init

.env.template

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+
+DB_USER=
+DB_PASSWORD=
+DB_HOST=
+DB_PORT=
+DB_NAME=
+
+SMTP_SERVER=
+SMTP_PORT=
+SMTP_USERNAME=
+SMTP_PASSWORD=
+
+HUGGINGFACE_API_TOKEN=

.gitignore

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+.env

Gemfile

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+source 'https://rubygems.org'
+
+gem 'pg'
+gem 'net-smtp'
+gem 'httparty'
+gem 'dotenv'
+gem 'erb'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    bigdecimal (3.1.9)
+    cgi (0.4.2)
+    csv (3.3.2)
+    dotenv (3.1.7)
+    erb (4.0.4)
+      cgi (>= 0.3.3)
+    httparty (0.22.0)
+      csv
+      mini_mime (>= 1.0.0)
+      multi_xml (>= 0.5.2)
+    mini_mime (1.1.5)
+    multi_xml (0.7.1)
+      bigdecimal (~> 3.1)
+    net-protocol (0.2.2)
+      timeout
+    net-smtp (0.5.1)
+      net-protocol
+    pg (1.5.9)
+    timeout (0.4.3)
+
+PLATFORMS
+  arm64-darwin-24
+  ruby
+
+DEPENDENCIES
+  dotenv
+  erb
+  httparty
+  net-smtp
+  pg
+
+BUNDLED WITH
+   2.6.2

mailer.rb

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+require 'bundler'
+Bundler.require(:default)
+
+require 'pg'
+require 'net/smtp'
+require 'httparty'
+require 'json'
+require 'dotenv'
+require 'erb'
+require 'date'
+require 'tempfile'
+
+
+# Load environment variables from.env file
+Dotenv.load
+
+DB_USER = ENV.fetch('DB_USER')
+DB_PASSWORD = ENV.fetch('DB_PASSWORD')
+DB_HOST = ENV.fetch('DB_HOST')
+DB_PORT = ENV.fetch('DB_PORT')
+DB_NAME = ENV.fetch('DB_NAME')
+
+SMTP_SERVER = ENV.fetch('SMTP_SERVER')
+SMTP_PORT = ENV.fetch('SMTP_PORT').to_i
+SMTP_USERNAME = ENV.fetch('SMTP_USERNAME')
+SMTP_PASSWORD = ENV.fetch('SMTP_PASSWORD')
+
+HUGGINGFACE_API_URL = 'https://router.huggingface.co/hf-inference/models/mistralai/Mixtral-8x7B-Instruct-v0.1/v1/chat/completions'
+HUGGINGFACE_API_TOKEN = ENV.fetch('HUGGINGFACE_API_TOKEN')
+
+MAIL_BODY_PROMPT = <<-END
+Analyze my recent weeks listening history and suggest a movie/comic character or celebrity that embodies the mood and spirit of my diverse music choices. Please keep the response concise and engaging, suitable for a marketing email.
+Here are the titles that were listened to this week
+
+END
+
+def fetch_titles_from_db()
+  one_week_ago = Date.today - 7
+  connection = PG.connect(:dbname => DB_NAME, :host => DB_HOST, :user => DB_USER, :password => DB_PASSWORD)
+
+  result = connection.exec_params("SELECT item_title FROM activities WHERE created_at >= $1 ORDER BY created_at DESC", [one_week_ago])
+  connection.close
+  results = []
+  results = result.map { |row| row['item_title']} if result.any?
+  return results
+end
+
+def generate_email_body(titles)
+  return "You didnt listen to any music this week :`(" unless titles
+
+  puts "Calling HF"
+  body = mistral_request_body(titles)
+  response = HTTParty.post(HUGGINGFACE_API_URL, headers: { 'Content-Type':'application/json','Authorization' => "Bearer #{HUGGINGFACE_API_TOKEN}" }, body: body)
+  JSON.parse(response.body)['choices'][0]['message']['content']
+end
+
+def mistral_request_body(titles)
+  formated_titles = titles.join(", ")
+  {
+    model: "mistralai/Mixtral-8x7B-Instruct-v0.1",
+    messages: [
+      {
+        role: "user",
+        content: "#{MAIL_BODY_PROMPT} #{formated_titles}"
+      }
+    ],
+    max_tokens: 1000,
+    stream: false
+  }.to_json
+end
+
+def send_email(to, subject, body)
+  current_time = Time.now.utc
+  formatted_time = current_time.strftime("%a, %-d %b %Y %H:%M:%S %z")
+
+  msg = <<-END
+Subject: #{subject}
+From: Weekly 1activity <#{SMTP_USERNAME}>
+To: #{to}
+Date: #{formatted_time}
+MIME-Version: 1.0
+Content-Type: text/html; charset=utf-8
+
+#{body}
+END
+
+  smtp = Net::SMTP.new(SMTP_SERVER, SMTP_PORT)
+  smtp.enable_starttls_auto
+  smtp.start do |server|
+    a = server.authenticate(SMTP_USERNAME, SMTP_PASSWORD)
+    puts a.string
+    begin
+    a= server.send_message(msg, SMTP_USERNAME, to)
+    puts a.string
+    rescue Net::SMTPFatalError => e
+      puts e.message
+    end
+  end
+end
+
+def main
+  titles = fetch_titles_from_db
+  total_plays = titles.length
+  body = generate_email_body(titles)
+  puts "HF done"
+  template = ERB.new File.read('./template/mail.html.erb')
+  html_body = template.result_with_hash({body: body, total_plays: total_plays})
+  title = "Weekly listening report #{Date.today}"
+  send_email("listening@sgui.de", title, html_body)
+  puts "Email sent with subject: #{title}"
+
+end
+
+main

template/mail.html.erb

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+<!DOCTYPE html>
+<html lang/en>
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Weekly listening report <%= Date.today.to_s %></title>
+  <style>
+    body { font-family: Arial, sans-serif; line-height: 1.5; margin: 0; padding: 0; }
+   .container { max-width: 600px; margin: auto; }
+   .header { background-color: #1DB954; color: #fff; padding: 20px; text-align: center; font-size: 24px; }
+   .content { padding: 20px; }
+    h1 { font-size: 32px; margin-top: 0; }
+    p { margin-bottom: 15px; }
+   .cta { background-color: #1DB954; border: none; border-radius: 5px; color: #fff; cursor: pointer; display: inline-block; font-size: 16px; padding: 10px 20px; text-decoration: none; }
+   .cta:hover { background-color: #1ED760; }
+   .footer { background-color: #f5f5f5; padding: 20px; text-align: center; font-size: 12px; color: #777; }
+   .footer a { color: #1DB954; text-decoration: none; }
+   .footer a:hover { text-decoration: underline; }
+    @media only screen and (max-width: 600px) {
+     .container { width: 100%; }
+     .header,.footer { text-align: left; }
+      h1 { font-size: 28px; }
+    }
+  </style>
+</head>
+<body>
+  <div class="container">
+    <div class="header">Your listening report for <%= Date.today.to_s %></div>
+    <div class="content">
+      <h1>Heyo!</h1>
+      <p>Total plays <%= total_plays %></p>
+      <p><%= body %></p>
+      <a href="#" class="cta">Listen Now</a>
+    </div>
+    <div class="footer"><a href="#">Unsubscribe</a> | <a href="#">Privacy Policy</a></div>
+  </div>
+</body>
+</html>