From 519ff4dc5b054b76db341cafeb464ab3645907f4 Mon Sep 17 00:00:00 2001
From: TracentEden <92269743+TracentEden@users.noreply.github.com>
Date: Fri, 30 Aug 2024 14:38:21 +0300
Subject: [PATCH] Change bind to random duration

---
 scripts/globals/spells/enfeebling_spell.lua | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/scripts/globals/spells/enfeebling_spell.lua b/scripts/globals/spells/enfeebling_spell.lua
index 11448ed3c69..9f93da33778 100644
--- a/scripts/globals/spells/enfeebling_spell.lua
+++ b/scripts/globals/spells/enfeebling_spell.lua
@@ -265,6 +265,13 @@ end
 xi.spells.enfeebling.calculateDuration = function(caster, target, spellId, spellEffect, skillType)
     local duration = pTable[spellId][7] -- Get base duration.
 
+    -- BIND spells have a special random duration the follows a normal distribution with mean=30 and std=12
+    if spellEffect == xi.effect.BIND then
+        -- Use the Box-Muller transform to change uniform dist sample to the normal dist sample
+        local z0 = math.sqrt(-2 * math.log(math.random())) * math.cos(2 * math.pi * math.random())
+        duration = utils.clamp(math.floor(30 + z0 * 12), 1, duration)
+    end
+
     -- Additions to base duration.
     if
         spellEffect == xi.effect.BURN or