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

enum FP_GameEntityFlag
{
    FP_GameEntityFlag_Clickable                           = 1 << 0,
    FP_GameEntityFlag_MoveByKeyboard                      = 1 << 1,
    FP_GameEntityFlag_MoveByMouse                         = 1 << 2,
    FP_GameEntityFlag_MoveByGamepad                       = 1 << 3,
    FP_GameEntityFlag_DrawHitBox                          = 1 << 4,
    FP_GameEntityFlag_DeriveHitBoxFromChildrenBoundingBox = 1 << 5,
    FP_GameEntityFlag_NonTraversable                      = 1 << 6,
    FP_GameEntityFlag_MobSpawner                          = 1 << 7,
    FP_GameEntityFlag_MobSpawnerWaypoint                  = 1 << 8,
    FP_GameEntityFlag_AggrosWhenNearTerry                 = 1 << 9,
    FP_GameEntityFlag_Attackable                          = 1 << 9,
};

enum FP_GameShapeType
{
    FP_GameShapeType_None,
    FP_GameShapeType_Circle,
    FP_GameShapeType_Rect,
    FP_GameShapeType_Line,
};

struct FP_GameShape
{
    FP_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 FP_GAME_ENTITY_HANDLE_GENERATION_MASK   = 0xFFFF'0000'0000'0000;
const uint64_t FP_GAME_ENTITY_HANDLE_GENERATION_RSHIFT = 48;
const uint64_t FP_GAME_ENTITY_HANDLE_GENERATION_MAX    = FP_GAME_ENTITY_HANDLE_GENERATION_MASK >> FP_GAME_ENTITY_HANDLE_GENERATION_RSHIFT;

const uint64_t FP_GAME_ENTITY_HANDLE_INDEX_MASK        = 0x0000'FFFF'FFFF'FFFF;
const uint64_t FP_GAME_ENTITY_HANDLE_INDEX_MAX         = FP_GAME_ENTITY_HANDLE_INDEX_MASK - 1;
struct FP_GameEntityHandle
{
    uint64_t id;
};

enum FP_GameWaypointArrive
{
    // Considered arrived when within 1 meter of the target (`value` is ignored).
    FP_GameWaypointArrive_Default,

    // If set, we consider the entity as arriving at the waypoint when it's
    // distance to the target is:
    //
    // `arrived = dist <= (entity_hit_box_size * value)`
    //
    // A value of 0 for example means we are considered arrived when the entity
    // is positioned exactly on top of the target's position.
    FP_GameWaypointArrive_WhenWithinEntitySize,
};

struct FP_GameWaypoint
{
    FP_GameEntityHandle   entity;
    FP_GameWaypointArrive arrive;
    Dqn_f32               value;
};

struct FP_GameEntitySpawnList
{
    FP_GameEntityHandle     entity;
    FP_GameEntitySpawnList *next;
    FP_GameEntitySpawnList *prev;
};

struct FP_GameEntityActionSprite
{
    TELY_AssetSpriteSheet     *sheet;
    TELY_AssetSpriteAnimation *anim;
};

uint64_t const FP_GAME_ENTITY_ACTION_INFINITE_TIMER = UINT64_MAX;
struct FP_GameEntityAction
{
    uint32_t                 state;
    uint32_t                 next_state;
    TELY_AssetAnimatedSprite sprite;
    uint64_t                 started_at_clock_ms;
    uint64_t                 end_at_clock_ms;
};

enum FP_GameDirection
{
    FP_GameDirection_Up,
    FP_GameDirection_Down,
    FP_GameDirection_Left,
    FP_GameDirection_Right,
};

struct FP_GameRenderSprite
{
    Dqn_V2                   offset;
    TELY_AssetAnimatedSprite asset;
    bool                     loop;
    FP_Meters                height;
    uint64_t                 started_at_clock_ms;
};

struct FP_GameEntity
{
    FP_GameEntity                         *next;
    FP_GameEntity                         *prev;
    FP_GameEntity                         *first_child;
    FP_GameEntity                         *last_child;
    FP_GameEntity                         *parent;

    FP_EntityType                         type;
    Dqn_String8                           name;
    FP_GameEntityHandle                   handle;

    // The target size to render the sprite in meters. The width of the sprite
    // is scaled uniformly with respect to the height.
    FP_Meters                             sprite_height;
    FP_GameEntityAction                   action;
    Dqn_V2                                velocity;

    // Extra animations that are to be executed, but, don't affect the state
    // of the entity. For example, when Smoochie attacks, we have a heart
    // animation that is a seperate sprite that will play out.
    Dqn_FArray<FP_GameRenderSprite, 2>    extra_cosmetic_anims;

    FP_SentinelList<FP_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;
    bool                                  attack_processed; 

    Dqn_FArray<Dqn_V2, 8>                 spawner_waypoints;
    FP_SentinelList<FP_GameEntityHandle>  spawn_list;
    uint64_t                              next_spawn_timestamp_s;
    uint64_t                              spawn_cap;

    uint64_t                              flags;
    uint64_t                              hp;
    FP_GameDirection                      direction;
    Dqn_V2                                local_pos;
    Dqn_f64                               alive_time_s;
    Dqn_FArray<FP_GameShape, 4>           shapes;
};

struct FP_GameEntityIterator
{
    bool           init;
    Dqn_usize      iteration_count;

    FP_GameEntity *entity;
    FP_GameEntity *last_visited;

    FP_GameEntity *entity_parent;
    FP_GameEntity *entity_next;
    FP_GameEntity *entity_first_child;
};

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

struct FP_Game
{
    Dqn_f32                              delta_s_accumulator;
    uint16_t                             tile_size;
    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<FP_GameEntityHandle, 8>   parent_entity_stack;
    Dqn_VArray<FP_GameEntity>            entities;

    TELY_AssetSpriteSheet                 terry_sprite_sheet;
    TELY_AssetSpriteSheet                 smoochie_sprite_sheet;
    TELY_AssetSpriteSheet                 terry_merchant_sprite_sheet;

    FP_GameEntity                        *root_entity;
    FP_GameEntity                        *entity_free_list;

    FP_GameEntityHandle                   player;

    FP_GameEntityHandle                   clicked_entity;
    FP_GameEntityHandle                   hot_entity;
    FP_GameEntityHandle                   active_entity;
    FP_GameEntityHandle                   prev_clicked_entity;
    FP_GameEntityHandle                   prev_hot_entity;
    FP_GameEntityHandle                   prev_active_entity;

    FP_GameCamera                         camera;
    TELY_RFui                             rfui;

    Dqn_f32                               meters_to_pixels;
    uint64_t                              clock_ms;
    Dqn_PCG32                             rng;
};

struct FP_GameAStarNode
{
    Dqn_usize cost;
    Dqn_usize heuristic;
    Dqn_V2I   tile;
    Dqn_V2I   came_from;
    bool      non_traversable;
};