#pragma once

#include <vector>
#include <queue>

#include <iostream>

#include <glm/vec2.hpp>

namespace game {
    // forward declarations
    class Command;
    class Missile;
    class Player;
    class Planet;
    class Ship;
    class Trace;

    class State {
    public:
        /*************************************************************************/
        /* State management */
        /*************************************************************************/

        // called to setup the state (randomize planets, kill
        // traces/missiles/ships etc.)
        void init();

        // main method to advance the simulation by the given timestamp in
        // seconds.
        void advance(float dt);

        /*************************************************************************/
        /* Network / Input */
        /*************************************************************************/

        // The upper layer (network/renderer) calling these three functions
        // should keep id's unique and give one (network) input an id.
        int addPlayer();
        void playerLeft(int playerId);
        void commandForPlayer(int playerId, Command *cmd);

        // lookup. return nullptr on invalid playerId
        Player *playerForId(int playerId);

        /*************************************************************************/
        /* Mixed stuff */

        // distance after which missiles get lost in space (and explode)
        float maxMissileDistance() const { return m_maxMissileDistance; }

        // each ship has the same radius
        float shipRadius()         const { return m_shipRadius; }

        // add a trace to the list of traces.
        void addTrace(Trace *trace);

        /*************************************************************************/
        /* Rendering */
        /*************************************************************************/

        // Game items which should be rendered are here:
        // (access missiles by iterating over player's missiles attribute)
        std::vector<Planet*>  planets;
        std::vector<Ship*>    ships;
        std::vector<Player*>  players;
        std::vector<Trace*>   traces;

    private:
        /*************************************************************************/
        /* Internal */
        /*************************************************************************/

        void playerKillsPlayer(Player *killer, Player *victim);

        void advancePlayerShipSpawns(float dt);
        void advancePlayerCommands(float dt);
        void advancePlayerMissiles(float dt);

        // try to spawn a ship for this player.
        // return true on success, false on failure to find a spot.
        bool spawnShipForPlayer(Player *player);

        // find some place where nothing is placed nearby (ships/planets).
        // usefule for spanwing things
        bool findFreePositionWithRadius(float r, glm::vec2 &pos);

        float m_maxMissileDistance;
        float m_playerRespawnTime;
        float m_shipRadius;
        float m_defaultEnergy;
        int m_nextId=0;
    };
};