local a = {}

local good_args = {
	['away_goals_header'] = 1,
	['bonus_header'] = 1,
	['class_rules'] = 1,
	['draw_header'] = 1,
	['drawpoints'] = 1,
	['float'] = 1,
	['for_against_style'] = 1,
	['GB_team'] = 1,
	['goalpoints'] = 1,
	['group_header'] = 1,
	['hide_for_against_columns'] = 1,
	['hide_played'] = 1,
	['hide_results'] = 1,
	['highest_pos'] = 1,
	['legs'] = 1,
	['loss_before_draw'] = 1,
	['loss_before_tie'] = 1,
	['losspoints'] = 1,
	['lowest_pos'] = 1,
	['matches_style'] = 1,
	['matches_text'] = 1,
	['match_col_width'] = 1,
	['note_header_res'] = 1,
	['only_pld_pts'] = 1,
	['only_totals'] = 1,
	['only_fa_totals'] = 1,
	['pct_style'] = 1,
	['pld_header'] = 1,
	['postitle'] = 1,
	['perc_first'] = 1,
	['pts_first'] = 1,
	['ranking_style'] = 1,
	['res_col_header'] = 1,
	['result_prefix'] = 1,
	['rwpoints'] = 1,
	['rw_header'] = 1,
	['section'] = 1,
	['short_style'] = 1,
	['show_GB'] = 1,
	['show_away_goals'] = 1,
	['show_bonus_points'] = 1,
	['show_class_rules'] = 1,
	['show_draw'] = 1,
	['show_groups'] = 1,
	['show_limit'] = 1,
	['show_matches'] = 1,
	['show_positions'] = 1,
	['show_rw'] = 1,
	['show_status'] = 1,
	['show_totals'] = 1,
	['solid_cell'] = 1,
	['sortable_table'] = 1,
	['source'] = 1,
	['start_date'] = 1,
	['stack_footer'] = 1,
	['status_order'] = 1,
	['status_pos'] = 1,
	['style'] = 1,
	['table_header'] = 1,
	['table_header_source'] = 1,
	['team_header'] = 1,
	['team_order'] = 1,
	['team_order_start'] = 1,
	['teamwidth'] = 1,
	['template_name'] = 1,
	['title'] = 1,
	['title_source'] = 1,
	['transcludesection'] = 1,
	['update'] = 1,
	['use_goal_average'] = 1,
	['use_goal_diff'] = 1,
	['use_goal_percentage'] = 1,
	['use_goal_ratio'] = 1,
	['use_goals_scored'] = 1,
	['use_point_percentage'] = 1,
	['use_goals_per_match'] = 1,
	['use_points_per_match'] = 1,
	['use_tie'] = 1,
	['winpoints'] = 1,
}
local good_args_HA = {
	['hdrawpoints'] = 1,
	['adrawpoints'] = 1,
	['hlosspoints'] = 1,
	['alosspoints'] = 1,
	['hwinpoints'] = 1,
	['awinpoints'] = 1
}
local good_args_PKOT = {
	['showOTloss'] = 1,
	['showOTwin'] = 1,
	['showPKloss'] = 1,
	['showPKwin'] = 1,
	['show_tiebr'] = 1,
	['PKlosspoints'] = 1,
	['OTlosspoints'] = 1,
	['PKwinpoints'] = 1,
	['OTwinpoints'] = 1,
	['PKloss_after_loss'] = 1,
	['OTloss_after_loss'] = 1,
	['tiebr_header'] = 1,
}
local ignored_args = {
	['date'] = 1,
	['ptsfirst'] = 1
}
local col_names = {
	['adjust_points'] = 1,
	['away_goals'] = 1,
	['draw'] = 1,
	['loss'] = 1,
	['gf'] = 1,
	['ga'] = 1,
	['group'] = 1,
	['pf'] = 1,
	['pa'] = 1,
	['matches'] = 1,
	['pos'] = 1,
	['rw'] = 1,
	['short'] = 1,
	['startpoints'] = 1,
	['status'] = 1,
	['win'] = 1,
}
local col_names_HA = {
	['draw'] = 0,
	['loss'] = 0,
	['gf'] = 0,
	['ga'] = 0,
	['pf'] = 0,
	['pa'] = 0,
	['rw'] = 0,
	['hdraw'] = 1,
	['adraw'] = 1,
	['hloss'] = 1,
	['aloss'] = 1,
	['hwin'] = 1,
	['awin'] = 1,
	['hga'] = 1,
	['aga'] = 1,
	['hgf'] = 1,
	['agf'] = 1,
	['hpa'] = 1,
	['apa'] = 1,
	['hpf'] = 1,
	['apf'] = 1,
}
local col_names_PKOT = {
	['PKloss'] = 1,
	['OTloss'] = 1,
	['PKwin'] = 1,
	['OTwin'] = 1,
	['tiebr'] = 1
}
local tracked_styles = {
	['football'] = 'WDL',
	['WDL'] = 'WDL',
	['WL'] = 'WDL',
	['WDLHA'] = 'HA',
	['WDL OT'] = 'PKOT',
	['WLHA'] = 'HA',
	['WL OT'] = 'PKOT',
	['WL PK'] = 'PKOT',
	['WL OTL tiebreak'] = 'PKOT'
}

