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use std::collections::HashMap;

use blocks::BlockKind;

use crate::Game;

#[derive(Default)]

pub struct InteractableRegistry {

registry: HashMap<BlockKind, usize>,

}

impl InteractableRegistry {

/// Creates a new, empty [`InteractableRegistry`]

pub fn new() -> Self {

Self {

registry: HashMap::new(),

}

/// Registers that there is a handler that handles interactions

/// with the [`BlockKind`].

pub fn register(&mut self, block: BlockKind) {

let value = self.registry.get(&block).copied();

match value {

Some(count) => {

self.registry.insert(block, count + 1);

}

None => {

self.registry.insert(block, 1);

}

/// Deregisters a handler for a block interaction.

pub fn deregister(&mut self, block: BlockKind) {

let value = self.registry.get(&block).copied();

match value {

Some(count) => {

if count == 0 {

panic!(

"Tried to deregister an interaction handler on a block with 0 handlers."

);

} else {

self.registry.insert(block, count - 1);

}

None => {

panic!("Tried to deregister an interaction handler on a block with 0 handlers.")

}

pub fn is_registered(&self, block: BlockKind) -> bool {

self.registry.get(&block).is_some()

}

pub fn register(game: &mut Game) {

game.insert_resource(InteractableRegistry::default());

}

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