Module:Infobox television episode

This Lua module is used on many pages and changes may be widely noticed. Test changes in the module's /sandbox or /testcases subpages, or in your own module sandbox. Consider discussing changes on the talk page before implementing them.
This module depends on the following other modules:
Module:Infobox television episode is used to validate parameter values for Template:Infobox television episode and Template:Infobox television crossover episode.
Functions

above_title

{{#invoke:Infobox television episode|above_title}}
Returns the text used for the |above= field of the infobox.
episode_list

{{#invoke:Infobox television episode|episode_list}}
Returns the text used for the |episode_list= field of the infobox.
italic_title

{{#invoke:Infobox television episode|italic_title}}
Returns an {{Italic dab2}} instance if title qualifies. Also returns a maintenance category if conditions are met.
The article's title is italicized if the series name is included in the article's title disambiguation. No italicization happens if one of the following conditions is met:
|italic_title=no is set.
The article's title does not use disambiguation.
No |series= value is set.
The article's disambiguation is not equal or does not include the series name.
The page is added to a maintenance category if the title is italicized and there is already an {{Italic dab}}, {{Italic title}} or {{DISPLAYTITLE}} template.
Infobox parameters checked:
|series=
|italic_title=
validate_values

{{#invoke:Infobox television episode|validate_values}}
Returns the relevant maintenance categories based on the {{Infobox television episode}} values validated.
Infobox television crossover episode function

validate_values_crossover

{{#invoke:Infobox television episode|validate_values_crossover}}
Returns the relevant maintenance categories based on the {{Infobox television crossover episode}} values validated.
Maintenance categories

The module places relevant pages in the following maintenance categories:
--- @module
local p = {}

local maintenance_categories = {
	incorrectly_formatted = "[[Category:Pages using infobox television episode with incorrectly formatted values|%s]]",
	unlinked_values = "[[Category:Pages using infobox television episode with unlinked values|%s]]",
	image_values_without_an_image = "[[Category:Pages using infobox television episode with image-related values without an image]]",
	unnecessary_title_parameter = "[[Category:Pages using infobox television episode with unnecessary title parameter]]",
	non_matching_title = "[[Category:Pages using infobox television episode with non-matching title]]",
	flag_icon = "[[Category:Pages using infobox television with flag icon]]",
	dates_incorrectly_formatted = "[[Category:Pages using infobox television episode with nonstandard dates]]",
	manual_display_title = "[[Category:Pages using infobox television episode with unnecessary manual displaytitle]]",
	list_markup = "[[Category:Pages using infobox television episode with unnecessary list markup]]",
}

--- Returns the text after removing line breaks (<br> tags) and additional spaces as a result.
---
--- @param text string
--- @return string
local function get_name_with_br_fixes(text)
	local title, _ = string.gsub(text, "<br%s?/?>", "")
	title, _ = string.gsub(title, "  ", " ")
	return title
end

--- Returns the page name after replacing quotation marks for single quotes and fixing it to use the
--- "Space+single" and "Single+space" templates if a leading or trailing apostrophe or quotation mark is used.
---
--- Note: per [[MOS:QWQ]] an episode title with quotation marks should be replaced with single quotes.
---
--- @param frame table
--- @param article_title string
--- @return string
local function get_page_name_with_apostrophe_quotation_fixes(frame, article_title)
	local page_name, _ = string.gsub(article_title, '"', "'")

	local left_side_template = frame:expandTemplate{title = "Space+single"}
	local right_side_template = frame:expandTemplate{title = "Single+space"}
	page_name, _ = string.gsub(string.gsub(page_name, "^'", left_side_template), "'$", right_side_template)

	return page_name
end

--- Returns the series link.
---
--- @param series string
--- @return string
local function get_series_link(series)
	local delink = require("Module:Delink")._delink
	return delink({series, wikilinks = "target"})
end

--- Returns two strings:
---- The series name after de-linking it and escaping "-".
---- The series name after de-linking it.
---
--- @param series string
--- @return string, string
local function get_series_name(series)
	local delink = require("Module:Delink")._delink
	local series_name = delink({series})

