#!/usr/bin/env ruby
# Copyright (c) 2022 Yegor Bugayenko
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the 'Software'), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

STDOUT.sync = true

require 'slop'
require 'loog'
require 'octokit'
require 'nokogiri'
require 'backtrace'
require 'fileutils'
require 'obk'
require_relative '../lib/cobench/version'

loog = Loog::REGULAR

def config(path)
  f = File.expand_path(path)
  args = []
  args += File.readlines(f).map(&:strip) if File.exist?(f)
  args
end

args = config('~/.cobench') + config('.cobench') + ARGV

opts = Slop.parse(args, strict: true, help: true) do |o|
  o.banner = "Usage (#{Cobench::VERSION}): cobench [options]"
  o.bool '-h', '--help', 'Show these instructions'
  o.bool '--version', 'Show current version'
  o.bool '--verbose', 'Print as much log messages as possible'
  o.bool '--dry', 'Make no real round trips to GitHub'
  o.integer '--days', 'How many days to measure', default: 7
  o.string '--to', 'Directory where to save all files to', default: './cobench'
  o.string '--token', 'GitHub authentication token'
  o.array '--coder', 'GitHub nickname of a coder to track'
  o.array '--metrics', 'Names of metrics to use (all by default)'
  o.array '--include', 'Mask of GitHub repo to include, e.g. yegor256/*'
  o.array '--exclude', 'Mask of GitHub repo to exclude'
end

if opts.help? || opts[:coder].empty?
  puts opts
  exit
end

if opts.verbose?
  loog = Loog::VERBOSE
end

if opts.version?
  loog.info(Cobench::VERSION)
  exit
end

Encoding.default_external = Encoding::UTF_8
Encoding.default_internal = Encoding::UTF_8

data = {}

begin
  home = File.absolute_path(opts[:to])
  loog.debug("All files generated will be saved to #{home}")
  if File.exist?(home)
    loog.debug("Directory #{home} exists")
  else
    FileUtils.mkdir_p(home)
    loog.debug("Directory #{home} created")
  end
  if opts.token?
    api = Octokit::Client.new(:access_token => opts[:token])
  else
    api = Octokit::Client.new
    loog.warn("Connecting to GitHub without a token, this may lead to errors, use --token")
  end
  api.auto_paginate = true
  api = Obk.new(api, pause: 2000)
  loog.info("Reading GitHub data for the last #{opts[:days]} days")
  titles = {}
  opts[:coder].each do |u|
    user = u.downcase
    loog.info("Scanning #{user}...")
    data[user] = {}
    Dir[File.join(__dir__, '../lib/cobench/metrics/*.rb')].each do |f|
      name = File::basename(f).split('.')[0]
      if !opts[:metrics].empty? && !opts[:metrics].include?(name)
        loog.info("Ignoring #{user}/#{name} due to --metrics")
        next
      end
      type = "Cobench::#{name.capitalize}"
      loog.info("Reading #{user}/#{name}...")
      require_relative f
      m = type.split('::').reduce(Module, :const_get).new(api, user, opts)
      if opts.dry?
        measures = [
          { title: 'Issues', total: Random.new.rand(100), href: 'https://github.com/' },
          { title: 'Pulls', total: Random.new.rand(100), href: '' },
          { title: 'HoC', total: Random.new.rand(100), href: '' },
          { title: 'HoC', total: Random.new.rand(100), href: '' }
        ]
      else
        measures = m.take(loog)
      end
      measures.each do |d|
        before = 0
        before += data[user][d[:title]][:total] if data[user][d[:title]] != nil
        data[user][d[:title]] = { total: d[:total] + before, href: d[:href] }
        titles[d[:title]] = d[:title]
        loog.info("The value of #{user}/#{d[:title]} is #{d[:total]}")
      end
    end
  end
  data.each do |u, ms|
    score = ms.map do |t, h|
      h[:total] * if t == 'HoC'
        1
      elsif t == 'Pulls'
        100
      elsif t == 'Issues'
        50
      elsif t == 'Commits'
        5
      else
        raise "Unknown title '#{t}'"
      end
    end.inject(0, :+)
    data[u]['Score'] = { total: score, href: '' }
  end
  builder = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml|
    xml.cobench(time: Time.now, days: opts[:days]) do
      xml.titles do
        data.map { |_, ms| ms.keys }.flatten.each do |t|
          xml.title t
        end
      end
      xml.coders do
        data.each do |u, ms|
          xml.coder(id: u) do
            xml.metrics do
              ms.each do |k, v|
                xml.m(id: k, href: v[:href]) do
                  xml.text v[:total]
                end
              end
            end
          end
        end
      end
    end
  end
  index = File.join(home, 'index.xml')
  xml = builder.to_xml
  loog.debug(xml)
  File.write(index, xml)
  loog.debug("XML saved to #{index} (#{File.size(index)} bytes)")
  xslt = Nokogiri::XSLT(File.read(File.join(__dir__, '../assets/index.xsl')))
  html = xslt.transform(Nokogiri::XML(xml), 'version' => "'#{Cobench::VERSION}'")
  loog.debug(html)
  front = File.join(home, 'index.html')
  File.write(front, html)
  loog.debug("HTML saved to #{front} (#{File.size(front)} bytes)")
rescue StandardError => e
  loog.error(Backtrace.new(e))
  exit -1
end