/*
 * Copyright © 2025-2026 Apple Inc. and the Pkl project authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.pkl.parser.syntax;

import java.util.List;
import java.util.Objects;
import org.jspecify.annotations.Nullable;
import org.pkl.parser.ParserVisitor;
import org.pkl.parser.Span;

public abstract sealed class StringPart extends AbstractNode {

  public StringPart(Span span, List<? extends @Nullable Node> children) {
    super(span, children);
  }

  @Override
  public <T> T accept(ParserVisitor<T> visitor) {
    return visitor.visitStringPart(this);
  }

  public static final class StringChars extends StringPart {
    private final String string;

    public StringChars(String string, Span span) {
      super(span, List.of());
      this.string = string;
    }

    public String getString() {
      return string;
    }

    @Override
    public String toString() {
      return "StringChars{string='" + string + '\'' + ", span=" + span + '}';
    }

    @Override
    public boolean equals(@Nullable Object o) {
      if (o == null || getClass() != o.getClass()) {
        return false;
      }
      if (this == o) {
        return true;
      }
      if (!super.equals(o)) {
        return false;
      }
      StringChars that = (StringChars) o;
      return Objects.equals(string, that.string);
    }

    @Override
    public int hashCode() {
      return Objects.hash(super.hashCode(), string);
    }
  }

  public static final class StringInterpolation extends StringPart {
    public StringInterpolation(Expr expr, Span span) {
      super(span, List.of(expr));
    }

    public Expr getExpr() {
      var ret = (Expr) children.get(0);
      assert ret != null;
      return ret;
    }
  }
}
