import java.util.Base64;

/**
 * A class representing a user in the system.
 * <p>
 * A user has an id, a type, a name, and a password.
 * The id is a unique identifier (string) for the user.
 * The type can be either ADMIN or PUBLIC.
 * The name and password are stored as base64-encoded strings.
 *
 * @author Yuri Tatishchev
 * @version 0.1 2025-02-24
 */
public class User {
    public enum Type {
        ADMIN,
        PUBLIC,
    }

    private String id;
    private Type type;
    private String name;
    private String password;

    public User(String id, Type type, String name, String password) {
        this.id = id;
        this.type = type;
        this.name = name;
        this.password = password;
    }

    /**
     * Parse a User object from a CSV string.
     *
     * @param line The CSV string, should be in the format:
     *             <code>id,type,base64(name),base64(password)</code>.
     *             with escaped backslashes and commas.
     * @return a User object
     */
    public static User fromCsvString(String line) {
        String[] parts = line.split(",");
        String id = parts[0];
        Type type = Type.valueOf(parts[1]);
        String name = new String(Base64.getDecoder().decode(parts[2]));
        String password = new String(Base64.getDecoder().decode(parts[3]));
        return new User(id, type, name, password);
    }

    /**
     * Get a CSV formatted string from the user object.
     *
     * @return a CSV formatted string in the format:
     * <code>id,type,base64(name),base64(password)</code>.
     */
    public String toCsvString() {
        // don't forget to escape commas in name and password
        String csvName = Base64.getEncoder().encodeToString(name.getBytes());
        String csvPassword = Base64.getEncoder().encodeToString(password.getBytes());
        return String.join(",", id, type.toString(), csvName, csvPassword);
    }

    public Type getType() {
        return type;
    }

    public String getId() {
        return id;
    }

    public String getName() {
        return name;
    }

    public String getPassword() {
        return password;
    }

    /**
     * Check if the given password matches the user's password.
     *
     * @param password the inputted password to check
     * @return true if the password matches, false otherwise
     */
    public boolean checkPassword(String password) {
        return this.password.equals(password);
    }

    /**
     * Check if the user is an admin.
     *
     * @return true if the user is an admin, false otherwise
     */
    public boolean isAdmin() {
        return type == Type.ADMIN;
    }

}