Module:Item recipe

Module documentation
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Uses JSON data

This module uses JSON data pages:

• Module:Item recipe/recipes by recipe IDs.json
• Module:Item recipe/recipe IDs by product IDs.json
• Module:Item recipe/recipe IDs by method and availability.json
• Module:Item recipe/order of materials.json
• Module:Item recipe/product overrides.json

Implements {{item recipe}}.

JSON files

JSON files that are updated automatically, syncing with the upstream:

• Module:Item recipe/recipes by recipe IDs.json - contains 1 to 1 mapping of recipe IDs to recipes.
• Module:Item recipe/recipe IDs by product IDs.json - contains mapping of recipe products to recipe IDs that produce these...products. Can be 1 to 1, or 1 to many.
• Module:Item recipe/recipe IDs by method and availability.json - contains a mapping of recipe production methods (e.g. Autolathe) to → availability (condition under which a recipe is available for this production method) to → recipe IDs.

Warning

Do not make changes to the above JSON files - any changes made will be erased on next update.

JSON files that are filled manually:

• Module:Item recipe/order of materials.json - a 1 to 1 mapping of recipe materials to order at which they appear in recipes. Less number = higher order. Materials that do not have an order defined here, will appear after those that do.
• Module:Item recipe/product overrides.json - a 1 to 1 mapping of recipe products to item IDs. Not all products are the same as item IDs they "represent", so sometimes a connection needs to be established explicitly.

---

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

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

-- A table mapping recipe IDs to recipes.
local recipes_by_recipe_ids = mw.loadJsonData("Module:Item recipe/recipes by recipe IDs.json")

-- A table mapping product IDs to recipe IDs.
-- A product ID can have either a single recipe ID mapped to it, or multiple if there's are multiple recipes.
local recipe_ids_by_product_ids = mw.loadJsonData("Module:Item recipe/recipe IDs by product IDs.json")

-- A table mapping production methods to recipe IDs, with a intermediate mapping by availability.
local recipe_ids_by_method_and_availability = mw.loadJsonData(
    "Module:Item recipe/recipe IDs by method and availability.json")

-- A table mapping material IDs (item IDs) to their display order.
-- Order is just a number. Materials with lesser order number will appear first.
local materials_order_by_material_ids = mw.loadJsonData("Module:Item recipe/order of materials.json")

-- A table remapping product IDs.
--
-- Not all recipes produce products that you might think they do -
-- some produce their own "printed" or "empty" or other variants.
--
-- For instance, a recipe for the small power cell produces `PowerCellSmallPrinted` item,
-- whereas the actual power cell item has ID `PowerCellSmall`.
--
-- So, for the module functions to be able to find the recipe for the small power cell,
-- we first would need to define a mapping from the recipe product `PowerCellSmallPrinted`
-- to the actual item `PowerCellSmall`.
--
-- After that is done, a lookup for small power cell (or its id) will return the corresponding recipe.
local product_overrides = mw.loadJsonData("Module:Item recipe/product overrides.json")

local current_frame = mw:getCurrentFrame()

local methods_items_els_cache = {}

local was_template_styles_tag_el_added = false

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


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

    return false
end

local function filter_table(tab, predicate)
    local tab_filtered = {}
    for key, value in pairs(tab) do
        if predicate(key, value) then
            tab_filtered[key] = value
        end
    end

    return tab_filtered
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

local function find_first_numeric_table_item_matching_condition(table, condition)
    for i, item in ipairs(table) do
        if condition(item, i, table) then
            return item
        end
    end
end

local function find_first_table_item_matching_condition(table, condition)
    for key, value in pairs(table) do
        if condition(key, value, table) then
            return value
        end
    end
end

local function find_first_table_item_key_matching_condition(table, condition)
    for key, value in pairs(table) do
        if condition(key, value, table) then
            return key
        end
    end
end

local function map_numeric_table(tbl, f)
    local t = {}
    for i, v in ipairs(tbl) do
        t[i] = f(v, i)
    end
    return t
end
local function map_table(tbl, f)
    local t = {}
    for k, v in pairs(tbl) do
        t[k] = f(k, v)
    end
    return t
end

local function passthrough_assert_true(value, valueToReturnIfTrue, errorMessageOnFalse)
    if value then
        return valueToReturnIfTrue
    else
        error(errorMessageOnFalse)
    end
end



