From af5313d89ef7eae2dded8ea4faf312ef950c3024 Mon Sep 17 00:00:00 2001
From: David Chavez <david@dcvz.io>
Date: Sat, 27 Aug 2022 02:03:50 +0200
Subject: [PATCH] Add OneHit KO (#27)

---
 soh/soh/Enhancements/debugconsole.cpp               | 11 +++++++++--
 soh/soh/Enhancements/debugconsole.h                 |  1 +
 soh/src/code/z_parameter.c                          | 10 ++++++++++
 soh/src/overlays/actors/ovl_player_actor/z_player.c |  3 +--
 4 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/soh/soh/Enhancements/debugconsole.cpp b/soh/soh/Enhancements/debugconsole.cpp
index 5962c82d047..253a57741cd 100644
--- a/soh/soh/Enhancements/debugconsole.cpp
+++ b/soh/soh/Enhancements/debugconsole.cpp
@@ -36,6 +36,7 @@ uint32_t minishLink;
 uint32_t gravityLevel;
 uint32_t resetLinkScale;
 uint32_t invisibleLink;
+uint32_t oneHitKO;
 
 static bool ActorSpawnHandler(std::shared_ptr<Ship::Console> Console, const std::vector<std::string>& args) {
     if ((args.size() != 9) && (args.size() != 3) && (args.size() != 6)) {
@@ -631,7 +632,13 @@ static bool OneHitKOHandler(std::shared_ptr<Ship::Console> Console, const std::v
         return CMD_FAILED;
     }
 
-    // TODO: Implement
+    try {
+        oneHitKO = std::stoi(args[1], nullptr, 10) == 0 ? 0 : 1;
+        return CMD_SUCCESS;
+    } catch (std::invalid_argument const& ex) {
+        SohImGui::console->SendErrorMessage("[SOH] One-hit KO value must be a number.");
+        return CMD_FAILED;
+    }
 }
 
 static bool PacifistHandler(std::shared_ptr<Ship::Console> Console, const std::vector<std::string>& args) {
@@ -975,7 +982,7 @@ void DebugConsole_Init(void) {
         { "value", Ship::ArgumentType::NUMBER }
     }});
 
-    CMD_REGISTER("ohko", { OneHitKOHandler, "Activates one hit KO.", {
+    CMD_REGISTER("ohko", { OneHitKOHandler, "Activates one hit KO. Any damage kills Link and he cannot gain health in this mode.", {
         { "value", Ship::ArgumentType::NUMBER }
     }});
 
diff --git a/soh/soh/Enhancements/debugconsole.h b/soh/soh/Enhancements/debugconsole.h
index 9a3c3c72b35..2ffe2f4329d 100644
--- a/soh/soh/Enhancements/debugconsole.h
+++ b/soh/soh/Enhancements/debugconsole.h
@@ -10,6 +10,7 @@ extern uint32_t minishLink;
 extern uint32_t gravityLevel;
 extern uint32_t resetLinkScale;
 extern uint32_t invisibleLink;
+extern uint32_t oneHitKO;
 #ifdef __cplusplus
 }
 #endif
diff --git a/soh/src/code/z_parameter.c b/soh/src/code/z_parameter.c
index 046729a065d..8e43bcf7f1a 100644
--- a/soh/src/code/z_parameter.c
+++ b/soh/src/code/z_parameter.c
@@ -10,6 +10,8 @@
 #include <assert.h>
 #endif
 
+#include "soh/Enhancements/debugconsole.h"
+
 
 static uint16_t _doActionTexWidth, _doActionTexHeight = -1;
 static uint16_t DO_ACTION_TEX_WIDTH() {
@@ -2641,6 +2643,14 @@ s32 Health_ChangeBy(GlobalContext* globalCtx, s16 healthChange) {
     osSyncPrintf("＊＊＊＊＊  増減=%d (now=%d, max=%d)  ＊＊＊", healthChange, gSaveContext.health,
                  gSaveContext.healthCapacity);
 
+    // If one-hit ko mode is on, any damage kills you and you cannot gain health.
+    if (oneHitKO) {
+        if (healthChange < 0)
+            gSaveContext.health = 0;
+        
+        return 0;
+    }
+
     // clang-format off
     if (healthChange > 0) { Audio_PlaySoundGeneral(NA_SE_SY_HP_RECOVER, &D_801333D4, 4,
                                                    &D_801333E0, &D_801333E0, &D_801333E8);
diff --git a/soh/src/overlays/actors/ovl_player_actor/z_player.c b/soh/src/overlays/actors/ovl_player_actor/z_player.c
index 3f7c7b4f894..d9994bed606 100644
--- a/soh/src/overlays/actors/ovl_player_actor/z_player.c
+++ b/soh/src/overlays/actors/ovl_player_actor/z_player.c
@@ -3607,8 +3607,7 @@ s32 func_80837B18_modified(GlobalContext* globalCtx, Player* this, s32 damage, u
     }
 
     s32 modifiedDamage = damage;
-    if (modified)
-    {
+    if (modified) {
        modifiedDamage *= (1 << CVar_GetS32("gDamageMul", 0));
     }