module Ardb; end
class Ardb::Adapter

  class Base

    attr_reader :config_settings, :database
    attr_reader :schema_format, :ruby_schema_path, :sql_schema_path

    def initialize
      @config_settings = Ardb.config.db_settings
      @database = Ardb.config.db.database
      @schema_format = Ardb.config.schema_format
      schema_path = Ardb.config.schema_path
      @ruby_schema_path = "#{schema_path}.rb"
      @sql_schema_path  = "#{schema_path}.sql"
    end

    def foreign_key_add_sql(*args);  raise NotImplementedError; end
    def foreign_key_drop_sql(*args); raise NotImplementedError; end

    def create_db(*args); raise NotImplementedError; end
    def drop_db(*args);   raise NotImplementedError; end

    def connect_db
      ActiveRecord::Base.connection
    end

    def migrate_db
      verbose = ENV["MIGRATE_QUIET"].nil?
      version = ENV["MIGRATE_VERSION"] ? ENV["MIGRATE_VERSION"].to_i : nil
      migrations_path = Ardb.config.migrations_path

      if defined?(ActiveRecord::Migration::CommandRecorder)
        require 'ardb/migration_helpers'
        ActiveRecord::Migration::CommandRecorder.class_eval do
          include Ardb::MigrationHelpers::RecorderMixin
        end
      end

      ActiveRecord::Migrator.migrations_path = migrations_path
      ActiveRecord::Migration.verbose = verbose
      ActiveRecord::Migrator.migrate(migrations_path, version) do |migration|
        ENV["MIGRATE_SCOPE"].blank? || (ENV["MIGRATE_SCOPE"] == migration.scope)
      end
    end

    def drop_tables(*args); raise NotImplementedError; end

    def load_schema
      # silence STDOUT
      current_stdout = $stdout.dup
      $stdout = File.new('/dev/null', 'w')
      load_ruby_schema if @schema_format == :ruby
      load_sql_schema  if @schema_format == :sql
      $stdout = current_stdout
    end

    def load_ruby_schema
      load @ruby_schema_path
    end

    def load_sql_schema
      raise NotImplementedError
    end

    def dump_schema
      # silence STDOUT
      current_stdout = $stdout.dup
      $stdout = File.new('/dev/null', 'w')
      dump_ruby_schema
      dump_sql_schema if @schema_format == :sql
      $stdout = current_stdout
    end

    def dump_ruby_schema
      require 'active_record/schema_dumper'
      FileUtils.mkdir_p File.dirname(@ruby_schema_path)
      File.open(@ruby_schema_path, 'w:utf-8') do |file|
        ActiveRecord::SchemaDumper.dump(ActiveRecord::Base.connection, file)
      end
    end

    def dump_sql_schema
      raise NotImplementedError
    end

    def ==(other_adapter)
      self.class == other_adapter.class
    end

  end

end