	-- Escape the character "-" as it is needed for string.find() to work.
	local _
	local series_name_escaped, _ = string.gsub(series_name, "-", "%%-")
	return series_name_escaped, series_name
end

--- Returns a table consisting of the episode's title parts.
---
--- The return table's properties:
--- - title - The episode's title.
--- - disambiguation - the disambiguation text without parentheses.
---
--- Note: could potentially be moved to an outside module for other template and module uses.
---
--- @param text string
--- @return table<string, string | nil>
local function get_title_parts(text)
	local title, disambiguation = string.match(text, "^(.+) (%b())$")

	local titleString = title -- TODO: needed until https://github.com/Benjamin-Dobell/IntelliJ-Luanalysis/issues/63 is resolved.
	if not title or type(title) ~= "string" then
		titleString = text
	end

	---@type table<string, string | nil>
	local title_parts = {title = --[[---@not number | nil]] titleString, disambiguation = nil}

	if not disambiguation or type(disambiguation) ~= "string" then
		return title_parts
	end

	-- Remove outside parentheses from names which use parentheses as part of the name such as "episode (Randall and Hopkirk (Deceased))".
	disambiguation = string.sub(--[[---@not number | nil]] disambiguation, 2, -2)
	title_parts.disambiguation = --[[---@not number]] disambiguation
	return title_parts
end

--- Returns the title used in the {{Lowercase title}} template and an optional maintenance category.
---
--- @param page_text string
--- @param args table
--- @param title_parts table
--- @return string | nil
local function get_lowercase_template_status(page_text, args, title_parts)
	local lowercase_template =  string.match(page_text, "{{[Ll]owercase title.-}}")
	if lowercase_template then
		local lowercase_title, _ = string.gsub(title_parts.title,"^%u", string.lower)
		if args.title then
			if args.title == lowercase_title then
				return maintenance_categories.unnecessary_title_parameter
			else
				return maintenance_categories.non_matching_title
			end
			return ""
		end
		return lowercase_title
	end

	return nil
end

--- Returns the title used in the {{Correct title}} template and an optional maintenance category.
---
--- @param page_text string
--- @param args table
--- @param return_category boolean
--- @return string | nil
local function get_correct_title_value(page_text, args, return_category)
	local correct_title_template_pattern = "{{[Cc]orrect title|title=(.*)|reason=.-}}"

	local correct_title = string.match(page_text, correct_title_template_pattern)

	if not correct_title then
		correct_title_template_pattern = "{{[Cc]orrect title|(.*)|reason=.-}}"
		correct_title = string.match(page_text, correct_title_template_pattern)
	end

	if not correct_title and type(correct_title) ~= "string" then
		return nil
	end

	local correct_title_title_parts = get_title_parts(correct_title)

	if not correct_title_title_parts.disambiguation then
		-- If the correct title value has no disambiguation, check if the title used in the infobox is the same as the title used for the correct title value.
		if return_category and args.title then
			if args.title == correct_title_title_parts.title then
				return maintenance_categories.unnecessary_title_parameter
			else
				return maintenance_categories.non_matching_title
			end
		end
		return correct_title_title_parts.title
	end

	local series_name_escaped, _ = get_series_name(args.series)

	if series_name_escaped ~= "" and (correct_title_title_parts.disambiguation == series_name_escaped or string.find(correct_title_title_parts.disambiguation, series_name_escaped)) then
		if return_category and args.title then
			if args.title == correct_title_title_parts.title then
				return maintenance_categories.unnecessary_title_parameter
			else
				return maintenance_categories.non_matching_title
			end
		end
		return correct_title_title_parts.title
	end

