class QuickChart

# File lib/quickchart.rb, line 15
def initialize(
  config,
  width: 500,
  height: 300,
  background_color: '#ffffff',
  device_pixel_ratio: 1.0,
  format: 'png',
  key: nil,
  base_url: 'https://quickchart.io'
)
  @config = config
  @width = width
  @height = height
  @background_color = background_color
  @device_pixel_ratio = device_pixel_ratio
  @format = format
  @key = key
  @base_url = base_url
end

# File lib/quickchart.rb, line 51
def _http_post(path)
  spec = Gem.loaded_specs['quickchart']
  version = spec ? spec.version.to_s : 'unknown'
  request_headers = { 'user-agent' => "quickchart-ruby/#{version}" }

  params = {
    c: @config.is_a?(String) ? @config : @config.to_json,
    w: @width,
    h: @height,
    bkg: @background_color,
    devicePixelRatio: @device_pixel_ratio,
    f: @format
  }
  params['key'] = @key if @key

  uri = URI("#{@base_url}#{path}")
  https = Net::HTTP.new(uri.host, uri.port)
  https.use_ssl = true
  req = Net::HTTP::Post.new(uri.path, 'Content-Type' => 'application/json')
  req.body = params.to_json

  https.request(req)
end

# File lib/quickchart.rb, line 75
def get_short_url
  res = _http_post('/chart/create')
  raise "Request error: #{res.body}" unless (200..300).cover? res.code.to_i

  JSON.parse(res.body)['url']
end

# File lib/quickchart.rb, line 35
def get_url
  params = {
    c: @config.is_a?(String) ? @config : @config.to_json,
    w: @width,
    h: @height,
    bkg: @background_color,
    devicePixelRatio: @device_pixel_ratio,
    f: @format
  }
  params['key'] = @key if @key

  encoded = params.to_a.map { |x| "#{x[0]}=#{CGI.escape(x[1].to_s)}" }.join('&')

  "#{@base_url}/chart?#{encoded}"
end

# File lib/quickchart.rb, line 82
def to_blob
  res = _http_post('/chart')
  res.body
end

# File lib/quickchart.rb, line 87
def to_file(path)
  data = to_blob
  File.open(path, 'wb') { |path| path.puts data }
end