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

-- ######################
-- ### METHOD LOOKUPS ###
-- ######################

-- Lookups recipe IDs by production method `production_method`.
--
-- Returns recipe IDs grouped by availability.
--
-- Raises an error if no recipe IDs were found by the production method.
-- Set `no_error` to `true` to return `nil` instead.
function p.lookup_recipe_ids_with_availability_by_method(production_method, no_error)
    assert_value_not_nil(production_method)

    -- check for an exact match
    local exact_match = recipe_ids_by_method_and_availability[production_method]
    if exact_match ~= nil then
        return exact_match
    end

    -- check for case-independent match
    local production_method_lower = string.lower(production_method)

    for method, recipe_ids_grouped in pairs(recipe_ids_by_method_and_availability) do
        if string.lower(method) == production_method_lower then
            return recipe_ids_grouped
        end
    end

    if not no_error then
        error("recipe IDs by production method lookup failed: production method '" ..
            production_method .. "' is not defined")
    end
end

-- Lookups production methods by recipe ID `recipe_id`.
--
-- Returns an array of tables, each containg:
-- - `method` - production method.
-- - `availability` - availability for the recipe for this production method.
--
-- **NOTE:** This is an expensive function.
function p.lookup_methods_with_availability_by_recipe_id(inpit_recipe_id)
    local result = {}

    for method, recipe_ids_grouped in pairs(recipe_ids_by_method_and_availability) do
        for availability, recipe_ids in pairs(recipe_ids_grouped) do
            if numeric_table_has_value(recipe_ids, inpit_recipe_id) then
                table.insert(result, {
                    method = method,
                    availability = availability
                })
            end
        end
    end

    return result
end

-- Checks whether a production method `production_method` exists.
-- Any casing is allowed.
function p.method_exists(production_method)
    assert_value_not_nil(production_method)

    return p.lookup_recipe_ids_with_availability_by_method(production_method, true) ~= nil
end

-- Asserts that a production method `production_method` exists.
-- Any casing is allowed.
function p.assert_method_exists(production_method, custom_message)
    assert_value_not_nil(production_method)

    if not p.method_exists(production_method) then
        if custom_message then
            error("production method exists assertion failed for method '" ..
                production_method .. "': " .. custom_message)
        else
            error("production method exists assertion failed for method '" ..
                production_method .. "': production method is not defined")
        end
    end
end

-- ################################
-- ### PRODUCT OVERRIDE LOOKUPS ###
-- ################################

-- Lookups an override for product ID `product_id`.
--
-- For instance, if there was an override `PowerCellSmallPrinted` that maps to to item ID `PowerCellSmall`,
-- this functions would return `PowerCellSmall` if `product_id` was `PowerCellSmallPrinted`.
--
-- Raises an error if no match was found. Set `no_error` to `true` to return `nil` instead.
function p.lookup_product_id_override(product_id, no_error)
    assert_value_not_nil(product_id)

    return product_overrides[product_id]
        or passthrough_assert_true(
            no_error,
            nil,
            "product override lookup failed: no override was found with product ID '" ..
            product_id .. "'"
        )
end

-- Lookups the prodct ID that was overriden with item ID `item_id`.
--
-- For instance, if there was an override `PowerCellSmallPrinted` that maps to to item ID `PowerCellSmall`,
-- this functions would return `PowerCellSmallPrinted` if `item_id` was `PowerCellSmall`.
--
-- **NOTE:** This is an expensive function.
--
-- Raises an error if no match was found. Set `no_error` to `true` to return `nil` instead.
function p.reverse_lookup_product_id_override(item_id, no_error)
    assert_value_not_nil(item_id)

    return find_first_table_item_key_matching_condition(
            product_overrides,
            function(_, value) return value == item_id end
        )
        or passthrough_assert_true(
            no_error,
            nil,
            "reverse product override lookup failed: no override was found that maps to item ID '" ..
            item_id .. "'"
        )
end

-- #######################
-- ### PRODUCT LOOKUPS ###
-- #######################

-- Checks whether a an item `product` exists.
-- Takes into account that `product` can have a product override.
function p.product_exsits(product)
    assert_value_not_nil(product)

    local product_with_override = p.lookup_product_id_override(product, true)
        or product

    return itemModule.item_exists(product_with_override)
end

-- Asserts that a product `product` exists.
-- `product` can be a product ID (including overriden ones), item ID or name.
function p.assert_product_exists(product, custom_message)
    assert_value_not_nil(product)

    if not p.product_exsits(product) then
        if custom_message then
            error("product exist assertion failed for product '" .. product .. "': " .. custom_message)
        else
            error("product exist assertion failed for product '" ..
                product ..
                "': no product was found. Make sure that a recipe exists with given product or that a product override is defined in Module:Item recipe")
        end
    end
end

