#!/usr/bin/env ruby
# encoding: utf-8
require File.dirname(__FILE__) + '/../lib/stagecoach.rb'

CONFIG_FILE = `pwd`.chomp + '/.stagecoach'

module Stagecoach
  staging = 'staging'
  master  = 'master'

  # Command line options courtesy of the Trollop gem.
  opts = CommandLine.trollop

  # Initial setup with -s flag.
  if opts[:setup]
    Config.setup
  end

  # Initial setup without -s flag.
  unless File.exist?(CONFIG_FILE)
    Config.setup
  end

  # Load config file to a hash.
  config = Config.yaml_to_hash

  # Checks validity of argument variables.
  # Ignore these checks with -t flag.
  unless opts[:testing_given] 
    Config.setup if config["redmine_site"] == "none"
    Config.setup if config["redmine_api"]  == "none"

    # Checks that command-line args are present and correct.
    Trollop::die :redmine, "issue number can only contain digits" if opts[:redmine] && opts[:redmine][/\D/]
    Trollop::die :github, "issue number can only contain digits" if opts[:github] && opts[:github][/\D/]
    Trollop::die :branch, "name must be longer than 1 character" if opts[:branch] && opts[:branch].length <= 1

    # You can't give a redmine and a github issue number (for the moment)
    if opts[:github] && opts[:redmine]
      puts "You can't enter a github issue at the same time as a redmine issue at the moment.  Make up your mind!\nExiting..."
      exit
    end
  end

  # Set up redmine client config.
  RedmineApi::Client.instance_eval do
    self.site = config["redmine_site"]
    self.user = config["redmine_api_key"]
  end

  # Checks for uncommitted/unstashed changes and aborts if present.
  if Git.changes != ''
    puts "You have uncommitted changes:".red
    puts Git.changes
    puts "Please commit or stash these changes before running Stagecoach. -h for help."
    puts "Exiting..."
    exit
  end 

  # ------------------------------------------------------------------
  # Initial stage - set up branch and git issue.
  # ------------------------------------------------------------------

  unless opts[:deploy] or opts[:push]

    # If no issue argument has been given.
    if opts[:github].nil? && opts[:redmine].nil?
      print "Are you working on a [R]edmine or a [G]ithub issue:  "
      case STDIN.gets.chomp
      when 'R'
        print "Please enter your Redmine issue number:  "
        opts[:redmine] = gets.chomp
      when 'G'
        print "Please enter your Github issue number:  "
        opts[:github] = gets.chomp
      end
    end

    # Check that the redmine issue is not already assigned.
    if opts[:redmine]
      redmine_issue_number = opts[:redmine]
      redmine_issue = Redmine.issue(redmine_issue_number)
      if redmine_issue.status.id != '1'
        puts "Warning!".red
        puts "This issue is in status '#{redmine_issue.status.name}'"
        begin 
          puts "It is assigned to #{redmine_issue.assigned_to.name}"
        rescue
          puts "But it is not assigned to anybody yet." 
        end
        print "Continue? [Y]es or [Q]uit:  "
        case STDIN.gets.chomp
        when 'Y'
        when 'Q'  
          exit
        end
      end

      # Set the redmine issue status to 'In Bearbeitung'
      redmine_issue.status_id = 2
      redmine_issue.save
    end

    # TODO: Check that the github issue is not already assigned.

    CommandLine.line_break
    puts "Stagecoach: initial stage"

    # Change to master, pull changes, and create a new branch.
    CommandLine.line_break  
    puts "Switching to master branch"
    #
    # TODO if there is a file that has been git added but not git committed, it
    # will pop up at this point looking confusing (eg. "A     test_file").
    # Handle this better?
    #
    Git.checkout(master)
    puts "Pulling changes:"
    Git.pull
    if opts[:branch_given]
      new_branch = opts[:branch]
    else  
      print "Please enter a new git branch name for your changes (branch will be created):  "
      new_branch = STDIN.gets.chomp
    end

    # Check that the new branch isn't master, because that would be silly
    case new_branch
    when 'master', 'Master' 
      puts "You can't use stagecoach to deploy your master branch.\nExiting..."
      exit
    end

    # Make sure new local branch does not already exist.
    if Git.branch_exist?(new_branch)
      puts "There is already a local branch called #{new_branch}."
      if Git.diff(master, new_branch) == ""
        print "#{new_branch} is up to date with master.  [U]se or [Q]uit:  "
      else 
        puts "#{new_branch} is not up to date with master. Please use a different branch or update this one.".red
        puts "Exiting..."
        CommandLine.line_break
        puts "The following files in branch '#{new_branch}' differ from their master branch versions:"
        puts Git.diff(master, new_branch)
        CommandLine.line_break
        exit
      end
      case STDIN.gets.chomp
      when 'U'
        Git.change_to_branch(new_branch)
      when 'Q'
        exit
      end
    else
      Git.new_branch(new_branch)
    end

