WIP Level system

lib/goby/battle/battle.rb

@@ -37,8 +37,18 @@ def determine_winner
         end
       end
 
-      #If @entity_a is dead return @entity_b, otherwise return @entity_a
-      entity_a.stats[:hp] <=0 ? entity_b : entity_a
+      # If @entity_a is dead set winner to @entity_b, otherwise @entity_a
+      winner = entity_a.stats[:hp] <=0 ? entity_b : entity_a
+      # Sets loser to entity with 0 or less hp
+      loser = entity_a.stats[:hp] <=0 ? entity_a : entity_b
+      if winner.class != Monster
+        # Gain XP based on opponent
+        gain_xp(winner, loser)
+        # Check if winner can level up
+        winner.check_level
+        # return winner
+      end
+      winner
     end
 
     private
@@ -64,7 +74,42 @@ def someone_dead?
       entity_a.stats[:hp] <= 0 || entity_b.stats[:hp] <= 0
     end
 
+    # Gain XP based on defeated opponent
+    #
+    # @param [Entity] the winner of the battle
+    # @param [Entity] the loser of the battle
+    # @return [Integer] the amount of xp gained
+    def gain_xp(winner, loser)
+      # Monsters should not level up fighting players
+      if winner.class != Monster
+        # Different Mechanics for monster vs pvp
+        if loser.class == Monster
+          # Gain monsters XP
+          xp = winner.stats[:xp] + loser.stats[:xp]
+        else
+          # Calculate XP gain based on level difference
+          level_diff = winner.stats[:level] - loser.stats[:level]
+          # About 10 victories to level up
+          if level_diff == 0
+            xp = (winner.nextLevel(winner.stats[:level]) * 0.01).floor
+          # 10% more XP for each level down
+          elsif level_diff > 0
+            xp = (winner.nextLevel(winner.stats[:level]) * 0.01 * level_diff).floor
+          else
+            amount = 0.01-0.001 * level_diff
+            # Minimum XP gain
+            if amount <= 0
+              amount = 0.001
+            end
+            xp = (winner.nextLevel(winner.stats[:level]) * amount).floor
+          end
+        end
+        winner.set_stats(xp: xp)
+      end
+      xp
+    end
+
     attr_reader :entity_a, :entity_b
   end
 
-end
+end

lib/goby/entity/entity.rb

@@ -18,6 +18,8 @@ class Entity
     # @option stats [Integer] :attack strength in battle. Set to be positive.
     # @option stats [Integer] :defense protection from attacks. Set to be positive.
     # @option stats [Integer] :agility speed of commands in battle. Set to be positive.
+    # @option stats [Integer] :xp experience used to grow levels. Set to be positive.
+    # @option stats [Integer] :current level of entity. Set to be positive.
     # @param [[C(Item, Integer)]] inventory a list of pairs of items and their respective amounts.
     # @param [Integer] gold the currency used for economical transactions.
     # @param [Hash] outfit the collection of equippable items currently worn.
@@ -154,6 +156,8 @@ def print_status
       puts "* Attack: #{@stats[:attack]}"
       puts "* Defense: #{@stats[:defense]}"
       puts "* Agility: #{@stats[:agility]}"
+      puts "* Level: #{@stats[:level]}"
+      puts "* Experience: #{@stats[:xp]}/#{nextLevel(@stats[:level])}"
       print "\n"
 
       puts "Equipment:"
@@ -220,8 +224,10 @@ def set_gold(gold)
     # @option passed_in_stats [Integer] :attack strength in battle. Set to be positive.
     # @option passed_in_stats [Integer] :defense protection from attacks. Set to be positive.
     # @option passed_in_stats [Integer] :agility speed of commands in battle. Set to be positive.
+    # @option passed_in_stats [Integer] :xp experience used to grow levels. Set to be positive.
+    # @option passed_in_stats [Integer] :current level of entity. Set to be positive.
     def set_stats(passed_in_stats)
-      current_stats = @stats || { max_hp: 1, hp: nil, attack: 1, defense: 1, agility: 1 }
+      current_stats = @stats || { max_hp: 1, hp: nil, attack: 1, defense: 1, agility: 1, xp: 1, level: 1 }
       constructed_stats = current_stats.merge(passed_in_stats)
 
       # Set hp to max_hp if hp not specified
@@ -232,14 +238,51 @@ def set_stats(passed_in_stats)
       constructed_stats[:hp] = constructed_stats[:hp] > 0 ? constructed_stats[:hp] : 0
       #ensure all other stats > 0
       constructed_stats.each do |key,value|
-        if [:max_hp, :attack, :defense, :agility].include?(key)
+        if [:max_hp, :attack, :defense, :agility, :xp, :level].include?(key)
           constructed_stats[key] = value.nonpositive? ? 1 : value
         end
       end
-
       @stats = constructed_stats
     end
 
+    #calculates XP needed to reach the next level
+    #
+    # @param [Integer] :current level of the entity
+    def nextLevel(level)
+      #set for growth rate
+      exponent = 1.5
+      #set for starting level XP
+      baseXP = 100
+      (baseXP * (level ** exponent)).floor
+    end
+
+    # checks if player should grow in level based on xp
+    def check_level
+      while @stats[:xp] > nextLevel(@stats[:level])
+        growLevel
+      end
+    end
+
+    # increases stats when growing a level
+    def grow_level
+      hp = @stats[max_hp] * perecent_level_growth
+      attack = @stats[attack] * perecent_level_growth
+      defense = @stats[defense] * perecent_level_growth
+      agility = @stats[agility] * perecent_level_growth
+      xp = @stats[:xp] - nextLevel(@stats[:level])
+      if xp <= 0
+        xp = 1
+      end
+      level = @stats[:level] + 1
+      new_stats = {max_hp: hp, hp: hp, attack: attack, defense: defense, agility: agility, xp: xp, level: level}
+      set_stats(new_stats)
+    end
+
+    # defines how much stats should grow per level currently 8-12%
+    def perecent_level_growth
+      rand(8..12) * 0.01
+    end
+
     # getter for stats
     #
     # @return [Object]