	-- Can't determine if the text in parentheses is disambiguation or part of the title since |series= isn't used.
	if return_category then
		return ""
	end

	return correct_title
end

--- Returns the display title text used in either the {{DISPLAYTITLE}} or {{Italic title}} templates.
---
--- @param page_text string
--- @param article_title string
--- @return string | nil
local function get_display_title_text(page_text, article_title)
	local title_modification = string.match(page_text, "{{DISPLAYTITLE:(.-)}}")
	if title_modification and type(title_modification) == "string" then
		return --[[---@not number | nil]] title_modification
	end

	title_modification = string.match(page_text, "{{Italic title|string=(.-)}}")
	if title_modification and type(title_modification) == "string" then
		local italic_title_text, _ = string.gsub(article_title, --[[---@not number | nil]] title_modification, "''" .. title_modification .. "''")
		return italic_title_text
	end

	return nil
end

--- Returns a maintenance category if the italic_title value is not "no".
---
--- Infobox parameters checked:
--- - |italic_title=
---
--- @param args table
--- @return string
local function is_italic_title_valid_value(args)
	if args.italic_title and args.italic_title ~= "no" then
		return string.format(maintenance_categories.incorrectly_formatted, "italic_title")
	end
	return ""
end

--- Returns a maintenance category if the date is not formatted correctly with a {{Start date}} template.
---
--- Infobox parameters checked:
--- - |airdate=
--- - |released=
--- - |airdate_overall=
---
--- @param start_date string
--- @return string
local function are_dates_formatted_correctly(start_date)
	if start_date and not string.find(start_date, "dtstart") then
		return maintenance_categories.dates_incorrectly_formatted
	end
	return ""
end

--- Returns a maintenance category if list markup is used. The infobox can handle list markup correctly.
---
--- Note: the code here is temporarily checking only the parameters which have been converted
--- to use the plainlist class directly. Once current uses will be converted, the function will check all parameters
--- for incorrect usage.
---
--- Infobox parameters checked:
---	- Parameters listed below.
---
--- Currently checks for the following list markup:
--- - <br> tags - per [[MOS:NOBR]].
--- - <li> tags.
--- - "plainlist" class.
--- - "hlist" class.
---
--- @param args table
--- @return string
local function uses_list_markup(args)
	local invalid_tags = {
		["br"] = "<[bB][rR]%s?/?>",
		["li"] = "<li>",
		["plainlist"] = "plainlist",
		["hlist"] = "hlist",
	}

	---@type table<string, boolean>
	local parameters = {
		director = true,
		writer = true,
		story = true,
		teleplay = true,
		narrator = true,
		presenter = true,
		producer = true,
		music = true,
		photographer = true,
		editor = true,
		production = true,
		airdate = true,
		guests = true,
		commentary = true,
	}

	for parameter_name, _ in pairs(parameters) do
		for _, list_pattern in pairs(invalid_tags) do
			local parameter_value = args[parameter_name]
			if parameter_value and string.find(parameter_value, list_pattern) then
				return maintenance_categories.list_markup
			end
		end
	end
	return ""
end

--- Returns a maintenance category if a flag icon is used.
---
--- All of the infobox values are checked.
---
--- @param args table
--- @return string
local function has_flag_icon(args)
	for _, value in pairs(args) do
		if string.find(value, "flagicon") then
			return maintenance_categories.flag_icon
		end
	end
	return ""
end

--- Returns a maintenance category if the values are linked.
---
--- Infobox parameters checked:
--- - |episode=
--- - |season=
--- - |series_no=
--- - |episode_list=
---
--- The function currently checks if the following values are present:
--- - ]] - links.
---
--- @param args table
--- @return string
local function are_values_linked(args)
	local parameters = {
		episode = args.episode,
		season = args.season,
		series_no = args.series_no,
		episode_list = args.episode_list,
	}

	for key, value in pairs(parameters) do
		if string.find(value, "]]", 1, true) then
			return string.format(maintenance_categories.incorrectly_formatted, key)
		end
	end
	return ""
end

