class Multiwoven::Integrations::Destination::MariaDB::Client

def check_connection(connection_config)
  connection_config = connection_config.with_indifferent_access
  create_connection(connection_config)
  ConnectionStatus.new(status: ConnectionStatusType["succeeded"]).to_multiwoven_message
rescue StandardError => e
  ConnectionStatus.new(status: ConnectionStatusType["failed"], message: e.message).to_multiwoven_message
end

def create_connection(connection_config)
  Sequel.connect(
    adapter: "mysql2",
    host: connection_config[:host],
    port: connection_config[:port],
    user: connection_config[:username],
    password: connection_config[:password],
    database: connection_config[:database]
  )
end

def create_streams(records)
  group_by_table(records).map do |_, r|
    Multiwoven::Integrations::Protocol::Stream.new(name: r[:tablename], action: StreamAction["fetch"], json_schema: convert_to_json_schema(r[:columns]))
  end
end

def discover(connection_config)
  connection_config = connection_config.with_indifferent_access
  query = "SELECT table_name, column_name, data_type, is_nullable
           FROM information_schema.columns
           WHERE table_schema = '#{connection_config[:database]}'
           ORDER BY table_name, ordinal_position;"
  db = create_connection(connection_config)
  records = db.fetch(query) do |result|
    result.map do |row|
      row
    end
  end
  catalog = Catalog.new(streams: create_streams(records))
  catalog.to_multiwoven_message
rescue StandardError => e
  handle_exception(
    "MARIA:DB:DISCOVER:EXCEPTION",
    "error",
    e
  )
end

def group_by_table(records)
  result = {}
  records.each_with_index do |entry, index|
    table_name = entry[:table_name]
    column_data = {
      column_name: entry[:column_name],
      data_type: entry[:data_type],
      is_nullable: entry[:is_nullable] == "YES"
    }
    result[index] ||= {}
    result[index][:tablename] = table_name
    result[index][:columns] = [column_data]
  end
  result.values.group_by { |entry| entry[:tablename] }.transform_values do |entries|
    { tablename: entries.first[:tablename], columns: entries.flat_map { |entry| entry[:columns] } }
  end
end

def write(sync_config, records, action = "destination_insert")
  connection_config = sync_config.destination.connection_specification.with_indifferent_access
  table_name = sync_config.stream.name
  primary_key = sync_config.model.primary_key
  db = create_connection(connection_config)
  log_message_array = []
  write_success = 0
  write_failure = 0
  records.each do |record|
    query = Multiwoven::Integrations::Core::QueryBuilder.perform(action, table_name, record, primary_key)
    logger.debug("MARIA:DB:WRITE:QUERY query = #{query} sync_id = #{sync_config.sync_id} sync_run_id = #{sync_config.sync_run_id}")
    begin
      db.run(query)
      write_success += 1
      log_message_array << log_request_response("info", query, "Successful")
    rescue StandardError => e
      handle_exception(e, {
                         context: "MARIA:DB:RECORD:WRITE:EXCEPTION",
                         type: "error",
                         sync_id: sync_config.sync_id,
                         sync_run_id: sync_config.sync_run_id
                       })
      write_failure += 1
      log_message_array << log_request_response("error", query, e.message)
    end
  end
  tracking_message(write_success, write_failure, log_message_array)
rescue StandardError => e
  handle_exception(e, {
                     context: "MARIA:DB:RECORD:WRITE:EXCEPTION",
                     type: "error",
                     sync_id: sync_config.sync_id,
                     sync_run_id: sync_config.sync_run_id
                   })
end