration_file
-        migration_template 'create_footprinted_footprints.rb.erb', File.join(db_migrate_path, "create_footprinted_footprints.rb")
+        migration_template "create_footprinted_footprints.rb.erb",
+                           File.join(db_migrate_path, "create_footprinted_footprints.rb")
       end
 
       def create_initializer
-        template 'footprinted.rb', 'config/initializers/footprinted.rb'
+        template "footprinted.rb", "config/initializers/footprinted.rb"
+      end
+
+      def display_post_install_message
+        say "\n🎉 The `footprinted` gem has been successfully installed!", :green
+        say "\nTo complete the setup:"
+        say "  1. Run `rails db:migrate` to create the footprints table."
+        say "     ⚠️  You must run migrations before starting your app!", :yellow
+        say "\n  2. Add `include Footprinted::Model` to any model you want to track:"
+        say "       class Product < ApplicationRecord"
+        say "         include Footprinted::Model"
+        say "       end"
+        say "\n  3. Create footprints from your controllers or services:"
+        say "       product.footprints.create!("
+        say "         ip: request.remote_ip,"
+        say "         event_type: 'page_view',"
+        say "         occurred_at: Time.current"
+        say "       )"
+        say "\nSee the footprinted README for detailed usage and examples.", :cyan
+        say "Happy tracking! 👣\n", :green
       end
 
       private
 
       def migration_version
         "[#{ActiveRecord::VERSION::STRING.to_f}]"
       end
-
     end
   end
 end