--- Returns a maintenance category if the values are formatted.
---
--- Most of the infobox values are checked. Not included are:
--- - |title= - is handled in is_infobox_title_equal_to_article_title()
--- - |series= - is handled in are_values_links_only()
--- - |next= - is handled in are_values_links_only()
--- - |prev= is handled in are_values_links_only()
--- - |rtitle=
--- - |rprev=
--- - |rnext=
--- - |image_alt=
--- - |alt=
--- - |caption=
--- - |based_on=
--- - |music=
--- - |guests=
---
--- The function currently checks if the following values are present:
--- - '' - italics or bold.
---
--- @param args table
--- @return string
local function are_values_formatted(args)
	---@type table<string, boolean>
	local ignore_parameters = {
		title = true,
		series = true,
		prev = true,
		next = true,
		rtitle = true,
		rprev = true,
		rnext = true,
		image_alt = true,
		alt = true,
		caption = true,
		based_on = true,
		music = true,
		guests = true,
	}

	for key, value in pairs(args) do
		if not ignore_parameters[key] and string.find(value, "''", 1, true) then
			return string.format(maintenance_categories.incorrectly_formatted, key)
		end
	end
	return ""
end

--- Returns a maintenance category if the values use additional overall numbering.
---
--- Infobox parameters checked:
--- - |episode=
--- - |season=
--- - |series_no=
---
--- The function currently checks if the following values are present:
--- - overall - unsupported series overall numbering.
---
--- @param args table
--- @return string
local function are_values_using_overall(args)
	local parameters = {
		episode = args.episode,
		season = args.season,
		series_no = args.series_no,
	}

	for key, value in pairs(parameters) do
		if string.find(value, "overall") then
			return string.format(maintenance_categories.incorrectly_formatted, key)
		end
	end

	return ""
end

--- Returns a maintenance category if the values are unlinked and if additional characters are found in the text.
---
--- Infobox parameters checked:
--- - |series=
--- - |prev=
--- - |next=
---
--- The function currently checks if a value is unlinked or if there is any additional character
--- before or after the linked text.
---
--- @param args table
--- @return string
local function are_values_links_only(args)
	local parameters = {
		series = args.series,
		prev = args.prev,
		next = args.next,
	}

	for key, value in pairs(parameters) do
		-- Check whether the values are linked.
		if not string.find(value, "%[%[.*%]%]") then
			return string.format(maintenance_categories.unlinked_values, key)
		end

		-- Check whether the values have anything before or after link brackets.
		if string.gsub(value, "(%[%[.*%]%])", "") ~= "" then
			return string.format(maintenance_categories.incorrectly_formatted, key)
		end
	end

	return ""
end

--- Returns a maintenance category if the |image= value includes the "File:" or "Image:" prefix.
---
--- Infobox parameters checked:
--- - |image=
---
--- @param image string
--- @return string
local function is_image_using_incorrect_syntax(image)
	if not image then
		return ""
	end

	if string.find(image, "[Ff]ile:") or string.find(image, "[Ii]mage:") then
		return string.format(maintenance_categories.incorrectly_formatted, "image")
	end

	return ""
end

--- Returns a maintenance category if the |image_size= value includes "px".
---
--- Infobox parameters checked:
--- - |image_size=
---
--- @param image_size string
--- @return string
local function is_image_size_using_px(image_size)
	if image_size and string.find(image_size, "px") then
		return string.format(maintenance_categories.incorrectly_formatted, "image_size")
	end
	return ""
end

--- Returns a maintenance category if there is no image file while image auxiliary values are present.
---
--- Infobox parameters checked:
--- - |image=
--- - |image_size=
--- - |image_upright=
--- - |image_alt=
--- - |alt=
--- - |caption=
---
--- @param args table
--- @return string
local function are_image_auxiliary_values_used_for_no_image(args)
	if args.image then
		return ""
	end

	if args.image_size or args.image_upright or args.image_alt or args.alt or args.caption then
		return maintenance_categories.image_values_without_an_image
	end

