#!/usr/bin/env ruby
# frozen_string_literal: true

require 'colorize'
require 'json'

# Ciu, short for CanIUse
# A shell script that downloads JSON data and displays results
# in table form with colors
module Ciu
  MAX_AGE   = 86_400 # 1 day in seconds
  STATUSSES = { 'rec' => 'rc', 'unoff' => 'un', 'other' => 'ot' }.freeze
  COL       = '   '.freeze
  VER_BACK  = 2
  FETCH_URL = 'https://raw.githubusercontent.com/Fyrd/caniuse/master/data.json'.freeze
  STAT_SYMS = { 'n' => '-', 'y' => '+', 'p' => '~' }.freeze
  LIST      = %w[ie edge safari ios_saf opera
                 op_mob firefox chrome android bb].freeze
  NAMES     = { 'firefox' => 'ff', 'chrome' => 'chr', 'safari' => 'saf',
                'ios_saf' => 'saf_ios', 'opera' => 'opr', 'op_mob' => 'opr_mob',
                'android' => 'andr' }.freeze

  def self.features
    data
  end

  def self.row(ft)
    [
      status(ft['status']).green,
      support(ft['usage_perc_y']).light_black,
      title(ft['title']),
      stats(ft['stats']).light_black
    ].join(COL).bold
  end

  def self.title(str, maxw = 30, fill = '...')
    return str[0..(maxw - fill.size - 1)] + fill if str.size >= maxw
    str + (' ' * (maxw - str.size))
  end

  def self.status(status)
    '[' + (STATUSSES[status] || status) + ']'
  end

  def self.support(percentage)
    (percentage.to_s + '%').ljust(6)
  end

  def self.stats(stats)
    LIST.map do |browser|
      stats[browser].values.last(VER_BACK)
                    .map { |ypn| STAT_SYMS.fetch ypn, '-' }
                    .join + (NAMES[browser] || browser)
    end.join COL
  end

  def self.data
    @data ||= begin
      path = File.expand_path '~/.caniuse-fzf-data'
      exists = File.exist? path
      update = exists && File.mtime(path).to_i < Time.now.to_i - MAX_AGE

      exists && !update ? File.read(path) : download!
    end
  end

  def self.download!
    path = File.expand_path '~/.caniuse-fzf-data'
    json = JSON.parse `curl --silent #{FETCH_URL}`
    data = json['data'].values.map(&method(:row)).join "\n"

    File.open(path, 'w') { |f| f.write data }
    data
  end
end

puts Ciu.features