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package com.dahuatech.hutool.crypto.asymmetric;

import com.dahuatech.hutool.core.codec.Base64;
import com.dahuatech.hutool.crypto.CryptoException;
import com.dahuatech.hutool.crypto.SecureUtil;

import java.security.Key;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 非对称基础，提供锁、私钥和公钥的持有
 *
 * @author Looly
 * @since 3.3.0
 */
public class BaseAsymmetric> {

  /** 算法 */
  protected String algorithm;
  /** 公钥 */
  protected PublicKey publicKey;
  /** 私钥 */
  protected PrivateKey privateKey;
  /** 锁 */
  protected Lock lock = new ReentrantLock();

  // ------------------------------------------------------------------ Constructor start
  /**
   * 构造
   *
   * 私钥和公钥同时为空时生成一对新的私钥和公钥

   * 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密或者解密
   *
   * @param algorithm 算法
   * @param privateKey 私钥
   * @param publicKey 公钥
   * @since 3.1.1
   */
  public BaseAsymmetric(String algorithm, PrivateKey privateKey, PublicKey publicKey) {
    init(algorithm, privateKey, publicKey);
  }
  // ------------------------------------------------------------------ Constructor end

  /**
   * 初始化

   * 私钥和公钥同时为空时生成一对新的私钥和公钥

   * 私钥和公钥可以单独传入一个，如此则只能使用此钥匙来做加密（签名）或者解密（校验）
   *
   * @param algorithm 算法
   * @param privateKey 私钥
   * @param publicKey 公钥
   * @return this
   */
  @SuppressWarnings("unchecked")
  protected T init(String algorithm, PrivateKey privateKey, PublicKey publicKey) {
    this.algorithm = algorithm;

    if (null == privateKey && null == publicKey) {
      initKeys();
    } else {
      if (null != privateKey) {
        this.privateKey = privateKey;
      }
      if (null != publicKey) {
        this.publicKey = publicKey;
      }
    }
    return (T) this;
  }

  /**
   * 生成公钥和私钥
   *
   * @return this
   */
  @SuppressWarnings("unchecked")
  public T initKeys() {
    KeyPair keyPair = SecureUtil.generateKeyPair(this.algorithm);
    this.publicKey = keyPair.getPublic();
    this.privateKey = keyPair.getPrivate();
    return (T) this;
  }

  // --------------------------------------------------------------------------------- Getters and
  // Setters
  /**
   * 获得公钥
   *
   * @return 获得公钥
   */
  public PublicKey getPublicKey() {
    return this.publicKey;
  }

  /**
   * 设置公钥
   *
   * @param publicKey 公钥
   * @return this
   */
  @SuppressWarnings("unchecked")
  public T setPublicKey(PublicKey publicKey) {
    this.publicKey = publicKey;
    return (T) this;
  }

  /**
   * 获得公钥
   *
   * @return 获得公钥
   */
  public String getPublicKeyBase64() {
    final PublicKey publicKey = getPublicKey();
    return (null == publicKey) ? null : Base64.encode(publicKey.getEncoded());
  }

  /**
   * 获得私钥
   *
   * @return 获得私钥
   */
  public PrivateKey getPrivateKey() {
    return this.privateKey;
  }

  /**
   * 设置私钥
   *
   * @param privateKey 私钥
   * @return this
   */
  @SuppressWarnings("unchecked")
  public T setPrivateKey(PrivateKey privateKey) {
    this.privateKey = privateKey;
    return (T) this;
  }

  /**
   * 获得私钥
   *
   * @return 获得私钥
   */
  public String getPrivateKeyBase64() {
    return Base64.encode(getPrivateKey().getEncoded());
  }

  /**
   * 根据密钥类型获得相应密钥
   *
   * @param type 类型 {@link com.dahuatech.hutool.crypto.asymmetric.KeyType}
   * @return {@link Key}
   */
  protected Key getKeyByType(KeyType type) {
    switch (type) {
      case PrivateKey:
        if (null == this.privateKey) {
          throw new NullPointerException("Private key must not null when use it !");
        }
        return this.privateKey;
      case PublicKey:
        if (null == this.publicKey) {
          throw new NullPointerException("Public key must not null when use it !");
        }
        return this.publicKey;
    }
    throw new CryptoException("Uknown key type: " + type);
  }
}