-- Lookups recipe IDs by product ID `product_id`.
-- Accepts overriden `product_id`s.
--
-- Returns an array of matches.
--
-- **NOTE:** This is an expensive function.
function p.lookup_recipe_ids_by_product_id(product_id)
    assert_value_not_nil(product_id)

    local result = recipe_ids_by_product_ids[
    p.reverse_lookup_product_id_override(product_id, true)
    or product_id
    ]

    -- always returns an array
    if type(result) == 'string' then
        return { result }
    else
        return result
    end
end

-- ######################
-- ### RECIPE LOOKUPS ###
-- ######################

-- Lookups recipe by recipe ID `recipe_id`.
--
-- Returns `nil` if no recipe was found.
-- Set `no_error` to `true` to return `nil` instead.
function p.lookup_recipe_by_recipe_id(recipe_id, no_error)
    assert_value_not_nil(recipe_id)

    return recipes_by_recipe_ids[recipe_id]
        or passthrough_assert_true(
            no_error,
            nil,
            "failed to lookup recipe by recipe id '" .. recipe_id .. "': no recipe was found"
        )
end

-- Asserts that a recipe ID `recipe_id` exists.
-- function assert_recipe_id_exists(recipe_id)
--     error("not impl")
-- end

-- Searches recipes by `query`. `query` can be an product ID (item ID - including overrden ones),
-- name or a recipe ID.
function p.search_recipes(query)
    assert_value_not_nil(query, "failed to lookup recipes by method and item ID: item ID was not provided")

    -- check if query is a recipe ID
    local match_recipe_by_recipe_id = recipes_by_recipe_ids[query]
    if match_recipe_by_recipe_id then
        -- if so - we got a direct match!
        return { match_recipe_by_recipe_id }
    end

    -- check if query is an item name/ID
    -- this is a last possibility.
    -- TODO add a custom errror here?
    local item_id = itemModule.lookup_item_id(query)

    local match_recipe_ids_by_product_id = p.lookup_recipe_ids_by_product_id(item_id)

    local recipes = {}
    if match_recipe_ids_by_product_id ~= nil then
        for _, recipe_id in ipairs(match_recipe_ids_by_product_id) do
            table.insert(recipes, p.lookup_recipe_by_recipe_id(recipe_id))
        end
    end

    return recipes
end

-- Lookups recipes by production method.
--
-- Raises an error if no recipes were found by the production method.
function p.lookup_recipes_by_production_method(method)
    assert_value_not_nil(method, "failed to lookup recipes by production method: no method was given")

    p.assert_method_exists(method,
        "failed to lookup recipes by production method: method '" .. method .. "' doesn't exist")

    local recipe_ids_grouped = p.lookup_recipe_ids_with_availability_by_method(method)

    local recipes = {}
    for availability, recipe_ids in pairs(recipe_ids_grouped) do
        for _, recipe_id in ipairs(recipe_ids) do
            local recipe = p.lookup_recipe_by_recipe_id(recipe_id)
            table.insert(recipes, recipe)
        end
    end

    return recipes
end

-- Filters given recipes by production method.
-- Any casing is allowed for production method.
-- function p.filter_recipes_by_production_method(recipes, production_method)
--     p.assert_method_exists(production_method)

--     return filter_table(
--         p.lookup_recipe_ids_by_method(production_method),
--         function(_, recipe_ids_grouped)
--             return find_first_numeric_table_item_matching_condition(
--                 recipes,
--                 function(recipe) return recipe.id == recipe_ids_grouped end
--             ) ~= nil
--         end
--     )
-- end

-- ##############################
-- ### MATERIAL ORDER LOOKUPS ###
-- ##############################

-- Searches a material item using the material order config, returning the order number or `nil`,
-- if the material order config doesn't have the queried item.
--
-- Takes in an item ID or name.
local function try_lookup_order_of_material(material)
    assert_value_not_nil(material, "failed to lookup order of material: material was not provided")

    local item_id = itemModule.lookup_item_id(material, true)

    if item_id == nil then
        error("failed to lookup order of material: material '" .. material .. "' does not exist")
    end

    return materials_order_by_material_ids[item_id]
end

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

-- Produces a "note" element used in generation of item recipes.
-- Takes in a CSS-compatible color and text content.
local function generate_note_element(color, text)
    local el = mw.html.create('span')
        :addClass("item-recipe-note")
        :node(text)

