import { Container, ItemStack } from "$/common/inventory.ts";
import { CRAFTING_RESULT_SLOT } from "$/common/protocol.ts";
import type { GridRecipe } from "$/common/mod_data.ts";

// recipes come from mods, see RecipeBook in common/mod_loader.ts

function get_crafting_grid(crafting: Container): (string | undefined)[] {
	const grid: (string | undefined)[] = [];
	for (let i = 0; i < 9; i++) {
		grid.push(crafting.get_item(i)?.type_id);
	}
	return grid;
}

function matches_recipe(grid: (string | undefined)[], recipe: GridRecipe): boolean {
	for (let y = 0; y <= 3 - recipe.height; y++) {
		for (let x = 0; x <= 3 - recipe.width; x++) {
			let match = true;

			for (let gy = 0; gy < 3; gy++) {
				for (let gx = 0; gx < 3; gx++) {
					const grid_index = gy * 3 + gx;

					if (gx >= x && gx < x + recipe.width && gy >= y && gy < y + recipe.height) {
						const recipe_index = (gy - y) * recipe.width + (gx - x);
						if (grid[grid_index] !== recipe.pattern[recipe_index]) {
							match = false;
							break;
						}
					} else if (grid[grid_index] !== undefined) {
						match = false;
						break;
					}
				}
				if (!match) break;
			}

			if (match) return true;
		}
	}

	return false;
}

// puts what the grid makes in the result slot
export function update_crafting_result(crafting: Container, recipes: GridRecipe[]) {
	const grid = get_crafting_grid(crafting);
	const recipe = recipes.find((recipe) => matches_recipe(grid, recipe));
	crafting.set_item(CRAFTING_RESULT_SLOT, recipe ? new ItemStack(recipe.result.id, recipe.result.count) : undefined);
}

export function consume_recipe_items(crafting: Container) {
	for (let i = 0; i < 9; i++) {
		const slot = crafting.get_slot(i);
		if (slot.has_item()) {
			slot.amount = slot.amount! - 1;
		}
	}
}