#!/usr/bin/env ruby
# encoding: UTF-8
#
# git-explore [-r ref] [-p path] [-l line[-line]]
#
#   Explore the given reference on the remote origin website
#
require 'rubygems'
require 'optparse'
require 'term/ansicolor'
require 'git-whistles/app'

class App < Git::Whistles::App

  GITHUB_URL = 'https://github.com'

  def main(args)
    super
    parse_args!(args)

    @origin = run!("git config --get remote.origin.url").strip

    unless github?
      die 'Unknown origin. Only github supported at the moment', usage: true
    end

    # This has to support both variants
    # https://github.com/mezis/git-whistles.git
    # git@github.com:mezis/git-whistles.git
    unless @origin.match /github\.com[:\/](.+)\.git/
      die "Error parsing #{@origin} could not find repo"
    end

    repo      = $1
    path      = options.path          ? "/#{ options.path.strip }" : nil
    reference = path                  ? "/blob/#{ options.ref.strip }" : "/tree/#{ options.ref.strip }"
    lines     = path && options.lines ? "##{options.lines.split('-').map{ |line| "L#{line}" }.join('-')}" : ''

    url = "#{GITHUB_URL}/#{repo}#{reference}#{path}#{lines}"

    puts "opening #{ url }..."
    run! "open #{ url }"
  end

  def defaults
    {
      ref:  run!('git rev-parse --abbrev-ref HEAD'),
      file: nil
    }
  end

  def option_parser
    @option_parser ||= OptionParser.new do |op|
      op.banner = "Usage: git explore [-r ref] [-p path] [-l line[-line]]"

      op.on('-r', '--ref REFERENCE', 'Reference to explore. Defaults to current branch') do |ref|
        options.ref = ref
      end

      op.on('-p', '--path PATH', 'Path to explore. Defaults to /') do |path|
        options.path = path
      end

      op.on('-l', '--line LINE', 'Line(s) to highlight. Examples: "2", "10-15". Defaults to nil') do |lines|
        options.lines = lines
      end

      op.on_tail('-h', '--help', 'Show this message') do
        puts op
        exit
      end
    end
  end

  private

  def github?
    @origin.match %r{github.com}
  end

end

App.run!