Weather Forecast Client

Overview

This Java application acts as a client for a weather forecast system, allowing users to connect to a server via sockets. The application supports two types of users: admin and client.

• Admin can manage cities and weather forecasts (add, modify, or delete data).
• Client can request weather forecasts based on latitude and longitude.

Features

Admin Functionalities:

• Add a city (adauga_oras): Provides city details including ID, name, latitude, and longitude.
• Add a forecast (adauga_prognoza): Adds weather forecasts for four days for a specific city.
• Modify city details (modifica_oras): Updates an existing city's details.
• Modify a forecast (modifica_prognoza): Updates a weather forecast for a specific city and day.
• Delete a city (sterge): Removes a city and its associated forecasts.
• Exit (exit): Closes the admin session.

Client Functionalities:

• Request a weather forecast (primeste_prognoza): Retrieves weather information based on geographical coordinates.
• Exit (exit): Closes the client session.

Usage

1. Run the Java client.
2. Enter the user type (admin or client).
3. Follow the command prompts to interact with the server.

Database Setup

This application requires PostgreSQL to be installed and a database to be created following the required structure. Ensure you have PostgreSQL installed and set up the database accordingly before running the application.

Steps to Set Up the Database

1. Install PostgreSQL and start the database server.
2. Open the PostgreSQL command-line tool or a database management tool (e.g., pgAdmin).
3. Create a new database:

   CREATE DATABASE vreme;

4. Connect to the newly created database:

   \\c vreme;

5. Create the required tables:

   CREATE TABLE cities (
       id SERIAL PRIMARY KEY,
       nume VARCHAR(100) NOT NULL,
       latitudine DOUBLE PRECISION NOT NULL,
       longitudine DOUBLE PRECISION NOT NULL
   );
   
   CREATE TABLE forecasts (
       id SERIAL PRIMARY KEY,
       id_oras INT REFERENCES cities(id) ON DELETE CASCADE,
       ziua VARCHAR(50) NOT NULL,
       temperatura DOUBLE PRECISION NOT NULL,
       viteza_vantului DOUBLE PRECISION NOT NULL,
       umiditate INT NOT NULL,
       conditie_meteo VARCHAR(50) NOT NULL,
   );

6. Ensure that the database is properly configured and accessible from the Java application.

Validations

• City details validation: Ensures the correct format for city ID, latitude, and longitude.
• Weather forecast validation: Checks temperature, wind speed, and humidity values.
• Geographical coordinates validation: Ensures latitude and longitude are within valid ranges.

Requirements

• Java 8 or higher
• PostgreSQL installed and configured, user postgres password 1q2w3e, or you can change it in Server.jave file:

private static final String DB_URL = "jdbc:postgresql://localhost:5432/vreme";
    private static final String USER = "postgres";// your user
    private static final String PASS = "1q2w3e";//your password

• A running server listening on localhost:12345

Error Handling

• Handles socket connection issues gracefully.
• Validates input before sending it to the server.
• Displays appropriate error messages for invalid commands or incorrect data formats.