	return ""
end

--- Returns a maintenance category if the infobox title is equal to the article title.
---
--- Infobox parameters checked:
--- - |title=
--- - |series=
--- - |italic_title
---
--- The function currently checks if the infobox title is equal to the article title while ignoring styling such as:
--- - Nowrap spans.
--- - Line breaks.
--- - Leading and trailing apostrophe spaces.
---
--- A return value can be one of three options:
--- - The value of maintenance_categories.non_matching_title - when the args.title does not match the article title.
--- - The value of maintenance_categories.unnecessary_title_parameter - when the args.title matches the article title.
--- - An empty string - when args.title isn't used or the args.title uses an allowed modification
--- (such as a nowrap template) while the rest of the args.title matchs the article title.
---
--- Testing parameters:
--- - |page_test= - a real Wikipedia page to read the content of the page.
--- - |page_title_test= - the title of the page being checked.
---
--- @param frame table
--- @param args table
--- @return string
local function is_infobox_title_equal_to_article_title(frame, args)
	if not args.title then
		return ""
	end

	local page_text
	if args.page_test then
		page_text = mw.title.new(args.page_test):getContent()
	else
		page_text = mw.title.getCurrentTitle():getContent()
	end

	-- Check if the article is using a {{Correct title}} template.
	local correct_title = get_correct_title_value(page_text, args, true)
	if correct_title then
		return correct_title
	end

	local article_title = args.page_title_test
	if not args.page_title_test then
		article_title = mw.title.getCurrentTitle().text
	end

	local title_parts = get_title_parts(article_title)

	-- Check if the article is using a {{Lowercase title}} template.
	local lowercase_title = get_lowercase_template_status(page_text, args, title_parts)
	if lowercase_title then
		return lowercase_title
	end

	if title_parts.disambiguation then
		local series_name_escaped, _ = get_series_name(args.series)
		series_name_escaped = get_name_with_br_fixes(series_name_escaped)
		if series_name_escaped ~= "" and (title_parts.disambiguation == series_name_escaped or string.find(title_parts.disambiguation, series_name_escaped)) then
			-- Remove disambiguation.
			article_title = title_parts.title
		end
	end

	if args.italic_title then
		-- Check if the article is using a {{DISPLAYTITLE}} or {{Italic title}} template.
		local title_modification = get_display_title_text(page_text, article_title)
		if title_modification then
			if title_modification == args.title then
				return maintenance_categories.unnecessary_title_parameter
			else
				return maintenance_categories.non_matching_title
			end
		end
	end

	local page_name = get_page_name_with_apostrophe_quotation_fixes(frame, article_title)

	-- Remove nowrap span.
	if string.find(args.title, "nowrap") then
		local title = frame:expandTemplate{title = "Strip tags", args = {args.title}}
		if title == page_name then
			return ""
		end
		return maintenance_categories.non_matching_title
	end

	-- Remove line breaks and additional spaces as a result.
	if string.find(args.title, "<br%s?/?>") then
		local title = get_name_with_br_fixes(args.title)
		if title == page_name then
			return ""
		end
		return maintenance_categories.non_matching_title
	end

	if args.title == page_name then
		return maintenance_categories.unnecessary_title_parameter
	end

	-- Article and infobox titles do not match.
	return maintenance_categories.non_matching_title
end

--- Returns the relevant maintenance categories based on the {{Infobox television episode}} values validated.
---
--- @param frame table
--- @return string
function p.validate_values(frame)
	local getArgs = require("Module:Arguments").getArgs
	local args = getArgs(frame)

	---@type string[]
	local categories = {}
	table.insert(categories, is_infobox_title_equal_to_article_title(frame, args))
	table.insert(categories, are_image_auxiliary_values_used_for_no_image(args))
	table.insert(categories, is_image_using_incorrect_syntax(args.image))
	table.insert(categories, is_image_size_using_px(args.image_size))
	table.insert(categories, are_values_links_only(args))
	table.insert(categories, are_values_using_overall(args))
	table.insert(categories, are_values_formatted(args))
	table.insert(categories, are_values_linked(args))
	table.insert(categories, has_flag_icon(args))
	table.insert(categories, uses_list_markup(args))
	table.insert(categories, are_dates_formatted_correctly(args.airdate or args.released))
	table.insert(categories, is_italic_title_valid_value(args))