    if color then
        el:css('color', color)
    end

    return el
end

local function generate_info_icon(frame, kind)
    if kind == 'research' then
        return frame:expandTemplate {
            title = 'Tooltip',
            args = {
                "[[File:JobIconResearchDirector.png|24px|link=Research_and_Development#R&D_Tree]]",
                "This recipe is unlocked by '''research'''"
            }
        }
    elseif kind == 'emag' then
        return frame:expandTemplate {
            title = 'Tooltip',
            args = {
                "[[File:Emag.png|42px|link=Cryptographic Sequencer]]",
                "This recipe is unlocked by '''EMAG'''"
            }
        }
    elseif kind == 'progression-symbol' then
        return mw.html.create("span")
            :addClass('info-icon-progression-symbol')
            :node("↓")
    else
        error("failed to generate an info icon: unknown kind " .. kind)
    end
end

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

-- Generates a recipe element for a given item.
-- This is the main external function of this module.
function p.generate_item_recipe(frame)
    local args = getArgs(frame)

    -- [REQUIRED]

    -- Item name, alias, item ID or a recipe ID. Required.
    local input_query = args[1]
    assert_value_not_nil(input_query, "failed to generate a recipe for query: query was not provided")

    -- [OPTIONAL]

    -- Amount of item. Default is 1.
    -- Must be a string since Module:Item uses string amount.
    -- All values from templates come as strings.
    local input_amount = nil_or(args[2], "1")

    -- Item production method. Can be "nil", in which case it's looked up.
    local input_method = args[3]


    -- Whether to only generate a materials block.
    local input_materials_only = yesNo(args["materials only"] or args["mat only"] or false)

    -- Layout of materials in materials only mode.
    local input_materials_only_layout = args["materials only layout"] or args["mat only layout"] or "vertical"

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

    -- search recipes

    local recipes = p.search_recipes(input_query)
    local recipes_count = numeric_table_length(recipes)
    if recipes_count == 0 then
        error("failed to generate a recipe for item: no recipe was found for item '" ..
            input_query ..
            "' (input method: '" ..
            (input_method or "nil") ..
            "'). Make sure a recipe exists for this item or define a product override for an existing recipe in Module:Item recipe")
    elseif recipes_count > 1 then
        error("failed to generate a recipe for item: found multiple recipes for item '" ..
            input_query ..
            "' (input method: '" ..
            (input_method or "nil") ..
            "'). Rendering multiple recipes is currently unsupported")
    end

    local recipe = recipes[1]

    -- search recipe methods

    local recipe_methods_lookup = p.lookup_methods_with_availability_by_recipe_id(recipe.id)
    local recipe_methods_count = table_length(recipe_methods_lookup)
    if recipe_methods_count == 0 then
        error("failed to generate a recipe for item: no methods were found for recipe ID '" ..
            recipe.id ..
            "' (input query: '" .. input_query .. "'; input method: '" ..
            (input_method or "nil") ..
            "'). This shouldn't usually happen because the present recipes are bound to some production methods. Probable cause: bug in the recipe generation code")
    elseif recipe_methods_count > 1 and input_method == nil then
        local methods = map_numeric_table(
            recipe_methods_lookup,
            function(match)
                return match.method
            end
        )

        error("failed to generate a recipe for item: found multiple production methods for recipe ID '" ..
            recipe.id ..
            "' (input query: '" ..
            input_query ..
            "') and input production method was NOT specified. Rendering multiple recipes is unsupported, so please specify a production method from available methods for this recipe: '" ..
            table.concat(methods, "', '") .. "'")
    end

    local recipe_method
    local recipe_availability
    if input_method == nil then
        -- if no input methods is specified, use the single available recipe method
        recipe_method = recipe_methods_lookup[1].method
        recipe_availability = recipe_methods_lookup[1].availability
    else
        -- otherwise, the number of available methods can vary,
        -- so filter it down to a single one based on the input method.

