#!/usr/bin/env ruby
require File.join(File.dirname(__FILE__), "..", "lib", "gitauth")

GitAuth::Application.processing(ARGV) do |a|
  a.banner = "GitAuth v#{GitAuth.version}"
  
  a.generator!
  
  a.option(:force, "force the creation of the settings file")
  a.option(:admin, "pass the path to a ssh public key and it adds a default admin user")
  a.add("install", "Sets up GitAuth for the current user") do |options|
    
    setup_generator ".", :silent => true
    
    # Check for a valid admin key
    if options.has_key?(:admin) && (!options[:admin].is_a?(String) || !file?(options[:admin]))
      puts "You provided the admin option but didn't provide it with a path to public key."
      die! "Please re-run again with a path to a key, e.g. --admin=~/id_rsa.pub"
    end
    
    if !yes?("Are you logged in as the correct user?")
      die!("Please log in as the correct user and re-run") 
    end

    if !GitAuth.has_git?
      die!("'git' was not found in your path - please install it / add it to your path before continuing.")
    end

    ssh_folder = "~/.ssh"
    if !folder?(ssh_folder)
      folders ssh_folder
      chmod 0700, ssh_folder
    end

    authorized_keys = ssh_folder / "authorized_keys"
    if !file?(authorized_keys)
      file authorized_keys, "\n\n## GitAuth - DO NO EDIT BELOW THIS LINE ##\n"
      chmod 0600, authorized_keys
    end

    gitauth_folder = "~/.gitauth/"
    folders gitauth_folder

    settings_file = gitauth_folder / "settings.yml"
    if !file?(settings_file) || options[:force]
      repo_path = ask("Where did you want repositories to be stored?", "~/repositories")
      repo_path = File.expand_path(repo_path)
      folders repo_path

      default_shell_path = GitAuth::BASE_DIR.join("bin", "gitauth-shell").to_s
      gitauth_shell_path = ""
      gitauth_shell_set  = false
      while gitauth_shell_path.blank? || !(file?(gitauth_shell_path) && executable?(gitauth_shell_path))
        # A Give the user a message if the path doesn't exist.
        if gitauth_shell_set
          puts "The shell you provided, #{gitauth_shell_path}, isn't executable"
        else
          gitauth_shell_set = true
        end
        gitauth_shell_path = ask("What is the path to your gitauth-shell?", default_shell_path)
        gitauth_shell_path = File.expand_path(gitauth_shell_path)
      end

      GitAuth::Settings.update!({
        :base_path            => File.expand_path(repo_path),
        :authorized_keys_file => File.expand_path(authorized_keys),
        :shell_executable     => File.expand_path(gitauth_shell_path)
      })
    end

    if options[:admin]
      key_contents = File.read(options[:admin]).strip
      if GitAuth::User.create("admin", true, key_contents)
        puts "Default admin user added with key '#{options[:admin]}'"
      else
        die! "Error adding default admin user with key at '#{options[:admin]}'"
      end
    end
    
  end

  a.controller!(:web_app, "Starts the gitauth frontend using the default sintra runner", :skip_path => true)
  
  a.option(:force, "Skip the verification / confirmation part of adding the permissions")
  a.option(:type, "The type of permissions - one of all, read, write or none. Defaults to all")
  full_desc = "Gives a specific user or group the specified permissions to a given repository"
  a.add("permissions REPOSITORY USER-OR-GROUP", full_desc) do |repo, target, options|
    GitAuth.prepare
    permissions = options[:type] || 'all'
    
    if !%w(all read write none).include? permissions
      die! "'#{permissions}' is not a valid permission type. It must be all, read, write or none"
    end
    
    real_permissions = ({"all" => ["read", "write"], "none" => []}[permissions] || [permissions])
    repository       = GitAuth::Repo.get(repo)
    real_target      = GitAuth.get_user_or_group(target)
    
    die! "Unknown repository '#{repo}'"      if repository.blank?
    die! "Unknown user or group '#{target}'" if real_target.blank?
    
    if options[:force] || yes?("Adding '#{permissions}' permissions for #{real_target} to #{repository.name}")
      repository.update_permissions!(real_target, real_permissions)
      puts "Permissions updated."
    else
      puts "Permissions not added, exiting."
    end
  end
    
  a.option(:admin, "Makes a user an admin user")
  a.add("add-user NAME PATH-TO-PUBLIC-KEY", "Creates a user with a given public key") do |name, ssh_key, options|
    GitAuth.prepare
    die! "'#{ssh_key}' is not a valid path to a public key" if !File.file?(ssh_key)
    admin = !!options[:admin]
    contents = File.read(ssh_key).strip
    if GitAuth::User.create(name, admin, contents)
      puts "Successfully added user '#{name}' (user #{admin ? 'is' : 'is not'} an admin)"
    else
      die! "There was an unknown error attempting to add a user called '#{name}'"
    end
  end
  