	return table.concat(categories)
end

--- Returns an {{Italic dab2}} instance if title qualifies. Also returns a maintenance category if conditions are met.
---
--- The article's title is italicized if the series name is included in the article's title disambiguation.
--- No italicization happens if one of the following conditions is met:
---
--- - |italic_title= is set to "no".
--- - The article's title does not use disambiguation.
--- - No |series= value is set.
--- - The article's disambiguation is not equal or does not include the series name.
---
--- The page is added to a maintenance category if the title is italicized and there is already an
--- {{Italic dab}}, {{Italic title}} or {{DISPLAYTITLE}} template.
---
--- Infobox parameters checked:
--- - |series=
--- - |italic_title=
---
--- Testing parameters:
--- - |page_test= - a real Wikipedia page to read the content of the page.
--- - |page_title_test= - the title of the page being checked.
---
--- @param frame table
--- @return string, string
function p.italic_title(frame)
	local getArgs = require("Module:Arguments").getArgs
	local args = getArgs(frame)

	local page_text
	if args.page_test then
		page_text = mw.title.new(args.page_test):getContent()
	else
		page_text = mw.title.getCurrentTitle():getContent()
	end

	local maintenance_category = ""
	-- In case the page does not need to be italicized or can't be automatically done, a "no" value will disable both
	-- the italicization and the error handling.
	if args.italic_title == "no" then
		return "", maintenance_category
	end

	local article_title = args.page_title_test
	if not args.page_title_test then
		article_title = mw.title.getCurrentTitle().text
	end

	-- Check if the page already has an {{Italic dab}}, {{Italic title}} or {{DISPLAYTITLE}} template.
	local has_italic_dab, _ = string.find(page_text, "{{[Ii]talic dab")
	local has_italic_title, _ = string.find(page_text, "{{[Ii]talic title")
	local has_display_title, _ = string.find(page_text, "{{DISPLAYTITLE")

	if has_italic_dab or has_italic_title or has_display_title then
		maintenance_category = maintenance_categories.manual_display_title
	end

	local title_parts = get_title_parts(article_title)

	-- The title is not italicized if the title does not use disambiguation or if the series parameter isn't used.
	if not title_parts.disambiguation or not args.series then
		return "", maintenance_category
	end

	local series_name_escaped, series_name = get_series_name(args.series)
	series_name_escaped = get_name_with_br_fixes(series_name_escaped)
	series_name = get_name_with_br_fixes(series_name)

	-- Check if the disambiguation equals the series name or if the series name can be found in the disambiguation.
	local italic_dab
	if title_parts.disambiguation == series_name then
		italic_dab = frame:expandTemplate{title = "Italic dab2"}
	elseif string.find(title_parts.disambiguation, series_name_escaped) then
		italic_dab = frame:expandTemplate{title = "Italic dab2", args = {string = series_name}}
	else
		return "", maintenance_category
	end

	if args.page_title_test and italic_dab then
		italic_dab = "italic_dab"
	end
	return italic_dab, maintenance_category

end

--- Returns a formatted title string.
---
--- @param rtitle string
--- @return string
local function create_title_with_rtitle_value(rtitle)
	local title_pattern = '"(.*)" and "(.*)"'
	if string.find(rtitle, title_pattern) then
		local episode1, episode2 = string.match(rtitle, title_pattern)
		local title_format = "\"'''%s'''\" and \"'''%s'''\""
		return string.format(title_format, episode1, episode2)
	end

	local title_pattern_br = '"(.*)" and%s?<br%s?/?>%s?"(.*)"'
	if string.find(rtitle, title_pattern_br) then
		local episode1, episode2 = string.match(rtitle, title_pattern_br)
		local title_format = "\"'''%s'''\" and<br/> \"'''%s'''\""
		return string.format(title_format, episode1, episode2)
	end

	return string.format("'''%s'''", rtitle)
end

--- Returns the text used for the |above= field of the infobox.
---
--- Infobox parameters checked:
--- - |rtitle=
--- - |title=
--- - |series=
---
--- Testing parameters:
--- - |page_test= - a real Wikipedia page to read the content of the page.
--- - |page_title_test= - the title of the page being checked.
---
--- @param frame table
--- @return string
function p.above_title(frame)
	local getArgs = require("Module:Arguments").getArgs
	local args = getArgs(frame)

