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 * Copyright (C) 2026, Leo Galambos
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 *    This product includes software developed by the Egothor project.
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package zeroecho.sdk.builders.core;

import java.util.Objects;

import zeroecho.sdk.content.api.PlainContent;
import zeroecho.sdk.content.builtin.PlainBytes;

/**
 * Builder interface for constructing {@link PlainBytes} instances that
 * encapsulate unencrypted byte array content.
 * <p>
 * This builder allows specifying a raw byte array to be wrapped as
 * {@code PlainContent}, which can be used as input for cryptographic operations
 * or as standalone plaintext data.
 * <p>
 * The {@link #build(boolean)} method accepts an {@code encrypt} flag for API
 * consistency, but the flag has no effect for plain byte content.
 *
 * <p>
 * <strong>Usage example:</strong>
 * 
 * <pre>{@code
 * PlainContent content = PlainBytesBuilder.builder()
 *     .bytes(new byte[] { 1, 2, 3, 4 })
 *     .build(false); // encrypt flag is ignored for PlainBytes
 * }</pre>
 *
 * @see PlainBytes
 */
public interface PlainBytesBuilder extends DataContentBuilder<PlainContent> {

    /**
     * Sets the byte array content to be wrapped by {@link PlainBytes}.
     *
     * @param bytes the byte array; must not be null
     * @return this builder instance for method chaining
     * @throws NullPointerException if {@code bytes} is null
     */
    PlainBytesBuilder bytes(byte[] bytes);

    /**
     * Creates a new instance of the default builder implementation.
     *
     * @return a new {@code PlainBytesBuilder}
     */
    static PlainBytesBuilder builder() {
        return new DefaultPlainBytesBuilder();
    }

    /**
     * Default implementation of the {@link PlainBytesBuilder} interface.
     * <p>
     * Builds a {@link PlainBytes} instance wrapping the specified byte array.
     * </p>
     */
    final class DefaultPlainBytesBuilder implements PlainBytesBuilder {
        private byte[] bytesField;

        private DefaultPlainBytesBuilder() {
        }

        @Override
        public PlainBytesBuilder bytes(final byte[] bytes) {
            this.bytesField = Objects.requireNonNull(bytes, "bytes must not be null");
            return this;
        }

        @Override
        public PlainContent build(final boolean encrypt) {
            if (bytesField == null) {
                throw new IllegalStateException("bytes must be set before building");
            }
            return new PlainBytes(bytesField);
        }
    }
}
