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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau;

import static org.apache.juneau.internal.StringUtils.*;

import java.lang.annotation.*;
import java.util.*;

import org.apache.juneau.annotation.*;
import org.apache.juneau.collections.*;
import org.apache.juneau.internal.*;
import org.apache.juneau.reflect.*;
import org.apache.juneau.svl.*;

/**
 * Class used to add properties to a {@link PropertyStore} from an annotation (e.g. {@link BeanConfig}).
 *
 * @param <T> The annotation that this <c>ConfigApply</c> reads from.
 */
public abstract class ConfigApply<T extends Annotation> {

   private final VarResolverSession r;
   private final Class<T> c;

   /**
    * Constructor.
    *
    * @param c The annotation class.
    * @param r The string resolver to use for resolving strings.
    */
   protected ConfigApply(Class<T> c, VarResolverSession r) {
      this.r = r == null ? VarResolver.DEFAULT.createSession() : r;
      this.c = c;
   }

   /**
    * Apply the specified annotation to the specified property store builder.
    *
    * @param a The annotation.
    * @param ps The property store builder.
    */
   public abstract void apply(AnnotationInfo<T> a, PropertyStoreBuilder ps);


   /**
    * Resolves the specified string.
    *
    * @param in The string containing variables to resolve.
    * @return The resolved string.
    */
   protected String string(String in) {
      return r.resolve(in);
   }

   /**
    * Resolves the specified strings in the string array.
    *
    * @param in The string array containing variables to resolve.
    * @return An array with resolved strings.
    */
   protected String[] strings(String[] in) {
      String[] out = new String[in.length];
      for (int i = 0; i < in.length; i++)
         out[i] = r.resolve(in[i]);
      return out;
   }

   /**
    * Resolves the specified string as a comma-delimited list of strings.
    *
    * @param in The CDL string containing variables to resolve.
    * @return An array with resolved strings.
    */
   protected String[] strings(String in) {
      in = r.resolve(in);
      return StringUtils.split(in);
   }

   /**
    * Resolves the specified strings as a maps of strings-to-strings.
    *
    * @param in The string array containing variables to resolve.
    * @param loc The annotation field name.
    * @return A map of strings-to-strings.
    */
   protected Map<String,String> stringsMap(String[] in, String loc) {
      Map<String,String> m = new LinkedHashMap<>();
      for (String s : strings(in)) {
         for (String s2 : split(s, ';')) {
            int i = s2.indexOf(':');
            if (i == -1)
               throw new ConfigException("Invalid syntax for key/value pair on annotation @{0}({1}): {2}", c.getSimpleName(), loc, s2);
            m.put(s2.substring(0, i).trim(), s2.substring(i+1).trim());
         }
      }
      return m;
   }

   /**
    * Resolves the specified string and converts it to a boolean.
    *
    * @param in The string containing variables to resolve.
    * @return The resolved boolean.
    */
   public boolean bool(String in) {
      return Boolean.parseBoolean(r.resolve(in));
   }

   /**
    * Resolves the specified string and converts it to an int.
    *
    * @param in The string containing variables to resolve.
    * @param loc The annotation field name.
    * @return The resolved int.
    */
   protected int integer(String in, String loc) {
      try {
         return Integer.parseInt(r.resolve(in));
      } catch (NumberFormatException e) {
         throw new ConfigException("Invalid syntax for integer on annotation @{0}({1}): {2}", c.getSimpleName(), loc, in);
      }
   }

   /**
    * Resolves the specified string and converts it to a Visibility.
    *
    * @param in The string containing variables to resolve.
    * @param loc The annotation field name.
    * @return The resolved Visibility.
    */
   protected Visibility visibility(String in, String loc) {
      try {
         return Visibility.valueOf(r.resolve(in));
      } catch (IllegalArgumentException e) {
         throw new ConfigException("Invalid syntax for visibility on annotation @{0}({1}): {2}", c.getSimpleName(), loc, in);
      }
   }

   /**
    * Resolves the specified strings and converts it to an OMap.
    *
    * @param in The strings to be concatenated and parsed into an OMap.
    * @param loc The annotation field name.
    * @return The resolved OMap.
    */
   protected OMap omap(String[] in, String loc) {
      return omap(joinnl(strings(in)), loc);
   }

   /**
    * Resolves the specified string and converts it to an OMap.
    *
    * @param in The string to be parsed into an OMap.
    * @param loc The annotation field name.
    * @return The resolved OMap.
    */
   protected OMap omap(String in, String loc) {
      try {
         if (! isJsonObject(in, true))
            in = "{" + in + "}";
         return OMap.ofJson(in);
      } catch (Exception e) {
         throw new ConfigException("Invalid syntax for Simple-JSON on annotation @{0}({1}): {2}", c.getSimpleName(), loc, in);
      }
   }

   /**
    * Represents a no-op configuration apply.
    */
   public static class NoOp extends ConfigApply<Annotation> {

      /**
       * Constructor.
       *
       * @param c The annotation class.
       * @param r The string resolver to use for resolving strings.
       */
      public NoOp(Class<Annotation> c, VarResolverSession r) {
         super(c, r);
      }

      @Override /* ConfigApply */
      public void apply(AnnotationInfo<Annotation> a, PropertyStoreBuilder ps) {}
   }
}