package gw.rating.flow.domain

uses com.google.common.collect.ImmutableList

/**
 * A marker class so we can log the start of each iteration when worksheets are on.
 */
class LoopBodyCompoundStatement extends CompoundStatement {

  construct(loopStatement: LoopStatement, statements: ImmutableList<Statement>) {
    super(statements)
    Parent = loopStatement
  }

  property get LoopStatement(): LoopStatement {
    return Parent as LoopStatement
  }

  /**
   * Needed to override this because CompoundStatement does <b>not</b> wrap its statements. We cannot change
   * {@link CompoundStatement#generate(GenerationContext)} because that would break the display code.<br>
   *
   * This method causes the {@link gw.rating.worksheet.WorksheetLogger#iteration(String, String, String, String, String, int)}
   * logging when worksheets are on.
   *
   * @param context the generation context to which to write the code
   */
  override function generate(context: GenerationContext) {
    // To cause the worksheet iteration() logging to be generated even if loop body is empty.
    context.WorksheetHelper.wrapStatement(this, \ -> generateValue(context))
  }

  /**
   * Generates the content for the statements in the loop body.
   *
   * @param context
   */
  protected function generateValue(context: GenerationContext) {
    var lastStatementIndex = Statements.size() - 1
    Statements.eachWithIndex(\ statement, i -> {
      statement.generate(context)
      if (i < lastStatementIndex) {
        context.append('\n')
      }
    })
  }
}