#ifndef WORLD_HPP
#define WORLD_HPP

#include "luastack.hpp"
#include "planemap.hpp"
#include "idalloc.hpp"
#include "animqueue.hpp"
#include "source.hpp"
#include <memory>
#include <unordered_map>

class World;

class Tangible {
public:
    // Simple constructor initializes everything to null.
    //
    Tangible();

    // Always points back to the world model.
    World *world_;

    // Animation queue.
    //
    AnimQueue anim_queue_;

    // Plane Item.
    //
    // The PlaneItem also contains this tangible's ID.
    // To move this Tangible, update the anim_queue first, then update
    // this plane_item_ from the anim_queue.
    PlaneItem plane_item_;

    // Player ID pool
    //
    // Note: this is only allocated if this Tangible is a player.
    std::unique_ptr<IdPlayerPool> id_player_pool_;

    void be_a_player();
};

class World {
public:
    // A pointer to the lua State.
    //
    lua_State *lua_state_;

    // The Global ID Pool.
    //
    IdGlobalPool id_global_pool_;

    // Source Database.
    //
    SourceDB source_db_;
    PlaneMap plane_map_;
    std::unordered_map<int64_t, Tangible> tangibles_;

public:
    // Constructor.
    //
    // The constructor also calls 'lua_open' to create a new
    // lua interpreter for this world model.  The lua interpreter
    // is stored in world::lua_state_.  A significant amount of
    // initial setup is done by this constructor.
    //
    World();

    // Destructor.
    //
    // Not currently functional.
    //
    ~World();

    // Initialize for single-player mode.
    //
    void init_standalone();

    // get_lua_state
    //
    // Get the lua interpreter associated with this world model.
    //
    lua_State *get_lua_state() { return lua_state_; }

    // update_view_map
    //
    // Update the view map with information about all the tangibles near
    // the specified player.
    //
    void update_view_map(AnimViewMap *vm, int64_t player_id, float radius);
    
    // Make a tangible.
    //
    // If the ID is zero, allocates an ID using the thread's ID allocator. If
    // pushdb is true, pushes the tangible's database onto the lua stack.
    // Otherwise, leaves the lua stack untouched.
    //
    Tangible *tangible_make(lua_State *L, int64_t id, bool pushdb);

    // Get a pointer to the specified tangible.
    //
    Tangible *tangible_get(int64_t id);
    
    // Delete a tangible with the specified ID.
    //
    // If the tangible doesn't exist, does nothing.
    //
    void tangible_del(int64_t id);

    // fetch
    //
    // Given a lua state, fetch the world model associated with
    // that lua state.
    //
    static World *fetch(lua_State *L);
};

#endif // WORLD_HPP