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package io.slugstack.rewritejavarecipes;

import lombok.Data;
import lombok.EqualsAndHashCode;
import org.openrewrite.Cursor;
import org.openrewrite.ExecutionContext;
import org.openrewrite.Recipe;
import org.openrewrite.TreeVisitor;
import org.openrewrite.internal.StringUtils;
import org.openrewrite.java.JavaIsoVisitor;
import org.openrewrite.java.JavaTemplate;
import org.openrewrite.java.tree.J;
import org.openrewrite.java.tree.TypeUtils;

@Data
@EqualsAndHashCode(callSuper = true)
public class GenerateGetter extends Recipe {

    private final String fieldName;

    @Override
    public String getDisplayName() {
        return "Generate getter";
    }

    @Override
    public String getDescription() {
        return "Generate getter method for a given class field.";
    }

    @Override
    protected TreeVisitor getVisitor() {
        return new GenerateGetterVisitor<>();
    }

    private class GenerateGetterVisitor extends JavaIsoVisitor {
        private final JavaTemplate getter = template("" +
                "public #{} get#{}() {\n" +
                "    return #{};\n" +
                "}"
        ).build();

        @Override
        public J.VariableDeclarations.NamedVariable visitVariable(J.VariableDeclarations.NamedVariable variable, P p) {
            if (variable.isField(getCursor()) && variable.getSimpleName().equals(fieldName)) {
                getCursor().putMessageOnFirstEnclosing(J.ClassDeclaration.class, "varCursor", getCursor());
            }
            return super.visitVariable(variable, p);
        }

        @Override
        public J.ClassDeclaration visitClassDeclaration(J.ClassDeclaration classDecl, P p) {
            J.ClassDeclaration c = super.visitClassDeclaration(classDecl, p);
            Cursor varCursor = getCursor().pollNearestMessage("varCursor");
            if (varCursor != null) {
                J.VariableDeclarations.NamedVariable var = varCursor.getValue();
                c = maybeAutoFormat(c,
                        c.withTemplate(getter, c.getBody().getCoordinates().lastStatement(),
                                TypeUtils.asClass(var.getType()).getClassName(),
                                StringUtils.capitalize(var.getSimpleName()),
                                var.getSimpleName()),
                        p);
            }
            return c;
        }
    }
}