require 'rails_helper'

RSpec.describe LeadmailDelivery do
  let(:settings) do
    {
      api_url: 'https://mail.leadmagnet.dev/api/v1',
      token: 'lm_test_token_123'
    }
  end

  let(:delivery) { described_class.new(settings) }

  let(:message) do
    Mail.new do
      from 'sender@example.com'
      to 'recipient@example.com'
      subject 'Test Subject'
      body 'Plain text body'
    end
  end

  describe '#deliver!' do
    it 'sends email via LeadMail API' do
      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .with(
          headers: { 'Authorization' => 'Bearer lm_test_token_123' },
          body: hash_including(
            subject: 'Test Subject',
            from: { email: 'sender@example.com' },
            to: [{ email: 'recipient@example.com' }]
          )
        )
        .to_return(
          status: 202,
          body: { success: true, data: { log_id: 12345, status: 'queued' } }.to_json
        )

      delivery.deliver!(message)

      expect(message.header['X-LeadMail-Log-ID'].value).to eq('12345')
    end

    it 'handles multipart messages (HTML + text)' do
      html_message = Mail.new do
        from 'sender@example.com'
        to 'recipient@example.com'
        subject 'HTML Email'

        text_part do
          body 'Plain text version'
        end

        html_part do
          content_type 'text/html; charset=UTF-8'
          body '<h1>HTML version</h1>'
        end
      end

      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_return(
          status: 202,
          body: { success: true, data: { log_id: 12346, status: 'queued' } }.to_json
        )

      delivery.deliver!(html_message)

      expect(a_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .with { |req| body_hash = JSON.parse(req.body); body_hash['text_body'] == 'Plain text version' && body_hash['html_body'] == '<h1>HTML version</h1>' })
        .to have_been_made
    end

    it 'includes CC and BCC recipients' do
      message_with_cc = Mail.new do
        from 'sender@example.com'
        to 'recipient@example.com'
        cc 'cc@example.com'
        bcc 'bcc@example.com'
        subject 'With CC/BCC'
        body 'Test'
      end

      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_return(
          status: 202,
          body: { success: true, data: { log_id: 12347, status: 'queued' } }.to_json
        )

      delivery.deliver!(message_with_cc)

      expect(a_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .with { |req| body_hash = JSON.parse(req.body); body_hash['cc'] == [{ 'email' => 'cc@example.com' }] && body_hash['bcc'] == [{ 'email' => 'bcc@example.com' }] })
        .to have_been_made
    end

    it 'handles reply-to header' do
      message_with_reply = Mail.new do
        from 'sender@example.com'
        to 'recipient@example.com'
        reply_to 'reply@example.com'
        subject 'With Reply-To'
        body 'Test'
      end

      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_return(
          status: 202,
          body: { success: true, data: { log_id: 12348, status: 'queued' } }.to_json
        )

      delivery.deliver!(message_with_reply)

      expect(a_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .with { |req| body_hash = JSON.parse(req.body); body_hash['reply_to'] == { 'email' => 'reply@example.com' } })
        .to have_been_made
    end

    it 'encodes attachments in base64' do
      message_with_attachment = Mail.new do
        from 'sender@example.com'
        to 'recipient@example.com'
        subject 'With Attachment'
        body 'Test'
        add_file filename: 'test.txt', content: 'File content'
      end

      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_return(
          status: 202,
          body: { success: true, data: { log_id: 12349, status: 'queued' } }.to_json
        )

      delivery.deliver!(message_with_attachment)

      expect(a_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .with { |req| body_hash = JSON.parse(req.body); body_hash['attachments'].first['content'].present? })
        .to have_been_made
    end

    it 'raises LeadmailDeliveryError on API failure' do
      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_return(status: 500, body: 'Internal Server Error')

      expect { delivery.deliver!(message) }
        .to raise_error(LeadmailDeliveryError, /LeadMail API error: 500/)
    end

    it 'sets default options for verification and disposable emails' do
      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_return(
          status: 202,
          body: { success: true, data: { log_id: 12350, status: 'queued' } }.to_json
        )

      delivery.deliver!(message)

      expect(a_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .with { |req| body_hash = JSON.parse(req.body); body_hash['options']['on_verification_failure'] == 'strip' && body_hash['options']['allow_disposable'] == false })
        .to have_been_made
    end

    it 'logs successful delivery' do
      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_return(
          status: 202,
          body: { success: true, data: { log_id: 12351, status: 'queued' } }.to_json
        )

      expect(Rails.logger).to receive(:info).with(match(/Email sent via LeadMail.*log_id=12351/))
      delivery.deliver!(message)
    end

    it 'logs delivery errors' do
      stub_request(:post, 'https://mail.leadmagnet.dev/api/v1/emails/send')
        .to_raise(StandardError.new('Network error'))

      expect(Rails.logger).to receive(:error).with(match(/LeadMail delivery failed/))
      expect { delivery.deliver!(message) }.to raise_error(StandardError)
    end
  end
end