doc = {}

doc.VERSION = {}
doc.VERSION.MAJOR = 0
doc.VERSION.MINOR = 1
doc.VERSION.PATCH = 0
doc.VERSION.STRING = "0.1.0"


doc.data = {}
doc.data.categories = {}
doc.data.entries = {}


function doc.new_category(id, def)
	if doc.data.categories[id] ~= nil and id ~= nil then
		doc.data.categories[id] = def
	end
end

function doc.new_entry(def)
	if doc.data.entries[id] ~= nil and id ~= nil then
		doc.data.entries[id] = def
	end
end

function doc.show_doc(playername)
	local formspec = doc.formspec_core()..doc.formspec_main()
	minetest.show_formspec(playername, "doc:main", formspec)
end

function doc.formspec_core(tab)
	if tab == nil then tab = 1 else tab = tostring(tab) end
	return "size[12,9]tabheader[0,0;doc_header;Main,Category,Entry;"..tab..";true;false]"
end

function doc.formspec_main()
	return "label[0,1;Main]"
end

function doc.formspec_category()
	return "label[0,1;Category]"
end

function doc.formspec_entry()
	return "label[0,1;Entry]"
end

function doc.process_form(player,formname,fields)
	local playername = player:get_player_name()
	--[[ process clicks on the tab header ]]
	if(formname == "doc:main" or formname == "doc:category" or formname == "doc:entry") then
		if fields.doc_header ~= nil then
			local tab = tonumber(fields.doc_header)
			local formspec, subformname, contents
			if(tab==1) then
				contents = doc.formspec_main()
				subformname = "main"
			elseif(tab==2) then
				contents = doc.formspec_category()
				subformname = "category"
			elseif(tab==3) then
				contents = doc.formspec_entry()
				subformname = "entry"
			end
			formspec = doc.formspec_core(tab)..contents
			minetest.show_formspec(playername, "doc:" .. subformname, formspec)
			return
		end
	end
end

minetest.register_on_player_receive_fields(doc.process_form)

minetest.register_chatcommand("doc", {
	params = "",
	description = "Show in-game documentation system.",
	privs = {},
	func = function(playername, param)
		doc.show_doc(playername)
	end,
	}
)