#!/usr/bin/env lua5.1

local marigold = require 'marigold-cgi.marigold'
local h = marigold.h
local b64 = require '3rdparty.base64'
local json = require '3rdparty.json'
local draw = require 'draw'


local function error(message)
	print('Content-type: text/plain\n')
	print(string.format('ERROR: %s', message))
	os.exit(1)
end


-- get statistics
local metavars = marigold.get_metavars()
local query = marigold.decode_query(metavars.query_string or '')
if not query.statistics then
	error('no statistics submitted!')
end
local statistics = json.decode(b64.decode(query.statistics))
local theme = (query.theme and json.decode(b64.decode(query.theme))) or {
	bg='white', text='black', flair='darkred',
}


-- create & respond with image
local svg = draw.draw(statistics, theme)
print('Content-type: image/svg+xml\n')
print(svg)