function a.check(targs, pargs)
	local teams = {}
	local missing_teams = {}
	local results = {}
	local missing_results = {}
	local orphaned_match_notes = {}
	local orphaned_results = {}
	local orphaned_names = {}
	local orphaned_notes = {}
	local ignored = {}
	local possibly_ignored = {}
	local unknown = {}
	local warn = {}
	local track = {}
	
	local mstyle = mw.ustring.gsub(targs['style'] or '', '[%s_][%s_]*', ' ')
	mstyle = tracked_styles[mstyle]
	
	if mstyle == nil then
		return warn,track
	end
	
	if mstyle == 'HA' then
		for k, v in pairs(good_args_HA) do
			good_args[k] = v ~= 0 and v or nil
		end
		for k, v in pairs(col_names_HA) do
			col_names[k] = v ~= 0 and v or nil
		end
		if targs['only_fa_totals'] then
			col_names['pf'] = 1
			col_names['gf'] = 1
			col_names['pa'] = 1
			col_names['ga'] = 1
		end
	end
	
	if mstyle == 'PKOT' then
		for k, v in pairs(good_args_PKOT) do
			good_args[k] = v ~= 0 and v or nil
		end
		for k, v in pairs(col_names_PKOT) do
			col_names[k] = v ~= 0 and v or nil
		end
	end
	
	-- Alternative syntax for team list
	if targs['team_order'] and targs['team_order'] ~= '' then
		local tlist = mw.text.split(targs['team_order'], '%s*[;,]%s*')
		for k, tname in ipairs(tlist) do
			if tname ~= '' then
				targs['team' .. k] = tname
			end
		end
	end
	
	-- Limited tracking if we are only showing part of the table
	if targs['showteam'] then
		local top_pos = tonumber(targs['highest_pos']) or 1
		local bottom_pos = tonumber(targs['lowest_pos']) or 0
		local N = top_pos - 1
		while targs['team'..N+1] ~= nil and (bottom_pos < top_pos or N < bottom_pos) do
			N = N + 1
			teams[targs['team'..N]] = 1
			if teams[targs['showteam']] then
				return warn,track
			end
		end
	end

