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#include "GameState.hh"

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#include "PhysicsWorld.hh"

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#include "Engine.hh"

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PhysicsWorld::PhysicsWorld (Vector gravity, Vector dimensions)

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    : Terrain(1337), tick_timer(PHYSICS_TICK_MS), tick_counter(0), dimensions(dimensions),

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      gravity(gravity) {

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    slots.connect(tick_timer.sig_timer(), this, &PhysicsWorld::tick);

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    tick_timer.enable();

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}

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void PhysicsWorld::addPlayerObject (PhysicsObject *object) {

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    players.push_back(object);

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}

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void PhysicsWorld::addProjectile (Shot *projectile) {

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    projectiles.push_back(projectile);

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}

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/**

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 * Function pointer used to clear the projectile list

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 * from those that have already been destroyd.

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 */

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bool isDestroyedProjectile (Shot* po) { return (*po).isDestroyed(); }

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void PhysicsWorld::tick () {

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    //    Engine::log(DEBUG, "physics.apply_force") << "*tick*";

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    for (std::list<PhysicsObject*>::iterator i = players.begin(); i != players.end(); i++) {

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        (*i)->tick(); 

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    }

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    for (std::list<Shot*>::iterator i = projectiles.begin(); i != projectiles.end(); i++) {

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        (*i)->tick();

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    }

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    // Delete destroyed projectiles

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    std::list<Shot*>::iterator new_end = remove_if(projectiles.begin(), projectiles.end(), isDestroyedProjectile);

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    projectiles.erase(new_end, projectiles.end());

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    tick_counter++;

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}

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uint32_t PhysicsWorld::getTick (void) {

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    return tick_counter;

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}

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void PhysicsWorld::draw(CL_GraphicContext *gc) {

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    Terrain::draw(gc);

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    // Draw players

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    for (std::list<PhysicsObject*>::iterator it = players.begin(); it != players.end(); it++) {

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        (*it)->draw(gc);

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    }

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    // Draw projectiles

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    for (std::list<Shot*>::iterator it = projectiles.begin(); it != projectiles.end(); it++) {

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        (*it)->draw(gc);

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    }

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}

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