        -- todo maybe convert this to a function
        local input_method_lower = string.lower(input_method);

        local recipe_methods_lookup_match = find_first_numeric_table_item_matching_condition(
            recipe_methods_lookup,
            function(lookup_result)
                return string.lower(lookup_result.method) == input_method_lower
            end
        )

        if recipe_methods_lookup_match == nil then
            error("failed to generate a recipe for item: no production methods were found for recipe ID '" ..
                recipe.id ..
                "' (input query: '" ..
                input_query ..
                "') matching input method '" ..
                (input_method or "nil") ..
                "'. Make sure a recipe exists for this item with the specified production method or define a product override for an existing recipe with the specified production method in Module:Item recipe")
        end

        recipe_method = recipe_methods_lookup_match.method
        recipe_availability = recipe_methods_lookup_match.availability
    end

    -- extract products

    -- recipe product IDs mapped to amounts
    local recipe_products = {}
    if recipe.result then
        recipe_products[recipe.result] = 1
    elseif recipe.resultReagents then
        for product_id, amount in pairs(recipe.resultReagents) do
            recipe_products[product_id] = amount
        end
    else
        error("failed to generate a recipe for item: no products were found for recipe ID '" ..
            recipe.id ..
            "' (input query: '" ..
            input_query ..
            "'). This might be due to recipe having another way to describe products")
    end

    -- generate recipe element

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

    if input_materials_only_layout == "vertical" or input_materials_only_layout == "ver" then
        recipe_el:addClass("item-recipe-materials-layout-vertical")
    else
        recipe_el:addClass("item-recipe-materials-layout-horizontal")
    end


    local body_el = mw.html.create("div")
        :addClass('item-recipe-body')
        :css('background', 'linear-gradient(135deg, var(--bg-color-light-x2), var(--bg-color-light))')


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

    assert_value_not_nil(recipe.materials,
        "failed to generate a recipe for item: no 'materials' are specified for recipe ID '" ..
        recipe.id .. "' (input query: '" ..
        input_query ..
        "')")

    -- copy list of materials, but without costs
    local materials = {}
    for material, cost in pairs(recipe.materials) do
        table.insert(materials, material)
    end

    -- sort materials list based on material order config.
    -- materials not in config will come after the ordered materials.
    table.sort(materials, function(first, second)
        return (try_lookup_order_of_material(first) or 999999999999)
            < (try_lookup_order_of_material(second) or 999999999999)
    end)

    -- generate materials elements in sorted order
    for _, material in ipairs(materials) do
        local cost = recipe.materials[material]

        local material_item_id = itemModule.lookup_item_id(material, true)
        if material_item_id == nil then
            error("failed to generate a recipe for item: material '" ..
                material ..
                "' was not found in item registry (for recipe ID '" ..
                recipe.id .. "'; input query: '" ..
                input_query ..
                "'). Make sure that the material is added to the item name overrides in Module:Item")
        end

        materials_el:node(itemModule.generate_item{ material_item_id, cost })
    end

    body_el:node(materials_el)


    if input_materials_only then
        recipe_el:addClass("materials-only")

        recipe_el:node(body_el)
    else
        local header_el = mw.html.create("div")
            :addClass("item-recipe-header")
            :css('background', 'linear-gradient(120deg, var(--bg-color-light-x3), var(--bg-color-light-x2))')

        recipe_el:node(header_el)


        local product_and_method_container_el = mw.html.create("div")
            :addClass("item-recipe-product-and-method-container")

        header_el:node(product_and_method_container_el)


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

        product_and_method_container_el:node(products_el)


        for product_id, amount in pairs(recipe_products) do
            local product_el = itemModule.generate_item { [1] = product_id, [2] = amount * input_amount, cap = true }
                :addClass("item-recipe-product")

            products_el:node(product_el)
        end


        -- TODO: not all methods will be items, so this will eventually break.
        local method_el = methods_items_els_cache[recipe_method]
        if method_el == nil then
            method_el = mw.html.create("span")
                :addClass('item-recipe-method')
                :node(itemModule.generate_item { [1] = recipe_method, capitalize = true })

            methods_items_els_cache[recipe_method] = method_el
        end

        product_and_method_container_el:node(method_el)


        local info_icons_el = mw.html.create("div")
            :addClass("item-recipe-info-icons")

        header_el:node(info_icons_el)


        recipe_el:node(body_el)


        local complete_time_el = mw.html.create("span")
            :addClass('item-recipe-complete-time')

        if recipe.completetime == 0 then
            complete_time_el:node("Instant")
        else
            complete_time_el:node((recipe.completetime * input_amount) .. " " .. "sec.")
        end


        body_el:node(complete_time_el)


        local notes_el = mw.html.create("div")
            :addClass("item-recipe-notes")
            :css('background', 'linear-gradient(40deg, var(--bg-color-light-x3), var(--bg-color-light-x2))')

