/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    All Rights Reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    * Neither the name "Destroyer Studios" nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.

    SUBSYSTEM:    Stars.exe
    FILE:         System.cpp
    AUTHOR:       John DiCamillo


    OVERVIEW
    ========
    Generic Ship Subsystem class
*/

#include "MemDebug.h"
#include "System.h"
#include "SystemDesign.h"
#include "Component.h"
#include "NetUtil.h"

#include "Game.h"

// +----------------------------------------------------------------------+

System::System(System::CATEGORY t, int s, const char* n, int maxv,
double e, double c, double r)
: type(t), id(0), ship(0), subtype(s), status(NOMINAL), availability(1.0f),
safety(1.0f), stability(1.0f), crit_level(0.5f), net_avail(-1.0f),
mount_rel(0.0f, 0.0f, 0.0f), radius(0.0f), safety_overload(0.0f),
hull_factor(0.5f), energy((float) e), capacity((float) c), sink_rate((float) r),
power_level(1.0f), power_flags(0), source_index(0), power_on(true),
explosion_type(0), name(n), abrv(name), design(0), emcon(3)
{
    if (maxv < 100)
    max_value = maxv;
    else
    max_value = (int) (maxv/100.0);

    emcon_power[0] = 100;
    emcon_power[1] = 100;
    emcon_power[2] = 100;
}

// +----------------------------------------------------------------------+

System::System(const System& s)
: type(s.type), id(s.id), ship(0), subtype(s.subtype), status(s.status),
availability(s.availability), safety(s.safety), stability(s.stability),
crit_level(s.crit_level), net_avail(-1.0f),
mount_rel(s.mount_rel), radius(s.radius), safety_overload(0.0f),
hull_factor(s.hull_factor), energy(s.energy), capacity(s.capacity),
sink_rate(s.sink_rate),  power_level(s.power_level), power_flags(s.power_flags),
source_index(s.source_index), power_on(s.power_on), max_value(s.max_value),
explosion_type(s.explosion_type), name(s.name), abrv(s.abrv), design(s.design),
emcon(s.emcon)
{
    if (design) {
        // cast-away const
        ListIter<Component> c = (List<Component>&) s.components;
        while (++c) {
            Component* comp = new(__FILE__,__LINE__) Component(*(c.value()));
            comp->SetSystem(this);
            components.append(comp);
        }
    }

    emcon_power[0] = s.emcon_power[0];
    emcon_power[1] = s.emcon_power[1];
    emcon_power[2] = s.emcon_power[2];
}

// +--------------------------------------------------------------------+

System::~System()
{
    components.destroy();
}

// +--------------------------------------------------------------------+

void
System::SetDesign(SystemDesign* d)
{
    if (design) {
        design = 0;
        components.destroy();
    }

    if (d) {
        design = d;

        ListIter<ComponentDesign> cd = design->components;
        while (++cd) {
            Component* comp = new(__FILE__,__LINE__) Component(cd.value(), this);
            components.append(comp);
        }
    }
}

// +--------------------------------------------------------------------+

void
System::SetPowerLevel(double level)
{
    if (level > 100)
    level = 100;
    else if (level < 0)
    level = 0;

    level /= 100;

    if (power_level != level) {
        // if the system is on emergency override power,
        // do not let the EMCON system use this method
        // to drop it back to normal power:
        if (power_level > 1 && level == 1)
        return;

        power_level = (float) level;

        NetUtil::SendSysStatus(ship, this);
    }
}

void
System::SetOverride(bool over)
{
    bool changed = false;

    if (over && power_level != 1.2f) {
        power_level = 1.2f;
        changed = true;
    }

    else if (!over && power_level > 1) {
        power_level = 1.0f;
        changed = true;
    }

    if (changed)
    NetUtil::SendSysStatus(ship, this);
}

void
System::SetEMCONPower(int index, int power_level)
{
    if (index >= 1 && index <= 3) {
        emcon_power[index-1] = (BYTE) power_level;
    }
}

int
System::GetEMCONPower(int index)
{
    if (index >= 1 && index <= 3) {
        return emcon_power[index-1];
    }

    return 100;
}

void
System::DoEMCON(int index)
{
    int e = GetEMCONPower(index);

    if (power_level * 100 > e || emcon != index) {
        if (e == 0) {
            PowerOff();
        }
        else {
            if (emcon != index)
            PowerOn();

