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use base::{EntityKind, Position};

use ecs::{EntityBuilder, EntityRef, SysResult};

use quill_common::{components::OnGround, entity_init::EntityInit};

use uuid::Uuid;

use crate::{Client, NetworkId};

/// Component that sends the spawn packet for an entity

/// using its components.

pub struct SpawnPacketSender(fn(&EntityRef, &Client) -> SysResult);

impl SpawnPacketSender {

pub fn send(&self, entity: &EntityRef, client: &Client) -> SysResult {

(self.0)(entity, client)

}

/// Stores the [`Position`] of an entity on

/// the previous tick. Used to determine

/// when to send movement updates.

#[derive(Copy, Clone, Debug)]

pub struct PreviousPosition(pub Position);

/// Stores the [`OnGround`] status of an entity on

/// the previous tick. Used to determine

/// what movement packet to send.

#[derive(Copy, Clone, Debug)]

pub struct PreviousOnGround(pub OnGround);

pub fn add_entity_components(builder: &mut EntityBuilder, init: &EntityInit) {

if !builder.has::<NetworkId>() {

builder.add(NetworkId::new());

}

// can't panic because this is only called after both position and onground is added to all entities.

// Position is added in the caller of this function and on_ground is added in the

// build default function. All entity builder functions call the build default function.

let prev_position = *builder.get::<Position>().unwrap();

let on_ground = *builder.get::<OnGround>().unwrap();

builder

.add(PreviousPosition(prev_position))

.add(PreviousOnGround(on_ground));

add_spawn_packet(builder, init);

}

fn add_spawn_packet(builder: &mut EntityBuilder, init: &EntityInit) {

// TODO: object entities spawned with Spawn Entity

// (minecarts, items, ...)

let spawn_packet = match init {

EntityInit::Player => spawn_player,

_ => spawn_living_entity,

};

builder.add(SpawnPacketSender(spawn_packet));

}

fn spawn_player(entity: &EntityRef, client: &Client) -> SysResult {

let network_id = *entity.get::<NetworkId>()?;

let uuid = *entity.get::<Uuid>()?;

let pos = *entity.get::<Position>()?;

client.send_player(network_id, uuid, pos);

Ok(())

}

fn spawn_living_entity(entity: &EntityRef, client: &Client) -> SysResult {

let network_id = *entity.get::<NetworkId>()?;

let uuid = *entity.get::<Uuid>()?;

let pos = *entity.get::<Position>()?;

let kind = *entity.get::<EntityKind>()?;

client.send_living_entity(network_id, uuid, pos, kind);

Ok(())

}

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