Module:OSMWikiBase

local getArgs = require('Module:Arguments').getArgs
local titleParser = require('Module:OsmPageTitleParser')
local p = {}


local wb = function()
	if mw and mw.wikibase and mw.wikibase.getEntity then
		return nil
	else
		return "<span class='error'>DataItems are having issues</span>"
	end
end

-- Given an entity, get key/tag/relation string with the optional localization,
-- or just get the label in the requested language
local getLabel = function(entity, lang)
	if entity then
		if entity.claims then
			for _, prop in ipairs({'P16', 'P19', 'P21', 'P52', 'P53'}) do
				local statement = entity:getBestStatements(prop)[1]
				if statement then
					local result = statement.mainsnak.datavalue.value
					if lang and lang ~= 'en' then
						-- get nativekey/nativevalue if available
						local native = entity:getLabel(lang)
						if native then
							result = result .. ' (' .. native .. ')'
						end
					end
					return result
				end
			end
		end
		return (
			entity:getLabel(lang) or
			entity:getLabel('en') or
			'(' .. entity:getId() .. ')'
		)
	else
		return "ERROR: Invalid ID"
	end
end

-- Given an entity, just get the label in the requested language
local getLabelonly = function(entity, lang)
	if entity then
		local label = entity:getLabel(lang) or entity:getLabel('en')
		return label
	end
end

-- Given an entity and a type of tag (key, value, prefix, suffix), just get the respective permanent ID
local getPermanentID = function(entity, tagType)
	if entity and entity.claims then
		if tagType == 'key' then
			if entity.claims['P16'] then
				return entity.claims['P16'][1].mainsnak.datavalue.value
			else return "-"
			end
		elseif tagType == 'value' then
			if entity.claims['P19'] then
				return entity.claims['P19'][1].mainsnak.datavalue.value
			else return "-"
			end
		elseif tagType == 'prefix' then
			if entity.claims['P52'] then
				return entity.claims['P52'][1].mainsnak.datavalue.value
			else return "-"
			end
		elseif tagType == 'suffix' then
			if entity.claims['P53'] then
				return entity.claims['P53'][1].mainsnak.datavalue.value
			else return "-"
			end
		else return "Invalid or not specified type of tag: Use parameters key, value, prefix, or suffix."
		end
	end
	return "Invalid ID" 
end

-- Given an entity, get the description in the requested language or fallback to EN
local getDescription = function(entity, lang)
	local res = ''
	if entity.descriptions then
		res = entity:getDescription(lang) or entity:getDescription('en') or ''
	end
	return res
end

-- Formats entity's label with the optional description
local formatEntity = function(entity, lang, anchor)
	local label = getLabel(entity, lang)
	if not entity then
		return label
	end
	local desc = getDescription(entity, lang)
	local ns = entity.id:sub(1, 1) == 'Q' and 'Item:' or 'Property:'
	local link = ns .. entity.id
	if anchor then
		link = link .. '#' .. anchor
	end
	local text = mw.html.create( 'span' )
	text:attr('title', desc)
		:wikitext(mw.text.nowiki(label) .. ' ')
		:tag('small')
    		:wikitext('(' .. entity.id .. ')')

	return '[[' .. link .. '|' .. tostring(text) .. ']]'
end

-- if lang is not given, tries to figure it out based on the current page title
local getLang = function(lang)
	if not lang then
		local parsed = titleParser.parseTitle(mw.title.getCurrentTitle())
		if parsed then
		 	return parsed.language:getCode()
	 	end
	end
	return lang
end

--------------------------------------------------------------------------------
-- Public functions
--------------------------------------------------------------------------------

-- Debug console usage:    =p.formatEntity({'Q888'})
-- with lang               =p.formatEntity({'Q888', 'ru'})
function p.formatEntity(frame)
	local args = getArgs(frame)
	return wb() or formatEntity(mw.wikibase.getEntity(args[1]), getLang(args[2]), args[3])
end

-- Debug console usage:    =p.getLabel({'Q888'})
-- with lang               =p.getLabel({'Q888', 'ru'})
function p.getLabel(frame)
	local args = getArgs(frame)
	return wb() or getLabel(mw.wikibase.getEntity(args[1]), getLang(args[2]))
end

-- Debug console usage:    =p.getLabelonly({'Q888'})
-- with lang               =p.getLabelonly({'Q888', 'ru'})
function p.getLabelonly(frame)
	local args = getArgs(frame)
	return wb() or getLabelonly(mw.wikibase.getEntity(args[1]), getLang(args[2]))
end

-- Debug console usage:    =p.getPermanentID({'Q464', 'key'})
--                         =p.getPermanentID({'Q888', 'value'})
--                         =p.getPermanentID({'Q174', 'prefix'})
--                         =p.getPermanentID({'Q22132', 'suffix'})
function p.getPermanentID(frame)
	local args = getArgs(frame)
	return wb() or getPermanentID(mw.wikibase.getEntity(args[1]), args[2])
end

-- Debug console usage:    =p.getDescription({'Q888'})
-- with lang               =p.getDescription({'Q888', 'ru'})
function p.getDescription(frame)
	local args = getArgs(frame)
	return wb() or getDescription(mw.wikibase.getEntity(args[1]), getLang(args[2]))
end

return p
Module:OSMWikiBase

getLabel

getDescription

formatEntity

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