cp_mission_recon.cpp

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/*
Copyright (C) 2002-2023 UFO: Alien Invasion.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#include "../../../DateTime.h"
#include "../../../cl_shared.h"
#include "../cp_campaign.h"
#include "../cp_alienbase.h"
#include "../cp_geoscape.h"
#include "../cp_ufo.h"
#include "../cp_missions.h"
#include "../cp_time.h"
#include "../cp_xvi.h"
#include "../cp_alien_interest.h"
#include "cp_mission_recon.h"

static void CP_ReconMissionIsSuccess (mission_t* mission)
{
    INT_ChangeIndividualInterest(-0.2f, INTERESTCATEGORY_RECON);
    INT_ChangeIndividualInterest(0.1f, INTERESTCATEGORY_HARVEST);
    if (AB_GetAlienBaseNumber())
        INT_ChangeIndividualInterest(0.1f, INTERESTCATEGORY_SUPPLY);
    if (CP_IsXVIStarted())
        INT_ChangeIndividualInterest(0.1f, INTERESTCATEGORY_XVI);

    CP_MissionRemove(mission);
}

void CP_ReconMissionIsFailure (mission_t* mission)
{
    INT_ChangeIndividualInterest(0.05f, INTERESTCATEGORY_RECON);
    INT_ChangeIndividualInterest(0.1f, INTERESTCATEGORY_INTERCEPT);
    INT_ChangeIndividualInterest(0.05f, INTERESTCATEGORY_TERROR_ATTACK);

    CP_MissionRemove(mission);
}

void CP_ReconMissionLeave (mission_t* mission)
{
    mission->stage = STAGE_RETURN_TO_ORBIT;

    if (mission->ufo) {
        CP_MissionDisableTimeLimit(mission);
        UFO_SetRandomDest(mission->ufo);
        /* Display UFO on geoscape if it is detected */
        mission->ufo->landed = false;
    } else {
        /* Go to next stage on next frame */
        mission->finalDate = ccs.date;
    }
    CP_MissionRemoveFromGeoscape(mission);
}

static bool CP_ReconMissionChoose (mission_t* mission)
{
    /* mission without UFO is always a ground mission */
    if (!mission->ufo)
        return false;

    return (frand() > 0.5f);
}

void CP_ReconMissionAerial (mission_t* mission)
{
    const DateTime minReconDelay(1, 0);
    const DateTime maxReconDelay(2, 0);     /* How long the UFO will fly on earth */

    assert(mission->ufo);

    mission->stage = STAGE_RECON_AIR;

    mission->finalDate = ccs.date + Date_Random(minReconDelay, maxReconDelay);
}

void CP_ReconMissionGroundGo (mission_t* mission)
{

    mission->stage = STAGE_MISSION_GOTO;

    /* maybe the UFO just finished a ground mission and starts a new one? */
    if (mission->ufo) {
        CP_MissionRemoveFromGeoscape(mission);
        mission->ufo->landed = false;
    }

    /* Choose a map */
    if (CP_ChooseMap(mission, nullptr)) {
        int counter;
        for (counter = 0; counter < MAX_POS_LOOP; counter++) {
            if (!CP_GetRandomPosOnGeoscapeWithParameters(mission->pos, mission->mapDef->terrains, mission->mapDef->cultures, mission->mapDef->populations, nullptr))
                continue;
            if (GEO_PositionCloseToBase(mission->pos))
                continue;
            mission->posAssigned = true;
            break;
        }
        if (counter >= MAX_POS_LOOP) {
            cgi->Com_Printf("CP_ReconMissionGroundGo: Error, could not set position.\n");
            CP_MissionRemove(mission);
            return;
        }
    } else {
        cgi->Com_Printf("CP_ReconMissionGroundGo: No map found, remove mission.\n");
        CP_MissionRemove(mission);
        return;
    }

    if (mission->ufo) {
        CP_MissionDisableTimeLimit(mission);
        UFO_SendToDestination(mission->ufo, mission->pos);
    } else {
        /* Go to next stage on next frame */
        mission->finalDate = ccs.date;
    }
}

static void CP_ReconMissionGround (mission_t* mission)
{
    mission->stage = STAGE_RECON_GROUND;
    mission->posAssigned = true;

    const DateTime minMissionDelay(2, 0);
    const DateTime maxMissionDelay(3, 0);
    mission->finalDate = ccs.date + Date_Random(minMissionDelay, maxMissionDelay);
    /* ufo becomes invisible on geoscape, but don't remove it from ufo global array (may reappear)*/
    if (mission->ufo)
        CP_UFORemoveFromGeoscape(mission, false);
    /* mission appear on geoscape, player can go there */
    CP_MissionAddToGeoscape(mission, false);
}

static bool CP_ReconMissionNewGroundMission (mission_t* mission)
{
    return (frand() > 0.7f);
}

static void CP_ReconMissionSelect (mission_t* mission)
{
    if (mission->stage == STAGE_COME_FROM_ORBIT) {
        /* this is the begining of the mission: choose between aerial or ground mission */
        if (CP_ReconMissionChoose(mission))
            /* This is a aerial mission */
            CP_ReconMissionAerial(mission);
        else
            /* This is a ground mission */
            CP_ReconMissionGroundGo(mission);
    } else if (mission->stage == STAGE_RECON_GROUND) {
        /* Ground mission may occur several times */
        if (CP_ReconMissionNewGroundMission(mission))
            CP_ReconMissionGroundGo(mission);
        else
            CP_ReconMissionLeave(mission);
    }
}

void CP_ReconMissionNextStage (mission_t* mission)
{
    switch (mission->stage) {
    case STAGE_NOT_ACTIVE:
        /* Create Recon mission */
        CP_MissionBegin(mission);
        break;
    case STAGE_COME_FROM_ORBIT:
    case STAGE_RECON_GROUND:
        /* Choose if a new ground mission should be started */
        CP_ReconMissionSelect(mission);
        break;
    case STAGE_MISSION_GOTO:
        /* just arrived on a new ground mission: start it */
        CP_ReconMissionGround(mission);
        break;
    case STAGE_RECON_AIR:
        /* Leave earth */
        CP_ReconMissionLeave(mission);
        break;
    case STAGE_RETURN_TO_ORBIT:
        /* mission is over, remove mission */
        CP_ReconMissionIsSuccess(mission);
        break;
    default:
        cgi->Com_Printf("CP_ReconMissionNextStage: Unknown stage: %i, removing mission.\n", mission->stage);
        CP_MissionRemove(mission);
        break;
    }
}