            SetPowerLevel(e);
        }
    }

    emcon = index;
}

// +--------------------------------------------------------------------+

void
System::ExecFrame(double seconds)
{
    if (seconds < 0.01)
    seconds = 0.01;

    STATUS s = DESTROYED;

    if (availability > 0.99)
    s = NOMINAL;
    else if (availability > crit_level)
    s = DEGRADED;
    else
    s = CRITICAL;

    bool repair = false;

    if (components.size() > 0) {
        ListIter<Component> comp = components;
        while (++comp) {
            if (comp->Status() > Component::NOMINAL) {
                repair = true;
                break;
            }
        }
    }

    if (repair) {
        Repair();
    }

    else {
        if (status != s) {
            status = s;
            NetUtil::SendSysStatus(ship, this);
        }

        // collateral damage due to unsafe operation:
        if (power_on && power_level > safety) {
            safety_overload += (float) seconds;

            // inflict some damage now:
            if (safety_overload > 60) {
                safety_overload -= (float) (rand() / (1000 * (power_level-safety)));
                ApplyDamage(15);

                NetUtil::SendSysStatus(ship, this);
            }
        }

        else if (safety_overload > 0) {
            safety_overload -= (float) seconds;
        }
    }
}

void
System::Repair()
{
    if (status != MAINT) {
        status = MAINT;
        safety_overload = 0.0f;

        NetUtil::SendSysStatus(ship, this);
    }
}

// +--------------------------------------------------------------------+

void
System::ExecMaintFrame(double seconds)
{
    if (components.size() > 0) {
        ListIter<Component> comp = components;
        while (++comp) {
            if (comp->Status() > Component::NOMINAL) {
                comp->ExecMaintFrame(seconds);
            }
        }
    }
}

// +--------------------------------------------------------------------+

void
System::ApplyDamage(double damage)
{
    if (!power_on)
    damage /= 10;

    if (components.size() > 0) {
        int index = rand() % components.size();

        if (damage > 50) {
            damage/=2;
            components[index]->ApplyDamage(damage);

            index = rand() % components.size();
        }

        components[index]->ApplyDamage(damage);

        if (safety < 0.5)
        SetPowerLevel(50);

        else if (safety < 1.0)
        SetPowerLevel(safety * 100);
    }
    else {
        availability -= (float) (damage/100.0f);
        if (availability < 0.01) availability = 0.0f;
    }
}

void
System::CalcStatus()
{
    if (components.size() > 0) {
        availability = 1.0f;
        safety       = 1.0f;
        stability    = 1.0f;

        ListIter<Component> comp = components;
        while (++comp) {
            if (comp->DamageEfficiency())
            availability *= comp->Availability() / 100.0f;

            if (comp->DamageSafety())
            safety       *= comp->Availability() / 100.0f;

            if (comp->DamageStability())
            stability    *= comp->Availability() / 100.0f;

            if (comp->IsJerried()) {
                safety       *= 0.95f;
                stability    *= 0.95f;
            }
        }

        if (net_avail >= 0 && availability < net_avail)
        availability = net_avail;
    }
}

// +--------------------------------------------------------------------+

void
System::Mount(Point loc, float rad, float hull)
{
    mount_rel   = loc;
    radius      = rad;
    hull_factor = hull;
}

void
System::Mount(const System& system)
{
    mount_rel   = system.mount_rel;
    radius      = system.radius;
    hull_factor = system.hull_factor;
}

// +--------------------------------------------------------------------+

void
System::Orient(const Physical* rep)
{
    const Matrix& orientation = rep->Cam().Orientation();
    Point         loc         = rep->Location();

    mount_loc = (mount_rel * orientation) + loc;
}

// +----------------------------------------------------------------------+

double
System::GetRequest(double seconds) const
{
    if (!power_on || capacity == energy)
    return 0;

    else
    return power_level * sink_rate * seconds;
}

// +----------------------------------------------------------------------+

void
System::Distribute(double delivered_energy, double seconds)
{
    if (UsesWatts()) {
        if (seconds < 0.01)
        seconds = 0.01;

        // convert Joules to Watts:
        energy = (float) (delivered_energy/seconds);
    }

    else if (!Game::Paused()) {
        energy += (float) delivered_energy;

        if (energy > capacity)
        energy = capacity;

        else if (energy < 0)
        energy = 0.0f;
    }
}

// +----------------------------------------------------------------------+

void
System::DrainPower(double to_level)
{
    energy = 0.0f;
}