From dc9c104ad231e6ba9f695072d36d586e2e3d3d4c Mon Sep 17 00:00:00 2001
From: Fedja Beader <fedja@protonmail.ch>
Date: Wed, 10 Apr 2024 16:43:21 +0200
Subject: Add server-wide drop rates modifier

---
 src/map/atcommand.cpp | 28 +++++++++++++++++++++++++---
 src/map/mob.cpp       |  3 +++
 tools/config.py       |  1 +
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/src/map/atcommand.cpp b/src/map/atcommand.cpp
index 6901437..20743dd 100644
--- a/src/map/atcommand.cpp
+++ b/src/map/atcommand.cpp
@@ -1724,13 +1724,32 @@ ATCE atcommand_jexprate(Session *s, dumb_ptr<map_session_data>,
     return ATCE::OKAY;
 }
 
+static
+ATCE atcommand_droprate(Session *s, dumb_ptr<map_session_data>,
+        ZString message)
+{
+    int rate;
+
+    if (!extract(message, &rate) || !rate)
+    {
+        clif_displaymessage(s,
+                "Please, enter a rate adjustement (usage: @droprate <percent>)."_s);
+        return ATCE::USAGE;
+    }
+    battle_config.drop_rate = rate;
+    AString output = STRPRINTF("Drops rate now at %d percent"_fmt, rate);
+    clif_displaymessage(s, output);
+    return ATCE::OKAY;
+}
+
 static
 ATCE atcommand_rates(Session *s, dumb_ptr<map_session_data>,
         ZString message)
 {
     AString output = STRPRINTF(
-            "Experience rates: Base %d%% / Job %d%%. Drop rate: 100%%"_fmt,
-            battle_config.base_exp_rate, battle_config.job_exp_rate);
+            "Experience rates: Base %d%% / Job %d%%. Drop rate: %d%%"_fmt,
+            battle_config.base_exp_rate, battle_config.job_exp_rate,
+            battle_config.drop_rate);
     clif_displaymessage(s, output);
     return ATCE::OKAY;
 }
@@ -5644,9 +5663,12 @@ Map<XString, AtCommandInfo> atcommand_info =
     {"jexprate"_s, {"<percent>"_s,
         60, atcommand_jexprate,
         "Set job exp rate"_s}},
+    {"droprate"_s, {"<percent>"_s,
+        60, atcommand_droprate,
+        "Set drop rate"_s}},
     {"rates"_s, {""_s,
         0, atcommand_rates,
-        "Show base and job exp rates"_s}},
+        "Show base and job exp and drop rates"_s}},
     {"pvpon"_s, {""_s,
         60, atcommand_pvpon,
         "Disable PvP on your map"_s}},
diff --git a/src/map/mob.cpp b/src/map/mob.cpp
index 4fd9d6d..f2f6815 100644
--- a/src/map/mob.cpp
+++ b/src/map/mob.cpp
@@ -2736,6 +2736,9 @@ int mob_damage(dumb_ptr<block_list> src, dumb_ptr<mob_data> md, int damage,
                 if (sd && md && battle_config.pk_mode == 1
                     && (get_mob_db(md->mob_class).lv - sd->status.base_level >= 20))
                     drop_rate.num *= 1.25;  // pk_mode increase drops if 20 level difference [Valaris]
+
+                // server-wide drop rate scaling
+                drop_rate.num = (drop_rate.num * battle_config.drop_rate) / 100;
                 if (!random_::chance(drop_rate))
                     continue;
 
diff --git a/tools/config.py b/tools/config.py
index a187c06..49339bd 100755
--- a/tools/config.py
+++ b/tools/config.py
@@ -601,6 +601,7 @@ def build_config():
     battle_conf.opt('item_third_get_time', milliseconds, '1_s')
     battle_conf.opt('base_exp_rate', percent, '100')
     battle_conf.opt('job_exp_rate', percent, '100')
+    battle_conf.opt('drop_rate', percent, '100')
     battle_conf.opt('death_penalty_type', i32, '0', min='0', max='2')
     battle_conf.opt('death_penalty_base', per10kd, '0')
     battle_conf.opt('death_penalty_job', per10kd, '0')
-- 
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