1 /*
2 * Seven Kingdoms: Ancient Adversaries
3 *
4 * Copyright 1997,1998 Enlight Software Ltd.
5 *
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21 //Filename : OAI_DEFE.CPP
22 //Description: AI on defense
23
24 #include <ALL.h>
25 #include <OTALKRES.h>
26 #include <ONATION.h>
27
28 //----- Begin of function Nation::ai_defend -----//
29 //
30 // <int> attackerUnitRecno - unit recno of the attacker.
31 //
ai_defend(int attackerUnitRecno)32 int Nation::ai_defend(int attackerUnitRecno)
33 {
34 //--- don't call for defense too frequently, only call once 7 days (since this function will be called every time our king/firm/town is attacked, so this filtering is necessary ---//
35
36 if( info.game_date < ai_last_defend_action_date+7 )
37 return 0;
38
39 ai_last_defend_action_date = info.game_date;
40
41 //---------- analyse the situation first -----------//
42
43 Unit* attackerUnit = unit_array[attackerUnitRecno];
44
45 err_when( attackerUnit->nation_recno == nation_recno );
46
47 int attackerXLoc = attackerUnit->next_x_loc();
48 int attackerYLoc = attackerUnit->next_y_loc();
49
50 int hasWar;
51
52 int enemyCombatLevel = mobile_defense_combat_level( attackerXLoc, attackerYLoc,
53 attackerUnit->nation_recno, 0, hasWar ); // 0-don't return immediately even if there is war around this town
54
55 //-- the value returned is enemy strength minus your own strength, so if it's positive, it means that your enemy is stronger than you, otherwise you're stronger than your enemy --//
56
57 int attackCombatLevel = ai_attack_target(attackerXLoc, attackerYLoc, enemyCombatLevel, 1); // 1-defense mode
58
59 //------ request military aid from allies ----//
60
61 if( attackCombatLevel < enemyCombatLevel && attackerUnit->nation_recno )
62 {
63 ai_request_military_aid();
64 }
65
66 return 1;
67 }
68 //----- End of function Nation::ai_defend -----//
69
70
71 //----- Begin of function Nation::ai_request_military_aid -----//
72 //
73 // Request allied nations to provide immediate military aid.
74 //
ai_request_military_aid()75 int Nation::ai_request_military_aid()
76 {
77 for( int i=nation_array.size() ; i>0 ; i-- )
78 {
79 if( nation_array.is_deleted(i) )
80 continue;
81
82 if( get_relation(i)->status != NATION_ALLIANCE )
83 continue;
84
85 if( should_diplomacy_retry(TALK_REQUEST_MILITARY_AID, i) )
86 {
87 talk_res.ai_send_talk_msg(i, nation_recno, TALK_REQUEST_MILITARY_AID);
88 return 1;
89 }
90 }
91
92 return 0;
93 }
94 //----- End of function Nation::ai_request_military_aid -----//
95