Implement ChallengeLevel completion rewards.

Add methods isLevelDone() and addCompletedLevel() to ChallengesPlayerData object.
Add isLevelCompleted(), validateLevelCompletion() and setLevelComplete() to ChallengesManager.

Add check in TryToComplete after completing challenges first time.

src/main/java/world/bentobox/challenges/ChallengesManager.java

@@ -574,6 +574,49 @@ public void resetAllChallenges(User user, World world)
 	}
 
 
+	/**
+	 * This method returns if given user has been already completed given level.
+	 * @param level Level that must be checked.
+	 * @param user User who need to be checked.
+	 * @return true, if level is already completed.
+	 */
+	public boolean isLevelCompleted(User user, ChallengeLevel level)
+	{
+		this.addPlayer(user);
+		return this.playerCacheData.get(user.getUniqueId()).isLevelDone(level.getUniqueId());
+	}
+
+
+	/**
+	 * This method checks all level challenges and checks if all challenges are done.
+	 * @param level Level that must be checked.
+	 * @param user User who need to be checked.
+	 * @return true, if all challenges are done, otherwise false.
+	 */
+	public boolean validateLevelCompletion(User user, ChallengeLevel level)
+	{
+		this.addPlayer(user);
+		ChallengesPlayerData playerData = this.playerCacheData.get(user.getUniqueId());
+		long doneChallengeCount = level.getChallenges().stream().filter(playerData::isChallengeDone).count();
+
+		return level.getChallenges().size() == doneChallengeCount;
+	}
+
+
+	/**
+	 * This method sets given level as completed.
+	 * @param level Level that must be completed.
+	 * @param user User who complete level.
+	 */
+	public void setLevelComplete(User user, ChallengeLevel level)
+	{
+		this.addPlayer(user);
+		this.playerCacheData.get(user.getUniqueId()).addCompletedLevel(level.getUniqueId());
+		// Save
+		this.savePlayer(user.getUniqueId());
+	}
+
+
 // ---------------------------------------------------------------------
 // Section: Challenges related methods
 // ---------------------------------------------------------------------

src/main/java/world/bentobox/challenges/database/object/ChallengesPlayerData.java

@@ -1,14 +1,13 @@
 package world.bentobox.challenges.database.object;
 
+
+import com.google.gson.annotations.Expose;
+import org.bukkit.World;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 
-import org.bukkit.World;
-
-import com.google.gson.annotations.Expose;
-
 import world.bentobox.bentobox.database.objects.DataObject;
 import world.bentobox.bentobox.util.Util;
 
@@ -235,6 +234,27 @@ public int getTimes(String challengeName)
 	}
 
 
+	/**
+	 * This method adds given level id to completed level set.
+	 * @param uniqueId from ChallengeLevel object.
+	 */
+	public void addCompletedLevel(String uniqueId)
+	{
+		this.levelsDone.add(uniqueId);
+	}
+
+
+	/**
+	 * This method returns if given level is done.
+	 * @param uniqueId  of ChallengeLevel object.
+	 * @return <code>true</code> if level is completed, otherwise <code>false</code>
+	 */
+	public boolean isLevelDone(String uniqueId)
+	{
+		return !this.levelsDone.isEmpty() && this.levelsDone.contains(uniqueId);
+	}
+
+
 	/**
 	 * @see Object#hashCode()
 	 * @return object hashCode value.

src/main/java/world/bentobox/challenges/panel/TryToComplete.java

@@ -21,6 +21,7 @@
 import world.bentobox.challenges.ChallengesManager;
 import world.bentobox.challenges.database.object.Challenge;
 import world.bentobox.challenges.database.object.Challenge.ChallengeType;
+import world.bentobox.challenges.database.object.ChallengeLevel;
 
 
 /**
@@ -243,6 +244,49 @@ public ChallengeResult build()
         // Mark as complete
         this.manager.setChallengeComplete(this.user, this.challenge);
 
+        if (!result.repeat)
+        {
+            ChallengeLevel level = this.manager.getLevel(this.challenge);
+
+            if (!this.manager.isLevelCompleted(this.user, level))
+            {
+                if (this.manager.validateLevelCompletion(this.user, level))
+                {
+                    // Item rewards
+                    for (ItemStack reward : level.getRewardItems())
+                    {
+                        this.user.getInventory().addItem(reward).forEach((k, v) ->
+                            this.user.getWorld().dropItem(this.user.getLocation(), v));
+                    }
+
+                    // Money Reward
+                    if (this.addon.isEconomyProvided())
+                    {
+                        this.addon.getEconomyProvider().deposit(this.user, level.getRewardMoney());
+                    }
+
+                    // Experience Reward
+                    this.user.getPlayer().giveExp(level.getRewardExperience());
+
+                    // Run commands
+                    this.runCommands(level.getRewardCommands());
+
+                    this.user.sendMessage("challenges.you-completed-level", "[level]", level.getFriendlyName());
+
+                    if (this.addon.getChallengesSettings().isBroadcastMessages())
+                    {
+                        for (Player p : this.addon.getServer().getOnlinePlayers())
+                        {
+                            User.getInstance(p).sendMessage("challenges.name-has-completed-level",
+                                "[name]", this.user.getName(), "[level]", level.getFriendlyName());
+                        }
+                    }
+
+                    this.manager.setLevelComplete(this.user, level);
+                }
+            }
+        }
+
         return result;
     }