Better spawn find algorithm (#67)

* rework: `RandomSpawn()`

* change default last spawn index to `-1`

cstrike/addons/amxmodx/scripting/CSDM_ReAPI/csdm_spawn_manager.sma

@@ -11,7 +11,6 @@
 #define FIND_ENT_IN_SPHERE(%1,%2,%3) 	engfunc(EngFunc_FindEntityInSphere, %1, %2, %3)
 
 const MAX_SPAWNS = 64
-const Float:MIN_SPAWN_RADIUS = 450.0 		// beta
 
 // spawn editor options
 const MAX_SEARCH_DISTANCE = 2500
@@ -47,7 +46,7 @@ new Float:g_vecLastOrigin[MAX_CLIENTS + 1][coord_e],
 	Float:g_vecLastAngles[MAX_CLIENTS + 1][coord_e],
 	Float:g_vecLastVAngles[MAX_CLIENTS + 1][coord_e]
 
-new g_pAimedEntity[MAX_CLIENTS + 1], g_iLastSpawnIndex[MAX_CLIENTS + 1], bool:g_bFirstSpawn[MAX_CLIENTS + 1]
+new g_pAimedEntity[MAX_CLIENTS + 1], g_iLastSpawnIndex[MAX_CLIENTS + 1] = { -1, ... }, bool:g_bFirstSpawn[MAX_CLIENTS + 1]
 new g_szSpawnDirectory[PLATFORM_MAX_PATH], g_szSpawnFile[PLATFORM_MAX_PATH + 32], g_szMapName[32]
 new g_iTotalPoints, g_iEditorMenuID, bool:g_bEditSpawns, bool:g_bNotSaved
 new g_iGravity
@@ -175,32 +174,55 @@ RandomSpawn(const pPlayer)
 	if(!g_iTotalPoints || g_bFirstSpawn[pPlayer])
 		return false
 
-	new iRand = random(g_iTotalPoints - 1), iAttempts, iLast = g_iLastSpawnIndex[pPlayer]
-	do
-	{
-		iAttempts++
-		 /* && IsHullVacant(g_vecSpotOrigin[iRand], HULL_HUMAN, DONT_IGNORE_MONSTERS) */
-		if(iRand != iLast && !IsVectorZero(g_vecSpotOrigin[iRand]) && !CheckDistance(pPlayer, g_vecSpotOrigin[iRand]))
-		{
-			SetPlayerPosition(pPlayer, g_vecSpotOrigin[iRand], g_vecSpotVAngles[iRand])
-			g_iLastSpawnIndex[pPlayer] = iRand
-
-			return true
+	new iBestSpawnIdx = -1
+	for(new iAttempt; iAttempt <= 2 && iBestSpawnIdx == -1; iAttempt++) {
+		new iSpawnIdx
+		for( ;iSpawnIdx < g_iTotalPoints; iSpawnIdx++) {
+			if(CheckSpawn(pPlayer, iSpawnIdx, iAttempt)) {
+				iBestSpawnIdx = iSpawnIdx
+				break
+			} else if(iAttempt == 2)
+				break
 		}
 
-		if(++iRand >= g_iTotalPoints) {
-			iRand = random(g_iTotalPoints - 1)
-		}
+		if(iSpawnIdx == (g_iTotalPoints - 1))
+			iSpawnIdx = random(g_iTotalPoints - 1)
+	}
 
-	} while(iAttempts <= g_iTotalPoints)
+	if(iBestSpawnIdx == -1) {
+		g_iLastSpawnIndex[pPlayer] = -1
+		return false
+	}
 
-	return false
+	SetPlayerPosition(pPlayer, g_vecSpotOrigin[iBestSpawnIdx], g_vecSpotVAngles[iBestSpawnIdx])
+	g_iLastSpawnIndex[pPlayer] = iBestSpawnIdx
+
+	return true
+}
+
+bool:CheckSpawn(const pPlayer, const iSpawnIdx, const iAttempt) {
+	if(IsVectorZero(g_vecSpotOrigin[iSpawnIdx]))
+		return false
+
+	if((iAttempt < 1) && CheckDistance(pPlayer, g_vecSpotOrigin[iSpawnIdx], 450.0))
+		return false
+
+	if((iAttempt < 2) && g_iLastSpawnIndex[pPlayer] == iSpawnIdx)
+		return false
+
+	if((iAttempt == 1) && CheckDistance(pPlayer, g_vecSpotOrigin[iSpawnIdx], 100.0))
+		return false
+
+	if(iAttempt == 2) // not found, use default spawn
+		return false
+
+	return true
 }
 
-bool:CheckDistance(const pPlayer, const Float:vecOrigin[coord_e])
+bool:CheckDistance(const pPlayer, const Float:vecOrigin[coord_e], const Float:fDistance)
 {
 	new pEntity = NULLENT
-	while((pEntity = FIND_ENT_IN_SPHERE(pEntity, vecOrigin, MIN_SPAWN_RADIUS)))
+	while((pEntity = FIND_ENT_IN_SPHERE(pEntity, vecOrigin, fDistance)))
 	{
 		if(IsPlayer(pEntity) && pEntity != pPlayer && get_entvar(pEntity, var_deadflag) == DEAD_NO) {
 			// server_print("Client %i fount! skip...", pEntity)