	-- Step 1: Generate a team and result list
	for k,v in pairs(targs) do
		if type(k) == 'string' then
			if k:find('^team%d%d*$') then
				teams[v] = 1
				targs[k] = ''
				if targs['name_' .. v] then
					-- Great!
					targs['name_' .. v] = ''
				else
					table.insert(missing_teams, v)
				end
				if targs['note_' .. v] then
					targs['note_' .. v] = ''
				end
				if targs['hth_' .. v] then
					local multiref = 1
					local hth_local_table = mw.text.split(targs['hth_' .. v], '%s*,%s*')
					if (#hth_local_table > 1) then
						for j, hth_loc in ipairs(hth_local_table) do
							multiref = multiref * (targs['hth_' .. hth_loc] and 1 or 0)
						end
					else
						multiref = 0
					end
					if multiref > 0 then
						for j, hth_loc in ipairs(hth_local_table) do
							targs['hth_' .. hth_loc] = ''
						end
					elseif targs['hth_' .. targs['hth_' .. v]] then
						targs['hth_' .. targs['hth_' .. v]] = ''
					end
					targs['hth_' .. v] = ''
				end
			elseif k:find('^result%d%d*$') or k:find('^.*_result%d%d*$') then
				local pre = mw.ustring.gsub(k, '^(.*)result%d%d*$', '%1')
				results[v] = 1
				targs[k] = ''
				if targs[pre .. 'col_' .. v] or targs[pre .. 'text_' .. v] or targs[pre .. 'note_res_' .. v] then
					-- Great!
					if targs[pre .. 'col_' .. v] then
						targs[pre .. 'col_' .. v] = ''
					end
					if targs[pre .. 'text_' .. v] then
						targs[pre .. 'text_' .. v] = ''
					end
					if targs[pre .. 'note_res_' .. v] then
						local multiref = 1
						local note_res_local_table = mw.text.split(targs[pre .. 'note_res_' .. v], '%s*,%s*')
						if (#note_res_local_table > 1) then
							for j, note_res_loc in ipairs(note_res_local_table) do
								multiref = multiref * (targs[pre .. 'note_res_' .. note_res_loc] and 1 or 0)
							end
						else
							multiref = 0
						end
						if multiref > 0 then
							for j, note_res_loc in ipairs(note_res_local_table) do
								targs[pre .. 'note_res_' .. note_res_loc] = ''
							end
						elseif targs[pre .. 'note_res_' .. targs[pre .. 'note_res_' ..  v]] then
							targs[pre .. 'note_res_' ..  targs[pre .. 'note_res_' ..  v]] = ''
						end
						targs[pre .. 'note_res_' .. v] = ''
					end
					if targs[pre .. 'res_col_header'] then
						targs[pre .. 'res_col_header'] = ''
					end
				else
					table.insert(missing_results, v)
				end
			elseif k:find('^match[%d]*_.*_.*_note$') then
				local m = mw.ustring.gsub(k, '^(match[%d]*_.*_.*)_note$', '%1')
				targs[k] = ''
				if targs[m] then
					if targs['note_' .. v] then
						targs['note_' .. v] = ''
					end
					-- Great!
				else
					table.insert(orphaned_match_notes, m)
				end
			end
		end
	end

	local possible_missing_winpoints = 0
	for k,v in pairs(targs) do
		if v and v~= '' then
			local found_arg = 0
			if type(k) == 'string' then
				if k:find('^adjust_points_') then
					local p = mw.ustring.gsub(k, '^adjust_points_', '')
					if (tonumber(v) or 0) ~= 0 then
						local pdiff = (tonumber(targs['win_' .. p] or 0) or 0) + tonumber(v)
						if pdiff == 0 then
							possible_missing_winpoints = possible_missing_winpoints + 1
						else
							possible_missing_winpoints = possible_missing_winpoints - 1
						end
					end
				end
				if found_arg == 0 and (good_args[k] or k:find('^split[%d][%d]*$')) then
					-- Great!
					found_arg = 1
				end
				if found_arg == 0 and k == 'showteam' then
					-- Great!
					found_arg = 1
					if teams[v] ~= 1 then
						table.insert(missing_teams, v)
					end
				end
				if found_arg == 0 and (ignored_args[k] or k:find('^att_')) then
					found_arg = 1
					table.insert(ignored, k)
				end
				if found_arg == 0 and k:find('^[A-Za-z]*_.*$') then
					local p = mw.ustring.gsub(k, '^([A-Za-z]*)_.*$', '%1')
					if col_names[p] then
						-- Great!
						found_arg = 1
					end
				end
				if found_arg == 0 and k:find('^[A-Za-z]*_[A-Za-z]*_.*$') then
					local p = mw.ustring.gsub(k, '^([A-Za-z]*_[A-Za-z]*)_.*$', '%1')
					if col_names[p] then
						-- Great!
						found_arg = 1
					end
				end

