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package org.bukkit.metadata;

import org.apache.commons.lang.Validate;
import org.bukkit.plugin.Plugin;
import org.bukkit.util.NumberConversions;

import java.lang.ref.WeakReference;

/**
 * Optional base class for facilitating MetadataValue implementations.
 * 
 * This provides all the conversion functions for MetadataValue so that
 * writing an implementation of MetadataValue is as simple as implementing
 * value() and invalidate().
 */
public abstract class MetadataValueAdapter implements MetadataValue {
  protected final WeakReference owningPlugin;

  protected MetadataValueAdapter(Plugin owningPlugin) {
    Validate.notNull(owningPlugin, "owningPlugin cannot be null");
    this.owningPlugin = new WeakReference(owningPlugin);
  }

  public Plugin getOwningPlugin() {
    return owningPlugin.get();
  }

  public int asInt() {
    return NumberConversions.toInt(value());
  }

  public float asFloat() {
    return NumberConversions.toFloat(value());
  }

  public double asDouble() {
    return NumberConversions.toDouble(value());
  }

  public long asLong() {
    return NumberConversions.toLong(value());
  }

  public short asShort() {
    return NumberConversions.toShort(value());
  }

  public byte asByte() {
    return NumberConversions.toByte(value());
  }

  public boolean asBoolean() {
    Object value = value();
    if (value instanceof Boolean) {
      return (Boolean) value;
    }

    if (value instanceof Number) {
      return ((Number) value).intValue() != 0;
    }

    if (value instanceof String) {
      return Boolean.parseBoolean((String) value);
    }

    return value != null;
  }

  public String asString() {
    Object value = value();

    if (value == null) {
      return "";
    }
    return value.toString();
  }

}