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local util = require('Module:Util')
local util_args = require('Module:ArgsUtil')
local util_dpl = require('Module:DPLUtil')
local util_table = require('Module:TableUtil')
local util_title = require('Module:TitleUtil')

local tabs = require('Module:AutomatedTabs').main
local Navbox = require('Module:SubpageNavbox').navbox
local After = require('Module:SubpageAfter').after

--[[ json structure:
	{
		links = a, b, c, d,
		names = ,
		a = { links = , names = }, b = { links = , names = }
		names table is added only after construction of links table
		construction is recursive
	}
]]
local p = {}

function p.getPageList(frame, title, fulltitle, title_obj)
	local pages = frame:callParserFunction{name = '#dpl', args = {
		'',
		titleregexp = '^' .. util_dpl.escape(title_obj.rootText) .. '/.*',
		format = ',%PAGE%,;,',
		namespace = title_obj.nsText,
		debug = 0,
		notuses = 'Template:NoDPLTabs',
		skipthispage = 'no'
	}}
	if pages == '' and title == fulltitle then return nil end
	local pgtbl = mw.text.split(pages,';')
	p.processPageTable(pgtbl)
	return pgtbl
end

function p.processPageTable(pgtbl)
	for k, v in ipairs(pgtbl) do
		if not k or k == '' then
			table.remove(pgtbl,k)
		else
			pgtbl[k] = mw.text.split(v,'/')
			table.remove(pgtbl[k],1) -- get rid of the base page
		end
	end
	return
end

function p.jsonFromPages(pages, tabstype)
	local data = mw.loadData('Module:SubpageSettings')[tabstype]
	local json = { links = { 'Overview' } }
	p.jsonLoop(json, pages)
	p.processJson(json, data.lookup, data.order, '')
	return json
end

function p.jsonLoop(json, pages)
	-- go through all of the pages from our dpl list, and for each page add its data to the json
	while #pages > 0 do
		local page = table.remove(pages,1)
		p.pageRecursion(json, page)
		p.addMissingPages(json)
	end
	return
end

function p.pageRecursion(json, page)
	-- the page should always exist, but when we reach the end of our recursion for this one page, #page will be 0
	if not page or #page == 0 then
		return
	end
	-- pull out the first titlepart of the page, and the rest of the page will be dealt with later when we call this again
	titlepart = table.remove(page, 1)
	if #page > 0 then
		-- if we dont have an entry at this level yet
		if not json[titlepart] then
			-- assume the 1st thing is going to be called Overview
			json[titlepart] = { links = { 'Overview' } }
		end
		-- recursion
		-- json[titlepart] is one step later, and page has been truncated
		p.pageRecursion(json[titlepart],page)
	elseif #page == 0 then
		-- if we are on the very last part of the page then just append the current page to the list
		json.links[#json.links+1] = titlepart
	end
	return
end

function p.addMissingPages(json)
	-- if there's no overview for statistics for example, we still want to print the stats
	for k, v in pairs(json) do
		-- actually pretty sure everything in the json is a table but we'll just double check to avoid errors
		-- want to skip this for links obviously
		if type(v) == 'table' and k ~= 'links' then
			if not util_table.keyOf(json.links, k) then
				-- k is the set of sub-subpages, so if there's no subpage of this then we want to add it
				json.links[#json.links+1] = k
				-- also in this case that means there's no overview. because we made an overview by default
				-- we now need to remove it from the list of sub-subpages
				if v.links[1] then
					table.remove(v.links,1)
				end
			end
			p.addMissingPages(v)
		end
	end
end

function p.processJson(json, lookup, order, index)
	p.processJsonLinks(json, order)
	-- add the name list
	json.names = {}
	for k, link in ipairs(json.links) do
		json.names[k] = lookup[index .. link] or link
	end
	-- recursion
	for k, v in pairs(json) do
		if v.links then
			p.processJson(v, lookup, order[k] or {}, k)
		end
	end
	return
end

function p.processJsonLinks(json, order)
	-- we already added the missing links in p.addMissingPages, so no need to do that again here
	
	-- sort links
	util_table.sortByKeyOrder(json.links, order)
	
	-- remove overview if we don't have an overview, since json creation automatically adds one
	-- but actually we may have already removed the overview in the event that the page doesn't exist period
	-- but if the page exists & we don't want it to be here, then we will remove it now
	-- this code means that you may want to specify both Overview as being the first element of your
	-- page order array in SubpageTabs and also have nooverview=true in the same line
	if order.nooverview and json.links[1] == 'Overview' then
		table.remove(json.links,1)
	end
	return
end

function p.linkAdjustments(json, title, tabstype)
	local tbl = { fr = { find = {}, replace = {} }, cd = {} }
	local data = mw.loadData('Module:SubpageSettings')[tabstype].order
	p.linkAdjustmentsRecursion(json, title, data, tbl)
	return tbl
end

function p.linkAdjustmentsRecursion(json, title, data, tbl)
	for _, v in ipairs(json.links) do
		if json[v] and json[v].links and data[v] then
			local lr = data[v .. '_linkrecent']
			if lr then
				new_title = util_title.concatSubpage(title, v)
				-- optionally can define _linkrecent=true to just show the last one
				-- or can specify a specific tab to show as a string
				-- we'll pick what to focus depending
				local focused = type(lr) == 'string' and lr or json[v].links[#json[v].links]
				tbl.cd[new_title] = util_title.concatSubpage(new_title, focused)
			end
			p.linkAdjustmentsRecursion(json[v], new_title, data[v], tbl)
		end
	end
	return
end

function p.main(frame)
	local args = util_args.merge(true)
	local tabstype = args[1] or 'Player'
	local title_obj = mw.title.getCurrentTitle()
	local fulltitle = title_obj.prefixedText
	local title = tostring(title_obj.rootPageTitle)
	local pages = p.getPageList(frame, title, fulltitle, title_obj)
	local json = pages and p.jsonFromPages(pages, tabstype)
	local data = {
		linkadjustments = json and json.links and p.linkAdjustments(json, title, tabstype),
		navboxdata = (args.nonavbox ~= 'Yes') and Navbox(tabstype, title),
		after = title_obj.namespace == 0 and After(frame, fulltitle,tabstype),
		basepage = title,
		tabstype = args.tabstype or 'header'
	}
	return tabs(json, data)
end
return p
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