	if args.rtitle then
		return create_title_with_rtitle_value(args.rtitle)
	end

	local page
	if args.page_test then
		page = mw.title.new(args.page_test)
	else
		page = mw.title.getCurrentTitle()
	end

	local page_text = page:getContent()

	local article_title = args.page_title_test
	if not args.page_title_test then
		article_title = page.text
	end

	local title_format = "\"'''%s'''\""

	local correct_title = get_correct_title_value(page_text, args, false)
	if correct_title then
		return string.format(title_format, correct_title)
	end

	local title_parts = get_title_parts(article_title)

	local lowercase_title = get_lowercase_template_status(page_text, args, title_parts)
	if lowercase_title then
		return string.format(title_format, lowercase_title)
	end

	if args.italic_title and not args.rtitle then
		local title_modification = get_display_title_text(page_text, article_title)
		if title_modification then
			return string.format(title_format, title_modification)
		end
	end

	if args.title then
		return string.format(title_format, args.title)
	end

	local series_name_escaped, _ = get_series_name(args.series)
	if not title_parts.disambiguation or (series_name_escaped ~= "" and (title_parts.disambiguation == series_name_escaped or string.find(title_parts.disambiguation, series_name_escaped))) then
		return string.format(title_format, get_page_name_with_apostrophe_quotation_fixes(frame, title_parts.title))
	end

	return string.format(title_format, get_page_name_with_apostrophe_quotation_fixes(frame, article_title))
end

--- Returns a list of episodes link if not formatted, otherwise returns the text used for args.episode_list.
---
--- Infobox parameters checked:
--- - |episode_list=
--- - |series=
---
--- @param frame table
--- @return string
function p.episode_list(frame)
	local getArgs = require("Module:Arguments").getArgs
	---@type table<string, string>
	local args = getArgs(frame)

	if args.episode_list then
		for _, v in pairs({"]]", "''"}) do
			if string.find(args.episode_list, v) then
				return args.episode_list
			end
		end

		if string.find(args.episode_list, "[Ss]toryline") then
			return "[[" .. args.episode_list .. "|Storylines]]"
		end

		return "[[" .. args.episode_list .. "|List of episodes]]"
	end

	if args.series then
		local series_name = get_series_link(args.series)
		local list_of_episodes = "List of " .. series_name .. " episodes"

		if mw.title.new(list_of_episodes):getContent() then
			return "[[" .. list_of_episodes .. "|List of episodes]]"
		end
	end
end

--- Returns the relevant maintenance categories based on the {{Infobox television crossover episode}} values validated.
---
--- @param frame table
--- @return string
function p.validate_values_crossover(frame)
	local getArgs = require("Module:Arguments").getArgs
	local args = getArgs(frame)

	---@type string[]
	local categories = {}
	table.insert(categories, are_image_auxiliary_values_used_for_no_image(args))
	table.insert(categories, is_image_using_incorrect_syntax(args.image))
	table.insert(categories, is_image_size_using_px(args.image_size))
	table.insert(categories, has_flag_icon(args))
	table.insert(categories, are_dates_formatted_correctly(args.airdate_overall))

	for i = 1, 5 do
		if not args["series" .. i] then
			break
		end

		local nested_args = {
			series = args["series" .. i],
			episode = args["episode_no" .. i],
			season = args["season" .. i],
			airdate = args["airdate" .. i],
			prev = args["prev" .. i],
			next = args["next" .. i],
			episode_list = args["episode_list" .. i],
		}

		table.insert(categories, are_values_links_only(nested_args))
		table.insert(categories, are_values_using_overall(nested_args))
		table.insert(categories, are_values_formatted(nested_args))
		table.insert(categories, are_values_linked(nested_args))
		table.insert(categories, are_dates_formatted_correctly(nested_args.airdate))
	end

	return table.concat(categories, "")
end

return p