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package org.checkerframework.dataflow.expression;

import java.util.Objects;
import javax.lang.model.type.TypeMirror;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.analysis.Store;
import org.checkerframework.javacutil.AnnotationProvider;

/** An array access. */
public class ArrayAccess extends JavaExpression {

  /** The array being accessed. */
  protected final JavaExpression array;

  /** The index; an expression of type int. */
  protected final JavaExpression index;

  /**
   * Create a new ArrayAccess.
   *
   * @param type the type of the array access
   * @param array the array being accessed
   * @param index the index; an expression of type int
   */
  public ArrayAccess(TypeMirror type, JavaExpression array, JavaExpression index) {
    super(type);
    this.array = array;
    this.index = index;
  }

  @SuppressWarnings("unchecked") // generic cast
  @Override
  public  @Nullable T containedOfClass(Class clazz) {
    if (getClass() == clazz) {
      return (T) this;
    }
    T result = array.containedOfClass(clazz);
    if (result != null) {
      return result;
    }
    return index.containedOfClass(clazz);
  }

  @Override
  public boolean isDeterministic(AnnotationProvider provider) {
    return array.isDeterministic(provider) && index.isDeterministic(provider);
  }

  /**
   * Returns the array being accessed.
   *
   * @return the array being accessed
   */
  public JavaExpression getArray() {
    return array;
  }

  public JavaExpression getIndex() {
    return index;
  }

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

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

  @Override
  public boolean syntacticEquals(JavaExpression je) {
    if (!(je instanceof ArrayAccess)) {
      return false;
    }
    ArrayAccess other = (ArrayAccess) je;
    return array.syntacticEquals(other.array) && index.syntacticEquals(other.index);
  }

  @Override
  public boolean containsSyntacticEqualJavaExpression(JavaExpression other) {
    return syntacticEquals(other)
        || array.containsSyntacticEqualJavaExpression(other)
        || index.containsSyntacticEqualJavaExpression(other);
  }

  @Override
  public boolean containsModifiableAliasOf(Store store, JavaExpression other) {
    if (array.containsModifiableAliasOf(store, other)) {
      return true;
    }
    return index.containsModifiableAliasOf(store, other);
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (!(obj instanceof ArrayAccess)) {
      return false;
    }
    ArrayAccess other = (ArrayAccess) obj;
    return array.equals(other.array) && index.equals(other.index);
  }

  @Override
  public int hashCode() {
    return Objects.hash(array, index);
  }

  @Override
  public String toString() {
    StringBuilder result = new StringBuilder();
    result.append(array.toString());
    result.append("[");
    result.append(index.toString());
    result.append("]");
    return result.toString();
  }

  @Override
  public  R accept(JavaExpressionVisitor visitor, P p) {
    return visitor.visitArrayAccess(this, p);
  }
}