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package com.fitbur.bytebuddy.dynamic.scaffold.inline;

import com.fitbur.bytebuddy.description.method.MethodDescription;
import com.fitbur.bytebuddy.utility.RandomString;

/**
 * A method name transformer provides a unique mapping of a method's name to an alternative name.
 *
 * @see MethodRebaseResolver
 */
public interface MethodNameTransformer {

    /**
     * Transforms a method's name to an alternative name. This name must not be equal to any existing method of the
     * created class.
     *
     * @param methodDescription The original method.
     * @return The alternative name.
     */
    String transform(MethodDescription methodDescription);

    /**
     * A method name transformer that adds a fixed suffix to an original method name, separated by a {@code $}.
     */
    class Suffixing implements MethodNameTransformer {

        /**
         * The default suffix to add to an original method name.
         */
        private static final String DEFAULT_SUFFIX = "original$";

        /**
         * The suffix to append to a method name.
         */
        private final String suffix;

        /**
         * Creates a new suffixing method name transformer which adds a default suffix with a random name component.
         *
         * @return A method name transformer that adds a randomized suffix to the original method name.
         */
        public static MethodNameTransformer withRandomSuffix() {
            return new Suffixing(DEFAULT_SUFFIX + RandomString.make());
        }

        /**
         * Creates a new suffixing method name transformer.
         *
         * @param suffix The suffix to add to the method name before the seed.
         */
        public Suffixing(String suffix) {
            this.suffix = suffix;
        }

        @Override
        public String transform(MethodDescription methodDescription) {
            return String.format("%s$%s", methodDescription.getInternalName(), suffix);
        }

        @Override
        public boolean equals(Object other) {
            return this == other || !(other == null || getClass() != other.getClass())
                    && suffix.equals(((Suffixing) other).suffix);
        }

        @Override
        public int hashCode() {
            return suffix.hashCode();
        }

        @Override
        public String toString() {
            return "MethodNameTransformer.Suffixing{" +
                    "suffix='" + suffix + '\'' +
                    '}';
        }
    }

    /**
     * A method name transformer that adds a fixed prefix to an original method name.
     */
    class Prefixing implements MethodNameTransformer {

        /**
         * The default prefix to add to an original method name.
         */
        private static final String DEFAULT_PREFIX = "original";

        /**
         * The prefix that is appended.
         */
        private final String prefix;

        /**
         * Creates a new prefixing method name transformer using a default prefix.
         */
        public Prefixing() {
            this(DEFAULT_PREFIX);
        }

        /**
         * Creates a new prefixing method name transformer.
         *
         * @param prefix The prefix being used.
         */
        public Prefixing(String prefix) {
            this.prefix = prefix;
        }

        @Override
        public String transform(MethodDescription methodDescription) {
            return String.format("%s%s", prefix, methodDescription.getInternalName());
        }

        @Override
        public boolean equals(Object other) {
            return this == other || !(other == null || getClass() != other.getClass())
                    && prefix.equals(((Prefixing) other).prefix);
        }

        @Override
        public int hashCode() {
            return prefix.hashCode();
        }

        @Override
        public String toString() {
            return "MethodNameTransformer.Prefixing{" +
                    "prefix='" + prefix + '\'' +
                    '}';
        }
    }
}