Added the rest of the Knowledges

architecture.md

@@ -38,13 +38,31 @@ went fine)
 A notification contains only the repo and the issue where the bot has been mentioned. To find the command, the bot searches for the **last** (most recent) comment in the issue
 where it's been mentioned. Only the last mentioning comment will be treated as a command, in order to avoid spamming.
 
-The bot has a [Brain](https://github.com/opencharles/charles-rest/blob/master/src/main/java/com/amihaiemil/charles/github/Brain.java) and at the beginning of each Action, it tries to **understand** the command.
-Understanding a command means building up the [Step](https://github.com/opencharles/charles-rest/blob/master/src/main/java/com/amihaiemil/charles/github/Step.java)s to be executed in order to fulfill the command.
-
-If you look inside class Brain you will see that Steps are instantiated one on top of the other, like an umbrella. Basically, for each command a tree-like structure of steps is built.
-
-Please note that currently class **Brain** has grown quite big and needs to be refactored and broken down in smaller pieces.
-There is an issue for that [here](https://github.com/opencharles/charles-rest/issues/155).
+The bot has a set of knowledges (implementations of Knowledge), which it uses in order to try and "understand" a command.
+Understanding a command means building the tree of steps which are to be executed in order to fulfil the command.
+
+First, the bot puts together all its knowledges, then it uses them to find the proper steps. The last Knowledge in the chain is Confused, which means
+the bot didn't manage to categorize the command and it will leave a Github reply informing the commander about the sitiuation:
+
+```java
+    final Knowledge knowledge = new Conversation(//it can have a convesation
+        new Hello(//it can say hello
+            new IndexSiteKn(//it can index a site
+                this.logs,
+                new IndexSitemapKn(//it can index a site via a sitemap.xml
+                    this.logs,
+                    new IndexPageKn(//it can index a single page
+                        this.logs,
+                        new DeleteIndexKn(//it can delete the idnex
+                            this.logs,
+                            new Confused()//it can be confused (not understand the command)
+                        )
+                    )
+                )
+            )
+        )
+    )
+```
 
 
 ## Steps

src/main/java/com/amihaiemil/charles/github/Action.java

@@ -62,11 +62,6 @@ public class Action {
      */
     private Issue issue;
 
-    /**
-     * Brain of the github agent.
-     */
-    private Brain br;    
-
     /**
      * Location of the logs.
      */
@@ -85,24 +80,54 @@ public Action(Issue issue) throws IOException {
         this.logs = new LogsOnServer(
             System.getProperty("charles.rest.logs.endpoint"), this.id + ".log"
         );
-        this.br = new Brain(this.logger, this.logs);
     }
 
 
     public void perform() {
         ValidCommand command;
         try {
-            logger.info("Started action " + this.id);
-            LastComment lc = new LastComment(issue);
+            this.logger.info("Started action " + this.id);
+            final LastComment lc = new LastComment(issue);
             command = new ValidCommand(lc);
             String commandBody = command.json().getString("body");
-            logger.info("Received command: " + commandBody);
-            Steps steps = br.understand(command);
+            this.logger.info("Received command: " + commandBody);
+
+            final Knowledge knowledge = new Conversation(
+                new Hello(
+                    new IndexSiteKn(
+                        this.logs,
+                        new IndexSitemapKn(
+                            this.logs,
+                            new IndexPageKn(
+                                this.logs,
+                                new DeleteIndexKn(
+                                    this.logs,
+                                    new Confused()
+                                )
+                            )
+                        )
+                    )
+                )
+            );
+
+            final Steps steps = new Steps(
+            	knowledge.handle(command),
+                new SendReply(
+                    new TextReply(
+                        command,
+                        String.format(
+                        	command.language().response("step.failure.comment"),
+                            command.authorLogin(), this.logs.address()
+                        )
+                    ),
+                    new Step.FinalStep("[ERROR] Some step didn't execute properly.")
+                )
+            );
             steps.perform(command, logger);
-        } catch (IllegalArgumentException e) {
-            logger.warn("No command found in the issue or the agent has already replied to the last command!");
-        } catch (IOException e) {
-            logger.error("Action failed entirely with exception: ",  e);
+        } catch (final IllegalArgumentException e) {
+            this.logger.warn("No command found in the issue or the agent has already replied to the last command!");
+        } catch (final IOException e) {
+        	this.logger.error("Action failed entirely with exception: ",  e);
             this.sendReply(
                 new ErrorReply(logs.address(), this.issue)
             );
@@ -117,7 +142,7 @@ private void sendReply(Reply reply) {
         try {
             reply.send();
         } catch (IOException e) {
-            logger.error("FAILED TO REPLY!", e);
+        	this.logger.error("FAILED TO REPLY!", e);
         }
     }