feat: add spell traits

src/Spell/Spell.lua

@@ -12,7 +12,8 @@ local Spell = {
     lastCastAt = false,
     conditions = {},
     target = false,
-    release_at = false
+    release_at = false,
+    traits = {},
 }
 
 local usableExcludes = {
@@ -325,6 +326,10 @@ end
 -- Check if the spell is castable
 ---@return boolean
 function Spell:Castable()
+    if #self.traits > 0 then
+        return self:EvaluateTraits()
+    end
+
     if self:GetCastableFunction() then
         return self:GetCastableFunction()(self)
     end
@@ -648,4 +653,25 @@ function Spell:IsFree()
     return self:GetCost() == 0
 end
 
+-- AddTraits
+---@param traits table
+---@return Spell
+function Spell:AddTraits(traits)
+    for _, trait in ipairs(traits) do
+        table.insert(self.traits, trait)
+    end
+    return self
+end
+
+-- EvaluateTraits
+---@return boolean
+function Spell:EvaluateTraits()
+    for _, trait in ipairs(self.traits) do
+        if not trait:Evaluate(self) then
+            return false
+        end
+    end
+    return true
+end
+
 return Spell

src/SpellBook/SpellBook.lua

@@ -14,6 +14,7 @@ function SpellBook:New()
 end
 
 -- Get a spell from the spellbook
+---@param id number
 ---@return Spell
 function SpellBook:GetSpell(id)
     if self.spells[id] == nil then

src/SpellTrait/SpellTrait.lua

@@ -0,0 +1,23 @@
+local Tinkr, Bastion = ...
+
+---@class SpellTrait
+local SpellTrait = {}
+SpellTrait.__index = SpellTrait
+
+-- Constructor
+---@param func function
+---@return SpellTrait
+function SpellTrait:New(func)
+    local self = setmetatable({}, SpellTrait)
+    self.func = func
+    return self
+end
+
+-- Evaluate the trait
+---@param spell Spell
+---@return boolean
+function SpellTrait:Evaluate(spell)
+    return self.func(spell)
+end
+
+return SpellTrait

src/_bastion.lua

@@ -96,6 +96,8 @@ function Bastion.Bootstrap()
     ---@type SpellBook
     Bastion.SpellBook = Bastion.require("SpellBook")
     Bastion.Globals.SpellBook = Bastion.SpellBook:New()
+    ---@type SpellTrait
+    Bastion.SpellTrait = Bastion.require("SpellTrait")
     ---@type Item
     Bastion.Item = Bastion.require("Item")
     ---@type ItemBook