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Overview of the Fertility Calculator Flask API

The script is a Flask-based API designed to calculate fertility dates. It starts by importing essential modules: Flask, request, and jsonify for web server functionality, datetime and timedelta for date calculations, and CORS from flask_cors to handle cross-origin requests—useful when the frontend and backend are on different domains.

App Setup

The Flask app is initialized with app = Flask(__name__), and CORS is enabled via CORS(app) to allow external client communication.

/calculate Endpoint

A POST endpoint, /calculate, is defined to process fertility calculations. When a POST request is received, the function extracts two values from the JSON body:

• cycle_length (integer): The length of the menstrual cycle.
• last_period (date string): The date of the last menstrual period.

Fertility Date Logic

Using the input:

• Ovulation Date = last_period + (cycle_length - 14)
• Fertile Window = Starts 5 days before ovulation, ends 4 days after

These dates are calculated using datetime operations.

Response Format

The API returns a JSON object with:

• ovulation_date
• fertile_window_start
• fertile_window_end
  All dates are in ISO string format.

Running the App

If the script is run directly, it launches the Flask server on 0.0.0.0:5002, making the API accessible from any IP on that port.