From 41aff3ee3c01e50d8eca3a85467b66278eaa3436 Mon Sep 17 00:00:00 2001
From: Steve <stephenjsweeney@battleforthesolarsystem.com>
Date: Sun, 22 May 2016 12:08:19 +0100
Subject: [PATCH] Added ability for enemy fighters to surrender, if
 AIF_SURRENDERS is set.

---
 src/battle/ai.c       | 55 +++++++++++++++++++++++++++++++++++++++++++
 src/battle/fighters.c |  5 ++++
 src/defs.h            |  3 +++
 src/game/stats.c      |  1 +
 src/system/lookup.c   |  1 +
 5 files changed, 65 insertions(+)

diff --git a/src/battle/ai.c b/src/battle/ai.c
index 7307366..95db6d1 100644
--- a/src/battle/ai.c
+++ b/src/battle/ai.c
@@ -53,6 +53,8 @@ static void wander(void);
 static void doWander(void);
 static int selectWeaponForTarget(Entity *e);
 static void deployMine(void);
+static int isSurrendering(void);
+static void doSurrender(void);
 
 void doAI(void)
 {
@@ -103,6 +105,11 @@ void doAI(void)
 		return;
 	}
 	
+	if ((self->aiFlags & AIF_SURRENDERS) && (battle.stats[STAT_TIME] % 6 == 0) && isSurrendering())
+	{
+		return;
+	}
+	
 	if (!(self->aiFlags & AIF_AVOIDS_COMBAT))
 	{
 		if (self->speed)
@@ -583,6 +590,54 @@ static int isRetreating(void)
 	return self->flags & EF_RETREATING;
 }
 
+static int isSurrendering(void)
+{
+	float chance;
+	
+	if (!(self->flags & EF_SURRENDERED))
+	{
+		if (self->health < self->maxHealth)
+		{
+			chance = self->health;
+			chance /= self->maxHealth;
+			chance *= 100;
+			
+			if (rand() % 100 > chance)
+			{
+				self->aiActionTime = FPS * 3;
+				
+				self->aiFlags |= AIF_AVOIDS_COMBAT;
+				self->aiFlags &= ~AIF_SURRENDERS;
+				
+				self->flags |= EF_MUST_DISABLE;
+				self->flags |= EF_MISSION_TARGET;
+				
+				self->action = doSurrender;
+				
+				battle.stats[STAT_ENEMIES_SURRENDERED]++;
+				
+				runScriptFunction("ENEMY_SURRENDERED %d", battle.stats[STAT_ENEMIES_SURRENDERED]);
+				
+				addHudMessage(colors.white, _("%s has surrendered"), self->name);
+				
+				return 1;
+			}
+		}
+	}
+	
+	return 0;
+}
+
+static void doSurrender(void)
+{
+	if (--self->aiActionTime <= 0)
+	{
+		self->flags |= EF_SURRENDERED;
+		
+		nextAction();
+	}
+}
+
 static int nearEnemies(void)
 {
 	int i, numEnemies, x, y;
diff --git a/src/battle/fighters.c b/src/battle/fighters.c
index 89dc7fb..07a6063 100644
--- a/src/battle/fighters.c
+++ b/src/battle/fighters.c
@@ -345,6 +345,11 @@ void doFighter(void)
 
 			updateCondition(self->name, TT_DESTROY);
 			updateCondition(self->groupName, TT_DESTROY);
+			
+			if (self->flags & EF_SURRENDERED)
+			{
+				updateCondition("SURRENDERED", TT_DESTROY);
+			}
 		}
 	}
 }
diff --git a/src/defs.h b/src/defs.h
index e4b1020..85010a0 100644
--- a/src/defs.h
+++ b/src/defs.h
@@ -109,6 +109,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #define EF_NO_THREAT			(2 << 23)
 #define EF_DROPS_ITEMS			(2 << 24)
 #define EF_COMMON_FIGHTER		(2 << 25)
+#define EF_SURRENDERED			(2 << 26)
 
 #define AIF_NONE				0
 #define AIF_FOLLOWS_PLAYER		(2 << 0)
@@ -132,6 +133,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #define AIF_ASSASSIN			(2 << 18)
 #define AIF_SUSPICIOUS			(2 << 19)
 #define AIF_ZAK_SUSPICIOUS		(2 << 20)
+#define AIF_SURRENDERS			(2 << 21)
 
 /* player abilities */
 #define BOOST_RECHARGE_TIME 	(FPS * 7)
@@ -376,6 +378,7 @@ enum
 	STAT_CAPITAL_SHIPS_DESTROYED,
 	STAT_CAPITAL_SHIPS_LOST,
 	STAT_MINES_DESTROYED,
+	STAT_ENEMIES_SURRENDERED,
 	/* add stats before here, so as not to mess up the stats screen */
 	STAT_TIME,
 	STAT_MAX
diff --git a/src/game/stats.c b/src/game/stats.c
index 671162d..6a64d74 100644
--- a/src/game/stats.c
+++ b/src/game/stats.c
@@ -70,6 +70,7 @@ void initStats(void)
 	statDescription[STAT_CAPITAL_SHIPS_DESTROYED] = _("Capital Ships Destroyed");
 	statDescription[STAT_CAPITAL_SHIPS_LOST] = _("Capital Ships Lost");
 	statDescription[STAT_MINES_DESTROYED] = _("Mines Destroyed");
+	statDescription[STAT_ENEMIES_SURRENDERED] = _("Enemies Surrendered");
 	statDescription[STAT_TIME] = _("Time Played");
 }
 
diff --git a/src/system/lookup.c b/src/system/lookup.c
index 6b21b95..7274ef2 100644
--- a/src/system/lookup.c
+++ b/src/system/lookup.c
@@ -93,6 +93,7 @@ void initLookups(void)
 	addLookup("AIF_ASSASSIN", AIF_ASSASSIN);
 	addLookup("AIF_SUSPICIOUS", AIF_SUSPICIOUS);
 	addLookup("AIF_ZAK_SUSPICIOUS", AIF_ZAK_SUSPICIOUS);
+	addLookup("AIF_SURRENDERS", AIF_SURRENDERS);
 
 	addLookup("DT_ANY", DT_ANY);
 	addLookup("DT_NO_SPIN", DT_NO_SPIN);