#!/usr/bin/env ruby
require 'optparse'
require 'pp'
require_relative 'version'

module GitHubChangelogGenerator
  class Parser
    def self.parse_options
      options = {:tag1 => nil, :tag2 => nil, :format => '%Y-%m-%d', :output => 'CHANGELOG.md', :labels => %w(bug enhancement), :pulls => true, :issues => true, :verbose => true, :add_issues_wo_labels => true, :merge_prefix => '*Merged pull-request:* ', :author => true, :pull_request_labels => nil, :filter_issues_by_milestone => true, :compare_link => true}

      parser = OptionParser.new { |opts|
        opts.banner = 'Usage: changelog_generator [options]'
        opts.on('-u', '--user [USER]', 'Username of the owner of target GitHub repo') do |last|
          options[:user] = last
        end
        opts.on('-p', '--project [PROJECT]', 'Name of project on GitHub') do |last|
          options[:project] = last
        end
        opts.on('-t', '--token [TOKEN]', 'To make more than 50 requests per hour your GitHub token required. You can generate it here: https://github.com/settings/tokens/new') do |last|
          options[:token] = last
        end
        opts.on('-f', '--date-format [FORMAT]', 'Date format. Default is %d/%m/%y') do |last|
          options[:format] = last
        end
        opts.on('-o', '--output [NAME]', 'Output file. Default is CHANGELOG.md') do |last|
          options[:output] = last
        end
        opts.on('--[no-]verbose', 'Run verbosely. Default is true') do |v|
          options[:verbose] = v
        end
        opts.on('--[no-]issues', 'Include closed issues to changelog. Default is true') do |v|
          options[:issues] = v
        end
        opts.on('--[no-]issues-wo-labels', 'Include closed issues without any labels to changelog. Default is true') do |v|
          options[:add_issues_wo_labels] = v
        end
        opts.on('--[no-]pull-requests', 'Include pull-requests to changelog. Default is true') do |v|
          options[:pulls] = v
        end
        opts.on('--[no-]filter-by-milestone', 'Use milestone to detect when issue was resolved. Default is true') do |last|
          options[:filter_issues_by_milestone] = last
        end
        opts.on('--[no-]author', 'Add author of pull-request in the end. Default is true') do |author|
          options[:last] = author
        end
        opts.on('--[no-]compare-link', 'Include compare link between older version and newer version. Default is true') do |v|
          options[:compare_link] = v
        end
        opts.on('--labels  x,y,z', Array, 'Issues with that labels will be included to changelog. Default is \'bug,enhancement\'') do |list|
          options[:labels] = list
        end
        opts.on('--labels-pr x,y,z', Array, 'Only pull requests with specified labels will be included to changelog. Default is nil') do |list|
          options[:pull_request_labels] = list
        end
        opts.on('--github-site [URL]', 'The Enterprise Github site on which your project is hosted.') do |last|
          options[:github_site] = last
        end
        opts.on('--github-api [URL]', 'The enterprise endpoint to use for your Github API.') do |last|
          options[:github_endpoint] = last
        end
        opts.on('-v', '--version', 'Print version number') do |v|
          puts "Version: #{GitHubChangelogGenerator::VERSION}"
          exit
        end
        opts.on('-h', '--help', 'Displays Help') do
          puts opts
          exit
        end
      }

      parser.parse!

      if ARGV[0] && !ARGV[1]
        github_site = options[:github_site] ? options[:github_site] : 'github.com'
        # this match should parse  strings such "https://github.com/skywinder/Github-Changelog-Generator" or "skywinder/Github-Changelog-Generator" to user and name
        match = /(?:.+#{Regexp.escape(github_site)}\/)?(.+)\/(.+)/.match(ARGV[0])

        begin
        param = match[2].nil?
        rescue
          puts "Can't detect user and name from first parameter: '#{ARGV[0]}' -> exit'"
          exit
        end
        if param
          exit
        else
          options[:user] = match[1]
          options[:project]= match[2]
        end


      end

      if !options[:user] && !options[:project]
        remote = `git remote -vv`.split("\n")
        match = /.*(?:[:\/])((?:-|\w|\.)*)\/((?:-|\w|\.)*)?(?:\.git).*/.match(remote[0])

        if match && match[1] && match[2]
          puts "Detected user:#{match[1]}, project:#{match[2]}"
          options[:user], options[:project] = match[1], match[2]
        end
      end


      if !options[:user] || !options[:project]
        puts parser.banner
        exit
      end

      if ARGV[1]
        options[:tag1] = ARGV[0]
        options[:tag2] = ARGV[1]
      end

      options
    end
  end
end