cp_mission_harvest.cpp

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/*
Copyright (C) 2002-2020 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 "../../../cl_shared.h"
#include "../cp_campaign.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_harvest.h"
#include "cp_mission_recon.h"

static void CP_HarvestMissionIsSuccess (mission_t* mission)
{
    INT_ChangeIndividualInterest(-0.3f, INTERESTCATEGORY_HARVEST);
    INT_ChangeIndividualInterest(0.2f, INTERESTCATEGORY_RECON);
    INT_ChangeIndividualInterest(0.05f, INTERESTCATEGORY_BUILDING);
    if (CP_IsXVIStarted())
        INT_ChangeIndividualInterest(0.1f, INTERESTCATEGORY_XVI);

    CP_MissionRemove(mission);
}

void CP_HarvestMissionIsFailure (mission_t* mission)
{
    INT_ChangeIndividualInterest(0.1f, INTERESTCATEGORY_INTERCEPT);
    INT_ChangeIndividualInterest(0.03f, INTERESTCATEGORY_BASE_ATTACK);
    INT_ChangeIndividualInterest(0.03f, INTERESTCATEGORY_TERROR_ATTACK);

    CP_MissionRemove(mission);
}

static void CP_HarvestMissionStart (mission_t* mission)
{
    const date_t minMissionDelay = {2, 0};
    const date_t missionDelay = {3, 0};

    mission->stage = STAGE_HARVEST;

    if (mission->ufo) {
        mission->finalDate = Date_Add(ccs.date, Date_Random(minMissionDelay, missionDelay));
        /* ufo becomes invisible on geoscape, but don't remove it from ufo global array (may reappear)*/
        CP_UFORemoveFromGeoscape(mission, false);
    } else {
        /* Go to next stage on next frame */
        mission->finalDate = ccs.date;
    }

    /* mission appear on geoscape, player can go there */
    CP_MissionAddToGeoscape(mission, false);
}

static bool CP_ChooseNation (const mission_t* mission, linkedList_t** nationList)
{
    int randomNumber, max = 0;
    /* Increase this factor to make probability to select non-infected nation higher
     * Used to make sure that non-infected nation can still be attacked */
    const int OFFSET = 1;

    if (mission->ufo)
        return false;

    /* favour mission with higher XVI level */
    NAT_Foreach(nation) {
        const nationInfo_t* stats = NAT_GetCurrentMonthInfo(nation);
        max += OFFSET + stats->xviInfection;
    }

    randomNumber = (int) (frand() * (float) max);

    /* Select the corresponding nation */
    NAT_Foreach(nation) {
        const nationInfo_t* stats = NAT_GetCurrentMonthInfo(nation);
        randomNumber -= OFFSET + stats->xviInfection;
        if (randomNumber < 0) {
            cgi->LIST_AddString(nationList, nation->id);
            return true;
        }
    }

    return false;
}

void CP_HarvestMissionGo (mission_t* mission)
{
    mission->stage = STAGE_MISSION_GOTO;

    /* Choose a map */
    if (CP_ChooseMap(mission, nullptr)) {
        int counter;
        linkedList_t* nationList = nullptr;
        const bool nationTest = CP_ChooseNation(mission, &nationList);
        for (counter = 0; counter < MAX_POS_LOOP; counter++) {
            if (!CP_GetRandomPosOnGeoscapeWithParameters(mission->pos, mission->mapDef->terrains, mission->mapDef->cultures, mission->mapDef->populations, nationTest ? nationList : nullptr))
                continue;
            if (GEO_PositionCloseToBase(mission->pos))
                continue;
            mission->posAssigned = true;
            break;
        }
        if (counter >= MAX_POS_LOOP) {
            cgi->Com_Printf("CP_HarvestMissionGo: Error, could not set position.\n");
            CP_MissionRemove(mission);
            return;
        }
        cgi->LIST_Delete(&nationList);
    } else {
        cgi->Com_Printf("CP_HarvestMissionGo: 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;
    }
}

void CP_HarvestMissionNextStage (mission_t* mission)
{
    switch (mission->stage) {
    case STAGE_NOT_ACTIVE:
        /* Create Harvesting mission */
        CP_MissionBegin(mission);
        break;
    case STAGE_COME_FROM_ORBIT:
        /* Go to mission */
        CP_HarvestMissionGo(mission);
        break;
    case STAGE_MISSION_GOTO:
        /* just arrived on a new Harvesting mission: start it */
        CP_HarvestMissionStart(mission);
        break;
    case STAGE_HARVEST:
        /* Leave earth */
        CP_ReconMissionLeave(mission);
        break;
    case STAGE_RETURN_TO_ORBIT:
        /* mission is over, remove mission */
        CP_HarvestMissionIsSuccess(mission);
        break;
    default:
        cgi->Com_Printf("CP_HarvestMissionNextStage: Unknown stage: %i, removing mission.\n", mission->stage);
        CP_MissionRemove(mission);
        break;
    }
}