local export = {}

local base_param          = "grundform"
local quality_param       = "fakta"
local meanings_param      = "betydelser"
local width_param         = "bredd"
local as_first_part_param = "förled"
local note_param          = "not"
local auto_number_param   = "autonumrera"

local function addGeneralMetaAttributes(pagename, templatename, args, meta)
	meta.pagename       = pagename
	meta.templatename   = templatename
	meta.quality_notice = args
	meta.meanings       = args or ""
	meta.width          = args
	meta.as_first_part  = args
	meta.note           = args or "-"
	meta.auto_number    = not not args

	return meta
end

local function fillCellArgumentsWithBrackets(args, numbered_cells_count, named_cells)
	for i = 1, numbered_cells_count do
		args = args or "{" .. i .. "}"
	end

	for _, v in ipairs(named_cells) do
		args = "{" .. v .. "}"
	end

	return args
end

local function getFormsAndMeta(pagename, templatename, args, format)
	local meta = export._getMeta(pagename, templatename, args)
	meta = addGeneralMetaAttributes(pagename, templatename, args, meta)

	local parameters_should_be_auto_filled_with_numbers = meta.auto_number
	if parameters_should_be_auto_filled_with_numbers then
		args = fillCellArgumentsWithBrackets(args, meta.numbered_cells, meta.named_cells)
	end

	local forms = export._getForms(pagename, templatename, args, meta, format)

	local forms_and_meta = {
		forms = forms, 
		meta  = meta
	}
	
	return forms_and_meta
end

local function makeArgsTable(frame_args, unused_indices)
	local args = {}
	
	for k, v in pairs(frame_args) do
		if (type(k) ~= "number" or k > unused_indices) then
			if type(k) == "number" then
				args = v
			else
				args = v
			end
		end
	end

	return args
end

local function makeArgsTableFromString(full_template_call_without_brackets)
	local args = {}
	local argument_list = mw.text.split(full_template_call_without_brackets, "|")
	local is_templatename_index = 1

	local function hasExplicitKey(arg)
		return not not arg;
	end
	
	for i, v in ipairs(argument_list) do
		if i ~= is_templatename_index then
			local splitArgument = mw.text.split(argument_list, "=")
			if hasExplicitKey(splitArgument) then
				local key = tonumber(splitArgument) or splitArgument
				local value = splitArgument
				args = value
			else
				local value = splitArgument
				table.insert(args, value)
			end
		end
	end

	return args
end

local function getAcceptedParameters()
	local accepted_parameters = {base_param, quality_param, meanings_param, width_param, as_first_part_param, note_param, auto_number_param}
	
	for _,v in ipairs(export._getAcceptedParameters()) do 
		table.insert(accepted_parameters, v)
	end

	return accepted_parameters
end

local function getCategories(forms, meta, args, modulename)
	local accepted_parameters           = getAcceptedParameters()
	local unallowed_parameters_are_used = false

	local function contains(tbl, val)
	    for _, v in ipairs(tbl) do
	        if v == val then
	            return true
	        end
	    end
	
	    return false
	end

	for k,v in pairs(args) do
		if type(k) == "number" then 
			if k > meta.numbered_cells then
				unallowed_parameters_are_used = true
			end
		else
			if not contains(accepted_parameters, k) then
				unallowed_parameters_are_used = true
			end
		end
	end

	local str = export._getCategories(forms, meta)
	
	if unallowed_parameters_are_used then
		str = str .. "]"
	end
	
	return str
end

function export.getWikitext(frame)
	local args                  = frame:getParent().args
	local title                 = mw.title.getCurrentTitle()
	local prefixed_modulename   = frame:getTitle()
	local prefixed_templatename = frame:getParent():getTitle()
	local pagename              = args or title.text
	local should_categorize     = title.namespace == 0

	local modulename           = mw.ustring.gsub(prefixed_modulename, "^+:", "")
	local templatename          = mw.ustring.gsub(prefixed_templatename, "^+:", "")
	
	local format                = "wikitable"

	local fm                    = getFormsAndMeta(pagename, templatename, args, format)
	local wikitable             = export._getWikitable(fm.forms, fm.meta)
	local categories            = should_categorize and getCategories(fm.forms, fm.meta, args, modulename) or ""
	local str                   = wikitable .. categories

	return str
end

function export.getJson(frame)
	local args         = makeArgsTable(frame.args, 0)
	local pagename     = frame.args
	local templatename = mw.text.split(frame.args, "%|")
	local format       = "export"

	local fm           = getFormsAndMeta(pagename, templatename, args, format)
    local json         = mw.text.jsonEncode(fm.forms)

	return json
end

function export.test(pagename, templatename_with_args, format, meta_args_to_include_in_result)
	local args                    = makeArgsTableFromString(templatename_with_args)
	local templatename            = mw.ustring.match(templatename_with_args, "^(+)|?")

	local include_meta_in_results = not not meta_args_to_include_in_result

	local forms_and_meta          = getFormsAndMeta(pagename, templatename, args, format)

	local result
	if include_meta_in_results then
		local new_meta = {}

		for i, v in ipairs(meta_args_to_include_in_result) do
			new_meta = forms_and_meta.meta
		end

		forms_and_meta.meta = new_meta
		
		result = forms_and_meta	
	else
		result = forms_and_meta.forms
	end
	
	return result
end

return export