# -*- encoding : utf-8 -*-

require 'spec_helper'
require 'email/receiver'

describe Email::Receiver do

  before do
    SiteSetting.reply_by_email_address = "reply+%{reply_key}@appmail.adventuretime.ooo"
    SiteSetting.email_in = false
    SiteSetting.title = "Discourse"
  end

  describe 'parse_body' do
    def test_parse_body(mail_string)
      Email::Receiver.new(nil).parse_body(Mail::Message.new mail_string)
    end

    it "raises EmptyEmailError if the message is blank" do
      expect { test_parse_body("") }.to raise_error(Email::Receiver::EmptyEmailError)
    end

    it "raises EmptyEmailError if the message is not an email" do
      expect { test_parse_body("asdf" * 30) }.to raise_error(Email::Receiver::EmptyEmailError)
    end

    it "raises EmptyEmailError if there is no reply content" do
      expect { test_parse_body(fixture_file("emails/no_content_reply.eml")) }.to raise_error(Email::Receiver::EmptyEmailError)
    end

    skip "raises EmailUnparsableError if the headers are corrupted" do
      expect { ; }.to raise_error(Email::Receiver::EmailUnparsableError)
    end

    it "can parse the html section" do
      test_parse_body(fixture_file("emails/html_only.eml")).should == "The EC2 instance - I've seen that there tends to be odd and " +
          "unrecommended settings on the Bitnami installs that I've checked out."
    end

    it "supports a Dutch reply" do
      test_parse_body(fixture_file("emails/dutch.eml")).should == "Dit is een antwoord in het Nederlands."
    end

    it "supports a Hebrew reply" do
      I18n.expects(:t).with('user_notifications.previous_discussion').returns('כלטוב')

      # The force_encoding call is only needed for the test - it is passed on fine to the cooked post
      test_parse_body(fixture_file("emails/hebrew.eml")).should == "שלום"
    end

    it "supports a BIG5-encoded reply" do
      I18n.expects(:t).with('user_notifications.previous_discussion').returns('媽！我上電視了！')

      # The force_encoding call is only needed for the test - it is passed on fine to the cooked post
      test_parse_body(fixture_file("emails/big5.eml")).should == "媽！我上電視了！"
    end

    it "removes 'via' lines if they match the site title" do
      SiteSetting.title = "Discourse"

      test_parse_body(fixture_file("emails/via_line.eml")).should == "Hello this email has content!"
    end

    it "removes an 'on date wrote' quoting line" do
      test_parse_body(fixture_file("emails/on_wrote.eml")).should == "Sure, all you need to do is frobnicate the foobar and you'll be all set!"
    end

    it "removes the 'Previous Discussion' marker" do
      test_parse_body(fixture_file("emails/previous.eml")).should == "This will not include the previous discussion that is present in this email."
    end

    it "handles multiple paragraphs" do
      test_parse_body(fixture_file("emails/paragraphs.eml")).
          should == (
"Is there any reason the *old* candy can't be be kept in silos while the new candy
is imported into *new* silos?

The thing about candy is it stays delicious for a long time -- we can just keep
it there without worrying about it too much, imo.

Thanks for listening."
      )
    end

    it "converts back to UTF-8 at the end" do
      result = test_parse_body(fixture_file("emails/big5.eml"))
      result.encoding.should == Encoding::UTF_8

      # should not throw
      TextCleaner.normalize_whitespaces(
          test_parse_body(fixture_file("emails/big5.eml"))
      )
    end
  end

  describe "posting replies" do
    let(:reply_key) { raise "Override this in a lower describe block" }
    let(:email_raw) { raise "Override this in a lower describe block" }
    # ----
    let(:receiver) { Email::Receiver.new(email_raw) }
    let(:post) { create_post }
    let(:topic) { post.topic }
    let(:posting_user) { post.user }
    let(:replying_user_email) { 'jake@adventuretime.ooo' }
    let(:replying_user) { Fabricate(:user, email: replying_user_email, trust_level: 2)}
    let(:email_log) { EmailLog.new(reply_key: reply_key,
                                   post: post,
                                   post_id: post.id,
                                   topic_id: post.topic_id,
                                   email_type: 'user_posted',
                                   user: replying_user,
                                   user_id: replying_user.id,
                                   to_address: replying_user_email
    ) }

