#-- encoding: UTF-8

#-- copyright
# OpenProject is an open source project management software.
# Copyright (C) 2012-2021 the OpenProject GmbH
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License version 3.
#
# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
# Copyright (C) 2006-2013 Jean-Philippe Lang
# Copyright (C) 2010-2013 the ChiliProject Team
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# See COPYRIGHT and LICENSE files for more details.
#++

namespace :redmine do
  namespace :email do
    desc <<~END_DESC
            Read an email from standard input.
      #{'      '}
            General options:
              unknown_user=ACTION      how to handle emails from an unknown user
                                       ACTION can be one of the following values:
                                       ignore: email is ignored (default)
                                       accept: accept as anonymous user
                                       create: create a user account
              no_permission_check=1    disable permission checking when receiving
                                       the email
      #{'      '}
            Issue attributes control options:
              project=PROJECT          identifier of the target project
              status=STATUS            name of the target status
              type=TYPE                name of the target type
              category=CATEGORY        name of the target category
              priority=PRIORITY        name of the target priority
              allow_override=ATTRS     allow email content to override attributes
                                       specified by previous options
                                       ATTRS is a comma separated list of attributes
      #{'      '}
            If you want to set default values for custom fields, set the value similar to
            the attributes above, using the name of the custom field as a key.
            Custom ields set this way can only contain characters valid for environment
            variables, i.e. no punctuation and no whitespace.
            Additionally, you need to set the list of the attributes set this way in the
            default_attributes list like this:
      #{'      '}
              default_attributes="CustomField1 CustomField2"
      #{'      '}
            Examples:
              # No project specified. Emails MUST contain the 'Project' keyword:
              rake redmine:email:read RAILS_ENV="production" < raw_email
      #{'      '}
              # Fixed project and default type specified, but emails can override
              # both type and priority attributes:
              rake redmine:email:read RAILS_ENV="production" \\
                              project=foo \\
                              type=bug \\
                              allow_override=type,priority < raw_email
    END_DESC

    task read: :environment do
      MailHandler.receive(STDIN.read, options_from_env)
    end

    desc <<~END_DESC
            Read emails from an IMAP server.
      #{'      '}
            General options:
              unknown_user=ACTION      how to handle emails from an unknown user
                                       ACTION can be one of the following values:
                                       ignore: email is ignored (default)
                                       accept: accept as anonymous user
                                       create: create a user account
              no_permission_check=1    disable permission checking when receiving
                                       the email
      #{'      '}
            Available IMAP options:
              host=HOST                IMAP server host (default: 127.0.0.1)
              port=PORT                IMAP server port (default: 143)
              ssl=SSL                  Use SSL? (default: false)
              username=USERNAME        IMAP account
              password=PASSWORD        IMAP password
              folder=FOLDER            IMAP folder to read (default: INBOX)
      #{'      '}
            Issue attributes control options:
              project=PROJECT          identifier of the target project
              status=STATUS            name of the target status
              type=TYPE                name of the target type
              category=CATEGORY        name of the target category
              priority=PRIORITY        name of the target priority
              allow_override=ATTRS     allow email content to override attributes
                                       specified by previous options
                                       ATTRS is a comma separated list of attributes
      #{'      '}
            If you want to set default values for custom fields, set the value similar to
            the attributes above, using the name of the custom field as a key.
            Custom ields set this way can only contain characters valid for environment
            variables, i.e. no punctuation and no whitespace.
            Additionally, you need to set the list of the attributes set this way in the
            default_attributes list like this:
      #{'      '}
              default_attributes="CustomField1 CustomField2"
      #{'      '}
            Processed emails control options:
              move_on_success=MAILBOX  move emails that were successfully received
                                       to MAILBOX instead of deleting them
              move_on_failure=MAILBOX  move emails that were ignored to MAILBOX
      #{'      '}
            Examples:
              # No project specified. Emails MUST contain the 'Project' keyword:
      #{'      '}
              rake redmine:email:receive_iamp RAILS_ENV="production" \\
                host=imap.foo.bar username=redmine@example.net password=xxx
      #{'      '}
      #{'      '}
              # Fixed project and default type specified, but emails can override
              # both type and priority attributes:
      #{'      '}
              rake redmine:email:receive_imap RAILS_ENV="production" \\
                host=imap.foo.bar username=redmine@example.net password=xxx ssl=1 \\
                project=foo \\
                type=bug \\
                allow_override=type,priority
    END_DESC

    task receive_imap: :environment do
      imap_options = { host: ENV['host'],
                       port: ENV['port'],
                       ssl: ENV['ssl'],
                       ssl_verification: !['0', 'false', 'f'].include?(ENV['ssl_verification']),
                       username: ENV['username'],
                       password: ENV['password'],
                       folder: ENV['folder'],
                       move_on_success: ENV['move_on_success'],
                       move_on_failure: ENV['move_on_failure'] }

      Redmine::IMAP.check(imap_options, options_from_env)
    end

    desc <<~END_DESC
            Read emails from an POP3 server.
      #{'      '}
            Available POP3 options:
              host=HOST                POP3 server host (default: 127.0.0.1)
              port=PORT                POP3 server port (default: 110)
              username=USERNAME        POP3 account
              password=PASSWORD        POP3 password
              apop=1                   use APOP authentication (default: false)
              delete_unprocessed=1     delete messages that could not be processed
                                       successfully from the server (default
                                       behaviour is to leave them on the server)
      #{'      '}
            See redmine:email:receive_imap for more options and examples.
    END_DESC

    task receive_pop3: :environment do
      pop_options = { host: ENV['host'],
                      port: ENV['port'],
                      apop: ENV['apop'],
                      username: ENV['username'],
                      password: ENV['password'],
                      delete_unprocessed: ENV['delete_unprocessed'] }

      Redmine::POP3.check(pop_options, options_from_env)
    end

    desc 'Send a test email to the user with the provided login name'
    task :test, [:login] => :environment do |_task, args|
      login = args[:login]
      if login.blank?
        abort I18n.t(:notice_email_error,
                     default: 'Please include the user login to test with. Example: redmine:email:test[example-login]')
      end

      user = User.find_by_login(login)
      unless user && user.logged?
        abort I18n.t(:notice_email_error, default: "User with login '#{login}' not found")
      end

      ActionMailer::Base.raise_delivery_errors = true

      begin
        UserMailer.test_mail(user).deliver_now
        puts I18n.t(:notice_email_sent, value: user.mail)
      rescue StandardError => e
        abort I18n.t(:notice_email_error, e.message)
      end
    end

    private

    def options_from_env
      { issue: {} }.tap do |options|
        default_fields = (ENV['default_fields'] || '').split
        default_fields |= %w[project status type category priority assigned_to version]
        default_fields.each { |field| options[:issue][field.to_sym] = ENV[field] if ENV[field] }

        options[:allow_override] = ENV['allow_override'] if ENV['allow_override']
        options[:unknown_user] = ENV['unknown_user'] if ENV['unknown_user']
        options[:no_permission_check] = ENV['no_permission_check'] if ENV['no_permission_check']
      end
    end
  end
end