package bluej.stride.framedjava.errors;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import bluej.compiler.Diagnostic.DiagnosticOrigin;
import bluej.stride.framedjava.ast.StringSlotFragment;
import bluej.stride.framedjava.errors.Correction.SimpleCorrectionInfo;
import bluej.stride.framedjava.slots.ExpressionSlot;
import threadchecker.OnThread;
import threadchecker.Tag;

public class UndeclaredVariableInExpressionError
extends DirectSlotError{    
   private final String varName;
   
   private final int startPosInSlot;
   
   private final int endPosInSlot;
   
   private List<FixSuggestion> corrections = new ArrayList<>();

   
   


| Creates an error about an undeclared variable being used in an expression. The quick fixes
| will be to switch the variable name to another similarly spelt variable.
|
| @param slotFragment The fragment with the error.
| @param varName The name of the variable which is used, but not declared
| @param startPosInSlot The start position in the slot of the variable name (inclusive)
| @param endPosInSlot The end position in the slot of the variable name (exclusive)
| @param slot The slot with the error (which will contain slotFragment).
| @param possibleCorrections The possible other variable names (unfiltered: all variable names which are in scope)
|
@OnThread(Tag.FXPlatform)
   
   public UndeclaredVariableInExpressionError(StringSlotFragment slotFragment, String varName, int startPosInSlot, int endPosInSlot, ExpressionSlot slot, Set<String> possibleCorrections)
   {
      super(slotFragment, DiagnosticOrigin.STRIDE_LATE);
       
      this.varName = varName;
       
      this.startPosInSlot = startPosInSlot;
       
      this.endPosInSlot = endPosInSlot;

      corrections.addAll(Correction.winnowAndCreateCorrections(varName, possibleCorrections.stream().map(SimpleCorrectionInfo::new), s -> slot.replace(startPosInSlot, endPosInSlot, isJavaPos(), s)));     
      }

   
   @Override
   
   public int getStartPosition()
   {        
      return startPosInSlot;     
      }

   
   @Override
   
   public int getEndPosition()
   {        
      return endPosInSlot;     
      }    

   
   @Override
   @OnThread(Tag.Any)
   
   public String getMessage()
   {        
      return "Undeclared variable: " + varName;     
      }

   
   @Override
   
   public List getFixSuggestions()
   {        
      return corrections;     
      }

   
   @Override
   
   public boolean isJavaPos()
   {        
      return true;     
      } 
   }