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package com.emv.qrcode.decoder.cpm;

import java.lang.reflect.Constructor;
import java.util.AbstractMap.SimpleEntry;
import java.util.Base64;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.BiConsumer;

import com.emv.qrcode.core.configuration.DecodersCpmMap;
import com.emv.qrcode.core.exception.PresentedModeException;

// @formatter:off
public abstract class DecoderCpm {

  private static final Map, Constructor>> ctorMap = new ConcurrentHashMap<>();

  protected final Iterator iterator;

  protected DecoderCpm(final byte[] source) {
    this.iterator = new DecodeCpmIterator(source);
  }

  protected abstract T decode() throws PresentedModeException;

  protected static  Entry, BiConsumer> consumerTagLengthValue(final Class clazz, final BiConsumer consumer) {
    return new SimpleEntry<>(clazz, consumer);
  }

  /**
   * Decode CPM using Base64 string encoded
   *
   * @param  target class
   * @param source base64 string CPM
   * @param clazz target class
   * @return target class result
   * @throws PresentedModeException
   */
  public static final  T decode(final String source, final Class clazz) throws PresentedModeException {
    return decode(Base64.getDecoder().decode(source), clazz);
  }

  /**
   * Decode CPM using byte array
   *
   * @param  target class
   * @param source byte array CPM
   * @param clazz target class
   * @return target class result
   * @throws PresentedModeException
   */
  public static final  T decode(final byte[] source, final Class clazz) throws PresentedModeException {
    try {
      final Class> parserClass = DecodersCpmMap.getDecoder(clazz);

      if (!ctorMap.containsKey(clazz)) {
        ctorMap.put(clazz, parserClass.getConstructor(byte[].class));
      }

      final Constructor> ctor = ctorMap.get(clazz);
      final DecoderCpm parser = ctor.newInstance(source);
      return clazz.cast(parser.decode());
    } catch (final PresentedModeException ex) {
      throw ex;
    } catch (final Exception ex) {
      throw new RuntimeException(ex);
    }
  }

}
// @formatter:on