        -- if recipe is not available by default,
        -- generate "info icons" and notes (if needed) telling about it.
        if recipe_availability ~= 'static' then
            local is_recipe_unlocked_by_research = string.find(recipe_availability, "dynamic", 1, true) ~= nil
            local is_recipe_unlocked_by_emag = string.find(recipe_availability, "emag", 1, true) ~= nil
            local is_recipe_unlocked_by_research_and_then_emag = is_recipe_unlocked_by_research and
                is_recipe_unlocked_by_emag

            if is_recipe_unlocked_by_research_and_then_emag then
                recipe_el:addClass('item-recipe-by-research')
                recipe_el:addClass('item-recipe-by-emag')

                info_icons_el:node(generate_info_icon(current_frame, 'research'))
                info_icons_el:node(generate_info_icon(current_frame, 'progression-symbol'))
                info_icons_el:node(generate_info_icon(current_frame, 'emag'))

                notes_el:node(
                    generate_note_element(
                        nil,
                        current_frame:preprocess(
                            "'''This recipe is unlocked by [[Cryptographic Sequencer|EMAG]] after it has been [[Research_and_Development#R&D_Tree|researched]]'''")
                    )
                )
            elseif is_recipe_unlocked_by_research then
                recipe_el:addClass('item-recipe-by-research')

                info_icons_el:node(generate_info_icon(current_frame, 'research'))

                -- if not is_recipe_unlocked_by_research_and_then_emag then
                -- 	notes_el:node(
                -- 		generate_note_element(
                -- 			"gold",
                -- 			"'''This recipe is unlocked by research'''"
                -- 		)
                -- 	)
                -- end
            else
                recipe_el:addClass('item-recipe-by-emag')

                info_icons_el:node(generate_info_icon(current_frame, 'emag'))

                -- if not is_recipe_unlocked_by_research_and_then_emag then
                -- 	notes_el:node(
                -- 		generate_note_element(
                -- 			"var(--danger-color)",
                -- 			current_frame:preprocess(
                -- 			"'''This recipe is unlocked by [[Cryptographic Sequencer|{{item|EmagUnlimited|l=EMAG}}]]'''")
                -- 		)
                -- 	)
                -- end
            end
        end

        recipe_el:node(notes_el)
    end


    if not was_template_styles_tag_el_added then
        recipe_el:node(current_frame:extensionTag("templatestyles", "", { src = 'Template:Item recipe/styles.css' }))

        was_template_styles_tag_el_added = true
    end

    return recipe_el
        :allDone()
end

-- Generates an alphabetical list of recipes (elements) for a given production method.
-- Used to list all recipes for a particular method.
-- Recipes are sorted based on their products (the items display names).
function p.generate_list_of_recipes_for_method(frame)
    local args = getArgs(frame)

    local method = args[1]
    assert_value_not_nil(method, "failed to generate a list of recipes for a method: method was not provided")

    -- Limit on how many recipes to generate
    local recipes_limit = tonumber(args.limit) or 99999999

    local recipes = p.lookup_recipes_by_production_method(method)
    assert_value_not_nil(recipes, "failed to generate a list of recipes for a method: unknown method: " .. method)

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

    local container_el = mw.html.create("div")
        :addClass("item-recipes-list")

    -- -- generate a list of products
    -- local products = {}
    -- local i = 1
    -- for product_item_id, _ in ipairs(recipes) do
    --     table.insert(products, product_item_id)

    --     if i == recipes_limit then
    --         break
    --     end

    --     i = i + 1
    -- end

    -- -- sort the list of products alphabetically
    -- -- by looking up the item names and comparing them
    -- table.sort(products, function(first, second)
    --     local first_item_id = p.lookup_product_id_override(first, true)
    --         or first
    --     local second_item_id = p.lookup_product_id_override(second, true)
    --         or second

    --     p.assert_product_exists(first_item_id)
    --     p.assert_product_exists(second_item_id)

    --     return itemModule.lookup_item_name_by_item_id(first_item_id)
    --         < itemModule.lookup_item_name_by_item_id(second_item_id)
    -- end)

    -- -- generate recipe elements
    -- for _, product in ipairs(products) do
    --     container_el:node(p.generate_item_recipe {
    --         [1] = p.lookup_product_id_override(product),
    --         [2] = 1,
    --         [3] = method
    --     })
    -- end

    -- generate recipe elements
    for _, recipe in ipairs(recipes) do
        container_el:node(
            p.generate_item_recipe {
                [1] = recipe.id,
                [2] = 1,
                [3] = method
            }
        )
    end

    return container_el
        :allDone()
end

return p