bworld/server/game/blocks.ts

import { Container, ItemStack } from "$/common/inventory.ts";
import { ScreenLayout } from "$/common/protocol.ts";
import { EverythingRegistry, ItemRegistry } from "$/common/everything_registry.ts";
import type { RecipeBook } from "$/common/mod_loader.ts";
import type { GameServer } from "./game_server.ts";
import type { ServerPlayer } from "./player.ts";
import type { Tile } from "./world.ts";

// what blocks do, only on the server. blocks without an entry just sit there
export interface BlockBehavior {
	// set up a tile for this block. blocks with this get a tile when placed
	create_tile?(tile: Tile): void;
	// right click, return true if it did something so no block gets placed
	on_interact?(
		game: GameServer,
		block: { x: number; y: number; z: number; id: string },
		player: ServerPlayer,
	): boolean;
	on_break?(game: GameServer, tile: Tile, player: ServerPlayer | undefined): void;
	on_tick?(game: GameServer, tile: Tile): void;
	on_second?(game: GameServer, tile: Tile): void;
}

export const BLOCK_BEHAVIORS: Record<string, BlockBehavior> = {};

// whatever was inside falls out, like minecraft's Containers.dropContents
function drop_container_contents(game: GameServer, tile: Tile) {
	for (const container of Object.values(tile.containers)) {
		for (let i = 0; i < container.size; i++) {
			const item = container.get_item(i);
			if (item) {
				container.set_item(i, undefined);
				game.pop_item(tile.x, tile.y, tile.z, item);
			}
		}
	}
}

function hoe_into_hoed_dirt(
	game: GameServer,
	block: { x: number; y: number; z: number },
	player: ServerPlayer,
): boolean {
	if (player.held_item?.type_id !== "bworld:hoe") {
		return false;
	}
	game.set_block(block.x, block.y, block.z, "bworld:hoed_dirt", player);
	return true;
}

BLOCK_BEHAVIORS["bworld:grass"] = { on_interact: hoe_into_hoed_dirt };
BLOCK_BEHAVIORS["bworld:dirt"] = { on_interact: hoe_into_hoed_dirt };

// chest

const CHEST_LAYOUT: ScreenLayout = {
	rows: 3,
	slots: Array.from({ length: 9 * 3 }, (_, index) => ({ index, x: index % 9, y: Math.floor(index / 9) })),
	bars: [],
};

BLOCK_BEHAVIORS["bworld:chest"] = {
	create_tile(tile) {
		tile.containers.main = new Container(9 * 3);
	},
	on_interact(game, block, player) {
		const tile = game.get_or_create_tile(block.x, block.y, block.z);
		game.open_screen(player, {
			tile,
			container: tile.containers.main,
			layout: CHEST_LAYOUT,
			properties: () => ({}),
		});
		return true;
	},
	on_break(game, tile) {
		drop_container_contents(game, tile);
	},
};

// furnace

interface FurnaceData {
	progress: number;
	progress_max: number;
	fuel: number;
	fuel_max: number;
}

interface FurnaceRecipe {
	output: { id: string; count: number };
	cook_time: number;
}

function get_recipe(recipes: RecipeBook, input?: ItemStack | undefined): FurnaceRecipe | undefined {
	if (!input) {
		return;
	}

	return recipes.furnace.get(input.type_id);
}

function can_craft(container: Container, recipe?: FurnaceRecipe) {
	if (!recipe) {
		return false;
	}

	const output = container.get_item(2);

	if (!output) {
		return true;
	}

	if (output.type_id !== recipe.output.id) {
		return false;
	}

	return output.amount < output.max_amount;
}

function get_fuel_value(recipes: RecipeBook, item?: ItemStack | undefined): number {
	if (!item) {
		return 0;
	}
	return recipes.fuel.get(item.type_id) ?? 0;
}

function has_fuel(recipes: RecipeBook, container: Container) {
	return get_fuel_value(recipes, container.get_item(1)) > 0;
}

function consume_fuel(recipes: RecipeBook, container: Container): number {
	const fuel = container.get_slot(1)!;
	const value = get_fuel_value(recipes, fuel.get_item());

	if (fuel.has_item()) {
		fuel.amount! -= 1;
	}

	return value;
}

function craft(container: Container, recipe: FurnaceRecipe) {
	const input = container.get_item(0)!;
	const output = container.get_item(2);

	if (!output) {
		container.set_item(2, new ItemStack(recipe.output.id, recipe.output.count));
	} else {
		output.amount += recipe.output.count;
	}

	input.amount -= 1;
	container.set_item(0, input.amount > 0 ? input : undefined);
}

const FURNACE_LAYOUT: ScreenLayout = {
	rows: 3,
	slots: [
		{ index: 0, x: 3.5, y: 0 },
		{ index: 1, x: 3.5, y: 2 },
		{ index: 2, x: 5.5, y: 1, output: true },
	],
	bars: [
		{
			x: 3.5,
			y: 1,
			value: "fuel",
			max: "fuel_max",
			direction: "up",
			empty_texture: "bworld:fire_empty",
			full_texture: "bworld:fire_full",
		},
		{
			x: 4.5,
			y: 1,
			value: "progress",
			max: "progress_max",
			direction: "right",
			empty_texture: "bworld:arrow_empty",
			full_texture: "bworld:arrow_full",
		},
	],
};

BLOCK_BEHAVIORS["bworld:furnace"] = {
	create_tile(tile) {
		tile.containers.main = new Container(3);
		tile.data = { progress: 0, progress_max: 0, fuel: 0, fuel_max: 0 } satisfies FurnaceData;
	},
	on_interact(game, block, player) {
		const tile = game.get_or_create_tile(block.x, block.y, block.z);
		const data = tile.data as unknown as FurnaceData;
		game.open_screen(player, {
			tile,
			container: tile.containers.main,
			layout: FURNACE_LAYOUT,
			properties: () => ({ ...data }),
		});
		return true;
	},
	on_break(game, tile) {
		drop_container_contents(game, tile);
	},
	on_tick(game, tile) {
		const data = tile.data as unknown as FurnaceData;
		const container = tile.containers.main;

		const input = container.get_item(0);
		const recipe = get_recipe(game.recipes, input);

		// burn fuel
		if (data.fuel > 0) {
			data.fuel -= 1;
		}

		if (!can_craft(container, recipe)) {
			data.progress = 0;
			return;
		}

		// refuel
		if (data.fuel === 0 && has_fuel(game.recipes, container)) {
			data.fuel = consume_fuel(game.recipes, container);
			data.fuel_max = data.fuel;
		}

		// cook
		if (data.fuel > 0 && recipe) {
			data.progress_max = recipe.cook_time;
			data.progress += 1;

			if (data.progress >= recipe.cook_time) {
				data.progress = 0;
				craft(container, recipe);
			}
		}
	},
};

// items that still need code, until they're components in mods/bworld (phase 2 in MODS.md)

export interface WateringCanData {
	water: number;
	max_water: number;
}

export function add_base_item_hooks() {
	const watering_can = EverythingRegistry.get<ItemRegistry<WateringCanData>>("items", "bworld:watering_can");
	if (watering_can) {
		watering_can.on_create = (item) => {
			item.data = { water: 0, max_water: 32 };
		};
		watering_can.get_lore = (item) => `Water: ${item.data?.water}/${item.data?.max_water}`;
	}
}