View source for Module:Item recipe

-- Contains utilities for working with in-game item recipes.

-- todo: material sorting. based on alphabetical sorting? maybe at .json generation step, convert materials to an array?

local p = {} --p stands for package
local getArgs = require('Module:Arguments').getArgs
local itemModule = require('Module:Item')

-- An array of recipe groups.
-- Recipes are grouped by `method`.
-- Note that the order matters for perfomance - the recipe lookup happens from top to bottom.
local recipe_groups = {
	{ method = "autolathe", 	recipes = mw.loadJsonData("Module:Item recipe/recipes by lathe/autolathe.json") },
	-- { method = "protolathe", 	recipes = mw.loadJsonData("Module:Item recipe/recipes by lathe/protolathe.json") },
}

-- A table containing item recipes, identified by recipe IDs.
-- local recipes_by_recipe_id =

-- A table containing item recipe categories, identified by recipe category IDs.
-- local recipy_categories_by_recipe_category_id = mw.loadJsonData("Module:Item recipe/recipy categories by recipe category id.json")

-- ====================


local function numeric_table_length(t)
	local count = 0
	for _ in ipairs(t) do count = count + 1 end
	return count
end

local function table_length(t)
	local count = 0
	for _ in pairs(t) do count = count + 1 end
	return count
end

local function table_has_value(tab, val)
	for _, value in ipairs(tab) do
		if value == val then
			return true
		end
	end

	return false
end

local function assert_value_not_nil(value, error_message)
	if value == nil then
		if error_message == nil then
			error("value is nil")
		else
			error(error_message)
		end
	end
end

-- Given a value, checks if it's "nil". 
-- * If it's not - returns the `value`.
-- * IF it is - returns the `value_if_nil`.
local function nil_or(value, value_if_nil)
	if value == nil then
		return value_if_nil
	else
		return value
	end
end

-- ====================

-- Searches a recipe for a given item, optionally with a specific production method.
-- @returns A table with `method` and `recipe`, or `nil` if no recipe was found.
local function lookup_recipe_by_item_id(item_id, method)
	assert_value_not_nil(item_id, "failed to lookup recipes by method and item ID: item ID was not provided")

	-- production methods to lookup through
	local methods_to_lookup = {}
	if method == nil then
		-- no method specified = look through all methods until the recipe is found
		for _, recipe_group in ipairs(recipe_groups) do
			table.insert(methods_to_lookup, recipe_group.method)
		end
	else
		-- method specified = only look through recipes with that production method
		table.insert(methods_to_lookup, method)
	end

	for _, method in ipairs(methods_to_lookup) do
		for _, recipe in ipairs(recipe_groups[method].recipes) do
			if recipe.result == item_id then
				return {
					method = method,
					recipe = recipe
				}
			end
		end
	end
end

-- ====================

-- Generates an HTML element, containing recipe components used to produce given item with a given method.
-- Returns a DIV containg {{item}}s.
function generate_recipe_materials(frame)
	local args = getArgs(frame)

	local method = args[1]
	assert_value_not_nil(method, "failed to generate a recipe skeleton: method was not provided")
	local product = args[2]
	assert_value_not_nil(product, "failed to generate a recipe skeleton: product was not provided")

	local matching_recipes = lookup_recipes_by_method_and_item_id(method, product)
	local matching_recipes_len = numeric_table_length(matching_recipes)


end

function p.generate_item_recipe(frame)
	local args = getArgs(frame)
	
	-- Item name, alias or ID. Required.
	local item = args[1]

	-- Amount of item. Default is 1.
	-- Must be a string since Module:Item uses string amount. 
	-- All values from templates come as strings.
	local amount = nil_or(args[2], "1")
	
	-- Item production method. Can be "nil", in which case it's looked up.
	local method = nil
	
	assert_value_not_nil(item, "failed to generate a recipe for item: item was not provided")

	-- ============

	local current_frame = mw:getCurrentFrame()

	local item_id = itemModule.lookup_item_id_by_name_and_amount(item, amount)
	
	local recipe_lookup_result = lookup_recipe_by_item_id(item_id, method)
	assert_value_not_nil(recipe_lookup_result, "failed to generate a recipe for item: no recipe found for item " .. item_id .. " (method: " .. method ..")")

	local recipe = recipe_lookup_result.recipe
	local method = recipe_lookup_result.method

	
	local recipe_el = mw.html.create("div")
		:addClass("item-recipe")
		

	local product_el = mw.html.create("div")
		:addClass("item-recipe-product")

	recipe_el:node(current_frame:preprocess("{{item|" .. item_id .. "|" .. amount .. "}}"))

	recipe_el:node(product_el)
	

	local method_el = mw.html.create("div")
		:addClass("item-recipe-method")

	-- TODO: not all methods will be items, so this will eventually break.
	recipe_el:node(current_frame:preprocess("{{item|" .. method .. "}}"))

	recipe_el:node(method_el)


	local materials_el = mw.html.create("div")
		:addClass("item-recipe-materials")

	assert_value_not_nil(recipe_lookup_result.materials, "failed to generate a recipe for item: no 'materials' are specified for item " .. item_id .. " recipe (method: " .. method ..")")

	for material, cost in pairs(recipe_lookup_result.materials) do
		recipe_el:node(current_frame:preprocess("{{item|" .. material .. "|" .. (cost * amount) .. "}}"))
	end

	materials_el:node(materials_el)


	return recipe_el
		:allDone()

end

-- -- Generates a list of items needed for a recipe, along with exact amounts.
-- -- Needs a recipe ID passed as a single frame argument.
-- -- Uses {{Item}} to produce the items. Returns a div containing them.
-- function p.generate_recipe_items(frame)
-- 	local recipe_id = args[1]
-- 	assert_value_not_nil(recipe_id, "recipe ID was not provided")
-- end

return p
Description	What you type	What you get
Italic	''Italic text''	Italic text
Bold	'''Bold text'''	Bold text
Bold & italic	'''''Bold & italic text'''''	*Bold & italic text*