    before do
      email_log.save
    end

    # === Success Posting ===

    describe "valid_reply.eml" do
      let!(:reply_key) { '59d8df8370b7e95c5a49fbf86aeb2c93' }
      let!(:email_raw) { fixture_file("emails/valid_reply.eml") }

      it "creates a post with the correct content" do
        start_count = topic.posts.count

        receiver.process

        topic.posts.count.should == (start_count + 1)
        created_post = topic.posts.last
        created_post.via_email.should == true
        created_post.cooked.strip.should == fixture_file("emails/valid_reply.cooked").strip
      end
    end

    describe "paragraphs.eml" do
      let!(:reply_key) { '59d8df8370b7e95c5a49fbf86aeb2c93' }
      let!(:email_raw) { fixture_file("emails/paragraphs.eml") }

      it "cooks multiple paragraphs with traditional Markdown linebreaks" do
        start_count = topic.posts.count

        receiver.process

        topic.posts.count.should == (start_count + 1)
        topic.posts.last.cooked.strip.should == fixture_file("emails/paragraphs.cooked").strip
        topic.posts.last.cooked.should_not match /<br/
      end
    end

    describe "attachment.eml" do
      let!(:reply_key) { '636ca428858779856c226bb145ef4fad' }
      let!(:email_raw) {
        fixture_file("emails/attachment.eml")
        .gsub("TO", "reply+#{reply_key}@appmail.adventuretime.ooo")
        .gsub("FROM", replying_user_email)
      }

      let(:upload_sha) { '04df605be528d03876685c52166d4b063aabb78a' }

      it "creates a post with an attachment" do
        start_count = topic.posts.count
        Upload.find_by(sha1: upload_sha).try :destroy

        receiver.process

        topic.posts.count.should == (start_count + 1)
        topic.posts.last.cooked.should match /<img src=['"](\/uploads\/default\/\d+\/\w{16}\.png)['"] width=['"]289['"] height=['"]126['"]>/
        Upload.find_by(sha1: upload_sha).should_not == nil
      end

    end

    # === Failure Conditions ===

    describe "too_short.eml" do
      let!(:reply_key) { '636ca428858779856c226bb145ef4fad' }
      let!(:email_raw) {
        fixture_file("emails/too_short.eml")
        .gsub("TO", "reply+#{reply_key}@appmail.adventuretime.ooo")
        .gsub("FROM", replying_user_email)
        .gsub("SUBJECT", "re: [Discourse Meta] eviltrout posted in 'Adventure Time Sux'")
      }

      it "raises an InvalidPost error" do
        SiteSetting.min_post_length = 5
        expect { receiver.process }.to raise_error(Email::Receiver::InvalidPost)
      end
    end

    describe "too_many_mentions.eml" do
      let!(:reply_key) { '636ca428858779856c226bb145ef4fad' }
      let!(:email_raw) { fixture_file("emails/too_many_mentions.eml") }

      it "raises an InvalidPost error" do
        SiteSetting.max_mentions_per_post = 10
        (1..11).each do |i|
          Fabricate(:user, username: "user#{i}").save
        end

        expect { receiver.process }.to raise_error(Email::Receiver::InvalidPost)
      end
    end

  end

  describe "posting a new topic" do
    let(:category_destination) { raise "Override this in a lower describe block" }
    let(:email_raw) { raise "Override this in a lower describe block" }
    let(:allow_strangers) { false }
    # ----
    let(:receiver) { Email::Receiver.new(email_raw) }
    let(:user_email) { 'jake@adventuretime.ooo' }
    let(:user) { Fabricate(:user, email: user_email, trust_level: 2)}
    let(:category) { Fabricate(:category, email_in: category_destination, email_in_allow_strangers: allow_strangers) }

    before do
      SiteSetting.email_in = true
      user.save
      category.save
    end

    describe "too_short.eml" do
      let!(:category_destination) { 'incoming+amazing@appmail.adventuretime.ooo' }
      let(:email_raw) {
        fixture_file("emails/too_short.eml")
        .gsub("TO", category_destination)
        .gsub("FROM", user_email)
        .gsub("SUBJECT", "A long subject that passes the checks")
      }

      it "does not create a topic if the post fails" do
        before_topic_count = Topic.count

        expect { receiver.process }.to raise_error(Email::Receiver::InvalidPost)

