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/*
 * Copyright 2021 the original author or authors.
 * 
 * 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.openrewrite.json;

import lombok.EqualsAndHashCode;
import lombok.Value;
import org.openrewrite.*;
import org.openrewrite.json.tree.Json;

@Value
@EqualsAndHashCode(callSuper = false)
public class ChangeKey extends Recipe {
    @Option(displayName = "Old key path",
            description = "A [JsonPath](https://docs.openrewrite.org/reference/jsonpath-and-jsonpathmatcher-reference) expression to locate a JSON entry.",
            example = "$.subjects.kind")
    String oldKeyPath;

    @Option(displayName = "New key",
            description = "The new name for the key selected by oldKeyPath.",
            example = "kind")
    String newKey;

    @Override
    public String getDisplayName() {
        return "Change key";
    }

    @Override
    public String getInstanceNameSuffix() {
        return String.format("`%s` to `%s`", oldKeyPath, newKey);
    }

    @Override
    public String getDescription() {
        return "Change a JSON mapping entry key, while leaving the value intact.";
    }

    @Override
    public TreeVisitor getVisitor() {
        JsonPathMatcher matcher = new JsonPathMatcher(oldKeyPath);
        return new JsonIsoVisitor() {
            @Override
            public Json.Member visitMember(Json.Member member, ExecutionContext ctx) {
                Json.Member m = super.visitMember(member, ctx);
                if (matcher.matches(getCursor())) {
                    String value = ChangeKey.this.newKey;
                    if (value.startsWith("'") || value.startsWith("\"")) {
                        value = value.substring(1, value.length() - 1);
                    }
                    m = m.withKey(
                            m.getKey() instanceof Json.Literal ?
                                    ((Json.Literal) m.getKey())
                                            .withSource(newKey)
                                            .withValue(value) :
                                    new Json.Literal(Tree.randomId(), m.getKey().getPrefix(), m.getKey().getMarkers(),
                                            newKey, value)
                    );
                }
                return m;
            }
        };
    }
}