				if found_arg == 0 and k:find('^match[%d]*_.*_.*$') then
					local t1 = mw.ustring.gsub(k, '^match[%d]*_(.*)_(.*)$', '%1')
					local t2 = mw.ustring.gsub(k, '^match[%d]*_(.*)_(.*)$', '%2')
					found_arg = 1
					if teams[t1] == nil or teams[t2] == nil then
						if teams[t1] == nil then
							table.insert(missing_teams, t1)
						end
						if teams[t2] == nil then
							table.insert(missing_teams, t2)
						end
					end
				end
				if found_arg == 0 and k:find('^result_.*_.*$') then
					local t1 = mw.ustring.gsub(k, '^result[%d]*_(.*)_(.*)$', '%1')
					local t2 = mw.ustring.gsub(k, '^result[%d]*_(.*)_(.*)$', '%2')
					found_arg = 1
					if teams[t1] == nil or teams[t2] == nil then
						if teams[t1] == nil then
							table.insert(missing_teams, t1)
						end
						if teams[t2] == nil then
							table.insert(missing_teams, t2)
						end
					end
				end
				if found_arg == 0 and (k:find('^name_') or k:find('^short_')) then
					found_arg = 1
					table.insert(orphaned_names, k)
				end
				if found_arg == 0 and (k:find('^note_') or k:find('^hth_')) then
					found_arg = 1
					if (k == 'hth_ABC' and v == 'H2H note') then
						table.insert(warn, '[[Category:Pages using sports table with ignored parameters|hth_ABC]]')
					elseif (k == 'note_ABC' and v == 'Team note') then
						table.insert(warn, '[[Category:Pages using sports table with ignored parameters|note_ABC]]')
					elseif (k == 'note_res_AAA' and v == 'Result note') then
						table.insert(warn, '[[Category:Pages using sports table with ignored parameters|note_res_AAA]]')
					else
						table.insert(orphaned_notes, k)
					end
				end
				if found_arg == 0 and (k:find('^col_') or k:find('^text_')) then
					found_arg = 1
					table.insert(orphaned_results, k)
				end
			end
			if found_arg == 0 then
				if pargs[k] and pargs[k] ~= '' then
					if tonumber(k) then
						k = k .. ' = ' .. v
					end
					table.insert(possibly_ignored, k)
				else
					if tonumber(k) then
						k = k .. ' = ' .. v
					end
					table.insert(unknown, k)
				end
			end
		end
	end
	
	local badchar = '[^A-Za-z0-9_%(%)%- ]'
	for k,v in ipairs(unknown) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with unknown parameters|' .. v .. ']]')
	end
	for k,v in ipairs(missing_teams) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with missing teams|' .. v .. ']]')
	end
	for k,v in ipairs(missing_results) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with missing results|' .. v .. ']]')
	end
	for k,v in ipairs(orphaned_results) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with orphaned results|' .. v .. ']]')
	end
	for k,v in ipairs(orphaned_names) do
		v = mw.ustring.gsub(v, '[^A-Za-z0-9_ ]', '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with orphaned names|' .. v .. ']]')
	end
	for k,v in ipairs(orphaned_notes) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with orphaned notes|' .. v .. ']]')
	end
	for k,v in ipairs(orphaned_match_notes) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with orphaned match notes|' .. v .. ']]')
	end
	for k,v in ipairs(ignored) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(warn, '[[Category:Pages using sports table with ignored parameters|' .. v .. ']]')
	end
	for k,v in ipairs(possibly_ignored) do
		v = mw.ustring.gsub(v, badchar, '?')
		if v == '' then v = ' ' end
		table.insert(track, '[[Category:Pages using sports table with possibly ignored parameters|' .. v .. ']]')
	end
	
	if possible_missing_winpoints > 1 then
		table.insert(track, '[[Category:Pages using sports table with possible incorrect winpoints|' .. possible_missing_winpoints .. ']]')
	end
	
	return warn,track
end

return a