        Topic.count.should == before_topic_count
      end

    end

  end

  def fill_email(mail, from, to, body = nil, subject = nil)
    result = mail.gsub("FROM", from).gsub("TO", to)
    if body
      result.gsub!(/Hey.*/m, body)
    end
    if subject
      result.sub!(/We .*/, subject)
    end
    result
  end

  def process_email(opts)
    incoming_email = fixture_file("emails/valid_incoming.eml")
    email = fill_email(incoming_email, opts[:from],  opts[:to], opts[:body], opts[:subject])
    Email::Receiver.new(email).process
  end

  describe "with a valid email" do
    let(:reply_key) { "59d8df8370b7e95c5a49fbf86aeb2c93" }
    let(:to) { SiteSetting.reply_by_email_address.gsub("%{reply_key}", reply_key) }

    let(:valid_reply) {
      reply = fixture_file("emails/valid_reply.eml")
      to = SiteSetting.reply_by_email_address.gsub("%{reply_key}", reply_key)
      fill_email(reply, "test@test.com", to)
    }

    let(:receiver) { Email::Receiver.new(valid_reply) }
    let(:post) { create_post }
    let(:user) { post.user }
    let(:email_log) { EmailLog.new(reply_key: reply_key,
                                   post_id: post.id,
                                   topic_id: post.topic_id,
                                   user_id: post.user_id,
                                   post: post,
                                   user: user,
                                   email_type: 'test',
                                   to_address: 'test@test.com'
                                   ) }
    let(:reply_body) {
"I could not disagree more. I am obviously biased but adventure time is the
greatest show ever created. Everyone should watch it.

- Jake out" }

    describe "with an email log" do

      it "extracts data" do
        expect{ receiver.process }.to raise_error(Email::Receiver::EmailLogNotFound)

        email_log.save!
        receiver.process

        expect(receiver.body).to eq(reply_body)
        expect(receiver.email_log).to eq(email_log)
      end

    end

  end

  describe "processes an email to a category" do
    before do
      SiteSetting.email_in = true
    end


    it "correctly can target categories" do
      to = "some@email.com"

      Fabricate(:category, email_in_allow_strangers: false, email_in: to)
      SiteSetting.email_in_min_trust = TrustLevel[4].to_s

      # no email in for user
      expect{
        process_email(from: "cobb@dob.com", to: "invalid@address.com")
      }.to raise_error(Email::Receiver::BadDestinationAddress)

      # valid target invalid user
      expect{
        process_email(from: "cobb@dob.com", to: to)
      }.to raise_error(Email::Receiver::UserNotFoundError)

      # untrusted
      user = Fabricate(:user)
      expect{
        process_email(from: user.email, to: to)
      }.to raise_error(Email::Receiver::UserNotSufficientTrustLevelError)

      # trusted
      user.trust_level = 4
      user.save

      process_email(from: user.email, to: to)
      user.posts.count.should == 1

      # email too short
      message = nil
      begin
        process_email(from: user.email, to: to, body: "x", subject: "this is my new topic title")
      rescue Email::Receiver::InvalidPost => e
        message = e.message
      end

      e.message.should include("too short")
    end

  end


  describe "processes an unknown email sender to category" do
    before do
      SiteSetting.email_in = true
    end


    it "rejects anon email" do
      Fabricate(:category, email_in_allow_strangers: false, email_in: "bob@bob.com")
      expect { process_email(from: "test@test.com", to: "bob@bob.com") }.to raise_error(Email::Receiver::UserNotFoundError)
    end

    it "creates a topic for allowed category" do
      Fabricate(:category, email_in_allow_strangers: true, email_in: "bob@bob.com")
      process_email(from: "test@test.com", to: "bob@bob.com")

      # This is the current implementation but it is wrong, it should register an account
      Discourse.system_user.posts.order("id desc").limit(1).pluck(:raw).first.should include("Hey folks")

    end

  end

end