Module:BuildingLink

Documentation for this module may be created at Module:BuildingLink/doc

---
--- This module renders the {{Building_link}} template.
--- https://hoodedhorse.com/wiki/Against_the_Storm/Template:Building_link
---
--- The template #invokes BuildingLink.renderLink(frame), below.
---
--- The template requires an argument, the name of the building to link to.
--- Optionally, the template accepts a second argument to render an icon next
--- to the link. The building is passed to Module:WorkshopsData, which is used
--- to identify the wiki page to link to.
---
--- Using the data returned, this module creates an icon and the name of the
--- building, and wraps both in a link to the building's wiki page. If no icon
--- size is specified, only the name of the building will be rendered by the
--- template.
---
--- The icons are sized consistently by using existing wiki templates,
--- {{ImgS}}, {{ImgM}}, etc. The sizes of the icons are not stored or known by
--- this module.
---
--- @module BuildingLink
local BuildingLink = {}



local WorkshopsData = require("Module:WorkshopsData")
local InstitutionsData = require("Module:InstitutionsData")
local FarmsData = require("Module:FarmsData")
local CampsData = require("Module:CampsData")



--region Private constants

local DEFAULT_SIZE_SMALL = "small"

local ICON_SIZES = {
	[DEFAULT_SIZE_SMALL] = mw.getCurrentFrame():expandTemplate{ title = "ImgS" },
	["med"] = mw.getCurrentFrame():expandTemplate{ title = "ImgM" },
	["large"] = mw.getCurrentFrame():expandTemplate{ title = "ImgL" },
	["huge"] = mw.getCurrentFrame():expandTemplate{ title = "ImgH" }
}

local NBSP = " "

--endregion



--region Public methods

---
--- Renders an icon and the name of a building linked to a wiki page
--- corresponding to the provided building.
---
--- Uses MediaWiki markup to display the name of a wiki page and an icon that
--- has been uploaded to the wiki. Both must be known by the data model,
--- or the template's behavior may be different than expected.
---
--- @param frame table the template's calling context, with parameters
--- @return string wiki markup
function BuildingLink.renderLink(frame)

	-- Extract the template parameters.
	local argBuildingName = frame.args.building
	local argIconSize = frame.args.iconsize

	-- Validate that there's a name to use.
	if not argBuildingName or "" == argBuildingName then
		return "The Building Link template requires the a name of a building."
	end

	-- Look up the icon from the data sources. This validates that the building
	-- name that was provided is spelled correctly and, if used, will link into
	-- a valid page.
	local iconFilename

	local workshopIconFilename = WorkshopsData.getWorkshopIcon(argBuildingName)
	if workshopIconFilename then
		iconFilename = workshopIconFilename
	else
		local InstitutionIconFilename = InstitutionsData.getInstitutionIcon(argBuildingName)
		if InstitutionIconFilename then
			iconFilename = InstitutionIconFilename
		else
			local FarmIconFilename = FarmsData.getFarmIcon(argBuildingName)
			if FarmIconFilename then
				iconFilename = FarmIconFilename
			else
				local CampIconFilename = CampsData.getCampIcon(argBuildingName)
				if CampIconFilename then
					iconFilename = CampIconFilename
				else
					return "No building found with provided name: " .. argBuildingName .. "."
				end
			end
		end
	end

	-- Wiki link to the building's page just uses the in-game name.
	local linkPart = "[[" .. argBuildingName .. "]]"

	-- If the specified size is small, skip the icon.
	if argIconSize == DEFAULT_SIZE_SMALL then
		return linkPart
	end

	local size = ICON_SIZES[argIconSize]

	-- If the specified size was invalid, skip the icon.
	if not size then
		return linkPart
	end

	local iconPart = "[[File:" .. iconFilename .. "|" .. size ..
			"|link=" .. argBuildingName .. "|alt=" .. argBuildingName .. "|" .. argBuildingName .. "]]"

	-- combine the file part with the link part
	return iconPart .. NBSP .. linkPart
end

--endregion

return BuildingLink