From cf975e24ad1487a4219fee9021210eb9e294cfc0 Mon Sep 17 00:00:00 2001
From: Curtis Merrill <curtis.r.merrill@gmail.com>
Date: Wed, 11 Mar 2020 02:56:16 -0400
Subject: [PATCH] Traps can cast spells (#38122)

---
 data/mods/Magiclysm/Spells/monsterspells.json | 18 ++++++++++++++++++
 data/mods/Magiclysm/traps.json                | 15 +++++++++++++++
 src/trap.cpp                                  |  1 +
 src/trap.h                                    |  4 ++++
 src/trapfunc.cpp                              | 15 +++++++++++++++
 5 files changed, 53 insertions(+)
 create mode 100644 data/mods/Magiclysm/traps.json

diff --git a/data/mods/Magiclysm/Spells/monsterspells.json b/data/mods/Magiclysm/Spells/monsterspells.json
index 6b214b04d9076..f9e5eab85b216 100644
--- a/data/mods/Magiclysm/Spells/monsterspells.json
+++ b/data/mods/Magiclysm/Spells/monsterspells.json
@@ -17,6 +17,24 @@
     "effect": "projectile_attack",
     "extra_effects": [ { "id": "light_healing", "hit_self": true } ]
   },
+  {
+    "id": "bear_trap",
+    "type": "SPELL",
+    "name": "Bear Trap",
+    "description": "A trap that summons bears!  Not what you were expecting, is it?",
+    "valid_targets": [ "ground" ],
+    "flags": [ "HOSTILE_SUMMON", "LOUD" ],
+    "min_damage": 3,
+    "max_damage": 3,
+    "min_aoe": 5,
+    "max_aoe": 5,
+    "sound_description": "\"It's a trap!\"",
+    "min_duration": 30000,
+    "max_duration": 30000,
+    "sound_type": "speech",
+    "effect": "summon",
+    "effect_str": "mon_bear"
+  },
   {
     "id": "rocket_punch",
     "type": "SPELL",
diff --git a/data/mods/Magiclysm/traps.json b/data/mods/Magiclysm/traps.json
new file mode 100644
index 0000000000000..278152784cf32
--- /dev/null
+++ b/data/mods/Magiclysm/traps.json
@@ -0,0 +1,15 @@
+[
+  {
+    "type": "trap",
+    "id": "tr_bear",
+    "name": "bear trap",
+    "color": "blue",
+    "symbol": "^",
+    "action": "spell",
+    "visibility": 2,
+    "trap_radius": 2,
+    "avoidance": 99,
+    "difficulty": 99,
+    "spell_data": { "id": "bear_trap" }
+  }
+]
diff --git a/src/trap.cpp b/src/trap.cpp
index 55e33760dc4b0..d872af3744749 100644
--- a/src/trap.cpp
+++ b/src/trap.cpp
@@ -122,6 +122,7 @@ void trap::load( const JsonObject &jo, const std::string & )
     optional( jo, was_loaded, "funnel_radius", funnel_radius_mm, 0 );
     optional( jo, was_loaded, "comfort", comfort, 0 );
     optional( jo, was_loaded, "floor_bedding_warmth", floor_bedding_warmth, 0 );
+    optional( jo, was_loaded, "spell_data", spell_data );
     assign( jo, "trigger_weight", trigger_weight );
     for( const JsonValue entry : jo.get_array( "drops" ) ) {
         std::string item_type;
diff --git a/src/trap.h b/src/trap.h
index d93fcb6d76e85..038a66793e6f8 100644
--- a/src/trap.h
+++ b/src/trap.h
@@ -10,6 +10,7 @@
 
 #include "color.h"
 #include "int_id.h"
+#include "magic.h"
 #include "string_id.h"
 #include "translations.h"
 #include "type_id.h"
@@ -62,6 +63,7 @@ bool shadow( const tripoint &p, Creature *c, item *i );
 bool map_regen( const tripoint &p, Creature *c, item *i );
 bool drain( const tripoint &p, Creature *c, item *i );
 bool snake( const tripoint &p, Creature *c, item *i );
+bool cast_spell( const tripoint &p, Creature *critter, item * );
 } // namespace trapfunc
 
 struct vehicle_handle_trap_data {
@@ -116,6 +118,8 @@ struct trap {
         // For disassembly?
         std::vector<std::tuple<std::string, int, int>> components;
     public:
+        // data required for trapfunc::spell()
+        fake_spell spell_data;
         int comfort = 0;
         int floor_bedding_warmth = 0;
     public:
diff --git a/src/trapfunc.cpp b/src/trapfunc.cpp
index 62624a49fa47b..6730a6f14e0a3 100644
--- a/src/trapfunc.cpp
+++ b/src/trapfunc.cpp
@@ -17,6 +17,7 @@
 #include "messages.h"
 #include "monster.h"
 #include "mtype.h"
+#include "npc.h"
 #include "output.h"
 #include "overmapbuffer.h"
 #include "rng.h"
@@ -1398,6 +1399,19 @@ bool trapfunc::drain( const tripoint &, Creature *c, item * )
     return false;
 }
 
+bool trapfunc::cast_spell( const tripoint &p, Creature *critter, item * )
+{
+    if( critter == nullptr ) {
+        return false;
+    }
+    const spell trap_spell = g->m.tr_at( p ).spell_data.get_spell( 0 );
+    npc dummy;
+    trap_spell.cast_all_effects( dummy, critter->pos() );
+    trap_spell.make_sound( p, 20 );
+    g->m.remove_trap( p );
+    return true;
+}
+
 bool trapfunc::snake( const tripoint &p, Creature *, item * )
 {
     //~ the sound a snake makes
@@ -1471,6 +1485,7 @@ const trap_function &trap_function_from_string( const std::string &function_name
             { "shadow", trapfunc::shadow },
             { "map_regen", trapfunc::map_regen },
             { "drain", trapfunc::drain },
+            { "spell", trapfunc::cast_spell },
             { "snake", trapfunc::snake }
         }
     };