#if defined(__clang__)
#pragma once
#include "feely_pona_unity.h"
#endif

enum TELY_EntityFlag
{
    TELY_EntityFlag_Clickable                           = 1 << 0,
    TELY_EntityFlag_MoveByKeyboard                      = 1 << 1,
    TELY_EntityFlag_MoveByMouse                         = 1 << 2,
    TELY_EntityFlag_DrawHitBox                          = 1 << 3,
    TELY_EntityFlag_DeriveHitBoxFromChildrenBoundingBox = 1 << 4,
};

enum TELY_GameShapeType
{
    TELY_GameShapeType_None,
    TELY_GameShapeType_Circle,
    TELY_GameShapeType_Rect,
    TELY_GameShapeType_Line,
};

struct TELY_GameShape
{
    TELY_GameShapeType   type;
    Dqn_V2               p1;
    Dqn_V2               p2;
    Dqn_V4               colour;
    Dqn_f32              line_thickness;
    Dqn_f32              circle_radius;
    TELY_RenderShapeMode render_mode;
};

const uint64_t TELY_GAME_ENTITY_HANDLE_GENERATION_MASK   = 0xFFFF'0000'0000'0000;
const uint64_t TELY_GAME_ENTITY_HANDLE_GENERATION_RSHIFT = 48;
const uint64_t TELY_GAME_ENTITY_HANDLE_GENERATION_MAX    = TELY_GAME_ENTITY_HANDLE_GENERATION_MASK >> TELY_GAME_ENTITY_HANDLE_GENERATION_RSHIFT;

const uint64_t TELY_GAME_ENTITY_HANDLE_INDEX_MASK        = 0x0000'FFFF'FFFF'FFFF;
const uint64_t TELY_GAME_ENTITY_HANDLE_INDEX_MAX         = TELY_GAME_ENTITY_HANDLE_INDEX_MASK - 1;
struct TELY_GameEntityHandle
{
    uint64_t id;
};

enum TELY_GameEntityState
{
    TELY_GameEntityState_Nil,
    TELY_GameEntityState_Idle,
    TELY_GameEntityState_Attack,
    TELY_GameEntityState_Run,
};

struct TELY_GameEntityAnimation
{
    uint16_t index;
    uint16_t frame;
    uint16_t ticks;
    uint16_t ticks_per_frame;
};

struct TELY_GameWaypoint
{
    Dqn_V2I            pos;
    TELY_GameWaypoint *next;
    TELY_GameWaypoint *prev;
};

struct TELY_GameEntity
{
    Dqn_String8                           name;
    TELY_GameEntityHandle                 handle;
    TELY_AssetSpriteSheet                *sprite_sheet;
    Dqn_Slice<TELY_AssetSpriteAnimation>  sprite_anims;
    Dqn_V2                                size_scale;
    TELY_GameEntityAnimation              anim;
    TELY_GameEntityState                  state;
    Dqn_V2                                velocity;

    TELY_GameEntityHandle                 stalk_entity;
    Dqn_V2I                               stalk_entity_last_known_tile;
    TELY_GameWaypoint                    *waypoints;

    // NOTE: The entity hit box is positioned at the center of the entity.
    Dqn_V2                                local_hit_box_size;
    Dqn_V2                                local_hit_box_offset;

    Dqn_V2                                attack_box_size;
    Dqn_V2                                attack_box_offset;

    uint64_t                              flags;
    bool                                  facing_left;
    Dqn_V2                                local_pos;
    Dqn_f64                               alive_time_s;
    Dqn_FArray<TELY_GameShape, 4>         shapes;
    TELY_GameEntity                      *next;
    TELY_GameEntity                      *prev;
    TELY_GameEntity                      *first_child;
    TELY_GameEntity                      *last_child;
    TELY_GameEntity                      *parent;
};

struct TELY_GameEntityIterator
{
    bool             init;
    Dqn_usize        iteration_count;

    TELY_GameEntity *entity;
    TELY_GameEntity *last_visited;

    TELY_GameEntity *entity_parent;
    TELY_GameEntity *entity_next;
    TELY_GameEntity *entity_first_child;
};

struct TELY_FreyaGameMath
{
    TELY_GameEntityHandle lec01_group_box;
    TELY_GameEntityHandle lec01_axis;
    TELY_GameEntityHandle lec01_point_a;
    TELY_GameEntityHandle lec01_point_b;

    TELY_GameEntityHandle lec01_task01_group_box;
    TELY_GameEntityHandle lec01_task01_radial_trigger;
    Dqn_f32               lec01_task01_radial_trigger_radius;
    TELY_GameEntityHandle lec01_task01_player;

    TELY_GameEntityHandle lec01_task02_group_box;
    TELY_GameEntityHandle lec01_task02_ray_begin;
    TELY_GameEntityHandle lec01_task02_ray_end;
    TELY_GameEntityHandle lec01_task02_surface;
};

struct TELY_GameCamera
{
    Dqn_V2  world_pos;
    Dqn_f32 rotate_rads;
    Dqn_V2  scale;
};

struct TELY_Game
{
    TELY_Platform                        *platform;
    TELY_RFui                             rfui;
    TELY_UI                               ui;
    TELY_ChunkPool                        chunk_pool;
    TELY_AssetFontHandle                  inter_regular_font;
    TELY_AssetFontHandle                  inter_italic_font;
    TELY_AssetFontHandle                  jetbrains_mono_font;
    TELY_AssetAudioHandle                 test_audio;

    Dqn_Slice<TELY_AssetSpriteAnimation>  hero_sprite_anims;
    TELY_AssetSpriteSheet                 hero_sprite_sheet;

    Dqn_FArray<TELY_GameEntityHandle, 8>  parent_entity_stack;
    Dqn_VArray<TELY_GameEntity>           entities;
    TELY_GameEntity                      *root_entity;
    TELY_GameEntity                      *entity_free_list;

    TELY_GameEntityHandle                 clicked_entity;
    TELY_GameEntityHandle                 hot_entity;
    TELY_GameEntityHandle                 active_entity;

    TELY_GameEntityHandle                 prev_clicked_entity;
    TELY_GameEntityHandle                 prev_hot_entity;
    TELY_GameEntityHandle                 prev_active_entity;

    TELY_FreyaGameMath                    freya_game_math;

    TELY_GameCamera                       camera;

};