    # Ugly code, pretty output...
    CommandLine.line_break

    # Issue handling.
    if opts[:github]
      config[Git.current_branch] = {:github_issue => opts[:github]}
      #TODO check that github issue is not assigned to somebody already
    elsif opts[:redmine]
      config[Git.current_branch] = {:redmine_issue => redmine_issue_number}
    end

    issue = config[Git.current_branch]

    # Set up the related issue for this branch.
    if redmine_issue = issue[:redmine_issue]
      begin
        puts "Searching for issue number #{redmine_issue}..."
        redmine_issue = Redmine.issue(redmine_issue)
      rescue ActiveResource::ResourceNotFound => e
        puts e.message
        exit
      end
      puts "Issue found: #{redmine_issue.subject}\n" 

      # Create a Github issue referencing the redmine issue.
      puts "Creating Git issue with subject: " + redmine_issue.subject
      body = "Redmine issue: #{Redmine.issue_url(redmine_issue)} \n\n #{redmine_issue.description}"

      # Create a Git issue.
      github_issue =  Git.new_issue(redmine_issue.subject, body)
      github_issue_id = github_issue[/\d+/]

      # Save it so we can reference it in commits using the magic of git hooks!
      config[Git.current_branch] = {:github_issue => github_issue_id, :redmine_issue => redmine_issue}

      print "Would you like to edit the issue on Github? [Y]es or anything else to continue:  "

      if STDIN.gets.chomp == 'Y'
        Git.view_issue(github_issue_id) 
      else
      end
    end

    # Github issues are easier.
    if issue[:github]
      #TODO what happens if no github issue is found?
      puts "Searching for github issue number #{issue[:number]}..."
      github_issue = Git.issue(issue[:number])
      puts "Issue found: #{github_issue} \n" 
    end

    # Saves the branch-specific details for later.
    Config.save(config)
    puts "Happy coding! Run stagecoach -d when you're ready to deploy."
  end

  # ------------------------------------------------------------------
  # Push stage
  # ------------------------------------------------------------------

  if opts[:push]
    # Get the current git branch
    branch = Git.current_branch

    # There's no point in pushing without any commits
    unless Git.branch_has_commits?(branch)
      puts "You don't have any uncommitted changes on branch #{branch}."
      puts "If you have already pushed your changes, run:"
      puts "stagecoach -d [deploy_branch]  - default is 'staging'"
      puts "Otherwise, go make some commits!"
      puts "#%s for help" % "stagecoach -h".green
      puts "Exiting..."
      exit
    end

    # You never know!  Display git status in case there are any nasty surprises.
    unless Git.status =~ /nothing to commit/
      CommandLine.line_break
      puts "You have a dirty git branch:\n".red
      puts Git.status
      CommandLine.line_break
      print "[P]ush anyway".red
      print " or "
      print "[anything else] to cancel:  ".green
      case STDIN.gets.chomp
      when "D"
        CommandLine.line_break
        puts "DEPLOYING:"
        CommandLine.line_break
      else 
        puts "Exiting..."
        exit
      end
    end

    # TODO this needs removing if we implement the 'deploy to staging' stuff
    # Stop anybody deploying master to staging...
    case branch
    when 'master', 'Master', 'staging', 'Staging' 
      puts "You can't use stagecoach to deploy your #{branch} branch.\nExiting..."
      exit
    end

    # Push the branch and give option to continue or quit
    Git.push(branch)

    puts "Push successful."  
    unless opts[:deploy_given]
      "stagecoach -d [branch_name] to deploy (default is staging)."
      "exiting..."
      exit
    end
  end

  # ------------------------------------------------------------------
  # Deploy stage.
  # ------------------------------------------------------------------

  if opts[:deploy_given]

    # Get the current git branch
    from_branch = Git.current_branch
    to_branch = opts[:deploy]

    Git.merge(to_branch, from_branch)
    Git.push(to_branch)
    Capistrano.deploy(to_branch)
    Git.change_to_branch(master)

    # Redmine issue to feedback status
    if redmine_issue_number =  config[branch][:redmine_issue]
      CommandLine.line_break
      puts "Attempting to change Redmine ticket status to 'Feedback' for you:"
      issue = Redmine.issue(redmine_issue_number)
      issue.status_id = 4
      issue.save
      Redmine.view_issue(issue)
    end
  end
end