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package streaming.core.datasource.impl

import org.apache.spark.sql.{DataFrame, DataFrameReader, DataFrameWriter, Row}
import streaming.core.datasource._
import streaming.dsl.ScriptSQLExec
import streaming.dsl.mmlib.algs.param.{BaseParams, WowParams}

/**
  * 2019-03-20 WilliamZhu([email protected])
  */
class MLSQLText(override val uid: String) extends MLSQLBaseFileSource with WowParams {
  def this() = this(BaseParams.randomUID())

  override def load(reader: DataFrameReader, config: DataSourceConfig): DataFrame = {
    val context = ScriptSQLExec.contextGetOrForTest()
    val format = config.config.getOrElse("implClass", fullFormat)
    val owner = config.config.get("owner").getOrElse(context.owner)

    val paths = config.path.split(",").map { file =>
      resourceRealPath(context.execListener, Option(owner), file)
    }
    reader.options(rewriteConfig(config.config)).format(format).text(paths: _*)
  }

  override def save(writer: DataFrameWriter[Row], config: DataSinkConfig): Unit = {
    throw new RuntimeException("text not support save")
  }

  override def sourceInfo(config: DataAuthConfig): SourceInfo = {
    val context = ScriptSQLExec.contextGetOrForTest()
    val owner = config.config.get("owner").getOrElse(context.owner)

    val paths = config.path.split(",").map { file =>
      resourceRealPath(context.execListener, Option(owner), file)
    }
    SourceInfo(shortFormat, "", paths.mkString(","))
  }

  override def register(): Unit = {
    DataSourceRegistry.register(MLSQLDataSourceKey(fullFormat, MLSQLSparkDataSourceType), this)
    DataSourceRegistry.register(MLSQLDataSourceKey(shortFormat, MLSQLSparkDataSourceType), this)
  }

  override def fullFormat: String = "text"

  override def shortFormat: String = fullFormat
}