  a.option(:make_empty, "Initializes the repository to be empty / have an initial blank commit")
  a.add("add-repo NAME [PATH=NAME]", "Creates a named repository, with an optional path on the file system") do |name, *args|
    GitAuth.prepare
    options = args.extract_options!
    path = (args.shift || name)
    if (repo = GitAuth::Repo.create(name, path))
      puts "Successfully created repository '#{name}' located at '#{path}'"
      if options[:make_empty]
        puts "Attempting to make empty repository"
        repo.make_empty!
      end
    else
      die! "Unable to create repository '#{name}' in location '#{path}'"
    end
  end
  
  a.add("add-group NAME", "Creates a group with a given name") do |name, options|
    GitAuth.prepare
    if GitAuth::Group.create(name)
      puts "Successfully created group '#{name}'"
    else
      die! "Unable to create group '#{name}'"
    end
  end
  
  a.add("ls-users", "Lists all users currently managed by gitauth") do |options|
    GitAuth.prepare
    puts "Users:"
    (GitAuth::User.all || []).each do |user|
      line = "- #{user}"
      line << " (admin)" if user.admin?
      puts line
    end
  end
  
  a.add("ls-repos", "Lists all repositories currently managed by gitauth") do |options|
    GitAuth.prepare
    puts "Repositories:"
    (GitAuth::Repo.all || []).each do |repo|
      line = " - #{repo.name}"
      line << " (#{repo.path})" if repo.path != repo.name
      puts line
    end
  end
  
  a.add("ls-groups", "Lists all groups currently managed by gitauth") do |options|
    GitAuth.prepare
    puts "Groups:"
    (GitAuth::Group.all || []).each do |group|
      puts "- #{group} (#{group.members.empty? ? "no members" : group.members.join(", ")})"
    end
  end
  
  a.add("rm-user NAME", "Removes the specified user") do |name, options|
    GitAuth.prepare
    user = GitAuth::User.get(name)
    die! "Unknown user '#{name}'" if user.blank?
    user.destroy!
    puts "Removed user '#{name}' - Please note you will manually need to remove this users line from authorized_keys"
  end
  
  a.add("rm-repo NAME", "Removes the specified repo") do |name, options|
    GitAuth.prepare
    repo = GitAuth::Repo.get(name)
    die! "Unknown repo '#{name}'" if repo.blank?
    repo.destroy!
    puts "Removed repo '#{name}'"
  end
  
  a.add("rm-group NAME", "Removes the specified group") do |name, options|
    GitAuth.prepare
    group = GitAuth::Group.get(name)
    die! "Unknown group '#{name}'" if group.blank?
    group.destroy!
    puts "Removed group '#{name}'"
  end
  
  a.add("usage", "Prints out the sample usage instructions") do |options|
    pager = nil
    if ENV.has_key?('PAGER')
      pager = ENV['PAGER'].blank? ? 'cat' : ENV['PAGER']
    else
      pager = "less"
    end
    exec "#{pager} '#{GitAuth::BASE_DIR.join("USAGE")}'"
  end
  
  a.add("show-repo NAME", "Shows information for a repository with a given name") do |name, options|
    GitAuth.prepare
    repo = GitAuth::Repo.get(name)
    die! "Unknown repository '#{repo}'" if repo.blank?
    puts "Repository Name: #{repo.name}"
    puts "Repository Path: #{repo.path}"
    puts "Actual Path:     #{repo.real_path}"
    puts "\nRead Permissions:"
    read_perms = repo.permissions.fetch(:read, [])
    read_perms.each { |item| puts "  - #{item}" }
    puts "  - No read permissions" if read_perms.blank?
    puts "\nWrite Permissions:"
    write_perms = repo.permissions.fetch(:write, [])
    write_perms.each { |item| puts "  - #{item}" }
    puts "  - No write permissions" if write_perms.blank?
  end
  
  a.add("show-group NAME", "Shows information for a group with a given name") do |name, options|
    GitAuth.prepare
    group = GitAuth::Group.get(name)
    die! "Unable to find a group named '#{name}'" if group.blank?
    puts "Group Name:     #{group.name}"
    puts "Reference Name: #{group.to_s}"
    puts "\nGroup Members:"
    group.members.each { |member| puts "  - #{member}" }
    puts "  - This group has no members" if group.members.blank?
  end
  
  a.add("show-user NAME", "Shows details for a user with a specific name") do |name, options|
    GitAuth.prepare
    user = GitAuth::User.get(name)
    die! "Unable to find a user named '#{name}'" if user.blank?
    puts "User Name: #{user.name}"
    groups = user.groups
    puts "\nGroups:"
    puts "  - This user isn't a member of any groups" if groups.blank?
    groups.each { |g| puts "  - #{g.to_s}" }
  end
  
end